Bab X Kuat Tekan BebasProyek: Praktikum Laboratorium Mekanika TanahLokasi: Laboratorium Mekanika Tanah Jurusan Teknik Sipil FT UnhasTanggal Percobaan: Juli 2009Nama: Kelompok IXKelompok: IX

Data SampelDiameter:4.4cmTinggi:10.5mm105Volume:159.656cm3Luas:15.2053cm2Berat Tanah Basah:299.02grBerat Tanah Kering:202grKadar Air:48.030%Berat Volume Basah:1.873gr/cm3Berat Volume Kering:1.265gr/cm3LRC:0.185kg/div

Tabel 10.1. PEMERIKSAAN KUAT TEKAN BEBAS

No.Deformasi AksialGaya dan Tegangan AksialGaya AksialTegangan AksialPembacaan Deformasidh (mm)Regangan Aksiale=dh/h (%)Pembacaan Beban(div)Gaya AksialP(kg)Koreksi LuasA=A0/(1-dh/h)(cm2)Tegangans=P/A(kg/cm2)10.500.4760.20.03715.2780.00221.000.9520.40.07415.3520.00531.501.4290.50.09315.4260.00642.001.9050.70.13015.5010.00852.502.3810.90.16715.5760.01163.002.85710.18515.6530.01273.503.3331.20.22215.7300.01484.003.8101.40.25915.8070.01694.504.2861.70.31515.8860.020105.004.7621.80.33315.9660.021115.505.2381.90.35216.0460.022126.005.71420.37016.1270.023136.506.19020.37016.2090.023147.006.6672.10.38916.2910.024157.507.1432.20.40716.3750.025168.007.6192.30.42616.4590.026178.508.0952.40.44416.5450.027189.008.5712.40.44416.6310.027199.509.0482.50.46316.7180.0282010.009.5242.50.46316.8060.0282110.5010.0002.60.48116.8950.0282211.0010.4762.70.50016.9850.0292311.5010.9522.80.51817.0750.0302412.0011.4292.80.51817.1670.0302512.5011.9052.90.53717.2600.0312613.0012.3812.90.53717.3540.0312713.5012.8572.90.53717.4490.0312814.0013.3332.90.53717.5450.0312914.5013.8102.90.53717.6420.0303015.0014.2862.90.53717.7400.0303115.5014.76230.55517.8390.0313216.0015.23830.55517.9390.0313316.5015.71430.55518.0400.0313417.0016.19030.55518.1430.0313517.5016.6673.10.57418.2460.0313618.0017.1433.10.57418.3510.0313718.5017.6193.20.59218.4570.0323819.0018.0953.20.59218.5650.0323919.5018.5713.30.61118.6730.0334020.0019.0483.30.61118.7830.0334120.5019.5243.30.61118.8940.0324221.0020.0003.30.61119.0070.0324321.5020.4763.30.61119.1200.0324422.0020.9523.30.61119.2360.0324522.5021.4293.30.61119.3520.0324623.0021.9053.30.61119.4700.0314723.5022.3813.30.61119.5900.0314824.0022.8573.30.61119.7110.031

Hubungan antara konsisitensi tanah dengan kekuatan tanah lempung dari Test Unconfined Compression

Konsistensiquton /ft2Sangat Lunak0 - 0.25Lunak0.25 - 0.5Menengah0.5 - 1.48Kaku1 - 2Sangat Kaku2 - 4Keras> 4

Persamaan garis regresiy =-0.0001x +0.0033x +0.0037y' =-0.0002x +0.00330 =-0.0002x +0.0033x =16.500qu =0.033kg/cm2=0.02942ton /ft2termasuk konsisitensi menengah

