压剪应力作用下断续节理岩体的破坏分析

节理岩体的力学特性主要受控于节理，节理间的相互作用及其贯通是岩体工程的重要问题。利用Dugdalc-Barcnblatt模型揭示了多节理贯通力学机理——主要受外部荷载、节理间的相互作用二因素的影响。利用裂纹尖端的应力强度因子、损伤局部化区的长度确定了节理扩展和贯通的力学条件。通过实验验证了模型的正确性和可行性。其结论对岩体工程的稳定性分析具有重要理论和现实意义。

FAILURE ANALYSIS OF INTERMITTENT JOINTED ROCKS UNDER COMPRESSION-SHEAR STRESS

The mechanical behavior of jointed rockmass is mainly controlled by joints. The interaction between joints and the coalescence of joints are important problem for geotechnical engineering. The coalescence of two collinear joints and a periodic row of collinear joints are investigated by using Dugdale-Barenblatt model,and the high level of compression-shear stress and interaction between joints are considered. The mechanical conditions of joint propagation are determined by stress intensity factor and the length of damage and strain localization zone. Experimental validations are given to illustrate the applicability of the proposed model. The conclusions are of important significance for rockmass engineering.