嵌岩地下连续墙受力性能研究及设计方法探讨

Mechanical analysis and discussion on design method of rock-socketed diaphragm

利用结构试验和有限元法分析嵌岩地下连续墙的承载能力,指出支护体系自重和基岩嵌固作用可以提高地下连续墙正截面的承载能力,据此提出地下连续墙正截面设计的新方法,在保证开挖安全的前提下减少了墙体配筋量并提高了墙身嵌岩截面的塑性转动能力。最后对施工现场实测的地下连续墙变形数据进行反分析,得到了墙体钢筋和混凝土应力,进一步验证了设计的合理性。

Based on the experiment and FEM analysis on load-bearing capacity of diaphragm, new design method of normal section is presented in which the gravity of support system and restraint function of bedrock are considered. Compared with traditional method, the rebar ratio of diaphragm decreases obviously and plastic rotation of diaphragm section near bedrock is guaranteed. During excavation of the pit, observation system is applied and the measured displacements are used in back analysis, so the stress of rebar and concrete of diaphragm are calculated to confirm the design.