黄泛区路基强夯时超孔隙水压力变化规律试验研究  

Test study of changing rules of excess pore water pressure during dynamic consolidation at subgrade of expressway in Yellow River flood area

作　　者：李晓静[1,2] 李术才[2] 姚凯[3] 祝少纯 吕国仁[2] 

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]山东大学岩土与结构工程研究中心,济南250061 [3]山东大学土建与水利学院,济南250061 [4]滨州市公路勘察设计院,山东滨州256600

出　　处：《岩土力学》2011年第9期2815-2820,共6页Rock and Soil Mechanics

基　　金：山东省交通科技项目(No.2008Y002)

摘　　要：滨德高速公路所经地区主要由黄河冲积而成,场区地层以粉土和粉质黏土为主。在试验区不同地层深度处埋设孔隙水压力计,通过观测、分析强夯各个过程中超孔隙水压力的变化规律,得出以下结论:在2 000 kN.m夯击能的作用下,第1～2遍夯击时最佳夯击数为8～9击,第3遍夯击时最佳夯击数为6～8击;夯击后,浅层的超孔隙水压力基本均大于深层的超孔隙水压力,消散时间也相对较长,并且浅层孔隙水压力受夯击影响的水平距离较深层的大;在2 000 kN.m夯击能的作用下,强夯最大影响深度为8～9 m,有效加固深度为6～8 m,有效加固深度系数α=0.134～0.179;6～7 m深处孔隙水压力水平最大影响距离小于10 m,有效影响宽度基本为5～7 m。The subgrade of Binde Expressway mainly consist of silt and silty clay.The dissipation rule of excess pore water pressure could reflect the reinforcement effect of soil.Pore water pressure gauges were embedded in the test section.By analyzing the changing rules of excess pore water pressure,some conclusions are drawn as follows.When the test section is striked by the tamping energy of 2 000 kNom,the best hitting number is 8-9 during the first and second passes;the best hitting number is 6-8 during the third pass.The excess pore water pressure of shallow place is higher than that of deeper place;and the excess pore water pressure of shallow place dissipated slowly.The maximum impacting depth is 8-9 m and the effective impacting depth is 6-8 m;the ratio of the effective impacting depth is 0.134-0.179.The maximum horizontal impacting distance is less than 10 m,and the effective horizontal impacting distance is about 5-7 m.

关 键 词：强夯 超孔隙水压力 试验研究 最佳夯击数 有效加固深度 

分 类 号：TU472[建筑科学—结构工程]