FACULTAD DE INGENIERIA GEOLÓGICA Y METALÚRGICA
ESUELA PROFESIONAL DE INGENIERIA GEOLÓGICA
INFORME DE PRÁCTICA CARACTERIZACION ESTRUCTURAL DE MACIZO ROCOSO SALCEDO-TEPRO (ZONA 02)
CURSO: GEOMECANICA II – NIVELACION 2017 ESTUDIANTES:
CURASI MAMANI Henry Jhon LIMA VILCA Kenny HANCCO ARENAS Rushlin MASCO HUAYTA Wilson Elard JIMENEZ CHUCUYA Ivan Fernado CHOQUEAPAZA JIMENEZ Jesus ESCOBEDO PARY Abel VILLEGAS CASTILLO David
DOCENTE: Ing. CALLA FERNADEZ Fredy
Puno, c.u. Febrero del 2018
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
DEDICATORIA
Agradecemos Agradecemos a Dios por haberme dado la vida y conocimientosa todos del grupo.
Este presente informe les dedicamos nuestros padres, en especial al ingeniero Fredy Calla Fernandez y a todos del grupo por su esfuerzo, apoyo y compresión que nos tuvimos para realizar el informe.
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
INDICE DE CONTENIDO
RESUMEN:..................................................................................................... ..................................................................................................................... ................ 4 CAPITULO I: INTRODUCCION................................................ .......................................................................................... .......................................... 5 1.1
Objetivos: ................................................ ................................................................................................... ........................................................... ........ 5
CAPITULO II: CARACTERIZACION DEL AREA DE INVESTIGACION. ..................................... ..................................... 6 2.1. GENERALIDADES. .................................................................. .................................................................................................... .................................. 6 2.1.1. Ubicación: ................................................................................................................... 6 2.1.2. Accesibilidad: .............................................................................................................. 6 2.1.3. Aspectos climáticos: .................................................................................................... 7 2.1.3.2 Vegetación: ............................................................................................................... 7
2.1.4. LITOESTRATIGRAFIA. ................................................. ........................................................................................... .......................................... 8 2.1.41. GRUPO PUNO: ........................................................................................................... 8
CAPITULO III: MARCO TEORICO. .................................................. .................................................................................... .................................. 9 3.1. Marco conceptual. ............................................... .................................................................................................. ................................................... 9 CAPITULO IV: METODOLOGIA DE TRABAJO .................................................................. .................................................................. 10 4.1. Metodología: ............................................... .................................................................................................. ......................................................... ...... 10 CAPITULO V: EXPOSICION Y ANALISIS DE RESULTADOS. ............................................... ............................................... 23 5.1. CARACTERIZACIÓN DE LA MATRIZ ROCOSA. .................................................. .......................................................... ........ 23 5.2. CARACTERIZACION GEOMECÁNICA DEL MACIZO ROCOSO. .................................... 23 5.2.1. Toma de actitudes de las discontinuidades. ........................................................ ........ 23 5.2.2. Proyecciones estereográficas (elaboración manual). .................................................. .................................................... 23
5.2. RECOMENDACIONES: ........................................... ............................................................................................ ................................................. 25 REFERENCIAS BIBLIOGRAFICAS: ............................................................................. ................................................................................... ...... 25 ANEXOS:
........................ 26
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RESUMEN: En el presente trabajo se trata de realizar un análisis sobre el comportamiento geomecánico del macizo rocoso; así como el posible sobre-esfuerzo. Para ello se realizó una caracterización del macizo rocoso. Para lo cual fue necesario las salidas in situ, por lo cual se realizaron con la finalidad de tomar datos (toma de actitudes y caracterización) caracterización) para luego evaluar evaluar el macizo rocoso rocoso y posterior clasificación de la zona SALCEDO-TEPRO (zona 02).
