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DEVELOPMENT AND APPLICATION OF EXPERIMENT SYSTEM FOR SOIL-HYDRAULIC STRUCTURE INTERFACE
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摘要: 为研究开采沉陷形成的地表变形对水工建筑或构筑物的影响，研制了可进行水下剪切的界面剪切试验系统。通过该试验系统，完成正交试验方法设计的界面剪切试验，研究土样的初始孔隙比、初始饱和度以及结构表面粗糙度对土-水工结构界面剪切力学性能的影响。试验表明：该系统能较好地模拟水下土-结构界面的主要物理力学特性；同时也可以实现普通直剪试验仪器的功能。对正交试验结果进行极差和方差分析的结果表明：在所设计的初始孔隙比范围内，其对界面剪切强度影响很小。初始饱和度对界面剪切强度的影响非常显著，而且饱和状态下是否采用水下剪切的方式对界面剪切强度是有影响的。结构表面粗糙度对界面剪切强度有影响，其影响规律需进一步研究。Abstract: To study the effects of surface deformation on hydraulic structure due to coal mining subsidence, an experiment system for soil hydraulic structure interface was developed to investigate the interface behavior under water.A series of soil-structure shear tests using the orthogonal experiment method were performed by that system.The influence of initial porosity ratio, initial saturation and surface roughness on mechanical behavior of soil-hydraulic structure interface.The test results showed that the system of the interface could study well the main mechanical behaviors of the interface under water and could realize the function of common direct shear apparatus.By means of range analysis and variance analysis, the results showed the initial porosity ratio designed had little impact on the shear strength.The initial saturation had a significant impact on the shear strength, which was affected by the method under water in saturated condition.Surface roughness had an impact on the shear strength, but more research was needed to study the influence rule.
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