强夯饱和砂土地基的有效加固深度计算方法  

Calculation Method of Effective Reinforcement Depth of Saturated Sand Foundations by Dynamic Compaction

作　　者：董天文[1] 高建华 刘伟 何嘉峰 林小庆 Dong Tianwen;Gao Jianhua;Liu Wei;He Jiafeng;Lin Xiaoqing(School of Civil Engineering,Liaoning Technology University,Fuxin Liaoning,123000,P.R.China;Shen Kan Engineering&Technology Corporation,Shenyang 110167,P.R.China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]中冶沈勘工程技术有限公司,沈阳110167

出　　处：《地下空间与工程学报》2023年第4期1244-1249,1269,共7页Chinese Journal of Underground Space and Engineering

基　　金：辽宁省自然科学基金(20180551140);中冶沈勘科技项目(SKYF1801);辽宁省桥梁安全工程专业技术创新中心开放基金(2021-07)。

摘　　要：近年来,沿海经济和吹填技术发展迅速,围填海区域已形成大面积、大厚度的吹填饱和砂土地基,往往表现出易液化、承载力低的性质,给工程建设带来较大困难。强夯法是一种安全、经济的软弱地基加固方法,但由于饱和砂土地基强夯加固机制复杂,经验公式、数值仿真等方法难以反映客观情况或不便于现场应用,导致有效加固深度的工程设计缺少实用的方法。基于饱和砂土地基的加固机制,建立了考虑夯坑深度、压密壳深度、压密壳影响区深度的有效加固深度计算方法,有效加固深度的估算值与现场试夯检测情况较为吻合,说明本文提出的有效加固深度计算方法能够较为客观地反映饱和砂土地基强夯加固特征,具有较好的工程适用性和可靠性。In recent years,with the rapid development of the coastal economy and hydraulic reclamation technology,the large-scale and large-thickness hydraulic-fill saturated silt fine sand foundations have been formed in the reclamation areas.Such foundations often show the characteristics of easy liquefaction and low bearing capacity,which brings great difficulties to practical project.The dynamic compaction method is a safe and economic method for reinforcing the soft foundations.However,due to the complex mechanism of dynamic compaction of saturated sand foundations,the empirical formula,numerical simulation and other methods are difficult to reflect the objective situation or are not convenient for field application,resulting in the lack of practical methods for the engineering design of effective reinforcement depth.On the basis of reinforcement mechanism,a calculation method of effective reinforcement depth considering the depth of the tamping pit,the depth of compacted shell and the influence area depth of the compacted shell is established.The calculation value is more consistent with the on-site tamping test result,which shows that the calculation method of the effective reinforcement depth proposed in this paper can objectively reflect the reinforcement characteristics of saturated sand foundations under dynamic compaction and has good engineering applicability and reliability.

关 键 词：强夯法 饱和砂土地基 加固机制 有效加固深度 压密壳 

分 类 号：TU472.1[建筑科学—结构工程]