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通过Plaxis有限元程序对某软土基坑开挖支护工程进行模拟,对比分析了基坑支护中设置木桩和未设置木桩时的情况。模拟计算结果表明,木桩对软土层的水平位移起到明显的控制作用,对竖向位移也起到一定的控制作用。从塑性区看,未设置木桩时存在一定贯通趋势,设置木桩时由于木桩作用,塑性区未能向坡顶延伸。设置木桩与未设置木桩相比,前者安全系数明显大于后者。木桩支护效果好,造价低,工期短,施工方便,其与喷锚结合在软土基坑支护工程中具有可行性和优越性。
Through the finite element program of Plaxis, the excavation and support engineering of a soft soil foundation pit is simulated, and the situation of setting up and removing the stake in foundation pit support is comparatively analyzed. The simulation results show that the wooden piles play a significant role in controlling the horizontal displacement of soft soil and also controlling the vertical displacement. From the plastic zone to see, there is a certain penetration trend when there is no set of stakes, set the stakes due to the role of stakes, plastic zone failed to extend to the top of the slope. Set the wooden piles and no set compared to the former safety factor was significantly greater than the latter. It has the advantages of good supporting effect, low cost, short construction period and convenient construction. It is feasible and superior in combination with shotcrete and anchor in soft soil foundation pit support project.