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地质力学模型试验是在复杂条件下进行大型地下洞室围岩稳定性分析的重要研究手段,能够真实地反映地质构造和工程结构的空间关系,准确模拟施工过程对厂房稳定性的影响以及岩体的破坏特征。双江口水电站地下洞群模型试验中采用预留孔径灌胶方式进行高精度的棒式光纤光栅(FBG)位移传感器的埋设,以便对洞室周边的位移进行量测,同时应用FLAC3D进行数值模拟比较。结果表明:棒式光纤光栅传感器量测方法解决了模型试验中内部变形小、量测精度要求高的问题,与数值模拟结果相吻合;试验中传感器埋设的方法是成功的,无论是开挖阶段还是超载阶段传感器均能有效地监测模型内部变形,揭示地下洞室群模型在开挖阶段和超载阶段的变形机制和破坏特征。
Geomechanical model test is an important research method for the stability analysis of surrounding rock of large-scale underground caverns in complex conditions. It can truly reflect the spatial relationship between geological structure and engineering structure, and accurately simulate the impact of construction process on the stability of the plant and rock mass Destruction characteristics. The underground hole group model experiment of Shuangjiangkou Hydropower Station is used to embed high-precision FBG displacement sensor in order to measure the displacement around the cavern and to simulate the displacement by using FLAC3D . The results show that the FBG sensor measurement method solves the problem of small internal deformation and high measurement precision in model test, which is in good agreement with the numerical simulation results. The method of embedding sensors in the experiment is successful, no matter in the excavation stage Or overloaded stage sensors can effectively monitor the deformation of the model and reveal the deformation mechanism and failure characteristics of the underground cavern group during the excavation and overloading phases.