液压夯实法补强台背路基模型试验研究  

Research on Model Test of Hydraulic Compaction Method for Strengthening Subgrade on Abutment Subgrade

作　　者：姬猛 张志鹏 陈策策 周志军[2,4] JI Meng;ZHANG Zhi-peng;CHEN Ce-ce;ZHOU Zhi-jun(CCCC Second Highway Engineering Co.Ltd.,Luoyang 471013,China;School of Highway,Chang'an University,Xi’an 710064,China;China Highway Engineering Consultants Corporation,Beijing 100089,China;Xi'an Highway Engineering Testing Center,Xi’an 710064,China)

机构地区：[1]中交二公局第四工程有限公司,洛阳市471013 [2]长安大学公路学院,西安市710064 [3]中国公路工程咨询集团有限公司,北京市100089 [4]西安长大公路工程检测中心,西安市710064

出　　处：《公路》2020年第11期1-9,共9页Highway

基　　金：国家自然科学基金项目,项目编号51878064。

摘　　要：设计并进行了足尺模型试验,通过采集动态土压力数据,就液压夯实法补强桥台背路基时对桥台背的动力影响与夯击能量传播规律进行了分析。研究结果表明:夯击作用的水平向影响范围小;夯击作用对浅层路基土体主要产生竖向冲击作用,对深层土体主要产生侧向挤压作用;夯击能量在土体中呈负幂指数关系衰减,夯击次数的增加会导致动态土压力增长;在连续夯击作用下路基表层会形成“硬壳层”,对夯击能量的传播产生阻隔作用,使有效影响深度减小。In this paper,a full-scale model test is designed and carried out.By collecting the dynamic earth pressure data,the dynamic influence on the abutment subgrade and the propagation law of compaction energy are analyzed.The results show that the horizontal influence range of compaction is small;the compaction mainly produces vertical impact on the shallow subgrade soil and lateral compression on the deep soil;the compaction energy decreases in the negative power exponential relationship in the soil,the increase of tamping times will lead to the increase of dynamic soil pressure,and the"hard shell layer"will be formed on the surface of the subgrade under the continuous tamping,which has barrier effect on the propagation of ramming energy,and the effective influence depth is small.

关 键 词：路基工程 液压夯实法 台背 补强 模型试验 

分 类 号：U416.1[交通运输工程—道路与铁道工程]