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中文摘要：
地质力学模型试验是研究大型地下洞室群围岩稳定性状况的重要方法,但是,许多制约因素使得这类试验难以达到预期效果,其中包括试验过程中物理量的量测问题。以双江口水电站地下洞群稳定性为研究对象,开展了模型试验为准确量测三维应力状态下洞群模型试验中围岩内部的微小位移,设计、制作和安装了高精度微型多点位移计,获得了围岩在开挖全过程中的位移变化规律曲线,同时,还开展了与模型试验相对应的数值模拟。将试验结果与数值模拟结果进行了对比分析。研究结果表明,设计成功的微型多点位移计能够广泛应用在各类岩土工程模型试验之中。
英文摘要：
Geomechanical model tests play important roles in stability analyses of large-scale underground cavern groups.However,the application of this type of test was restricted by a number of factors,in particular the measurement of physical quantities during the test.A large-scale geomechanical model test was conducted under three-dimensional stress state.To measure small displacements in the surrounding rock masses,a mini multipoint extensometer measurement system was developed.The variation process and regular curves of the displacements of surrounding rock masses during excavation can be obtained.In addition,3D numerical simulation was performed to simulate the whole process of the physical model tests.The comparison between experimental and numerical results leads to conclusions on the stability of the underground cavern group.The study shows that design and application of the mini multipoint extensometer measurement system have achieved satisfactory results.
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