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CAPITULO I: INTRODUCCION El capítulo presente intenta ser una aproximación a la caracterización del macizo rocoso r ocoso donde ha producido el colapso de la estructura. Esta caracterización ha incluido un estudio de campo de los materiales rocosos que han conducido a la elaboración de una clasificación geomecánica como base para el posterior análisis de otros parámetros, el estudio ha incluido asimismo un análisis de estabilidad mecánica del macizo con la aplicación de los criterios de los tests cinemáticos al uso para estos casos. Esta parte del trabajo bebe en gran medida en la difundida publicación de Hoek & Bray (1981) “Rock Slope Engineering”, de la que se han seguido en gran parte los criterios de análisis. Como complemento de la caracterización de la zona se incluye un pequeño inventario de taludes del entorno así como unas indicaciones sobre la durabilidad y meteorización al final del capítulo. Uno de los trabajos principales de este informe es caracterizar nuestro macizo rocoso para luego hacer el análisis de calidad de roca para cimentaciones, para lo cual nos proponemos las siguientes objetivos. 1.1 Objetivos: OBJETIVOS GENERALES:
Aprender a caracterizar el macizo rocoso en obras de cimentación.
Evaluar y calificar las condiciones naturales del macizo rocoso, y saber si es apto para las construcciones de obras civiles en cimentación.
OBJETIVOS ESPECIFICOS:
Levantamiento geotécnico del macizo, toma de datos de rumbo y buzamiento de las discontinuidades presentes en la zona de estudio.
Representación estereográfica de las discontinuidades en las falsillas de WULF y con software de DIPS.
Caracterización del macizo rocoso para par a posterior evaluación y clasificación.
Identificar los principales sistemas y familias de discontinuidades.
Hallar RMR, mediante los cálculos pertinentes, pertinentes, en función de los datos de campo,
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
CAPITULO II: CARACTERIZACION DEL AREA DE INVESTIGACION. 2.1. GENERALIDADES. 2.1.1. Ubicación:
Zona de estudio
Imagen 01: Nuestra área de estudio se encuentra ubicado al NE de la ciudad de Puno y a uno 50 metros aproximadamente del centro poblado de salcedo – Tepro, Tepro, con una altitud de 3810 m.s.n.m.
CUADRO N° 01: Ubicación Política UBICACIÓN POLITICA DEPARTAMENTO PROVINCIA DISTRITO SECTOR Fuente: Elaboración Propia CUADRO N° 02: Ubicación Geográfica ESTE NORTE 389 500 8 241 400 2.1.2. Accesibilidad:
Puno Puno puno SALCEDO-TEPRO
COTA 3810 m
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CUADRO N° 03: ACCESIBILIDAD MODO 1. TRAMO TIPO DE VIA Ciudad universitaria – Salcedo (Tepro)
Carretera asfaltada
DISTANCIA (m) 1500m
TIEMPO(Min) 20 min
2.1.3. Aspectos climáticos:
2.1.3.1 Temperatura: La Temperatura del Aire, promedio multianual durante el verano oscila alrededor de 10.5° y durante el invierno entre 8° y 9°C; durante estas temporadas, los valores promedios mensuales multianuales máximos y mínimos son alrededor de 16 .5°C y 0°C respectivamente; sin embargo, se han presentado temperaturas extremas de 20°C y mínimos absolutos de 3°C, aunque en su cercanía hacia la ciudad de Juliaca las temperaturas son inferiores a este valor.
2.1.3.2 Vegetación:
La vegetación de esta región es esteparia es esteparia y se caracteriza por las plantas de hojas de reducida superficie, evitando la pérdida excesiva de agua. En algunas especies, las hojas se han transformado en espinas, poseen una cutícula gruesa, y su color amarillento les da una apariencia de plantas secas. Protegidas del viento y del frío por matas de pasto, crecen algunas plantas con flores. con flores. También También hay arbustos enanos de profundas raíces. r aíces.
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2.1.4. LITOESTRATIGRAFIA. 2.1.41. GRUPO PUNO:
Gerthi (1915), describio por primera vez unas capas rojas de areniscas y conglomerados, que afloran al NW de la ciudad de puno. Fue Newell (1949) quien dio a esta unidad la categoría de grupo puno. Incluye una gruesa acumulación de sedimentos arcosicos de facies continentales, mal clasificados, los que se acumularon en cuencas de subsidencia rapida durnate el cretaceo superior y el terciario. El Grupo puede incluir dos o más unidades de distinta edad, pero solamente ha sido posible realizar una subdivisión informal durante el presente estudio. En términos generales, se encuentra constituido de conglomerados, areniscas, limonitas,
Imagen 03: aquí se observa el afloramiento del grupo puno.
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a) Espesor. Espesor. En la zona de estudio, el grosor del grupo puno es aproximadamente de 2000m., encontrándose en este cuadrángulo la sección tipo de este grupo, aflorando exactamente desde la localidad de ichu hasta salcedo y después en el cerro azoguini. b) Edad. Edad. Respecto a su posición lito estratigráfica, se le atribuye una edad paleógeno.calcáreos rojo pedregoso, como se observa en las Ladrilleras de Salcedo.
