降雨条件下锚杆框架梁加固膨胀土高边坡现场试验  

An In-situ Experiment of Frame Beam with Anchor Rod on Expansive Soil High Slope in Rainfall

作　　者：廖文斌 周伏良 杨果林[3] 张雨加 LIAO Wenbin;ZHOU Fuliang;YANG Guolin;ZHANG Yujia(Hunan Xiangjiang New Area Investment Group Co.,Ltd.,Changsha,Hunan 410075,China;Civil Engineering Co Ltd,China Construction Fifth Engineering Bureau,Changsha,Hunan 410075,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)

机构地区：[1]湖南湘江新区投资集团有限公司,湖南长沙410075 [2]中建五局土木工程有限公司,湖南长沙410075 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《公路工程》2018年第2期60-63,71,共5页Highway Engineering

基　　金：国家自然科学基金资助项目(51478484);国家自然科学基金资助项目(51678571);中建五局土木工程有限公司立项项目(020116D0003009)

摘　　要：依托在建桐溪桥的某边坡建设工程,对膨胀土高边坡上锚杆框架梁的梁后土压力进行一个夏季的现场监测,定量分析降雨对梁后土压力的影响,并根据降雨前后土压力的变化反演最大膨胀力的参考值。结果表明:降雨对边坡土压力影响显著,但由于受框架梁约束以及坡面并非严格意义上的平面,各测点梁后土压力的改变幅度并不一致;根据观测期间降雨前后梁后土压力最大增加值,本文得出此处框架梁后土壤膨胀力的参考值为60 kPa。Based on the construction of a slope,through the in-situ monitoring of soil pressure behind frame beam on an expansive soil high slope during one summer period,the influence of rainfall on soil pressure behind frame beam is quantitatively analyzed and maximum reference value of soil expansion force is calculated according to variation of soil pressure before and after rainfall.The results are as follows:rainfall has a large influence on soil pressure of slope,but the soil pressure behind frame beam at different location does not change with an equal magnitude because of both constraints of the frame beams and not a strict plane slope;the recommended reference value of expansive force behind frame beam is 60 kPa,which can be used as a reference in the design of slope retaining structure.

关 键 词：膨胀力 膨胀土高边坡 降雨 锚杆框架梁 现场试验 

分 类 号：U416.03[交通运输工程—道路与铁道工程]