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为了研究隧道开挖过程中围岩在加卸载条件下的应力应变特性,采用TAW-2000微机控制岩石伺服压力试验机对辉绿岩进行了三轴加载和卸围压试验,通过分析岩石强度、体积变形在试验全过程中的变化规律及其与围压的关系,研究岩石的力学特性、变形特性及其破坏机理。结果表明,在卸载试验条件下,岩石在屈服破坏后,同样具有应变软化特性和破裂膨胀特性;同时,由于在卸载条件下应变能的释放,岩石应力力学特性受围压的影响表现得更为突出,其卸载岩性强度影响系数接近三轴加载岩性强度影响系数的两倍,与加载试验相比,卸载试验中岩石单轴抗压强度和三轴强度明显偏低。研究成果可为地下工程开挖过程中围岩受力变形特性研究提供参考。
In order to study the stress and strain characteristics of surrounding rock during loading and unloading, the TAW-2000 computer-controlled rock servo-pressure tester was used to test the diabase loading and unloading confining pressure. By analyzing the rock strength, The variation law of volume deformation during the whole experiment and its relationship with confining pressure, the mechanical properties, deformation characteristics and failure mechanism of rock are studied. The results show that under the conditions of unloading test, the rock also has the properties of strain softening and rupture after yield failure. At the same time, due to the release of strain energy under unloading condition, the rock mechanics behavior is more affected by confining pressure , The influence coefficient of unloading lithology strength is nearly double that of triaxial impact strength. Compared with loading test, the uniaxial compressive strength and triaxial strength of unloading test are obviously lower than unloading test. The research results can provide a reference for the study of mechanical deformation of surrounding rock during excavation of underground engineering.