强夯法处治湿陷性黄土路基的数值分析及应用  

Numerical analysis and its application of wet-collapsible loess roadbed processed with forceful tamping

作　　者：李金云[1] 吴全雷 王邵臻[1] 张爱卿[3] 刘大刚 

机构地区：[1]北京科技大学天津学院,天津301830 [2]北京红品石咨询投资有限责任公司,北京100044 [3]北京科技大学土木与环境工程学院,北京100083 [4]中交路桥北方工程有限公司,北京100024

出　　处：《兰州理工大学学报》2017年第1期111-115,共5页Journal of Lanzhou University of Technology

摘　　要：针对Ⅲ级自重湿陷性黄土遇水强度降低、变形较大的情况,采用数值模拟和现场试验的手段,分析强夯处治后位移场、应力场和塑性区的变化规律.以某高速公路段为例,设计强夯处治方案,并通过现场夯沉量试验和标准贯入试验,得出强夯处治Ⅲ级自重湿陷性黄土的最佳夯击次数及有效的处治深度.研究表明,强夯单点夯实作用后位移场和应力场重新分布,其有效的水平夯实范围为3m,剪切塑性区体积增大;Ⅲ级自重湿陷性黄土最佳的夯击次数是5次,强夯竖向有效处治深度为4m.数值模拟结果与现场试验数据对比分析结果一致,证明强夯处治方案合理,强夯处治对于Ⅲ级自重湿陷性黄土地基效果显著.Aimed at the condition of low strength and greater deformation of Ⅲ-grade wet-collapsible loess in the presence of water and by means of numerical simulation and field test, the variation pattern of the displacement field, stress field, and plastic zone due to forceful tamping was analyzed. A segment of an expressway was taken as an example to design the plan of the forceful tamping processing and perform the field experiment on tamping-down so that the optimal tamping times and effective tamping depth were obtained for tamping processing of m-grade self-weighted wet-collapsible loess. It was shown by the investigation that the displacement and stress fields would be redistributed after forceful damping at single point, and the effective horizontal tamped range would be 3 m, plastic zone volume of shear would increase, optimal tamping times would be 5, and vertical effective tamping-depth 4 m. The results of numerical simulation and field test would be consistent with each other, thus verifying the reasonableness of the plan of forceful tamping, and its effect was remarkable for m-grade wet-collapsible loess foundation.

关 键 词：强夯 夯沉量 标准贯入试验 Ⅲ级自重湿陷性黄土 数值模拟 

分 类 号：TU413[建筑科学—岩土工程]