论文部分内容阅读
由于岩体性状的复杂性和多样性,现场试验是进行岩石力学研究的重要手段。以往的现场承压板试验,由于试验条件的限制,试验荷载的设定将使岩体蠕变呈衰减蠕变形态,却难以反映岩体的等速蠕变和加速蠕变。坝基软弱岩体的力学特性是影响大坝及地下结构长期稳定性的重要因素。通过对坝基软弱岩体现场承压板试验曲线中表现出的衰减蠕变和等速蠕变两阶段特性,辨识了蠕变模型。并推导了刚、柔性承压板深部岩体的黏弹性一般解,给出了Maxwell模型、广义Kelvin模型、Burgers模型的黏弹性位移的统一表达式。结合试验数据,以理论解析反演法得到相关的蠕变参数,为以后的坝基长期稳定性计算奠定基础。
Due to the complexity and diversity of rock properties, field tests are an important means of rock mechanics research. Previous site bearing plate test, due to the limitations of test conditions, set the test load will make the rock mass creep attenuation attenuation creep morphology, but hard to reflect the rock mass constant velocity creep and accelerated creep. The mechanical properties of dam foundation and weak rock mass are the important factors that affect the long-term stability of dam and underground structure. The creep model was identified through the two-stage characteristics of attenuation creep and constant-velocity creep in the test curve of on-site bearing plate of weak rock mass in dam foundation. The general viscoelastic solutions of rock mass in rigid and flexible bearing plates are deduced. The unified expressions of Maxwell model, generalized Kelvin model and Burgers model are given. Combined with the experimental data, the relevant creep parameters are obtained by theoretical analysis and inversion method, which lays the foundation for the future long-term stability calculation of dam foundation.