大直径扩底灌注桩的沉降计算方法修正  

A Modified Settlement Calculation Method of Large-diameter Belled Cast-in-place Piles

作　　者：高盟[1,2] 晁明颂 张继严 

机构地区：[1]山东科技大学土木工程与建筑学院,山东青岛266590 [2]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2017年第3期57-62,共6页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：山东科技大学科研创新团队项目(2015KYTD104)

摘　　要：基于压缩模量随深度而增大的事实,取土体微单元进行受力分析,引入深度对压缩模量的影响,建立室内压缩模量与变形模量的关系,代入扩底桩沉降计算公式,得出扩底桩沉降计算修正公式,用于工程实例的沉降计算。与修正前的沉降计算公式相比,修正公式所得结果与工程实测沉降更吻合。数值计算结果也表明,考虑压缩模量深度效应的计算结果与实测结果更接近。说明提出的扩底桩沉降计算修正公式更合理、适用。Based on the fact that the compression modulus increases with depth, the existing settlement calculation formula of large-diameter belled cast-in-place piles was modified. The relationship between compression modulus and deformation modulus was established by taking the differential element of soil for stress analysis and introducing the effect of depth on compression modulus. By substituting it into the existing settlement calculation formula,a modified settlement calculation formula was obtained and was applied to the calculation of engineering project. Compared with the existing settlement calculation formula, the results of the modified settlement calculation model showed great agreement with the settlement in an actual project engineering. Numerical results also show that the settlement value considering depth effect of compression modulus is more consistent with the measured results, suggesting that the modified settlement calculation method of is more reasonable and applicable.

关 键 词：扩底灌注桩 深度效应 压缩模量 沉降 计算方法 

分 类 号：TU473.1[建筑科学—结构工程]