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近年来钻孔灌注桩作为一种支护结构在深基坑开挖中得到了越来越广泛的应用。护坡桩的存在,改善了箱基侧墙填土土压力的分布状态,有效地减少了箱基侧墙土压力。本文根据经典土压力理论,分析了护坡桩与箱基间填土的受力状态,导出了侧向主动土压力基本公式,通过数理统计方法给出了便于设计人员使用的侧向土压力护坡桩影响系数公式。箱基与护坡桩间填土土压力分布及其合力、合力作用点、箱基弯矩等,只需将不考虑护坡桩影响的计算结果乘以相应的影响系数后即可求得。
In recent years, bored cast-in-place piles as a supporting structure have been more and more widely used in excavation of deep foundation pits. The existence of slope protection piles improves the distribution of earth pressure on the side walls of box foundations, and effectively reduces the earth pressure on the side walls of box foundations. Based on the classical earth pressure theory, this paper analyzes the stress state of the filling between the slope protection piles and the box foundation, and derives the basic formula of the lateral active earth pressure. The lateral earth pressure slope protection piles that are convenient for the designers are given by the mathematical statistics method. Influence factor formula. The earth pressure distribution of the earth pressure between the box foundation and the slope protection pile and its resultant force, joint action point, box foundation bending moment, etc., can be obtained only by multiplying the calculation result of the slope protection pile by the corresponding influence coefficient.