原位剪切试验在工程滑坡勘察中的应用

Application of in-situ shear test in engineering langslide investigation

摘要:

岩土体的抗剪强度指标，尤其是作为薄弱层的岩体结构面的抗剪强度，在滑坡稳定分析中起着至关重要的作用。现场原位剪切试验，试样受扰动小，试验状态与岩土体所处真实状态较为吻合，得到的参数也更加真实，是滑坡勘察原位测试的重要手段之一。适用于测定边坡的岩土结构面、岩土接触面、滑动面以及含碎石黏土的混合土层和其他粗颗粒土层的抗剪强度。重庆华宇·观澜华府项目工程滑坡勘察，在现场做原位剪切试验的同时，采集原状样品进行室内直剪试验，获取2种不同试验下的抗剪强度参数，分别取用2种参数对不同工况下的滑坡体进行稳定性分析计算，并与滑坡体的实际变形特征进行比较，从而验证了原位剪切试验确定岩土体抗剪强度参数的合理性，可为类似工程提供参考和借鉴。

Abstract:

The shear strength of the rock-soil body， especially the shear strength of the rock body structural plane of the weak layer， plays a vital role in the stable analysis of landslides. The sample was lightly disturbed and the test status was more consistent with the real state of the rock-soil body in the in-situ shear test， moreover， the parameters obtained were more real， which is one of the important methods of in-situ test for landslides investigation. It is suitable for determining the shear strength of the rock and soil structure surface， geotechnical contact surface， sliding surface， mixed soil layer and other coarse granular soil layers. This study takes Chongqing Huayu · Guanlanhuafu project as an example， the original sample was collected for laboratory direct shear test while the in-situ shear tests were made， by which two shear strength parameters under different experiments were obtained. The stability of the landslides under different operating conditions were analyzed and calculated using the above two parameters， and compared with the actual deformation characteristics of the landslide body， thereby the rationality of the rock-soil body shear strength parameter was verified， which can provide reference for similar projects.