土工格栅加筋石灰土挡墙工程特性试验研究

Field tests on behaviors of geogrid-reinforced lime treated soil retaining walls

以河北省保(定)沧(州)高速公路模块式土工格栅加筋石灰土挡墙为工程依托,以现场原型试验为手段,系统研究了该结构工作状态下的基底竖向土压力、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:基底竖向土压力沿筋长近似呈梯形分布,其大小一般小于理论值,最大值发生在墙背附近,且随竣工后时间的延续有下降的趋势;实测墙背侧向土压力沿墙高呈非线性增长分布,数值小于主动土压力;实测拉筋应变沿筋长呈单峰值分布,且数值均小于0.6%。试验结果可以为类似工程的设计、研究提供参考。

Monitoring of a geogrid-reinforced lime treated soil retaining wall of Baoding-Cangzhou Highway in Hebei Province is carried out by use of field tests.The monitoring includes the vertical foundation pressure and lateral earth pressure of the reinforced soil wall facing and the tensile strain in the reinforcement.The vertical foundation pressure of reinforced soil retaining wall is non-linear along the reinforcement length,and the value is less than the theoretical one and will reduce with the decrease of time.The maximum value of the vertical foundation pressure is near the facing.The measured lateral earth pressure within the reinforced soil wall is non-linear along the height and the value is less than the active lateral earth pressure.The distribution of tensile strain in the geogrid reinforcements within the wall is a single peak value and the value is less than 0.6%.These monitoring results can be used as a reference for future study and design of geogrid-reinforced soil retaining wall systems.