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为研究模块面板式土工格栅加筋土挡墙在墙顶局部荷载作用下的受力和变形状态,并了解其作用机制,通过室内模型试验,进行了包括墙面水平变形和墙顶竖向沉降以及墙体内垂直和水平土压力、附加应力扩散角、侧向土压力系数、土工格栅拉伸应变等分布规律的研究和分析。试验结果表明:墙面累积水平位移沿墙高呈上大下小分布;水平和垂直土压力沿筋长方向均呈从拉筋中部向两端逐渐减小的分布趋势;实测附加应力扩散角较非加筋土体大,基本在40°~75°之间;侧向土压力系数沿墙高的分布在不同断面有所不同;筋材应变沿筋长呈单峰值分布,峰值出现位置距墙脚的水平距离从高到低逐渐减小。
In order to study the stress and deformation state of the module-type geogrid-reinforced soil retaining wall under the local load of the wall top, and to understand its mechanism of action, the horizontal deformation of the wall and vertical orientation of the wall were performed through indoor model tests. Settlement and the study of vertical and horizontal soil pressure in the wall, the additional stress diffusion angle, the lateral earth pressure coefficient, the tensile strain of the geogrid, etc. The test results show that the cumulative horizontal displacement of the wall surface is higher and lower along the height of the wall; horizontal and vertical earth pressures tend to decrease along the length of the tendons from the middle of the reinforcement to the two ends; the measured additional stress diffusion angle The non-reinforced soils are large, basically between 40° and 75°; the distribution of lateral earth pressure coefficient along the wall height is different at different sections; the length of the strain along the ribs of the reinforcement is single-peak, and the peak appears from the foot of the wall. The horizontal distance gradually decreases from high to low.