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在工程实践中,基坑开挖深度越来越大,导致土体和周围建筑对于支护结构的变形要求较高,因此双排桩支护广泛应用于深基坑支护结构中。双排桩支护结构形式选择以及前后排桩的间距、桩顶点位移的控制、冠梁的大小等仍是设计的难点。结合合肥某基坑工程实例,运用有限元软件ABAQUS建立双排桩支护结构三维模型,通过有限元分析,研究了开挖深度、排距、结构形式等因素对双排桩受力与变形的影响,并将变形分析结果与实测结果进行比较,两者接近,实测位移量满足相关要求,施工过程证明该支护效果良好。
In engineering practice, the excavation depth of foundation pit is more and more large, resulting in high deformation of soil and surrounding structures for the support structure. Therefore, double-row pile support is widely used in deep foundation pit support structure. The selection of the form of double-row piles support structure and the spacing between the front and rear rows of piles, the control of displacement of the pile top and the size of the crown beam are still the difficulties of design. Combined with the engineering example of a foundation pit in Hefei, the three-dimensional model of double-row piles supporting structure is established by using finite element software ABAQUS. By means of finite element analysis, the influences of excavation depth, row spacing and structure form on the stress and deformation of double- And the result of deformation analysis is compared with the measured result. The two are close to each other, the measured displacement meets the relevant requirements, and the construction process proves that the supporting effect is good.