8,9 cm4,9 cmGambar Retakan

REGRESI KTB SMPL 1NOXYX^2X^3X^4X^5X^6X^7X^8X^9X^10X^11X^12XYX2YX3YX4YX5YX6Y10.4760.0020.2270.10797969980.05141890470.02448519270.01165961560.00555219790.00264390380.00125900180.00059952470.00028548790.00013594660.00115322540.00054915490.0002615020.00012452490.00005930.0000320.9520.0050.9070.86383759850.82270247480.78352616650.74621539660.71068133010.6768393620.64460891620.61391325350.58467928910.55683741820.00459083020.00437221920.0041640180.00396573170.00377690.0036031.4290.0062.0412.9154518954.16493127865.94990182668.499859752312.14265678917.346652555724.780932222535.401331746450.573331066372.2476158090.00856642290.0122377470.0174824960.02497499380.03567860.0509741.9050.0083.6286.910700788313.163239596725.07283732747.757785384790.9672102567173.2708766793330.0397651035628.64717162571197.4231840492280.80606485530.01591340650.0303112500.0577357150.10997279070.20947200.3989952.3810.0115.66913.497462477132.136815421676.5162271942182.1814933195433.76546028451032.77490543932458.98787009355854.733024032213939.8405334133190.09650811910.02545096650.0605975390.1442798550.34352346540.81791301.9474162.8570.0128.16323.323615160366.6389004581190.3968584518543.99102414811554.26006899464440.743054270212687.837297914936250.9637083283103574.182023795295926.23435370.03376908730.0964831060.2756660190.78761719572.25033486.4295373.3330.01411.11137.037037037123.4567901235411.52263374491371.74211248284572.473708276215241.579027587350805.2634252909169350.878084303564502.9269476771881676.423158920.04704497350.1568165780.5227219281.74240642735.808021419.3600783.8100.01614.51255.285606306210.6118335467802.33079446373056.498264623611643.802912851944357.3444299121168980.359732998643734.7037447562452322.68093249342181.641647250.06241763320.2377814600.9058341333.450796695513.145892250.0795994.2860.02018.36778.7172011662337.35943356931445.82614386866196.39775943726555.990397587113811.38741823487763.0889352712090413.238294028958913.8784029438395345.19315550.08484483180.3636207081.5583744616.678747689628.6232044122.67088104.7620.02122.676107.9796998164514.18904674492448.519270213911659.615572447355521.9789164157264390.3757924561259001.789487895995246.6166089828548793.4124237135946635.2972560.09932084490.4729564042.25217335410.724635018351.0696906243.18900115.2380.02227.438143.7209804557752.82418333923943.364769872220655.7202231403108196.629740259566744.2510204032968660.3624878315550125.708269681453039.4242692426658777.9366480.11474592390.6010500783.14835754916.491396686386.3835065452.48503125.7140.02332.653186.58892128281066.22240733036092.699470458734815.4255454785198945.2888313061136830.221893186496172.6965324337120986.8373282212119924.7847331212113855.912760.13110351530.7491629444.28093111124.4624634914139.7855057798.77432136.1900.02338.322237.23140049671468.57533640829091.180653955456278.7373816288348392.1837910362156713.5187064113351083.687230282649565.6828534511640168.5129023167296281.270350.1413114910.8747854205.41533831733.5235229163207.52657041284.68829146.6670.02444.444296.29629629631975.308641975313168.724279835487791.4951989026585276.63473901844.23126012294.87173415299.16115610199477073466290.1589795661.0598637727.06575847847.1050565168314.03371012093.55807157.1430.02551.020364.43148688052603.082049146218593.4432081871132810.308629908948645.06166776036.15548400258.25345716130.342469400931176385780780.1775360101.2681143599.05795970864.6997121965462.14080143301.00572167.6190.02658.050442.28485044813369.789336747625674.5854228385195615.8889359121490406.772811355480.17486517944.18659184336.635022356851382655760040.1969642711.50068016111.43375360687.1143131851663.72810055056.97600178.0950.02765.533530.50426519814294.558337318334765.4722544815281434.7753934212278281.515118443231.313149302348.721208638061.089784212875792055328010.2172477951.75867262414.236873625115.2508817224932.98332827552.72218188.5710.02773.469629.73760932945397.750937109546266.436603796396569.4566039663399166.770929135715.179249734701.532140583156.01183478556231572673339110.2288352271.96144480016.812384000144.10614856751235.195559210587.39051199.0480.02881.859740.63276104096700.963076084660627.7611645745548536.8867271034962952.784744902906.147406264388.953675725423.83332565633583008927161000.2503023242.26464007220.489600649185.38210111291677.266629115175.26950209.5240.02890.703863.83759853158227.024747918878352.6166468459746215.3966366277106813.301367683936.203644608916.226139132535.41584679289095568374181780.2620966742.49615880123.772940957226.4089614982156.275823820535.960232110.0000.028100.000100010000100000100000010000000.0000100000000.0001000000000.0010000000000.0010000000000010000000000000.2847032022.84703201928.470320192284.70320191932847.032019228470.320192210.4760.029109.7511149.767843645412045.1869334279126187.6726359121321966.094313849168.6068145086528.2611519954105.5915923328725.2716681582474117475943544290.3080932613.22764368633.813410039354.23572422023711.040920438877.571552310.9520.030119.9551313.789007666614389.1177030147157595.0986520661726041.556718904264.6682207046708.2712267654423.9224836215119.1527201568940029792194553360.3322502983.63893183039.854967660436.50678865624780.788637752361.018412411.4290.030130.6121492.711370262417059.5585172845194966.383054682228187.234925464996.9704291028536.8053326040420.6238011890521.4243442160595949648183538190.3448419743.94105112645.040584295514.74953480085882.851826367232.592302511.9050.031141.7231687.182809631820085.5096384737239113.2099818292846585.833133887926.5847403427697.4374802710683.7857175127187.8168065627604581030509053030.3700391204.40522762052.443185952624.32364228867432.424313088481.241822612.3810.031153.2881897.851203973623497.2053825309290917.7809265743601839.192444594199.5253552118660.7896835754847.8684633155259.241047839065114129732455680830.3827604654.73893909