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以刚性基础上双级土工格栅加筋土挡墙为工程依托进行了现场原型试验研究,分析了施工期及竣工后1.5年期间各级挡墙加筋体底部竖向土压力、墙面板背部侧向土压力和土工格栅拉筋应变分布规律。试验结果表明:刚性基础上加筋体底部垂直土压力沿筋长方向由均匀等值分布变化到呈曲线型分布,最大值靠近墙面位置。柔性基础上加筋体底部垂直土压力沿筋长呈非线性分布,最大值靠近拉筋尾部。竣工后加筋体底部垂直土压力分布形式基本不变。施工期间加筋土挡墙墙背侧向土压力沿墙高呈曲线分布,且随上覆填土厚度的增加而增大,数值增长速率逐渐减小。墙背侧向土压力远小于主动土压力,竣工后其值随时间延续逐步减小。施工期各测试层位拉筋应变基本上随上覆填土厚度的增加而增大,应变沿筋长方向呈双峰值的非线性分布,各测试层位土工格栅拉筋实测应变最大值均小于0.4%,竣工后拉筋应变基本无明显变化。试验结果可以为类似结构工程提供参考。
Based on the rigid foundation reinforced geogrid reinforced earth retaining wall for the project based on the prototype test research, analysis of the construction and completion of 1.5 years after completion of the retaining wall at all levels of vertical earth pressure at the bottom of the wall panel back Lateral earth pressure and strain distribution of geogrids. The test results show that the vertical earth pressure at the bottom of the stiffened body changes from a uniform equivalent distribution to a curved distribution along the length of the stiffener, and the maximum value is close to the wall surface. The vertical earth pressure at the bottom of the stiffened body is nonlinearly distributed along the length of the stiffener on the basis of flexibility, and the maximum value is close to the tail of the tie bar. Upon completion, the vertical earth pressure distribution at the bottom of the reinforced body remains basically unchanged. During the construction period, the earth pressure on the backside of the reinforced earth retaining wall is curved along the wall height and increases with the increase of the overburden thickness, and the numerical growth rate decreases gradually. The earth pressure on the back of the wall is far less than the active earth pressure, and its value gradually decreases with time after the completion. During the construction period, the tensile strain at each test level basically increases with the increase of the overburden thickness. The strain distribution has a bimodal distribution along the longitudinal direction of the reinforcement. The maximum measured strain at each test level of geogrids Less than 0.4%, after the completion of the tension strain basically no significant change. The test results can provide a reference for similar structural engineering.