模块面板式土工格栅加筋土挡墙动态特性试验研究

为了研究模块面板式土工格栅加筋土挡墙在高速铁路列车荷载作用下的动力响应规律，分析其作用机理，结合室内模型试验进行了包括加筋土挡墙墙面变形、墙体加速度、动土压力、残余土压力及土工格栅拉伸应变等分布规律的研究。结果表明：墙面累积水平位移沿墙高呈单峰值分布，最大值位置靠近墙顶；挡墙内竖向加速度受频率影响较大，8 Hz时加速度出现大幅增长，加筋体内加速度沿墙高出现衰减；动土压力主要受荷载幅值及加载次数的影响，在加筋体内沿墙高逐渐衰减，垂直动土压力的衰减速率逐渐增加，水平动土压力的衰减速率逐渐减小；随加载次数的增加，残余土压力逐渐增大，沿墙高墙体中部的残余土压力稍大；筋材累积应变随加载次数的增加略微减小，沿筋长呈单峰值分布，峰值位置距墙脚水平距离从高到低逐渐减小。

Test research on dynamic characters of geogrid reinforced soil retaining wall with concrete-block panel

In order to research the behaviors of geogrids reinforced soil retaining wall with concrete-block panel under the traffic loads of high speed railway, and analyze the mechanism. A series of researches, including the deformation of wall face, the accelerated velocity, the dynamic soil pressure, the residual soil pressure and the tension strain of geogrids, have been done through the model test in laboratory. Test results showed that, the cumulative lateral displacement of wall face performed a distribution of single-peak, and the position of max-value was close to the top of wall. The vertical accelerated velocity was mainly impacted by load frequency and increased largely when the frequency turned to 8 Hz, and it was attenuated in reinforcement body. The dynamic soil pressure was mainly impacted by load amplitude and load cycle number and performed the trend of attenuation down the wall height, the attenuation rate of vertical dynamic soil pressure gradually increased and that of horizontal dynamic soil pressure gradually decreased. With the increase of load cycle number the residual soil pressure increased gradually, and it was a little bigger in the middle portion along the wall height. The cumulative strain of the geogrid decreased slightly with the increase of load cycle number, and performed the distribution of single-peak along the geogrid length. The horizontal distance from the position of peak to the wall foot gradually decreased down the wall height.