软黏土中预钻孔沉桩引起的土体隆起分析  

Analysis of soil heave due to pile-sinking with pre-drilling in soft clay

作　　者：周建武[1] 楼晓明[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土力学》2011年第9期2839-2844,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50978201)

摘　　要：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 cylindrical cavity expansion which considers the influence of initial radius,and according to the similarity between the mechanism of the critical depth of pressuremeter test and the penetration effect of pile-sinking,the interface of soil heave of pile-sinking with pre-drilling is obtained;and then a simple formula to estimate the range and magnitude of soil heave is derived.The law of soil heave due to initial radius of pre-drilling is analyzed.The initial radius is just the pre-drilling one,so the formula is universal to estimate soil heave which derived in this paper.When initial radius is zero,the formula can be used to analyze general pile-sinking.It is demonstrated that the calculated soil heave is less than the measured value,but more close to it than the FEM result.So a simple and practical formula to estimate the range and magnitude of soil heave for the engineering is given.

关 键 词：预钻孔 地面隆起曲线 隆起分界面 临界深度 圆孔扩张理论 

分 类 号：TU443[建筑科学—岩土工程]