TUGAS SOAL LATIHAN MEKANIKA BATUAN DOSEN : JOKO APRIANTO, ST.
DIKERJAKAN OLEH :
BENNY PUTRA ARITONANG DBD 113 040
KEMENTRIAN RISET, TEKNOLOGI DAN PENDIDIKAN TINGGI UNIVERSITAS PALANGKA RAYA FAKULTAS TEKNIK JURUSAN TEKNIK PERTAMBANGAN 2016
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L!"#$ S%& M'($"( B!)$
1. Sebuah batuan batuan hasil pembora pemboran n memiliki memiliki dimensi dimensi diameter diameter 82 mm, mm, tinggi tinggi 169 mm, berat basah 21,42 N dan berat kering 20,31 N. Tentukan a. !era !eratt isi isi basah asah b. !erat isi kering ". #orositas 2. $ata $ata tab tabel el u%i u%i stre stress ss str strai ain n - pa
/a
/l
/
1,31 2,62 3,93 ,24 6, ,66 9,1 9,82
3202,2 032,02 6861,8 6,6 9149,13 1021, 12168,34 14181,1
612,24 1292,2 119,2 226, 328,98 3968,2 89,69 12131,2
19,2 2446,98 3823,31 3241,62 23,1 28 36,96 10081,9
3. !eberapa !eberapa alat alat u%i mekanika mekanika !atuan !atuan beserta "ara ker%an&a ker%an&a a. #oin #ointt 'o 'oad Test b. ()S ". Tria*ial d. !ra+ !ra+il illi lian an Test e. $ire $ire"t "t Shea Sheare re Test . Slak Slakee $ura $urabi bili lit& t&
1. S%& : Sebuah batuan hasil pemboran memiliki dimensi diameter 82 mm, tinggi 169 mm, berat basah 21,42 N dan berat kering 20,31 N. Tentukan d. !e t isi isi b ah
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P'$*'&'+"$ : d 82 mm 8,2 "m t 169 mm 16,9 "m
D"('! D"('!#) #)"" :
!erat basah 5n7 21,42 N 2183,49 2183,49 gram !erat kering 507 20,31 N 200,33 gram D"!$*
a7. !erat isi basah 5 γ b)
:
b7. !erat isi kering 5
γ
d)
"7. #orositas 5n7 J-$ :
14 . π .d2 .t 0,2 * 3,14 * 58,2 "m7 " m7 2 * 16,9 "m 0,2 * 3,14 * 6,24 "m 2 * 16,9 "m 892,04 "m 3
aka,
a7
γ
γ ¿
¿ Wn b ( Ww −Ws ) ¿ Wn
b
v
2183,49 gr 892,04 cm
¿
b7
γ
γ
3
2,44 gr/cm3
¿ W 0 d ( Ww −Ws ) 0 ¿ W 0
d
v
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¿ 2,32 gr / cm
3
"7 #oro #orosi sita tass 5n7 5n7 ( Wn −W 0 ) n ( Ww −Ws ) * 100: n
Wn −W 0 0 * 100 : v 2183,49 gr −2070,33 gr
n
892,04 cm 3 112,16 gr
n
892,042 cm 3 * 100:
n 12,68 :
3. B'B'-'/ '/ A&! A&! U" U" M'($" M'($"( ( B!)$ B!)$
* 100:
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5 strength77 dari per"onto batu Point load test dilakukan untuk mengukur kekuatan 5 strength se"ara tidak langsung di lapangan. Point Load Test Test atau pengu%ian titik beban merupakan substansi pengu%ian dari aktor kehadiran bidang lemah &ang mempengaruhi ke"epatan rambat gelombang ultrasonik dari suatu batuan 5spesimen batuan7. #er"ontoh batuan dapat berbentuk silinder. #eralatan &ang digunakan mudah diba;aba;a, tidak begitu besar dan "ukup ringan. ringan. #engu%ian #engu%ian "epat, "epat, sehingga sehingga dapat dapat diketahui diketahui kekuatan kekuatan !atuan dilapangan, dilapangan, sebelum pengu%ian dilaboratorium dilakukan. $ari pengu%ian ini didapat P
D
2
$imana arak antara dua konus penekan
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-" 18 C 23 ika
Alatalat &ang digunakan 17 esin pengu%ian point load test , untuk untuk meneka menekan n per"on per"onto to &ang &ang berben berbentuk tuk sili silind nder er,, balo balok k atau atau bent bentuk uk tida tidak k bera beratu tura ran n lain lainn& n&aa dari dari satu satu arah arah se"ar se"araa meneruskontinu hingga per"onto pe"ah. 27 istar, istar, untuk mengeta mengetahui hui %arak %arak perubahan perubahan a*ial a*ial antara antara dua konus konus penekan pada pada alat point alat point load. 37 Dial gauge, gauge, untuk untuk menguk mengukur ur beban beban maksim maksimum um &ang &ang dapat dapat diteri diterima ma "ontoh "ontoh batuan, hingga "ontoh tersebut pe"ah. pe"ah.
