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依托德阳某超深圆形基坑项目,结合流固耦合理论,采用三维有限差分法对超深圆形基坑的施工过程进行动态数值模拟,对设计与施工方案进行了评估和优化。结果表明:由于支护桩间的高压旋喷桩的作用,圆形基坑开挖引起的排桩水平位移明显减小,而桩周的土层强度显著增大;降低圆形基坑周边土层中的地下水位,不仅可避免在施工过程中发生流土和管涌事故,还可在一定程度上降低工程开挖对土体的扰动。排桩的中下部弯矩比其他区域更大,因此,土体开挖至基坑的中下部位置时应特别注意。
Based on the ultra-deep circular foundation pit project in Deyang, combined with the fluid-solid coupling theory, the three-dimensional finite difference method is used to simulate the construction process of the ultra-deep circular foundation pit. The design and construction scheme are evaluated and optimized. The results show that due to the effect of high pressure jet grouting piles between support piles, the horizontal displacement of row piles caused by circular foundation pit excavation decreases obviously while the soil strength of pile circumference increases significantly, The groundwater level in the layer not only can avoid the occurrence of flowed soil and pipe accident during the construction, but also can reduce the disturbance to the soil caused by the excavation to a certain extent. The middle and lower bending moment of the pile is larger than that of other areas. Therefore, special attention should be paid to excavation of the soil to the middle and lower part of the foundation pit.