Abstract：Based on the experimental study on performance of geogrid-reinforced soil (GRS) bridge abutment with flexible face under static load, the effects of offsets distance, D, between abutment foundation and panel of retaining wall on the ultimate bearing capacity of GRS bridge abutment, deformation characteristics, strain of geogrids and earth pressure are comprehensively and comparatively analyzed. The test results show that the ultimate bearing capacity of GRS abutment exhibits a remarkable increase tendency with the increase of D/HL (HL, height of geogrid-reinforced retaining wall) before D/HL=0.4 for GRS retaining wall with the length of geogrids supposed to be equal to the height of GRS abutment, and the maximum ultimate bearing capacity can be obtained when D/HL=0.4, which is followed by a significant decrease while Dis greater than 0.4HL. Before failure happens to GRS abutment, the settlement of abutment foundation and top surface of GRS behind abutment tends to be linear and the differential settlement reaches the lowest level when D/HL=0.4, and the ratios of horizontal deformation of panel to the height of lower wall are less than 1%. Moreover, horizontal deformations at top of lower walls are significantly greater than those in the middle and at the bottom of lower walls. Additionally, the maximum values of strains of geogrids occur and keep to be away from panel with the increase of D/HL, and the strain level of geogrids in the lower wall and upper wall is almost the same as that when D/HL=0.4. Therefore, the optimum performance of GRS bridge abutment can be obtained simultaneously.
肖成志, 刘贺, 王荣霞, 陈培. 土工格栅加筋土柔性桥台结构性能的试验研究[J]. 岩土工程学报, 2013, 35(4): 767-772.
XIAO Cheng-zhi, LIU He, WANG Rong-xia, CHEN Pei. Experimental study on performance of GRS bridge abutment with flexible face. Chinese J. Geot. Eng., 2013, 35(4): 767-772.
 田小革,应荣发,张起森. 应用土工格栅处理软土地基上的桥头跳车问题[J]. 岩土工程学报, 2000,226:744-746. TIAN Xiao-ge, YING Rong-fa, ZHANG Qi-sen. Appling geogrid to deal with the bumping at the bridge-head on soft foundation[J]. Chinese Journal of Geotechnical Engineering, 2000, 226: 744-746. (in Chinese)  周志刚,郑健龙,宋蔚涛. 土工格栅加筋柔性桥台的机理分析[J]. 中国公路学报, 2000,131:18-21. ZHOU Zhi-gang, ZHENG Jian-long, SONG Wei-tao. Analysis of mechanism of flexible abutment reinforced by geogrids[J]. China Journal of Highway and Transport, 2000, 131: 18-21. (in Chinese)  彭芳乐,李福林,平川大贵,等. 格栅加筋挡土墙加载速率相关的变形强度特性分析及有限元模拟[J]. 岩土工程学报, 2011,332:174-180. PENG Fang-le, LI Fu-lin, HIRAKWA Daiki, et al. Deformation and strength characteristics of geogrid- reinforced soil retaining wall under change of loading rate and its FEM simulation[J]. Chinese Journal of Geotechnical Engineering, 2011, 332  TATSUOKA F, HIRAKAWA Nojiri M Aizawa,et al. A new type of integral bridge comprising geosynthetic-reinforced soil walls[J]. Geosynthetics International, 2009,164:301-326.  HELWANY H B, JONATHAN Wu, BURKHARD F. GRS bridge abutments-an effective means to alleviate bridge approach settlement[J]. Geotextiles and Geomembranes, 2003,21:177-196.  JONATHAN Wu, LEE K Z, PHAM T. Allowable bearing pressure of bridge sills on GRS abutments with flexible facing[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006,1327:830-841.  SCOTT A Berkheimer. Instrumented geogrid reinforced mechanically stabilized earth wall undergoing large settlement[D]. Delaware: Univeristy of Delaware, 2007.  SKINNER G D, ROWE R K. Design and behavior of a geosynthetic reinforced retaining wall and bridge abutment on a yielding foundation[J]. Geotextiles and Geomembranes, 2005,23:234-260.  MUNI Budhu. Soil mechanics and foundations[M]. NewYork: John Wiley & Sons, INC,2003.