摘要
为了探讨土石比及大粒径块石对碎块石土强夯加固效果的影响规律,对3组不同土石比条件下碎块石土强夯地基的瑞利波检测数据进行了对比分析。夯后波速曲线具有明显的突变性,并随着土石比的减小其突变程度增强,突变段与大粒径块石有较好的对应性。波速增加比例曲线具有垂直分区特征,土石比对强夯加固区厚度影响较大。大块石对周边土体存在较强的扰动作用,夯后波速曲线往往表现为突然锐减,特别是当其位于夯后场地表层或较多大块石距离较近时表现更加明显。当大块石位于强加密区内时,加固深度随着大块石埋深增加而减小,且其埋深越靠近波速增加峰值点时加固深度越浅。研究成果对碎块石填土强夯地基的设计和施工具有参考价值。
The Rayleigh wave velocity of dynamic compaction foundation which comprises detritus soil is tested under three groups of different soil-rock ratios to research soil-rock ratio and large size rock block influence on reinforcing effect.The curves of wave velocity after dynamic compaction present obvious catastrophe characteristics,which are enhanced with soil-rock ratio reduction,and its catastrophe segment is consistent with location of large size rock block.The curves of its wave velocity increasing proportion present vertical partitioning characteristics;and the soil-rock ratio influences more on reinforced thickness.The surrounding soil of large size rock block is strongly disturbed;and the wave velocity sharply reduced;especially located near the site surface or much large rock blocks.The reinforced depth is reduced with increasing buried depth of large size rock block which located in strong encryption zone,and it gets more shallow when its buried depth closer to the peak value of wave velocity.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2012年第10期3067-3072,共6页
Rock and Soil Mechanics
基金
教育部创新团队发展计划(No.IRT1045)
中国博士后科学基金面上项目(No.20080440703)
中国博士后科学基金特别资助项目(No.201003315)
关键词
强夯地基
碎块石土
土石比
瑞利波
大粒径块石
dynamic compaction foundation
detritus soil
soil-rock ratio
Rayleigh wave
large size rock block