Imagen 04: en esta vista se observa todo el afloramiento del grupo puno.
CAPITULO III: MARCO TEORICO. 3.1. Marco conceptual. Es muy frecuentemente en los proyectos proyectos de obra civil o de edificación, la ingeniería ingeniería geológica
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Afloramiento: Afloramiento: Parte de un terreno visible en la superficie de la tierra. Deformación; Cuando se somete una muestra de roca a una carga esta tiende a cambiar de forma, de volumen o bien las dos cosas simultáneamente. Permeabilidad: Es la propiedad de algunos materiales de permitir el paso de fluidos a través de ellos. Porosidad: la porosidad es la relación entre el volumen ocupado por los huecos o poros en la roca. Rugosidad: El término se relaciona a la ondulación o sinuosidad (gran escala) y a la rugosidad (pequeña escala) y relacionado directamente con la resistencia al cizalle (corte) de la discontinuidad. La rugosidad aumenta la resistencia al cizalle de una discontinuidad. Abertura: Distancia perpendicular perpendicular que separa las paredes de la discontinuidad cuando cuando no existe relleno. Espaciado: es Espaciado: es la distancia media perpendicular entra los planos de discontinuidad de un misma familia. Continuidad:es Continuidad:es la extensión del plano de discontinuidad. Falla: Falla: Fractura del terreno con desplazamiento relativo de las partes separadas. Discontinuidad: Cualquier separación en el continuo de roca que posee nula resistencia a la tracción. CAPITULO IV: METODOLOGIA DE TRABAJO 4.1. Metodología: En el presente trabajo se utilizó la metodología campo-gabinete por lo cual lo dividimos en dos partes las cuales son: 4.1.2. Trabajo De Campo: En esta etapa de campo nos nos basamos en reconocimiento reconocimiento in-situ in-situ y en la verificación verificación de las condiciones físicas del área de estudio. Se hizo la evaluación geomecánica para determinar las
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Imagen 05: limpiado de la zona de estudio de donde se hará un fácil y rápido caracterización rocosa, de todas las discontinuidades presentes.
B) Segunda fase: caracterización del macizo rocoso Hallamos el RQD: con la ayuda de una wincha de 50 5 0 metros y un flexo procedimos a ver el grado de fracturamiento de la roca en un tramo.
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C) Tercera fase: toma de parámetros del macizo rocoso Aquí se prosigue a tomar los diferentes parámetros como alteración, rugosidad, persistencia.
Imagen 07: Aquí se observa la recolección de parámetros muy importantes para la
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Trabajo De Gabinete: Consistió en la recopilación y clasificación sistemática de la información de campo, evaluación de los resultados de los ensayos geotécnicos y análisis análisis de los los datos obtenidos en el el campo, campo, posterior interpretación de los resultados. En donde consiste en ploteo de los puntos puntos obtenidos en el campo en la falsilla de WULF, WULF, posterior interpretación. Así mismo se hizo el cálculo de la clasificación de la roca por la clasificación geomecánica propuesto por Bieniawsk (RMR), determinación determinación de RQD. Calculado por método de conteo de juntas por distancia. ENSAYO DE RESISTENCIA RESISTENCIA A LA COMPRESIÓN COMPRESIÓN SIMPLE En este caso no se pudo ir al laboratorio para hacer esta práctica ya que no se encuentra habilitado el laboratorio. Los datos en este caso no se obtuvo como ya se dijo solo tenemos el dato;dela fuerza con la que se sometió el ensayo.
Datos del testigo la que nos proporcionó por el docente.
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
Hallando i
σ1 =
F
π × r
σ1 = σ1 =
10 KgF 3.141 × (2. cm) 10KgF 1.4 cm
= .
Convirtiendo a Mega pascales MPa:
1 MPa 10.12
x 798.5768
KgF cm
= 78.3132 MPa
= .
CLASIFICACIÓN GEOMECÁNICA (RMR) El parámetro que define la clasificación es el denominado el índice RMR (Rock Masting Rating) Que indica la calidad del macizo rocoso en cada dominio estructural a partir de los siguientes
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El parámetro 6 que se refiere a la orientación de las discontinuidades respecto a la excavación.
