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选取不同侧压力,采用RLW-3000微机控制剪切蠕变试验机对不同种类岩石与充填体组合模型进行循环加卸载试验,通过VIC-3D非接触全场应变系统对组合模型在试验过程中的损伤破坏进行同步监测,根据实验过程中应变场的演化对组合模型破裂机理进行了分析。试验结果表明:充填体能够增强围岩的完整性及抗压强度;充填体与围岩组合模型的破裂经历了一个扩容的过程;不同侧压下的加载与卸载应力-应变曲线均不重合,每一个加卸载循环过程都会形成一个塑性滞回环;在组合模型中,张拉应变区首先出现在强度比较低的充填体区域,并随着荷载的增大逐渐向围岩两帮移动;在循环加卸载过程中,不同种类的围岩破坏形式不同,强度较低的围岩出现剪切破坏;而强度较大的围岩则会出现拉伸破坏。
Different lateral pressures were selected. RLW-3000 computer-controlled shear creep testing machine was used to carry out cyclic loading and unloading tests on different types of rock and filling composite model. Through the VIC-3D non-contact full-field strain system, Damage and destruction were monitored synchronously. According to the evolution of strain field during the experiment, the fracture mechanism of combined model was analyzed. The experimental results show that the filling body can enhance the integrity and compressive strength of the surrounding rock. The failure of the combined model of the filling body and the surrounding rock has undergone a dilatancy process. The stress-strain curves of the loading and unloading under different lateral pressures do not coincide, In the combined model, the tensile strain zone first appears in the region of the filling body with lower strength, and gradually moves to the surrounding rock mass with the increase of load. In the cycle During the process of loading and unloading, different types of surrounding rock are damaged in different forms, and the surrounding rock with lower strength appears shear failure; however, the surrounding rock with higher strength will be tensile and damaged.