顺层岩质边坡结构面抗剪强度特性试验研究

针对云南省普-宣（普立至宣威）高速公路某顺层岩质边坡现场工程地质特性，按形成将结构面划分为4种类型。通过自制的加载装置，对自然状态下的一类结构面进行压剪试验，利用最小二乘法线性拟合得到结构面抗剪强度指标值，同时与基于JRC-JCS等效摩尔-库仑抗剪强度法分析结果的对比，数据结果基本吻合，验证了该装置的可行性。根据边坡结构面不同类型分别考虑填充厚度、填充物含水率等因素进行了多次剪切试验研究获取抗剪强度参数，结果表明，结构面强度参数在饱和状态下比自然状态偏小，随填充厚度增加c逐渐增大， 减少。试验结果对正确评价结构面特性及在后阶段对顺层岩质边坡稳定性计算提供参考数据，研究成果为现场结构面强度参数取值提供了简便试验方法。

An experimental study of shear strength characteristics of structural plane of bedding rock slope

According to the engineering geological characteristics of bedding rock slope in Puli-Xuanwei Expressway in Yunnan province, the structural planes are divided into four types based on their formation mode. A home-made loading device is used to test the compression strength and shear strength of structural planes under natural conditions; and strength parameter values are obtained by least square linear fitting method, structural surface shear strength parameter values are obtained. By contrasting the equivalent shear strength of Mohr-Coulomb method based on JRC-JCS, the results basically agree with each other; and the feasibility of the device is verified. Considering filling thickness, moisture content of filler and other factors based on different types of slope structural planes, the shear strength parameters is obtained through several shear tests. The results show that the values of shear strength parameters in saturated state are smaller than that in the state of nature, meanwhile c increases and ψ decreases gradually with the increase of filling thickness. The test results provide reference data for correct evaluation of the characteristics of structure planes and stability calculation of the rock bedding slope in the next stage. This research results provide a simple test method for the choice of strength parameters relative to structural planes in the test field.