摘要
针对红砂岩路基难以压实的特性,采用强夯方法,提高红砂岩路基压实度。基于强夯处理红砂岩路基的现场试验,采用显示动力有限元程序LS-DYNA建立强夯三维模型,对强夯的动力响应进行了数值模拟,研究了强夯作用下红砂岩碎石土路堤的应力-应变变化规律,得到了强夯后土体的应力场、位移场,并与现场试验结果进行了对比,分析了强夯加固红砂岩路基的作用机制及有关夯击参数的取值方法,认为直径为2 m的夯锤在1 200 kN.m夯击能作用下的有效影响深度为4~6 m,锤间距(中心距)不宜大于3.5 m。
Since the uncompressible for red-sandstone embankment, the dynamiic compaction method is used and the 3D FEM model about improving red-sandstone embankment by dynamic compaction is established. The numerical simulation of whole dynamic compaction process is carried out; and the coutours of displacement & stress are obtained with explicit dynamic finite element program ANSYS/LS-DYDA. The results show that the orderliness of stress & strain is quite consistant with the experimental results. The mechanism of improving red-sandstone embankment via dynamic compaction as well as how to determine compaction parameters is also analyzed.Meanwhile,the results show that the effective influence depth is about 4-6 m, and the hammer's contact distance is about 3.5 m, for hammers with tamping-energy is 1 200 kN · m and diameter is 2 m.
出处
《岩土力学》
EI
CSCD
北大核心
2008年第9期2451-2456,共6页
Rock and Soil Mechanics
关键词
强夯
红砂岩路基
数值模拟
现场试验
效果分析
dynamic compaction
red-sandstone embankment
numerical simulation
In-situ experiment
effect analysis