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为了研究红黏土对基坑的不利影响,以广西宜州市城中路地下通道商业街项目基坑支护工程为依托,运用PLAXIS有限元程序,选取合理的岩土体本构模型对基坑开挖支护过程进行数值模拟,对比分析了三种不同的结构加固方案加固前后的竖向应力、水平位移、剪力、弯矩等计算。结果表明:在不考虑红黏土膨胀的情况下,原设计已能满足变形、护壁桩承载力限值要求,但若考虑红黏土膨胀,按照原设计方案进行计算,发现桩身最大水平位移29.36 mm,桩顶位移24.87 mm,已超过21 mm的限值;在3种结构加固的方案中,方案2、方案3都无法有效控制变形,而方案1能控制变形,建议采用方案1对基坑结构进行加固。
In order to study the negative influence of red clay on foundation pit, based on the foundation pit supporting project of Chengzhong Road underpass in Yizhou, Guangxi, PLAXIS finite element program was used to select the reasonable constitutive model of rock and soil Excavating and supporting process was simulated and the vertical stress, horizontal displacement, shear force and moment before and after consolidation were compared and analyzed. The results show that the original design has been able to meet the requirements of deformation and retaining wall piles bearing capacity without considering the swelling of red clay. However, considering the expansion of red clay, according to the original design scheme, the maximum horizontal displacement of the pile body is found to be 29.36 mm , The pile top displacement is 24.87 mm, and the limit of 21 mm has been exceeded. Among the three kinds of structural reinforcement schemes, neither scheme 2 nor scheme 3 can effectively control the deformation, while scheme 1 can control the deformation. Reinforcement.