P%+')
17 )ontoh )ontoh batuan batuan &ang digunaka digunakan n dalam u%i u%i ini disiapkan disiapkan dengan dengan ukuran ukuran diameter diameter
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27 )ont )ontoh oh dile dileta takk kkan an dian dianta tara ra dua dua konu konuss pene peneka kan n alat alat point load , kemudi kemudian an dongkrak hidrolik diberikan tekanan sehingga kedua u%ung konus penekan tepat menekan permukaan "ontoh &ang akan diu%i. 37 )atat )atat ukuran ukuran mistar mistar penguku pengukuran ran pada a;al keduduk kedudukan an kedua kedua konus konus penekan penekan mulai menekan "ontoh. 47 #emberian #emberian tekanan tekanan dilakuk dilakukan an sedikit sedikit demi sedikit sedikit hingga hingga spe"imen spe"imen pe"ah. pe"ah. 7 #embeb #embebana anan n dihent dihentika ikan n setelah setelah spe"imen spe"imen mengalam mengalamii pe"ah pe"ah dan matika matikan n alat alat penekan apabila per"onto batuan sudah pe"ah. 67 !a"a !a"a %arum %arum penu penun% n%uk uk pembe pembeba bana nan n maks maksim imal al 5 dial gauge7 gauge7 &ang diberikan alat sehingga per"onto pe"ah. 7 )atat )atat ukuran ukuran mistar mistar pada akhir keduduk kedudukan, an, maka maka akan akan didapatk didapatkan an nilai nilai %arak %arak antara dua konus penekan.
)ontoh u%i berupa silinder atau irregular, diameter D 0 mm )ara u%i 1. )ontoh )ontoh diletak diletakkan kan pada pada alat alat u%i 2. 'akuka 'akukan n peneka penekanan nan hing hingga ga "onto "ontoh h pe"ah pe"ah 3.
D F = 0 I s
= F P D
2
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D
D
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P
#engu%ian ini dilakukan untuk mengetahui kekuatan 5 strength 7 dari per"ontoh batu se"ara tidak langsung dilapangan. #er"ontoh batuan dapat berbentuk silinder. #eralatan &ang digunakan mudah diba;aba;a, tidak begitu besar dan "ukup ringan.#en ringan.#engu%ian gu%ian "epat, sehingga sehingga dapat diketahui diketahui kekuatan kekuatan datuan dilapangan, dilapangan, sebelum pengu%ian dilaboratorium dilakukan.
