圆排式异型深基坑稳定性数值模拟分析

为定量分析圆排式异型深基坑支护的侧向变形特性与抗隆起稳定性,利用数值仿真软件Midas GTS NX对矩形深基坑及圆排式异型深基坑进行对比研究。研究结果表明:矩形深基坑受侧向挤压成"类工字型",最大侧向位移超过6 m,在实际工程中,基坑已经破坏坍塌,安全性差。对于圆排式异型深基坑,沿深度方向,粉质黏土层是易发生破坏的薄弱土层,同时开挖时隆起值最大,为17. 2 cm;在地连墙边界两侧,墙身侧向位移取得最大值2. 96 cm,充分证明圆排式异型深基坑相比于矩形深基坑具有足够的安全性与稳定性。

Numerical Simulation and Analysis of Stability of Different-type Round Deep Foundation Pit

In order to quantitatively analyze the lateral deformation characteristics and anti-uplift stability of circular-row special-shaped deep foundation pit support, a comparative study of rectangular deep foundation pit and circular-row special-shaped deep foundation pit is carried out by using numerical simulation software Midas GTS NX. The results show that the rectangular deep foundation pit is extruded laterally into "I-like" shape, and the maximum lateral displacement exceeds 6m. In practical engineering, the foundation pit has been destroyed and collapsed, and the safety is poor. For circular-row special-shaped deep foundation pit, along the depth direction, silty clay layer is the weak soil layer which is easy to be destroyed; on both sides of the boundary of the connecting wall, the lateral displacement of the wall reaches the maximum value of 2.96 cm; along the excavation depth direction, the uplift value of excavation 1 > excavation 3 > excavation 2, which fully proves that circular-row special-shaped deep foundation pit has sufficient safety and stability compared with rectangular deep foundation pit.