058.672579210726.42240926528993.8012576111351.825092712.8570.031165.3062125.364431486927326.114119117351335.7529600764517173.966658077950.9995746716512.8519600640879.51123436811308.021587044716817204048606447960.3953217935.08270876665.349112709840.202877689210802.6084274138890.679782813.3330.031177.7782370.370370370431604.9382716049421399.1769547335618655.692774915409.2364998872123.15213318294975.36177577266338.132367696884508315692917934450.4077231045.43630805372.484107375966.454764997412886.0635333171814.180442913.8100.030190.7032633.51689882336367.6143170798502219.4358072936935411.256495774726.87391322603371.11618264522743.98252224361702.603483098328274480999292952120.4199643985.79950835580.0884487111105.983339347215273.1032577210914.283083014.2860.030204.0822915.451895043741649.312786339594990.1826619868499859.7523121426567.89021734665255.57424780932222.49354013317464.145057333106631722476158090090.4320456756.17208107688.1725868031259.608382902317994.4054700257062.935293114.7620.031217.9143216.823237231447486.4382638921700990.27913364510347951.7396152755478.06062254961818.99033287531613.67491387371439.8772538135783981070801052049230.4592761406.779790643100.0826237741477.410160466521809.3880831321948.109803215.2380.031232.2003538.278803584953916.6293879608821586.73353083112519416.8919190772066.92422907002924.55944297187421.85675004760713.86102857868299261567357993131510.4714429447.183892477109.4688377471668.09657519825418.6144792387331.268253315.7140.031246.9393880.466472303260978.758850479958237.63907895515058020.0427236626029.24193718409030.94558432141914.85918219372947.61144291615748912267439676054300.4834442137.596980483119.3811218801875.989058121129479.8280562463254.440883416.1900.031262.1324244.034121585168712.93339709281112495.1121434118011825.6252291620033.93154721467216.03376442802545.301237645374542.97200380679687913244258623518530.4952799478.018818183129.8284848662101.984993071134032.1379831550996.519733516.6670.031277.7784629.629629629677160.49382716051286008.2304526721433470.5075357224508.45915953741807.65199229030127.521653817168792.02275636194798674593936579977830.5238484848.730808068145.5134677952425.224463256440420.4077209673673.462023617.1430.031293.8785037.900874635686364.01499375261480525.9713214725380445.2227435093346.67417458743085.841127864167185.852191957151757.39375764083158416441669997001310.5357366379.184056641157.4409709962698.988074212446268.3669865793172.005483717.6190.032310.4315469.495734801996367.30580365181697900.1498738729915383.5930527080568.06749286657627.855163622062966.962882864918941.70507933342861168949301755172750.5651135369.956762305175.4286691773090.886075973554458.4689576959506.357823818.0950.032327.4385925.0620883274107215.4092173531940088.3572663935106360.7505635257956.438211495143973.644208007367142.143763942834000.586810944175810612324565651466800.57703203810.441532109188.9420095903418.950649719261866.72604251119493.137913918.5710.033344.8986405.2478134111118954.6022490632209156.8989111741027199.5512761933705.951014150197396.233262789380215.754880374204006.819063552093155516832311030146000.60717315511.276072881209.4127820703889.09452415472226.04116291341340.764454019.0480.033362.8126910.7007882518131632.3959667012507283.7326990747757785.3847909672102.566617327087667.934330039765103.516286471716257.3711974231840490222808060648552800.61909993311.792379681224.6167558244278.414396643881493.60755511552259.191534119.5240.032381.1797442.0688910485145297.5354918992836761.4072227955384389.37911081314268.830321111373820.020412174441248.008047215281508.6315711229835326430674305868970500.63084462312.316490261240.4648098674694.789145024891660.16902191789555.680904220.0000.032400.0008000160000320000064000000.00001280000000.000025600000000.000512000000000.0010240000000000.0020480000000000040960000000000000.64240722512.848144497256.9628899375139.2577987492102785.15597502055703.119504320.4760.032419.2748585.1419933053175791.002720063599530.0556964773704663.04521509190719.497230902476637.324632764997811.8812956616621862.2026530214987622654323773546084400.65378773813.387082261274.1164462945612.860566979114930.00208582353328.614144420.9520.032439.0029198.1427491632192722.9909348474038005.5243491884605830.03401772693581.6644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:485608622.2222222222149333.3333333332758720.0806248453085008.81834221050643118.44067A1.2369583559nsigma xsigma x2sigma x3sigma x4sigma x5sigma x6Asigma Y5608622.2222222222149333.3333333332758720.0806248453085008.81834221050643118.4406721226481101.5529B16.6376982273sigma xsigma x2sigma x3sigma x4sigma x5sigma x6sigma x7Bsigma XY8622.2222222222149333.333333333275872053085009105064311821226481102435637068775C266.0287337532sigma x2sigma x3sigma x4sigma x5sigma x6sigma x7sigma x8Csigma X2y149333.3333333332758720.08062484530850091050643118212264811024356370687759052140833278D4668.6480990178sigma x3sigma x4sigma x5sigma x6sigma x7sigma x8sigma x9Dsigma X3y2758720.0806248453085008.81834221050643118212264811024356370687759052140833278189988452435718E86714.3023818246sigma x4sigma x5sigma x6sigma x7sigma x8sigma x9sigma x10Esigma X4Y353085008.81834221050643118.440672122648110243563706877590521408332781899884524357184020609176957180F1672495.85233977sigma x5sigma x6sigma x7sigma x8sigma x9sigma x10sigma x11Fsigma X5Y1050643118.4406721226481101.55294356370687759052140833278189988452435718402060917695718085677660768304600G33131277.4647002sigma x6sigma x7sigma x8sigma x9sigma x10sigma x11sigma x12Gsigma x6Ya * b = c1.756081529-1.80298739350.5824209309-0.08384540060.0059829041-0.00020714750.0000027762A-0.0000891962b [= a-1 * 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1000000A-0.0000891960100000B0.0046033030010000C0.0001213150001000D-0.0000673660000100E0.0000053410000010F-0.0000001730000001G0.000000002

