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首页> 外文会议>14th International ISTVS conference >INVESTIGATION OF THE SOIL SHEAR STRENGTH IN THEDIRECT SHEAR TEST TAKING INTO CONSIDERATION THEINCREASE OF THE NORMAL STRESSES
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INVESTIGATION OF THE SOIL SHEAR STRENGTH IN THEDIRECT SHEAR TEST TAKING INTO CONSIDERATION THEINCREASE OF THE NORMAL STRESSES

机译：考虑正常应力增加的直接抗剪试验中的土壤抗剪强度的研究

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摘要

In this work the results are presented of the investigation of the soil shear strength inrnthe direct shear test taking into consideration the increase normal stresses. The investigationrnwas conducted in the laboratory test with the use of the standard and modified direct shearrnapparatus. The conventional soil shearing for the constant maximal normal loads of 20, 40, 70,rn100 and 130 kPa was carried out, similarly to those occurring under the low pressure tyres. Thernmodified shear test was carried out with increasing the normal stress from zero to its variousrnanalysed maximal values s, amounting to 20, 40, 70, 100 and 130 kPa. The growth of thernnormal stress was performed during the horizontal soil displacement j in the shear box till thernassumed constant values amounted to: 5, 10 and 20 mm, imitating various slips under tyres.rnThe investigation concerned shearing of the loosened sandy soil in the range of humidity from 4rnto 15 % weight.rnFrom both tests the dependencies of the shear stress t on the soil displacement j for the variousrnnormal stresses s were obtained, and on the basis of these results the soil shear strengthrnparameters: cohesion c, soil friction angle j and shear deformation modulus K, wererndetermined. In the comparative analysis of both measurement methods it was found that thernway of the application of normal load during the direct shear test has a substantial effect on thernresults of the soil shear strength. The values of the stages and maximal shear stresses t in thernanalysed loosened light soil obtained during the modified test were significantly different fromrnthose obtained in the conventional test. This effect depends on the tested maximal values of thernnormal stresses, on the soil humidity and on the length of the assumed soil displacement whenrnthe increase of the normal load was applied.rnIt is examined that the analysed theoretical model of the dependence of the shear stress t onrnthe soil displacement j, including the strength parameter assessed on the basis of the resultsrnobtained using the modified method, is approximately similar to the investigation results.
机译：在这项工作中，研究结果提出了在考虑直接法向应力增加的情况下进行直接剪切试验的土壤抗剪强度研究。使用标准和改良的直接剪切仪器在实验室测试中进行了调查。与在低压轮胎下发生的情况类似，对恒定的最大法向载荷20、40、70、100和130 kPa进行常规土壤剪切。在将法向应力从零增加到各种分析的最大值s（总计20、40、70、100和130 kPa）时进行了改良的剪切试验。在剪力箱中水平土体位移j期间进行正向应力的生长，直到其恒定值分别为5、10和20 mm，模拟轮胎下的各种滑移。湿度从4％到15％重量。rn从这两个测试中，获得了不同法向应力s的剪应力t对土壤位移j的依赖性，并在此基础上得出了土壤剪强度rn参数：内聚力c，土壤摩擦角j和确定了剪切变形模量K。在对两种测量方法的比较分析中，发现在直接剪切试验期间施加法向载荷的方法对土壤剪切强度的结果有很大影响。在改良试验中得到的经分析的松散轻质土的阶段值和最大剪应力t值与常规试验中得到的值显着不同。这种影响取决于所测得的正向应力最大值，土壤湿度以及施加法向载荷时假定的土壤位移的长度。检验了所分析的理论模型对剪应力t的依赖性在土壤位移j上，包括根据使用改进方法获得的结果评估的强度参数，与研究结果大致相似。

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