节理岩体力学参数确定的数值试验方法

Numerical Experiment Method to Determining Mechanical Parameters of Jointed Rock Mass

摘要:

为解决现场或室内试验条件下难以测试大尺度岩体并确定其参数的问题，总结提出了应用数值试验方法确定节理岩体宏观力学参数的方法流程.即将节理岩体单元离散为岩块和节理两种类型，通过室内试验分别研究其力学特性，再把岩块和节理进行组合形成岩体，通过数值计算得出节理岩体的力学特性.将这套方法应用到贵州省某高速公路岩质边坡的岩体参数优化分析中，研究了试件尺寸、各向异性、岩块及节理力学参数等对岩体宏观力学参数的影响.数值试验方法为工程节理岩体参数的确定和优化提供了一种新的思路.

关键词:节理岩体; 岩体力学参数; 数值试验; 尺寸效应

Abstract:

Determination of mechanical parameters of rock mass is very important for the design and optimization in rock engineering. It is difficult to get the mechanical parameters of rock mass by filed or lab tests, hence the method to determine macro mechanical parameters of jointed rock mass using numerical experiment is presented in this paper. Firstly, jointed rock mass are discretized into rock and joints; then determine their mechanical parameters by lab test; after that, assemble the rock and joints to form rock mass; finally get the mechanical parameters of rock mass using numerical experiments. This method is applied in expressway project in Guizhou province. The optimization analysis of rock mass parameters for rock slope is conducted. The effects of specimen size, anisotropy, mechanical parameters of rock and joints on the macro parameters of rock mass are studied. The numerical test method provides a new idea for determination and optimization of mechanical parameters for jointed rock mass in engineering.

Key words:jointed rock mass; mechanical parameters of rock mass; numerical test; dimension effect