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| EXPERIMENTAL STUDY OF GEOGRIDS REINFORCED RETAINING WALL UNDER OVERHEAD LOADING |
| WANG He1，2，YANG Guangqing2，WU Lianhai3，LIU Huabei4，XIONG Baolin2 |
| (1. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；2. School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；3. The Third Survey and Design Institute of China Railway，Tianjin 300142，China；4. School of Civil Engineering and Mechanics，Huazhong University of Science and Technology，Wuhan，Hubei 430074，China) |
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Abstract Large-scale model tests in laboratory were carried out to study the behaviors of geogrids reinforced retaining wall of wrapped face under the loading on top of the retaining wall. The vertical and horizontal soil pressures，the stress diffusion angle，the coefficient of lateral soil pressure，the lateral displacement and the vertical settlement of wall face and the tension strain of geogrids were measured. The distribution of the vertical soil pressure along the geogrid length was found to be nonlinear and the position of the maximum pressure was moved from the middle of geogrids to the position under the loading point. The distribution of the lateral soil pressure along the wall height near the wall face increased linearly along the wall depth due to gravitational stress before loading and decreased along the wall depth after the overhead loading. The values of the lateral soil pressure were always smaller than the active earth pressure. The measured stress diffusion angle was greater than that of soil mass without geogrids and the stable values of the stress diffusion angle was 50°. The coefficient of lateral soil pressure was in direct proportion to the overhead loading，and its distribution along the wall height was similar to that of horizontal soil pressure. The cumulative lateral displacement of wall face had a distribution curve of S-shape，and its maximum value was located in the lower middle. The strain distributions of geogrids along its length were the curves of single-peak or twin-peak and the horizontal distance from the position of peak strains to the wall foot decreased gradually along the wall height.
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Received: 15 September 2014
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2014, Vol. 33 
