加筋黏性土挡墙长期工作性能的试验研究  

Test study of long-term performances of reinforced cohesion soil retaining wall

作　　者：肖成志[1,2] 刘波[2] 李雨润[1,2] 孙建诚[1,2] 

机构地区：[1]河北工业大学河北省土木工程技术研究中心,天津300132 [2]河北工业大学土木工程学院,天津300132

出　　处：《岩土力学》2012年第1期109-114,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50909032;No.51008110);河北省自然基金资助项目(No.E2009000054);中国博士后基金资助项目(No.20070420807);河北省科技厅科技攻关项目(No.072156130)

摘　　要：基于加筋黏性土挡墙的长期工作性能试验,综合分析加筋土挡墙在回填、加载过程及加载后各阶段对格栅应变、面板变形及墙后土压力的影响,以及格栅应变受模型槽尺寸效应的影响。试验结果表明:顶部加载完成后格栅应变随时间增加而逐渐增大,约6个月后增加趋势变缓并趋于稳定;随着距面板距离的增大,筋材应变先增大后减少,随着时间增长,黏性土中格栅应变沿全长发展并均有相应增长;受模型槽挡板与填料间的摩擦以及加载板与模型槽间存在间隙的影响,靠近两侧挡板筋材的应变值要比中间测点小些;相同位置处挡墙后最大水平土压力监测值约为朗肯主动土压力计算值的2倍;竖向土压力最大值仅为考虑顶部载荷和自重后应力总和的1/3左右,表明格栅加筋使挡墙填土中应力得以重新分布。Based on experimental research on long-term performances of geosynthetics-reinforced earth retailing walls, comprehensive study of strains of geogrid, lateral deformation of panel and earth pressure at the stages of filling, loading and continuing measurement is carried out, and scale effect of model chamber on geogrid＇s strain is analyzed. The tests results show that the strains of geogrid increase with time and then have a tendency to become stable after enduring 6 months. As distance from panel increases, the strains of geogrid increase firstly following by decrease slowly; and then geogrid＇s strains in cohesive soil develop and increase along the length of geogrid with time changing. Besides, due to the effect of chamber-soil friction and small gap between loading plate and chamber, the measured values of strain for middle rib are larger generally than strain values for lateral rib. Finally, horizontal earth pressure behind retaining wall is twice as large as earth pressure calculated by method of Rankine; and the maximum value of vertical earth pressure only account for 1/3 of the summarization value considered load and dead-weight of soil, which showed the geogrid used for reinforcement will significantly induce the redistribution of stresses in backfill.

关 键 词：土工格栅 加筋黏性土挡墙 模型槽 长期性能 

分 类 号：TU411[建筑科学—岩土工程]