加筋挡土墙在膨胀土地区应用的研究分析  

Research and Analysis on Application of Reinforced Earth Retaining Wall in Expansive Soil Area

作　　者：程新星[1] 戚长军[1] 赵星纬[1] 

机构地区：[1]机械工业勘察设计研究院

出　　处：《水利与建筑工程学报》2010年第4期169-173,共5页Journal of Water Resources and Architectural Engineering

摘　　要：结合某变电站基础工程,对膨胀土加筋挡土墙开展了一系列的现场试验研究。试验结果表明：在填筑高度较小的情况下,墙背土压力增加较快,实测竖向土压力大于γh,土压力系数逐渐增大;而随着填土高度的增大,实测竖向土压力逐渐开始收敛并小于γh,土压力系数也逐渐降低。降雨导致竖向土压力和侧向土压力均降低,但土压力系数增大。大型膨胀土填土工程会产生较大的变形,且变形收敛速率缓慢。筋带的存在有效地抑制了挡土墙的侧向变形和竖向沉降。施工中,挡土墙的排水问题和防水处理对抑制挡土墙变形及不均匀沉降具有非常重要的作用。本文的研究对在膨胀土地区采用加筋挡土墙的合理性和有效控制影响工程质量的因素有重要的参考价值。Based on the foundation works of a certain transformer substation,the field test researches have been made for the reinforced earth retaining wall of expansive soil.The earth pressure,lateral displacement and strain in different points of reinforced belt have been measured in situations.It is shown that the earth pressure increases quickly with filling height,the vertical earth pressure in situ is greater than γh,and the coefficient of earth pressure is gradually enhanced when the filling height is low.With the increasing of filling height,the vertical earth pressure is gradually convergent and less than γh,in the mean time,the coefficient of earth pressure is also gradually decreased.In the course of rainfall,both the horizontal and vertical earth pressure are smaller than those measured before the rainfall.The horizontal and vertical deformations are effectively restrained by reinforced strips.The drainage and waterproofing treatment will be of great worth to restrain deformations and uneven settlements of the retaining wall.The field test results mentioned here are useful for the construction of reinforced earth retaining wall in expansive soil areas.

关 键 词：膨胀土 加筋挡土墙 土压力 

分 类 号：TU443[建筑科学—岩土工程]