强夯加固粉土地基超孔隙水压力增长规律研究  

Research on growth law of excessive pore water pressure in silty subsoil consolidated by dynamic compaction

作　　者：张宏博[1,2] 厉超[1,2] 陈晓光[1] 宋修广[1,2] 李红超[3] 

机构地区：[1]山东大学土建与水利学院,山东济南250061 [2]山东省路基安全工程技术研究中心,山东济南250061 [3]河南省地质矿产勘查开发局第三地质勘查院,河南洛阳471023

出　　处：《铁道建筑》2015年第8期101-104,共4页Railway Engineering

基　　金：国家自然科学基金项目(51208284);山东省科技发展计划项目(2013GSF11603)

摘　　要：黄河冲积平原地层以粉土和粉质黏土为主,为研究该地区强夯加固地基的超孔隙水压力增长规律,进行了强夯现场试验。通过对超孔隙水压力的现场监测及试验结果的统计分析得出:夯击次数和地层埋深影响超孔隙水压力增长规律;其增长模式符合指数曲线模型,基于该模型推导出的超孔隙水压力增长计算公式经验证是合理的;随着夯击次数增加,浅层土体最先出现液化,随后液化区域逐渐加深;地下水位较高时,可以实施降水以降低临界液化深度,从而实现连续多次夯击。As silt and silty clay dominate the terrain of the Yellow River alluvial plain, the paper carries out in-situ experiment on the dynamic compaction results, aiming to unveil the growth law of excessive pore water pressure on the dynamic-compacted subsoil. Thanks to the monitor effort and the experimental data collected, the following results arrive：Tamping times and stratum depth stand as two relevant factors, whose relation with the water pressure can be depicted by exponential model. The paper then concludes the function accordingly and verifies its validity. In the experiment, it has been noticed that as the compaction carries forward, liquidation first takes place at the shallow soil and then goes down gradually. Given that the water level can be relative high, the endeavor to lower the water level needs to be carried to undermine the liquidation depth, therefore multiple compaction can be released.

关 键 词：强夯 粉土地基 超孔隙水压力 增长规律 

分 类 号：TU475.3[建筑科学—结构工程]