台阶式短加筋土挡墙行为特征的离心模型试验

短加筋土挡墙是一种在既有稳定墙体/陡坡前修建的窄加筋土挡墙，目前对其工作机理的研究尚不深入，特别是对短加筋土挡墙内部存在陡坎及增设台阶的情况鲜有研究.本文利用离心模型试验，结合系统的监测数据，对各组模型试验墙顶沉降、墙面水平位移、土压力分布等规律进行了分析，探讨了短加筋土挡墙的行为特征以及中部增设台阶的影响.研究发现:短加筋土挡墙的竖向沉降和水平位移均较常规加筋土挡墙分布偏不均匀；短加筋土挡墙与其后稳定墙体/陡坡接触区域竖向土压力分布存在明显应力集中和应力消散区；中部增设台阶可很好地控制短加筋土挡墙变形，提高整体稳定性；短加筋土挡墙和其后稳定墙体/陡坡之间的压力监测值远小于理论水平土压力值，二者间仅为接触压力. 

Centrifuge Modeling Tests on Behavior of Tiered Shored Mechanically Stabilized Earth Walls

The shored mechanically stabilized earth (SMSE) wall system is kind of narrow MSE walls designed and constructed next to the existing stable walls/slopes. However there are lack of in-depth investigations on the mechanism of SMSE walls, especially on the effects of inside terrace and additional offset between adjacent tiers on SMSE wall system. Utilizing the centrifuge modeling tests of SMSE walls, the measured data including crest settlement, lateral displacement of the facing and the earth pressure in the SMSE walls were analyzed. The results indicate that,compared with conventional MSE walls, SMSE walls have more uneven deformation both on crest settlement and on lateral displacement than conventional MSE walls, and around the inside terrace, unusual stress concentration and dissipation were observed. Adding offset between adjacent layers is an efficient measure to help control the deformation and improve the stability of SMSE wall system. The measured lateral pressure of narrow reinforced soil mass against the stable wall/slope is far below the theoretical active earth pressure, indicating that the stable wall/slope does not add extra lateral pressure to SMSE wall.