紧邻高边坡道路基坑土压力的能量法分析

Analysis of Earth Pressure on Foundation Pit Adjacent to High Slope by Energy Method

基于能量法原理,明确场地斜坡不利作用下紧邻边坡进行基坑开挖时的主动土压力,并提出一种适用于紧邻边坡条件下的基坑土压力计算模型,通过数学推导,得出主、被动土压力计算公式。同时,以郴州某公路基坑工程为例,采用能量法原理以及数值模拟分别计算土压力,对比计算结果,检验能量法计算公式的准确性。研究结果表明:两种方法边坡各位置的主动土压力计算结果差距在5%以内,被动土压力计算结果一致;数值模拟结果较于能量法结果偏小,最大误差不超过10%,表明该计算公式基本正确;同时,研究表明坡高和倾角的增加均使得主、被动土压力增大,被动土压力较主动土压力受边坡倾角的影响更为明显。

Based on the principle of energy method, this paper defines the active earth pressure when the foundation pit is excavated next to the slope under the adverse effect of the site slope, and puts forward a model for calculating the earth pressure of the foundation pit next to the slope. Through mathematical deduction, formulas for calculating active and passive earth pressure are obtained. Taking a highway foundation pit project in Chen Zhou as an example, the results of earth pressure is calculated and compared by energy method and numerical simulation respectively to verify the accuracy of the formula of energy method. The results show that the difference between the two methods is less than 5%, and the results of passive earth pressure are consistent. The result of numerical simulation is smaller than that of energy method, and the maximum error is less than 10%. At the same time, the research shows that the passive earth pressure increases with the increase of slope height and inclination. And the passive earth pressure is more obviously affected by the slope inclination than the active earth pressure.