D
$ari pengu%ian ini didapat
P D 2
$imana arak antara dua konus penekan ?ubungan antara inde* ranklin 5ika
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(>< B(AT T@BAN ( U!"FI#D !"$P%#&&I'# &T%#T) / U!& T#&T* Tu%ua Tu%uan n (ntuk (ntuk menent menentuka ukan n Unconfined !ompressi+e &trength (U!&*, -oungs $odulus, dan Poisson %atio )akupan Nilai U!& , -oungs $odulus, dan Poisson %atio #eralatan 1. esin esin tekan tekan E)on E)ontr trol olsE sE 2. $ial Fa Fauge 3. >an >angka gka Sor Soro ong 4. Stop;at"h
L$(# K' :
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6. #ompa #ompa dihidupkan dihidupkan,, sehingga sehingga oli &ang &ang bertekanan bertekanan tinggi tinggi akan akan masuk masuk kedalam kedalam silinder. #iston dalam silinder bergerak keba;ah sampai permukaan "ontoh batuan men&entuh plat tekan bagian atas. Barena kedua permukaan "ontoh batuan telah men&entuh plat tekan men&ebabkan kenaikan piston terhambat sehingga sehingga ga&a didalam "ontoh batuan meningkat. meningkat. !esarn&a ga&a &ang ada di dalam dalam "onto "ontoh h batu batuan an ini ini ditra ditrans nsmi misik sikan an ke s&ste s&stem m alat alat peng penguk ukur ur ga&a ga&a.. atikan pompa. . Atur Atur %arum %arum penun% penun%uk uk pada pada ketig ketigaa dial gauge pada gauge pada posisi nol 8. hidupkan hidupkan kembali kembali pompa pompa dan mulai mulai lakukan lakukan pemba"aan pemba"aan ga&a ga&a setiap interal interal 2 kN hingga ter%adi failure ter%adi failure dan dan di"atat proses pembebanan deormasi aksial dan lateraln&a. 9. Alat Alat pengukur pengukur ga&a ga&a terdiri terdiri dari dua buah %arum %arum penun%u penun%uk k &aitu %arum %arum hitam hitam dan %arum merah. >arum hitam menun%ukkan ga&a di dalam "ontoh batuan, sedangkan %arum merah di gerakkan oleh %arum hitam. !ila "ontoh batuan han"ur 5ailure7 ga&a di dalam "ontoh batuan berkurang, %arum hitam akan bergerak kembali ke nol dan %arum merah tertinggal pada skala terakhir &ang ditun%ukkan %arum hitam. aka ga&a maksimum &ang mampu ditahan oleh "ontoh batuan akan ditun%ukkan oleh %arum merah. mera h. 10. atikan motor motor dan "atat %uga laman&a ;aktu per"obaan. per"obaan. 'akukan 'akukan "ara &ang sam untuk "ontoh batuan &ang lain.
U" K)! T'($ U$"(+"& U5S
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1. K)! T'($ B!)$ 7
Tu%uan utama u%i kuat tekan uniaksial adalah untuk mendapatkan nilai kuat tekan dari "ontoh batuan. ?arga tegangan pada saat "ontoh batuan han"ur dideinisikan sebagai kuat tekan uniaksial batuan dan diberikan oleh hubungan -"
F A
Beterangan -" Buat tekan uniaksial batuan 5#a7 = Fa&a &ang beker%a pada saat "ontoh batuan han"ur han"ur 5kN7 A 'uas penampang a;al "ontoh batuan &ang tegak tegak lurus arah ga&a 5mm7
2. M%)&)+ Y%)$ E
odulu oduluss Goung atau modulu moduluss elastis elastisitas itas merupa merupakan kan aktor aktor penting penting dalam dalam mengealuasi mengealuasi deormasi batuan pada kondisi kondisi pembebanan pembebanan &ang berariasi. berariasi. odulus elastisitas dipengaruhi oleh tipe batuan, porositas, ukuran partikel, dan kandungan air. odulus elastisitas akan lebih besar nilain&a apabila diukur
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ke arah lateral 5lateral e*pansion7 akibat adan&a tegangan dalam arah aksial. Siat mekanik ini dapat ditentukan dengan persamaan
εl εa
Beterangan Nisbah #oisson J l regangan lateral 5:7 Ja regangan aksial 5:7 Tekan Tekan untuk untuk meneka menekan n sampel sampel batuan batuan dari dari satu arah arah 5unia* 5unia*ial7 ial7.. Nilai Nilai ()S merupa merupakan kan besar besar tekana tekanan n &ang &ang harus harus diberik diberikan an sehing sehingga ga membua membuatt batuan batuan pe"ah. Sedangkan point load inde* merupakan kekuatan batuan batuan lainn&a &ang &ang didapa didapatka tkan n dari dari u%i point point load. load. >ika >ika ()S memberika memberikan n tekana tekanan n pada pada permukaan sampel, pada u%i point load, sampel ditekan pada satu titik. (ntuk sampel dengan ukuran 0 mm, !ienia;ski mengusulkan hubungan antara nilai point load strength inde* 5
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UJI TRIAKSIAL (TRIAXIAL TEST)
Tu%uan utama u%i triaksial adalah untuk menentukan kekuatan batuan pada
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tekanan luida berungsi sebagai tekanan pemampatan 5- 37 &ang diberikan kepada "ontoh batuan. =luida dialirkan dengan menggunakan pompa hidraulik dan di%aga agar selalu konstan.
