基于侵蚀理论的强夯效果数值模拟分析  

Numerical simulation and analysis of intensive ramming effect based on erosion theory

作　　者：但慧娟[1,2] 郑明新[1] 

机构地区：[1]华东交通大学道桥与岩土工程研究所,江西南昌330013 [2]中国中铁建工集团,北京100164

出　　处：《兰州理工大学学报》2013年第2期121-125,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金项目(51068006)

摘　　要：基于侵蚀理论,采用LS-DYNA的显式中心差分非线性动力学分析方法,结合现场试验,探讨不同地基特征点的塑性区、应力、位移及振动特性的动力响应.根据动力响应时程曲线,评价锤底应力、水平加固范围、竖直加固深度、振动特性和施工安全距离,得出纵波、横波、瑞雷波在强夯加固中所起的作用.在1 500kN.m夯击能下加固形体类似苹果状,水平影响范围为3.5m,竖直方向各点应力较水平方向衰减快.Based on the theory of erosion and by using the method of LS-DYNA explicit central difference nonlinear dynamic analysis, the dynamic responses of plastic zone, stress, displacement and vibration characteristics at different characteristic points in the foundation were explored on the base of field experi- ment. The rammer bottom stress, scope of horizontal reinforcement, depth of vertical reinforcement, vi- bration characteristics, and constructional safe distance were evaluated, according to the time history curve of the dynamic response, and the role of the longitudinal waves, transverse wave and Rayleigh wave in in- tensive ramming consolidation was determined. Under the condition of 1 500 kN ·m ramming power, the shape of the pier body would be similar to that of an apple, horizontal impact width 3. 5 m, and the stress of all points in vertical direction would decay faster than that in horizontal direction.

关 键 词：侵蚀理论 强夯效果 动力响应 数值模拟分析 

分 类 号：TU470.3[建筑科学—结构工程]