A-0.000089196B0.004603303C0.000121315D=-0.000067366E0.000005341F-0.000000173G0.000000002Diperoleh persamaan regresi :654321.0000000Y=0.000000002x6+-0.000000173x5+0.000005341x4+-0.0000673659x3+0.000121315x2+0.004603303x+-0.000089196Y'=0.000000012x5+-0.000000863x4+0.000341806x3+-0.0002020978x2+0.000242631x+0.004603303Mencari akar-akar persamaan :1617-90978.99019267060.03135624580.031650416726.7683704082Dengan cara coba-coba diperoleh nilai x=33.33sehinggaqu=0.033kg/cm2=0.0294ton/ft2sehingga tanah termasuk konsistensi sangat lunakQU=0.033

Mencari nilai x dengan metode SecantNox1x2x3f'(x1)f' (x2)f'(x3)15050.0133.68325788540.60012934340.625011840412.2562710698250.0133.68325788526.629544127940.625011840412.25627106986.0494209056333.68325788526.629544127919.754739301512.25627106986.04942090562.4703604091426.629544127919.754739301515.00957065186.04942090562.47036040911.0838836528519.754739301515.009570651811.30001641222.47036040911.08388365280.4628784246615.009570651811.30001641228.53502741691.08388365280.46287842460.2004351356711.30001641228.53502741696.42332950950.46287842460.20043513560.087071914488.53502741696.42332950954.80137860250.20043513560.08707191440.038514986596.42332950954.80137860253.51485945860.08707191440.03851498650.0176764994104.80137860253.51485945862.42355399340.03851498650.01767649940.0088411442113.51485945862.42355399341.33153348760.01767649940.00884114420.0053723276122.42355399341.3315334876-0.35973258310.00884114420.00537232760.004473942 131.3315334876-0.3597325831-8.78220327690.00537232760.004473942-0.2503961203

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