主动区土体加固对深厚淤泥质土地铁深基坑变形的影响

Influence of active zone reinforced soil on deformation of deep foundation pit of subway station in thick and silty soil

为研究主动区加固土体对地下连续墙水平位移的影响,以昆山地铁时代大厦站基坑为背景,采用ABAQUS软件建立三维模型,研究不同加固深度、宽度、强度情况下,主动区加固土体对地下连续墙水平位移的影响规律。结果表明:主动区加固深度和宽度在不同的范围内取值,会导致地连墙水平位移减少,但加固效果存在差异;采用“宽度小,深度大”的加固形式可以提高加固效果;减小一定范围内的加固土体强度对地连墙水平位移的影响极小;主动区土体的不同加固深度、宽度、强度对深厚淤泥质土地铁深基坑变形有一定的影响,需在实际工程中密切关注。为基坑结构的变形控制提供理论参考。

To study the influence of the reinforced soil in the active zone on the horizontal displacement of the underground continuous wall, based on the foundation pit of Shidai Dasha Station in Suzhou, the paper studies the influence law of the reinforced soil in the active zone on the horizontal displacement of the underground con-tinuous wall under the different depth, width and strength of reinforcement by usingthe ABAQUS software to es-tablish a three-dimensional model. The research results show that the depth and width of reinforcement of the active zone in different ranges will reduce the horizontal displacement of the underground continuous wall, but the reinforcement effect is different. The reinforcement method of the small width and large depth will improve the reinforcement effect. Reducing the strength of the reinforced soil within a certain range has minimal impact on the horizontal displacement of the underground continuous wall. The different reinforcement depth, width and strength of the soil in the active zone have a certain impact on the deformation of the deep foundation pit of sub-way station in the thick and silty soil, which requires close attention in actual engineering. The research will pro-vide a theoretical reference for the deformation control of the foundation pit structure.