膨胀土路堑边坡桩板墙现场试验研究  

Field Test Research on Pile-sheet Wall in Expansive Soil Cutting Slope

作　　者：李兴瑷 贾刚龙 杨果林[3] 邓志宏 汪鹏福[3] LI Xing’ai;JIA Ganglong;YANG Guolin;DENG Zhihong;WANG Pengfu(China Railway No.9 Group Co.,Ltd.,Shenyang,Liaoning110013,China;China Railway No.9 Bureau Group No.1 Construction Co.,Ltd.,Suzhou,Jiangsu215538,China;School of Civil Engineering,Central South University,Changsha,Hunan410075,China)

机构地区：[1]中铁九局集团有限公司,辽宁沈阳110013 [2]中铁九局集团第一建设有限公司,江苏苏州215538 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《施工技术（中英文）》2022年第20期94-97,103,共5页Construction Technology

基　　金：国家重点研发计划(2019YFC1509800);国家自然科学基金(51778641);中铁九局集团有限公司课题:西康高铁膨胀土路基建造关键技术研究(XKGT-07-GGB2022-037)。

摘　　要：为分析膨胀土路堑边坡桩板墙承载特性及其所受土压力的分布形式,依托某高速铁路线路右侧桩板墙开展现场试验研究,研究桩板墙后土体含水率、土压力、抗滑桩及挡土板弯矩分布规律。试验结果表明,由于降雨入渗,抗滑桩及挡土板后土压力沿深度方向为K形分布,而挡土板后土压力沿水平方向为U形分布;抗滑桩悬臂段弯矩沿深度方向逐渐增大,挡土板中部存在较大正弯矩,而板端存在较小负弯矩;作用于桩板墙上的膨胀力所引起的桩身弯矩增量较大,在桩板墙设计计算时不可忽视。In order to analyze the load-bearing characteristics and the distribution form of soil pressure of pile-sheet wall in expansive soil cutting slope, a field test study was conducted based on the pile-sheet wall on the right side of a high-speed railway. The distribution of soil water content, soil pressure, bending moment of anti-slip pile and retaining plate were researched. The test results show that the earth pressure behind the anti-slip piles and retaining slabs is distributed in the K-shaped along the depth direction due to the infiltration of rainfall, and the earth pressure behind the retaining slabs is distributed in the U-shaped along the horizontal direction. The bending moment of anti-slip pile in cantilever section gradually increases along the depth direction. The bending moment in the middle of the retaining slab is positive, while the bending moment at the end of the retaining slab is negative. The bending moment of anti-slip pile increment caused by the expansion force acting on the pile sheet wall is large and should be considered in the pile sheet wall design calculation.

关 键 词：膨胀土 路堑边坡 桩板墙 试验 土压力 含水率 

分 类 号：TU443[建筑科学—岩土工程]