PAGEPAGE2/4直接剪切實驗一、實驗?zāi)康闹苯蛹羟袑嶒炇菧y定土的抗剪強度的一種常用方法，通常采用四個試力，然后根據(jù)庫侖定律確定土的抗剪強度指標：摩擦角φc。二、實驗原理：φc三、實驗設(shè)備：環(huán)等組成。其它輔助設(shè)備：百分表、天平、環(huán)刀、秒表、飽和器、透水石、削土刀等。四、實驗步驟：土試樣。制備四份試樣，在四種不同豎向壓力下進行剪切試驗。取出剪切容器的加壓蓋與上部透水石，將上下盒對準，插入固定銷。和加力框架。R0=0。P=100kpa。8s/r3--5（1）當百分表讀數(shù)不變或明顯后退，(2)4mm6mm時才停止剪切。卸除壓力，取下加力框架、鋼珠、加壓蓋等，倒出試樣，刷凈剪切盒。2-7200、300、400kpa五、數(shù)據(jù)分析：(KPa)手輪轉(zhuǎn)數(shù)鋼環(huán)讀數(shù)剪切位移剪應(yīng)力100200300(0.01mm)(0.01mm)(KPa)0000216.024.039.520421.059.051.870623.097.056.810824.0136.059.2801024.8175.261.2561224.8215.261.2561424.8255.261.2561624.7295.361.0091824.8335.261.2562024.8375.261.2562224.8415.261.2562424.8455.261.2560000220.020.049.400432.048.079.040638.281.894.354842.0118.0103.7401047.0153.0116.0901249.0191121.0301449.1230.9121.2771649.1270.9121.2771849.1310.9121.2772049.0351121.0302249.0391121.0302449.0431121.0300000225.01561.750442.038103.740652.267.8128.934857.8102.2142.7661062.6137.4154.6221267.0173165.4901469.0211170.4301672.0248177.8401873.3286.7181.0514004002073.6326.4181.7922273.6366.4181.7922473.5406.5181.5452673.6446.4181.7920000228.012.069.160452.028.0128.440669.250.8170.924880.279.8198.0941089.0111219.8301290.8149.2224.2761494.8185.2234.1561696.8223.2239.0961897.6262.4241.0722097.6302.4241.0722297.6342.4241.0722497.6382.4241.0722697.6422.4241.072剪切位移為4mm時對應(yīng)的剪應(yīng)力（kpa）即抗剪強度如下表：100