F(!%9F(!% *$ M'/'$)#" U" T"(+"& 1. T'($$ /'/!$
Tekanan Tekanan pemampatan merupakan aktor &ang sangat mempengaruhi dalam u%i triaks triaksial. ial. !esarn& !esarn&aa teganga tegangan n aksial aksial pada pada saat "ontoh "ontoh batuan batuan runtuh runtuh saat pengu%ian triaksial selalu lebih besar besa r daripada dar ipada tegangan aksial saat "ontoh batuan runtuh pada pengu%ian kuat tekan uniaksial. ?al ini disebabkan karena adan&a penekanan 5pemampatan7 dari arah lateral dari sekeliling "ontoh batuan pada u%i triaksial. !erbeda pada pengu%ian kuat tekan uniaksial, tekanan pemampatann&a adalah nol 5+ero "onining pressure7, sehingga tegangan aksial batuan lebih ke"il. !erdasarkan penelitian on Barman 519117 pada batuan marbel )arrara dapat dilihat dengan adan&a tekanan pemampatan pada "ontoh batuan mengakibatkan
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adalah brittle, brittle, tetapi pada temperatur temperatur 800 0) batuan hampir seluruhn&a du"tile. @ek temperatur terhadap tegangan dierensial saat runtuh untuk setiap tipe batuan adalah berbeda. #ada penelitian ini, pengaruh temperature diabaikan. 4. L) D';%+"
Benaikan la%u deormasi se"ara umum akan menaikkan kuat tekan batuan. ?al ?al ini ini terbu terbukt ktii dari dari pene penelit litian ianp pen eneli eliati atian an terda terdahu hulu lu.. #ada #ada tahu tahun n 1961 1961,, Serdenge"ti dan !oo+er melakukan penelitian tentang pengaruh kenaikan la%u deormasi pada u%i triaksial. $ari penelitian mereka pada batuan limestone dan gabbro solenhoen. !entuk !entuk "ontoh "ontoh batuan batuan pengu% pengu%ian ian triaks triaksial ial sama sama seperti seperti u%i kuat kuat tekan tekan unia*ial bentuk silinder. Semakin bertambahn&a ukuran "ontoh batuan, kemungkinan tiap "ontoh batuan dipengaruhi oleh bidang lemah akan semakin besar. Mleh karena itu, semakin besar "ontoh batuan &ang akan diu%i, kekuatan "ontoh batuan tersebut
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odel elastik ohr)oulomb digunakan karena simplisitasn&a, dimana pada model ini •
Tanah Tanah diasumsikan sebagai material mater ial elastik
•
Setelah tanah men"apai men"apai tegangan tegangan lelehn&a, tanah tidak memiliki plastic flo0 5artin&a flo0 5artin&a tidak ada hardening/softening 7 alias perfectl alias perfectl plastic
•
!haracteristi !haracteristicc state 5titik 5titik peruba perubahan han dari dari kondis kondisii kompre kompresi si ke dilasi7 dilasi7 ter%adi bersamaan dengan &ield dari tanah.
!atas plastis dari kriteria ohr)oulomb dengan persamaan berikut
(%i gese geserr triak triaksia siall adala adalah h u%i u%i &ang &ang pali paling ng dapa dapatt dian diandal dalka kan n untu untuk k menentukan
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Baret !an
L$(# K'
1. Funaka Funakan n saet& saet& glass glasses es dan dan saet& saet& shoe shoes. s. 2. )ontoh )ontoh batuan batuan &ang &ang digunakan digunakan berdimen berdimensi si pan%ang pan%ang dua kali kali diameter. diameter. 3. )ontoh )ontoh batuan batuan dimasukk dimasukkan an ke dalam dalam selubung selubung karet karet kemudi kemudian an ditutup ditutup kedua u%ungn&a dengan menggunakan plat, kemudian diletakkan kedalam sel triaksial dan ditutup. $idalam sel triaksial ini akan dipompakan oli bertekanan dari pompa hidrolik untuk memberikan tekanan pengukungan.