El valor del RMR varía entre 0 a 100 resultado por la sumatoria de los valores numéricos que es asignado cada factor, de acuerdo a los rangos dados. La suma de los valores encontrados para los seis factores indicará el tipo o clase de macizo rocoso. r ocoso. RMR=A1+ A2+ A3+ A4+ A5+ B TRABAJO DE GABINETE Y RECOPILACIÓN DE DATOS PRIMER PARÁMETRO (A1): CUADRO No.01: RESISTENCIA DE LA ROCA SANA Entonces como la roca tiene una resistencia de 78.3132 MPa se clasifica como roca dura.
DESCRIPCIÓN Extremadamente Dura
RESISTENCIA A COMPRESIO NSIM NSIMPL PLEE M >250
ENSAYO DE CARGA PUN PUNTUAL TUAL MP MPaa >10
VALORACIÓN 15
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
c.) tramo 3:
RQD =
+22+0+20++11+340cm
112
= 1300 = 0.9015 =90.15%
1300cm
d.) Tramo 4:
RQD =
1+33+++221+1+3cm
10
= 1200 = 0.8875 = 88.75%
1200cm
e.) Tramo 5:
RQD =
42+11+1+11+40+4cm 00cm
44
= 00 = 0.93 = 93 %
Hallamos el RQD final promedio de os tramos trabajados en la zona 02. RQD=
. %+. %+. %+.%+% %+.%+%
RQD =
RQD = 88.07 % El valor obtenido en el proceso de determinación del RQD es comparado con la siguiente tabla: CUADRO No.02: VALORACIÓN DEL RQD
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
TERCER PARÁMETRO (A3): Clasificado según el cuadro que a continuación se observa: CUADRONo.03: SEPARACIÓN DE LAS DISCONTINUIDADES Descripción Espaciado de Tipo de las Macizo Muy separadas >2m. Solido Separadas 0.6 – 2m. Masivo Moderadamen 200 – 600mm. En Bloques te juntas Juntas 60 – 200mm Fracturado Muy Juntas <60 mm. Machacado
Valoración 20 15 10 8 5
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CUADRONo.6: RUGOSIDAD DE LAS DISCONTINUIDADES Grado Descripción 1 Muy rugosa 2 Rugosa 3 Ligeramente rugosa 4 Lisa 5 Plana(Espejo de
Valoración 6 5 3 1 0
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CUADRONo.8: ALTERACIÓN DE LAS DISCONTINUIDADES Grado Descripción 1 Descompuesta 2 Muy alterada 3 Moderadamente 4 Ligeramente alterada 5 No alterada
Valoraci 0 1 3 5 6
QUINTO PARÁMETRO (A5): PRESENCIA DEL AGUA. Para calcular la valoración según la presencia del agua se toma como referencia la tabla que a continuación se especifica.
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FINALMENTE REALIZAMOS LA SUMATORIA DE LA VALORACIÓN
RMR = A1 + A2 + A3 + A4 + A5 + B RMR = 7 + 20 + 15 + (1 + 0 + 3 + 4 + 3) + 15 -5 RMR = 68 - 5 RMR = 63 Por lo tanto el macizo rocoso tiene una valoración de 63 y se ubica en el rango entre 61 – 80 siendo 80 siendo clasificada Como una Roca BUENA CALIDAD DEL MACIZO ROCOSO CON RELACIÓN AL ÍNDICE RMR.-
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CIMENTACIONES SUPERFICIALES EN ROCA Método de Serrano y Olalla Serrano y Olalla plantean un método para la evaluación de capacidad portante de fundaciones superficiales en roca, en aquellos casos tanto en los que el medio rocoso es homogéneo e isótropo
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
CAPITULO V: EXPOSICION Y ANALISIS DE RESULTADOS. 5.1. CARACTERIZACIÓN DE LA MATRIZ ROCOSA.
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5.2.6. Diagrama de planos: Es este diagrama se presenta los polos y sus respectivos planos de las cuatro familias principales obtenidos en la falsillas de WULFF y en el programa de DIPS.
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UNIVERSIDAD NACIONAL DEL ALTIPLANO-PUNO INGENIERIA GEOLOGICA
CAPITULO VI CONCLUSIONES Y RECOMENDACIONES
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ANEXOS: 1. Croquis de la zona 02 de estudio SALCEDO ( tepro).
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