滑带土残余强度的试验研究
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摘要
由于滑带土的残余强度是边坡稳定分析中重要的控制因素，因此通过试验来确定土的强度、强度衰减规律和残余强度指标便成为被特别重视的问题，其中滑带土的残余强度确定由于在试验方法上需要一些独特的控制而使得其研究既具有理论意义，也有实际意义。
本文以广东省乐昌峡水利枢纽一个近坝区古滑坡的实际滑带土为研究对象，针对含粗粒细粒土的强度特征，采用室内试验、整体稳定计算、及理论分析对其残余强度的确定及在计算中的采用进行了系统研究。研究的主要内容如下：
1．通过直接剪切试验对试验用土进行了多组往复排水剪对比试验，研究了含粗粒细粒土的残余强度的试验方法、残余强度的影响因素、以及残余强度与峰值强度的关系。基于试验成果提出了实用的单因素经验公式。
2．探讨了“预切面三轴试验”测定残余强度的方法，针对含粗颗粒细粒土和细粒土的区别提出了合理的试验方案，通过对比试验论证了试验方法和试验结果，指出了采用三轴试验确定滑带土残余强度应注意的事项和试验结果合理性的判断。为残余强度的室内试验提供了新的路径。
3．基于滑带土残余强度试验结果，针对一实际边坡进行了整体稳定分析，比较了采用峰值强度和采用残余强度对边坡稳定性判别的不同，分析了强度参数的选取对边坡稳定性计算结果的影响。
As the residual strength of slip soil is an important controllingfactor in the landslide stability analysis, therefore,issues like determining the residual strength, strength attenuation law and residual strength indicator of soil by tests havealready been paid more and more attentions. Among which, the determination of residual strength of the slide soil needs some unique control and its research has boththeoretical significance andcertain practical meaning.
Taking the actual slip soil of an ancient landslide nearing the dam area of Lechang gorge hydro junction in Guangdong province as the research object, this paper targets the strength characteristic of fine-grained soil containing coarse particles and make a systematic research on the determination ofresidual strength and its adoption in calculation by laboratory test, overall stability calculation and theoretical analysis. The main contents are as follows:
1. Many groups of reciprocating drainage shear contrast tests are used in the soil by direct shear test, research the residual strengthtest method of fine-grained soil containing coarse particles, influencing factor of residual strength and the relationship of peak strength and residual strength. Based on the test results, put forward the practical single factorempirical equation.
2. Discuss the"pre-cut triaxial test" method of determining residual strength, put forward a reasonable testing program according to the difference between fine-grained soil containing coarse particles and fine-grained soil, demonstrate the method and result of test by contrast tests, point out the announcements of determining the residual strength by triaxial test and the reasonable judgment of test results, which provide a new path for the laboratory test ofresidual strength.
3. Based on the test results of residual strength of slip soil, make the overall stability analysis of the actual slope, compare the difference of distinguishing slope stability through peak strength and residual strength, analyze the influence of strength parameters selection on the calculation results of slope stability.
本文以广东省乐昌峡水利枢纽一个近坝区古滑坡的实际滑带土为研究对象，针对含粗粒细粒土的强度特征，采用室内试验、整体稳定计算、及理论分析对其残余强度的确定及在计算中的采用进行了系统研究。研究的主要内容如下：
1．通过直接剪切试验对试验用土进行了多组往复排水剪对比试验，研究了含粗粒细粒土的残余强度的试验方法、残余强度的影响因素、以及残余强度与峰值强度的关系。基于试验成果提出了实用的单因素经验公式。
2．探讨了“预切面三轴试验”测定残余强度的方法，针对含粗颗粒细粒土和细粒土的区别提出了合理的试验方案，通过对比试验论证了试验方法和试验结果，指出了采用三轴试验确定滑带土残余强度应注意的事项和试验结果合理性的判断。为残余强度的室内试验提供了新的路径。
3．基于滑带土残余强度试验结果，针对一实际边坡进行了整体稳定分析，比较了采用峰值强度和采用残余强度对边坡稳定性判别的不同，分析了强度参数的选取对边坡稳定性计算结果的影响。
As the residual strength of slip soil is an important controllingfactor in the landslide stability analysis, therefore,issues like determining the residual strength, strength attenuation law and residual strength indicator of soil by tests havealready been paid more and more attentions. Among which, the determination of residual strength of the slide soil needs some unique control and its research has boththeoretical significance andcertain practical meaning.
Taking the actual slip soil of an ancient landslide nearing the dam area of Lechang gorge hydro junction in Guangdong province as the research object, this paper targets the strength characteristic of fine-grained soil containing coarse particles and make a systematic research on the determination ofresidual strength and its adoption in calculation by laboratory test, overall stability calculation and theoretical analysis. The main contents are as follows:
1. Many groups of reciprocating drainage shear contrast tests are used in the soil by direct shear test, research the residual strengthtest method of fine-grained soil containing coarse particles, influencing factor of residual strength and the relationship of peak strength and residual strength. Based on the test results, put forward the practical single factorempirical equation.
2. Discuss the"pre-cut triaxial test" method of determining residual strength, put forward a reasonable testing program according to the difference between fine-grained soil containing coarse particles and fine-grained soil, demonstrate the method and result of test by contrast tests, point out the announcements of determining the residual strength by triaxial test and the reasonable judgment of test results, which provide a new path for the laboratory test ofresidual strength.
3. Based on the test results of residual strength of slip soil, make the overall stability analysis of the actual slope, compare the difference of distinguishing slope stability through peak strength and residual strength, analyze the influence of strength parameters selection on the calculation results of slope stability.
引文
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