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为研究深厚表土不稳定地层井壁破裂机理,设计的大型井壁受力模拟试验系统可实现土体与井壁界面剪切试验、高应力下含水层的疏排水沉降等试验。由于试验系统存在加载压力大,加载空间位置受限等影响,采用传统液压缸来模拟其力学边界条件,需要的数量较多,在模型有限的加载空间内难以布置,且同步问题使得液压控制系统复杂化。设计的新型组合式环形加载油缸解决了以上问题,并可实现如井壁、桩体等圆柱形地质构件的力学边界的模拟,运用有限元分析对油缸结构做了进一步优化。新型加载油缸的设计为岩土工程地质力学模型试验的加载方式提供了新的思路。
In order to study the mechanism of shaft wall rupture in unstable topsoil, the designed large-scale borehole force simulation test system can be used to test the interfacial shear tests between soil and borehole wall and the drainage and drainage of aquifer under high stress. Due to the large loading pressure and the limited space of loading space, the traditional hydraulic cylinder is used to simulate the mechanical boundary conditions, which requires more quantities and is difficult to be arranged in the limited loading space of the model. And the synchronization problem makes the hydraulic control system complication. The new type of combined annular loading cylinder designed to solve the above problems can be used to simulate the mechanical boundary of cylindrical geological components such as shaft lining and pile body. The structure of cylinder is further optimized by finite element analysis. The design of the new loading cylinder provides a new idea for the loading method of the geotechnical model test of geotechnical engineering.