贯通裂隙岩体单轴压缩强度与能量演化机制研究

Study on Uniaxial Compressive Strength and Energy Evolution of Through-Fracture Rock Masses

【目的】研究贯通裂隙岩体的力学特征以及能量演化机制。【方法】预制完整岩体、0°、15°、30°、45°、60°倾角的裂隙岩体,采用试验设备微机控制电液伺服压力试验机(YAW6202)与PCI-Ⅱ声发射试验仪对单轴加载条件下岩石强度与能量演化规律进行分析。【结果】贯通裂隙破坏了岩石材料的完整性和均匀性,随着裂隙倾角角度上升,试件单轴压缩的破坏由上下拉压岩石破坏转为随着预制结构面破坏;不同裂隙倾角试件的单轴抗压强度与弹性模量均出现劣化;试件在单轴压缩荷载下的应力应变曲线与声发射振铃计数变化情况较吻合,振铃计数可反映岩体内部的裂隙出现、发展直至岩石破坏失稳的过程。【结论】可为裂隙岩体的劣化性质研究提供参考。

[Purposes]To study the mechanical characteristics and energy evolution mechanism of through-fissure rock masses.[Methods]prefabricated intact rock masses,fissure rock masses with 0°,15°,30°,45°and 60°dip angles,and the experimental equipment microcomputer-controlled electrohydraulic servo pressure tester(YAW6202)with PCI-Ⅱacoustic emission tester were used to investigate the rock strength and energy evolution law under uniaxial loading conditions.The analysis was carried out.[Findings]The test results show that:the integrity and uniformity of the rock material are destroyed by the through fissures,and the damage of uniaxial compression of the specimen is changed from the damage of the upper and lower tensile rocks to the damage of the prefabricated structural surface as the angle of fissure inclination rises;the uniaxial compressive strength and elastic modulus of the specimens with different fissure inclination are deteriorated;the stress-strain curve of the specimens under uniaxial compression load is in good agreement with the change of acoustic emission ringing count The stressstrain curves of the specimens under uniaxial compressive loading are in good agreement with the changes of acoustic emission ring counts,which can reflect the process of fracture emergence,development and destabilization in the rock mass.[Conclusions]It can provide a reference for the study of the deterioration properties of fractured rock mass.