摘要
在离心机上进行30.0～62.5m的双面加筋土高挡墙模型试验。模型组数为34组,模型分为设置错台和不设置错台2种情况,压实系数分别取0.80和0.90。试验表明,对于填土的压实系数为0.90的情况,无论设置错台与否,模拟的挡墙的最大直立高度可达62.5m;对于填土压实系数为0.80的情况,当不设错台时,模拟的挡墙高度可达30.0m,当设错台时,模拟的挡墙高度可达33.0m。挡墙的破裂面线开始于墙脚或设置错台处,当达到顶部时,距挡墙面板的距离为挡墙高度的0.169倍,其在顶部的范围为挡墙高度的0.08～0.35倍。破裂面线为对数螺旋曲线。挡墙施工完毕后,其侧向位移的发展已基本完成,且数值很小。墙后填土侧向压力的分布为沿着墙高自上而下变化,在上部大约4cm以上的范围内,其值接近主动土压力;而在上部4cm以下的范围内,其值基本上在主动土压力线之内,有个别点的值介于主动土压力与静止土压力之间。竖向土压力的分布基本上同侧向压力的分布有相似的规律性。所得结果对工程设计有指导意义。
Double-face reinforced earth retaining walls of 30.0-62.5 m high are modelled in centrifuge. The number of models is 34. In the tests, the maximum height of the retaining wall, the variation of lateral earth pressure, the vertical earth pressure and the shape of failure plane are determined. The experiments show that when the compacting factor is 0.90, the maximum height of the retaining wall with or without steps is 62.5 m, and when the compacting factor is 0.80, the height of the retaining wall with steps is 33.0 m and that without steps is 30.0 m. Failure surface begins at the foot of the earth retaining wall. When it arrives at the top of the backfill, the distance from the failure surface to the facing wall is 0.169 times the wall height. The failure width is (0.08-0.35) times the wall height on the top. The failure envelope is a log-spiral. When the construction is completed, the lateral displacements of the walls are almost finished with small values. The lateral earth pressure changes along the retaining wall. In the region 4 cm far from the top of backfill, the lateral earth pressure is near active earth pressure, while under the region, it is smaller than the active earth pressure and only a few points are between earth pressure at rest and active earth pressure. The vertical earth pressure has the similar distribution as that of lateral earth pressure. The obtained results can offer references to engineering design.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第3期417-423,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(59479017)
陕西省自然科学基金资助项目(97C22
2001C01)
地质灾害防治与工程地质环境保护国家专业实验室开放基金资助项目(99007)
西安公路交通大学青年科技发展资助项目
关键词
土力学
双面加筋土高挡墙
离心加载
相似材料
Failure (mechanical)
Materials
Pressure distribution
Reinforced concrete
Soil mechanics
