不规则结构面剪切特性试验研究

为对岩体工程中不规则结构面力学特性进行基础性研究,选取N.R.Barton提出的10条标准剖面线中的第1、4、6、8、10条模拟结构面的表面形态对水泥砂浆试件进行不同法向应力水平下的常规剪切试验,并在对试验数据对结构面的剪切特性和剪切扩容现象进行深入分析的基础上,提出了适合水泥砂浆材料的抗剪强度经验公式和反正切函数的结构面剪切特性方程.研究结果表明:粗糙系数越大或法向应力越大,结构面越易表现为切齿破坏;粗糙系数越大或法向应力越小,结构面越易表现出扩容现象. 

Experimental Study on Shear Strength Characteristics of Irregular Rock Mass Discontinuities

To study on mechanical properties of irregular discontinuities in rock mass engineering, conventional shear tests under different normal stress were carried out with No.1, 4, 6, 8, 10 standard discontinuities proposed by Barton, and simulated with cement mortar specimens. Based on experimental data analysis, shear characteristics and shear dilatancy phenomenon are analyzed in depth. Besides, an empirical shear strength formula and an arc tangent equation of discontinuity shear properties are put forward. Results show that, cutting failure effect is more likely to take place when roughness coefficient or normal stress is higher; dilatancy phenomenon is prone to emerge along with the increase of roughness coefficient or the decrease of normal stress.