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采用伺服控制单轴加载系统对预制多裂隙水泥砂浆试件进行加载试验,探索裂隙角度和分布密度对多裂隙类岩石材料断裂破坏强度的影响规律。对试验数据整理分析,应用FLAC3D建立应变软化模型,进行数值模拟。试验数据和数值分析结果表明,裂隙分布密度相同时,裂隙倾角对试件断裂破坏强度的影响比较显著,25°附近取得最小值;裂隙角度相同时,裂隙分布密度对试件断裂破坏强度的影响与裂隙倾角有关,角度较小时,影响比较显著,随着角度的增大,影响越来越弱。试验所得结论,对于预测地下工程中多裂隙情况下围岩强度变化规律提供了依据。
The servo-controlled uniaxial loading system was used to carry out the loading test of the prefabricated multi-fractured cement mortar specimens to explore the effect of fracture angle and distribution density on fracture failure strength of multi-fractured rock materials. Finishing analysis of experimental data, the establishment of strain softening model FLAC3D, numerical simulation. The experimental data and numerical analysis show that when the fracture distribution density is the same, the influence of crack dip angle on the failure strength of the test piece is significant, and the minimum value is obtained around 25 °. At the same crack angle, the influence of fracture distribution density on the fracture failure strength of the test piece It is related to fissure angle. When the angle is small, the influence is quite significant. As the angle increases, the influence becomes weaker and weaker. The conclusions obtained from the experiment provide the basis for predicting the variation law of the surrounding rock strength in the case of multiple fractures in underground engineering.