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以山西某段公路的双级台阶式土工格栅加筋土挡墙工程为实例,在第一级挡土墙加筋竖向间距、拉筋长度等设计参数理论计算的基础上,提出6种不同设计方案,运用可视化岩土工程计算软件Visual Slope 6.0对上、下级加筋土挡墙的最小整体稳定系数、基底滑移稳定安全系数、倾覆稳定安全系数、地基承载力安全系数和拉筋受力等进行了分析和研究,并最终确定了上、下级挡墙加筋间距分别为0.6m、0.3m时不等长布筋的最优设计方案。监测结果表明,该加筋土挡墙背侧向土压力一般介于静止土压力与主动土压力之间,墙内垂直土压力的实测值与理论计算值存在一定差别,且大于理论值的0.5~1.0倍。算例表明通过优化设计使加筋土挡墙的设计更为合理可靠,有助于达到安全节省的设计目标,为类似挡墙的设计提供了指导和借鉴。
Taking a two-stage stepped geogrid-reinforced earth retaining wall project of a section of highway in Shanxi as an example, based on the theoretical calculation of the design parameters such as the vertical spacing and the length of reinforcement in the first retaining wall, six kinds of According to different design schemes, the minimum integral stability coefficient of the upper and lower reinforced earth retaining walls, the safety factor of the base slip, the safety factor of overturning, the safety factor of the bearing capacity of the foundation and the tensile strength Force and so on were analyzed and studied. Finally, the optimal design scheme of the reinforcement with unequal length of 0.6m and 0.3m when the upper and lower retaining walls were reinforced was finally determined. The monitoring results show that the earth pressure on the backside of the reinforced earth retaining wall is generally between the static earth pressure and the active earth pressure. There is a certain difference between the measured value of the vertical earth pressure and the theoretical value in the wall, which is larger than the theoretical value of 0.5 ~ 1.0 times. The example shows that the design of reinforced earth retaining wall is more reasonable and reliable through optimization design, which can help to achieve the safety-saving design goal and provide guidance and reference for the design of similar retaining wall.