弱膨胀土加筋挡土墙现场试验研究

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。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。进而，根据实测结果认为加筋挡土墙是稳定的。

Field Test Research of Reinforced Earth Wall for Expansive Soil

Based on the reinforced earth wall project of a transformer substation,field test was conducted. The earth pressure, lateral displacement and strain in different point of reinforced belt were measured in situ. It was shown that earth pressure increase quickly with filling height,vertical earth pressure in situ was greater than γh and coefficient of earth pressure was gradually enhanced when the fill height lowdown. Along with the increasing of fill height, vertical earth pressure is convergent and less than γh. In the mean time coefficient of earth pressure was gradually decreased. In the course of rainfall, the horizontal and vertical earth pressure was smaller than that measured ones before rainfall. The horizontal and vertical deformations were effectively restrained by reinforced strips. The result indicates that reinforced earth wall is stable. The field test results are useful for reinforced earth wall construction.