岩体力学特性的数值和物理混合试验方法

Analysis of Rock Mechanical Characteristics Based on the Hybrid Method Combing Numerical Simulation and Physical Test

借鉴数值和物理混合试验思路,对岩体工程力学特性的数值和物理混合试验进行了初步研究。采用数值和物理混合试验方法预测岩块单轴压缩全应力—应变关系曲线,并与传统数值模拟方法采用理想弹塑性Mohr-Coulomb破坏准则获得的曲线进行比较,结果表明:数值和物理混合试验方法可以获得全应力—应变关系曲线峰前非线性阶段和峰后破坏阶段,优于传统数值模拟方法,初步说明该方法是可行的;岩块内挖取的试样个数和试样尺寸变化对计算结果影响较大,挖取试样个数越多或挖取试样尺寸越大,岩块全应力—应变关系曲线峰后破坏阶段越明显,并且更接近真实岩块的力学特性。

According to the analyzing thought about hybrid approach combining numerical simulation and experiment test,a preliminary study was conducted for rock mass mechanical properties through the hybrid approach combining numerical simulation and physical test. The complete stress-strain curves of rock mass under uniaxial compression were predicted by this hybrid approach,comparing with the traditional numerical test based on the Mohr-Coulomb yield criterion. The results show that the complete stress-strain curves of rock mass obtained by the hybrid approach have the pre-peak nonlinear region and post-peak failure region;the hybrid approach has better than the traditional numerical test. Therefore,it is prelimi-narily showed that the hybrid approach is feasible for determining the rock mass uniaxial compression mechanical properties. In addition,the differ-ent number and dimension of specimen affects the results greatly;the more the number or the larger the dimension of specimens from the rock mass are,the more obvious the pre-peak nonlinear region and post-peak failure region of the complete stress-strain curves of rock mass are,and the more closing to the true mechanical properties of rock mass the results are.