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10. !ila "ontoh batuan han"ur han"ur 5ailure7 &ang ditun%ukkan ditun%ukkan oleh %arum hitam &ang bergerak kembali ke nol, matikan motor dan "atat %uga laman&a ;aktu per"obaan. 11. 11. 'akukan 'akukan prosedur prosedur &ang sama untuk untuk "ontoh batuan ke2 dan ke3, tetapi dengan pengukungan &ang berbeda 5 *2 dan *37. D. U" K)! T T"( "( T( T( L$+)$ B<"&"$ B<"&"$ T'+ T'+! !
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1. Funaka Funakan n saet& saet& glass glasses es dan dan saet& saet& shoe shoess 2. Siapkan Siapkan ormulir ormulir data data %ika pengambilan pengambilan data dilakuk dilakukan an se"ara manual manual 3. Siap Siapka kan n "ont "ontoh oh batua batuan n deng dengan an ukur ukuran an dime dimens nsii pan% pan%an ang g seten setenga gah h kali kali diameter 5' $7 4. 'akuka 'akukan n persiap persiapan an mesin tekan. tekan. 'etakkan 'etakkan "ontoh "ontoh batuan batuan dipusa dipusatt antara antara plat atas dan plat ba;ah mesin tekan, dengan dinding silinder menempel pada plat atas dan plat plat ba;ah ba;ah dengan dengan terlebi terlebih h dahulu dahulu dilapi dilapisi si kertas kertas karbon karbon untuk untuk pemba"aan sudut . #asang dial gauge gauge untuk untuk mengukur mengukur deormasi deormasi aksial 6. ?idupk ?idupkan an mesin tekan tekan sehing sehingga ga "ontoh "ontoh batuan batuan men&e men&entu ntuh h plat tekan bagian bagian atas
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arah.#emeriksaandapatdilakukandengan single arah.#emeriksaandapatdilakukandengan single
shear
ataud ataudoule
shear .
#emeriksaandapatdibuatpadasemua%enistanahdanpada"ontohtanahasli 5undistru 5undistru77 atau atau"o "ont nto ohtan htanah ahti tida dak kasli asli
5distur7. distur7.
$ala $alamp mper erhi hitu tung ngan anm mekan ekanik ikat atan anah ah,,
kuatgeserinibiasadin&atakandengankohesi 5)7 dansudutgesekdalam 5K7.
PERALATAN
1. &hear De+ice 4 peralatan untuk memegang benda u%i se"ara kuat diantara 2
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. #eralat #eralatan an untuk untuk memadat memadatkan kan dan dan pen"eta pen"etakan kan kemba kembali li 5remolding 5 remolding 7 benda u%i. 8. !ontainer kaleng ke"il untuk pemeriksaan kadar air. 9. Displacement indicator untu untuk k mengu menguku kurr peru peruba baha han n teba teball band bandaa u%i dengan ketelitian 0,002 mm.
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5trimmer 7. 7 . $alam $alam pen& pen&ia iapa pan n bend bendaa u%i u%i untu untuk k "ont "ontoh oh tanah tanah asli asli &ang &ang sensiti harus lebih hatihati agar tidak merusak struktur aslin&a. Timbang berat benda u%i mulamula untuk mendapatkan kadar kadar air mulamula. 3. >ika >ika digu diguna naka kan n benda benda u%i u%i dari dari tanah tanah remolded , padatkan tanah dengan air sesu sesuai ai deng dengan an kond kondisi isi lapa lapang ngan an )ont )ontoh oh tanah tanah dapa dapatt lang langsu sung ng atau atau
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8. Setelah Setelah "ontoh "ontoh patah, patah, berikan berikan ga&a ga&a &ang &ang berla;an berla;anan an arah dengan dengan ga&a &ang sebelumn&a sampai tegangan gesern&a men"apai pun"ak 5kondisi residual7. 9. Sela Selama ma pemb pemberi erian an ga&a ga&a,, laku lakuka kan n pula pula pemb pemba" a"aan aan ga&a ga&a setia setiap p inte inter ral al
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Timbang masingmasing sampel batuan 'etakkan tiap sampel batuan pada dua mangkuk besi berbeda Beringkan tiap sampel batuan dalam oen bertemperatur 100D O selama D
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46 %am Beluarkan tiap sempel dari oen, kemudian dinginkan dalam desikator
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