| 千枚岩残坡积土大型直剪试验研究 |
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| 引用本文： | 谭捍华,孟庆山.千枚岩残坡积土大型直剪试验研究[J].岩土力学,2011,32(Z1):360-0363. |
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| 作者姓名： | 谭捍华 孟庆山 |
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| 作者单位： | 重庆大学土木工程学院;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室 |
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| 摘 要： | 土体抗剪强度是边坡稳定性分析的重要力学参数,而大型直剪试验是确定粗粒土抗剪强度指标较为有效的方法,但获取所需原状土样较为困难。通过现场挖取边坡残坡积原状土样,开展原状土样和击实土样的室内常规小型直剪对比试验,证明在有效控制密度、干密度和含水率条件下采用击实土样获取的直剪强度指标可替代原状土样试验结果。击实土样的大型直剪与原状土样的常规直剪试验结果对比分析表明,由常规小型直剪试验获得残坡积土的抗剪强度略高于大型直剪试验结果。由于室内常规小型直剪试验获取的抗剪强度指标往往比边坡实际发生滑动时的抗剪强度指标稍大,建议在边坡稳定性分析中对抗剪强度指标选取时,采用以大型直剪试验获得的有效控制密度、干密度和含水率条件下击实土样的峰值强度和残余强度,由此进行的边坡稳定性计算将更为科学合理。
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| 关 键 词： | 残坡积土 剪切特性 抗剪强度 原状土样 击实土样 |
| 收稿时间： | 2010-11-24 |
Experimental study of large scale direct shear test of phyllite residual soil |
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| TAN Han-hua,MENG Qing-shan.Experimental study of large scale direct shear test of phyllite residual soil[J].Rock and Soil Mechanics,2011,32(Z1):360-0363. |
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| Authors: | TAN Han-hua MENG Qing-shan |
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| Institution: | 1.College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The shear strength of soil is an important mechanical parameter for slope stability analysis. The large scale direct shear test is an effective method to obtain the shear strength index of coarse grain soil; but it is difficult to excavate massive undisturbed soil. The undisturbed sample was excavated in-situ, the laboratory small scale direct shear tests were carried out on undisturbed sample and compacted sample for comparison. It is approved that the shear strength indices of undisturbed sample could be replaced by the test results of compacted sample when the density and water content of compacted soil could be controlled effectually. The results of small scale shear test of undisturbed soil and large scale shear test of compacted soil were comparatively analyzed. The shear strength of residual soil achieved from small scale direct shear test is more slightly high than that of test results from large scale direct shear test under the same pressure. The research results show that the shear strength indices of small scale direct shear test is slightly bigger than that of slope take place slide in-situ. It is suggested that the peak value strength and remaining strength achieved from large scale direct shear test should be selected for slope stability analysis when the density and water content of compacted soil could be controlled effectually; it is more reasonable to calculate slope stability by this method. |
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| Keywords: | residual soil shear characteristics shear strength undisturbed sample compacted sample |
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