软土狭长深基坑抗隆起破坏模式试验研究
发布时间：2018-12-08 14:28
【摘要】：针对软土地区基坑底土层为饱和软黏土的情况,设计了狭长深基坑的抗隆起离心模型试验,分析不同开挖深度和水位条件下的基坑围护墙弯矩、土压力分布、水平位移以及基坑隆起稳定破坏机制。基于离心模型试验的基本参数和工况,建立了有限元数值模型,分析试验工况基坑的抗隆起稳定性与破坏状态,并进行对比验证。试验结果表明:随着开挖深度和坑外水位的增加,坑底软土层产生向上的隆起变形,当隆起变形较大时,围护墙由于坑内土体侧向约束的减弱,底部产生较大的向坑内的水平位移,同时导致支撑轴力增大,基坑最终表现出围护墙绕某道支撑点向坑内的转动踢脚破坏。数值计算结果表明:随着坑外水位的升高,基坑抗隆起稳定性安全系数逐渐减小,当发生抗隆起稳定破坏时,基坑底产生较大的隆起位移,破坏机制与离心模型试验结果相同。
[Abstract]:In view of the condition that the bottom layer of foundation pit in soft soil area is saturated soft clay, the anti-uplift centrifugal model test of long and narrow deep foundation pit is designed, and the moment and earth pressure distribution of retaining wall of foundation pit under different excavation depth and water level are analyzed. Horizontal displacement and stability failure mechanism of foundation pit uplift. Based on the basic parameters and working conditions of centrifugal model test, the finite element numerical model is established, and the stability and failure state of foundation pit under test condition are analyzed and compared. The test results show that with the increase of excavation depth and the water level outside the pit, the bottom soft soil produces upward uplift deformation. When the uplift is large, the surrounding wall is weakened due to the lateral constraint of the soil in the pit. At the bottom, the horizontal displacement in the pit is larger, and the axial force of the support is increased. The foundation pit finally shows the failure of the retaining wall turning and kicking around a certain supporting point in the pit. The numerical results show that with the increase of the water level outside the pit, the safety factor of anti-uplift stability of foundation pit decreases gradually. When the anti-uplift stability failure occurs, the uplift displacement of the foundation pit bottom is larger, and the failure mechanism is the same as the result of centrifugal model test.
【作者单位】： 盐城工学院土木工程学院;同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金青年基金项目(No.41402270) 江苏省科技计划前瞻性联合研究项目(No.BY2014108-26)~~
【分类号】：TU753
[Abstract]:In view of the condition that the bottom layer of foundation pit in soft soil area is saturated soft clay, the anti-uplift centrifugal model test of long and narrow deep foundation pit is designed, and the moment and earth pressure distribution of retaining wall of foundation pit under different excavation depth and water level are analyzed. Horizontal displacement and stability failure mechanism of foundation pit uplift. Based on the basic parameters and working conditions of centrifugal model test, the finite element numerical model is established, and the stability and failure state of foundation pit under test condition are analyzed and compared. The test results show that with the increase of excavation depth and the water level outside the pit, the bottom soft soil produces upward uplift deformation. When the uplift is large, the surrounding wall is weakened due to the lateral constraint of the soil in the pit. At the bottom, the horizontal displacement in the pit is larger, and the axial force of the support is increased. The foundation pit finally shows the failure of the retaining wall turning and kicking around a certain supporting point in the pit. The numerical results show that with the increase of the water level outside the pit, the safety factor of anti-uplift stability of foundation pit decreases gradually. When the anti-uplift stability failure occurs, the uplift displacement of the foundation pit bottom is larger, and the failure mechanism is the same as the result of centrifugal model test.
【作者单位】： 盐城工学院土木工程学院;同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金青年基金项目(No.41402270) 江苏省科技计划前瞻性联合研究项目(No.BY2014108-26)~~
【分类号】：TU753
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