作　　者： (李晓玮）; (刘翠娜）;

机构地区： 北京市地质研究所,北京100120

出　　处： 《城市地质》 2017年第3期36-40,共5页

摘　　要： 在暴雨造成地下水位比较浅的情况下,由于墙前后水头差引起的渗流常常使挡土结构发生破坏。本文选取了稳定渗流条件下,分别采用土-水整体作为隔离体以及土骨架作为隔离体进行分析,归纳总结了不同水位以及不同类型的土体土、水压力计算,进而探讨挡土结构两侧土、水压力分布规律。当墙前后以及基底土为均质的粘性土时,对于板桩等悬臂式挡土结构,由于底部宽度远小于长度,故可将底部段造成的水头损失忽略。此时,当水头差足够大,渗流作用造成土体发生流土时,板桩一侧向上渗流范围内对挡土结构无被动土压力,另一侧向下渗流范围内对挡土结构的主动土压力增大为静水工况时主动土压力的2倍。当墙前地下水位平基底,基底为透水地基,墙后为均质粘性土时,挡土构件侧面、底部所受的水压力均为0。 The seepage of the retaining wall due to the difference between the front and the back of the wall often causes the failure of the retaining structure, especially in the case of shallow water caused by heavy rainfall. Under the steady fow condition, this paper takes the soil-water as a whole body and isolated soil skeleton as an isolator, and summarizes the calculation of different level and different soil and water pressure, and then discusses the retaining structure on both sides of the soil, water pressure distribution. When the soil around the wall and the foundation soil are homogeneous and cohesive soil, the soil loss due to the bottom of the cantilever retaining structure is much smaller than that of the length of the retaining wall. At this time, when the water head difference is large enough, the seepage caused by soil body fow will occur when the pile side upward seepage in the range of retaining structure of passive earth pressure, 2 times of active earth pressure on retaining structure for increasing hydrostatic condition of active earth pressure on the other side of the downward fow range. When the water level in front of the wall is fat, the basement will be pervious to water, and the water pressure on the side and bottom of the retaining member is zero.

关 键 词： 稳定渗流 挡土结构 土压力 水压力