摘要
采用在墙面板背后安装土压力盒以及在土工格栅上安装柔性位移计的方法,对某高速公路加筋土挡墙水平土压力和土工格栅拉筋位移进行了系统测试。试验研究表明,施工期间土工格栅加筋土挡墙墙背土压力随填土高度的增加而增大,增长速率逐渐减小,其数值均小于理论计算结果,沿墙高分布形式与计算结果有较大差别;土工格栅拉筋在施工期应变变形较大,工后应变非常小,挡墙下部土工格栅拉筋端部应变随填土高度变化较大,在加筋体锚固区末端存在过渡区,其工程特性逐渐向非加筋体填土过渡。根据试验结果对土工格栅加筋土挡墙施工控制及关键技术提出了相关建议。
The lateral earth pressure and the tensile displacement of geogrids are tested on the highway geogrids reinforced earth retaining wall, thought using the earth pressure cells back of the wall facing and the inductive flexible displacement sensor on the geogrids. With the increasing of wall height, the lateral earth pressure of different layers will increase, while the growth rate of the earth pressure decreases and the measured lateral earth pressure less than the theoretical value. Meanwhile, the curve of the lateral earth pressure along wall height is different from theory curve. The obvious tensile displacement of geogrids occurs during construction; but the displacement post-construction is specially small.The clear strain variety with wall height takes place front the geogrids at lower wall. The transition area will happen at the end of the anchor area in the reinforced wall; and the engineering character of the transition area closes to the no-reinforced soil gradually. Based on the test result, the correlative advice about construction controlling and key technique of the geogrids reinforced earth retaining wall is put forward.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第1期206-210,共5页
Rock and Soil Mechanics
关键词
加筋土挡墙
土工格栅
土压力
拉伸变形
现场试验
reinforced earth retaining wall
geogrids
earth pressure
tensile displacement
field test
