基于多功能起伏结构面制样模具的异性结构面剪切强度研究

结构面广泛存在于岩体工程中，其性质更是对岩体的破坏特性有着显著的影响。利用自主研发的起伏度可控的结构面制样模具制作出不同起伏角的结构面试块，并进行室内直剪试验，在此基础上研究起伏角对结构面抗剪强度的影响。自主设计研发的波状起伏结构面制样模具，可实现锯齿状、波状、规则与非规则等表面起伏形态结构面试样的制作。根据模具设计思路，参照结构面的野外实际特征，快速制作出表面起伏角分别为5°、10°、15°、20°、25°、30°的结构面试样进行室内剪切试验。在对试验结果分析的基础上，利用Barton所提出的JRC-JCS估算模型建立结构面起伏角与JRC之间的对应关系，综合考虑异性结构面上下强度差异，提出考虑起伏角影响的结构面抗剪强度公式。 

Anisotropic rock joint shear strength study based on sample mould of multi-function undulation structure plane

Discontinuities exist in the rock engineering extensively and their property impacts conspicuously the failure characteristics of rock. A self-developed sample mould with controllable undulation was used to make samples of structure plane with different undulation angle, to carry out shear test in lab, and on the basis of this to study the influence of the undulation angle on shear strength of structure plane. The undulating sample mould has the advantages of higher practicability for making serrated, undulating, regular and irregular discontinuity samples. According to the mould design and the characteristics of actual discontinuities in the field, the samples with undulating angle of 5, 10, 15, 20, 25 and 30 degrees were made rapidly to conduct the direct shear test. The results are in good accordant with the general law of discontinuity shear test, verifying the reliability and practicality of the mould. On the basis of the test results, JRC-JCS model proposed by Barton was used to set up the corresponding relation between the undulating angle and JRC, and taking into account different strength of the anisotropic structure plane, a shear strength formula considering undulating angle has been proposed.