有限宽度无黏性砂土悬臂排桩柔性挡墙被动土压力试验研究

doi:10.13722/j.cnki.jrme.2019.0403

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摘要针对无黏性砂土，采用自制模型设备，模拟悬臂式排桩等柔性挡墙前倾挠曲变形位移模式，开展有限宽度范围土体变形破坏特征及被动土压力分布规律的室内模型试验。试验结果表明，柔性挡墙后被动区土体滑动破裂面不通过墙踵而交于墙身，接近或达到被动极限状态时形成贯穿的连续曲面，墙后剪切滑裂面与墙土界面之间形成竖向土拱，活动挡墙与滑裂面底部夹角处部分土体被“楔紧”。随着水平位移增大，挡墙上部被动土压力增大较明显且在有限宽度范围内一直呈增大趋势，挡墙下部土压力较易达到稳定；随着宽高比增大，达到临界状态进入半无限状态时，被动区砂土土压力均趋于稳定。柔性挡墙被动土压力呈非线性分布，随着深度增加，被动土压力逐渐增大，然后快速减小，有限宽度内宽高比越小，被动土压力的峰值越大，相同宽高比条件下，挡墙嵌固深度越大，土压力峰值越大。

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	胡卫东
	祝新念
	周喜宇

关键词 ：土力学, 有限土体, 被动土压力, 位移量, 悬臂桩

Abstract：A series of laboratory model tests were conducted to study the passive earth pressures with different limited widths of cohesionless soils against flexible retaining walls，such as cantilever piles. To simulate the forward flexure deformation mode of flexible retaining walls，such as cantilever piles，the homemade equipment model was applied in the tests. The failure characteristic and the passive earth pressure distribution were analyzed. The particle image velocimetry technique was employed to observe the development of a failure zone in the soils. The results show that the failure surface in the limited width soils behind the flexible retaining wall is a continuous and curved surface，which extend continuously to central wall body closing to or reaching passive state. Vertical soil arch appears between the sliding surface and the back of the wall，which compacts the soil at the bottom of the slip surface. With the increase of the lateral displacement，the passive earth pressures on the upper part of the moving retaining wall increase significantly and keep growing for finite soil. The pressures on the lower part of the wall increase and more easily achieve stability. With the increase of the soil width，the passive earth pressures increase and tend to be stable，reaching critical state or semi-infinite state. Moreover，the horizontal pressures distributed nonlinearly along the wall height，the passive earth pressures increase gradually and then rapidly decrease with the increase of the depth. The ratios of the backfill width is smaller，the peak value of passive earth pressure on the retaining wall is greater. And the peak value increase with the increase of the embedded depth of the wall，under the condition of the same aspect ratio.

Key words： soil mechanics limited soil passive earth pressure magnitudes of movement cantilever piles

引用本文:

胡卫东，祝新念，周喜宇. 有限宽度无黏性砂土悬臂排桩柔性挡墙被动土压力试验研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3748-3757.
HU Weidong，ZHU Xinnian，ZHOU Xiyu. Experimental study on passive earth pressures of cohesionless soils with limited width against cantilever piles flexible retaining walls. , 2019, 38(S2): 3748-3757.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0403 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3748

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