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井筒式地下连续墙基础内部含有大面积的土芯,由于存在墙内土芯、墙体以及外部土体的相互作用,其水平承载特性复杂。采用水平静载荷试验,进行了3个不同截面尺寸单室井筒式地下连续墙模型试验。便于对比,同时进行了3个相应尺寸的单片墙模型试验。基于墙身内力及位移测试结果,研究了单室井筒式地下连续墙基础的水平承载特性,分析了水平荷载-位移特性、土压力-位移的分布规律,结果表明:单室井筒式地下连续墙基础呈整体倾斜破坏特性,前墙外侧土压力对承载力贡献最大。结合模型试验特征,分别采用4种弹簧的弹性基础分析法和8种弹簧的刚性基础分析法计算单片墙与单室井筒式地下连续墙,与试验结果吻合较好,分析方法可为设计提供参考。
The inner surface of the wellbore diaphragm wall foundation contains a large area of core. Due to the interaction of the soil core, the wall and the external soil, the horizontal bearing properties are complex. Using the horizontal static load test, three models of single chamber borehole diaphragm wall model with different cross-sectional dimensions were tested. Easy to compare, at the same time carried out three corresponding single-wall model test. Based on the test results of wall internal force and displacement, the horizontal bearing properties of single-chamber underground diaphragm wall are studied. The horizontal load-displacement characteristics and the distribution of earth pressure-displacement are analyzed. The results show that single- The foundation is characterized by overall tilt failure, and the earth pressure on the outside of the front wall contributes the most to the bearing capacity. Combined with the characteristics of the model test, the single-wall and single-chamber underground diaphragm wall were calculated by the elastic foundation analysis method of the four springs and the rigid foundation analysis method of the eight springs, respectively, which was in good agreement with the experimental results. The analysis method could be provided by design reference.