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基于考虑初始半径的圆孔扩张理论,并根据旁压试验临界深度的形成机制与沉桩挤土的相似性,求得沉桩土体隆起的分界面,并进一步推导了沉桩引致地表隆起的曲线方程,分析了预钻孔半径对土体隆起的影响规律。由于初始半径即为沉桩施工时较为常用的预钻孔半径,因此,推导的预估土体隆起的有关方程为通用公式,当初始半径取0时,可用于普通沉桩的土体隆起分析。实际计算表明,该公式计算结果略小于实测值,但比有限元模拟的结果更接近实测值。因而提出的沉桩导致土体隆起的预估公式是简洁而实用的。
Based on the theory of circular hole expansion considering the initial radius and according to the similarity of the formation mechanism of the critical pressure and the pile squeezing, the interface of the pile uplift is obtained and the ground uplift induced by pile driving is further deduced Curve equation, analyzed the influence law of pre-boring radius on soil bulge. Because the initial radius is the pre-drilling radius, which is commonly used in pile sinking construction, the equation for estimating soil bulge is general formula. When the initial radius is 0, it can be used to analyze soil bulge of ordinary pile sinking . The actual calculation shows that the formula is slightly less than the actual measured results, but the results than the finite element simulation closer to the measured value. Therefore, the proposed formula of pile sinking leading to soil uplift is concise and practical.