碱渣改性泥岩包边土对泥岩路堤的渗流特征影响  

Impactof Mudstone with Soda Residue as Tipping Soil on Percolation Characteristics of Mudstone Embankment

作　　者：魏连雨 檀奥龙 王清洲 TAN Aolong;WEI Lianyu;WANG Qingzhou(School of Civil Engineering and Transportation,Hebei University of technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《公路工程》2018年第4期215-219,277,共6页Highway Engineering

基　　金：河北省高等学校科学技术研究项目(ZD2014099)

摘　　要：以承德平泉地区的泥岩高填方路堤为模型,采用饱和-非饱和土渗流理论,研究了降雨条件下碱渣改性泥岩土作为包边材料时泥岩路堤内部渗流特征,并对碱渣改性泥岩土的抗渗机理进行分析。结果表明:碱渣改性后的泥岩土与黏土均具有一定抗渗能力,且前者抗渗效果更佳;降雨对路堤内的孔隙水压力在水平方向的影响深度与特征剖面的高程成反比,在坡底拐角处达到最大;碱渣改性泥岩作为包边土时最佳包边设计厚度为2 m;碱渣改性后的泥岩微观结构更加致密、孔隙率降低,从而抗渗能力得到提高。Based on the model of embankment with high fill of mudstone in Pingquan area,Chengde,the percolation theory of saturated-unsaturated soil was used to study the seepage characteristics of mudstone embankment under the condition of rainfall.The anti-seepage mechanism of modified mudstone is analyzed.The results show that both mud-rock mixed soil and clay with modified alkali caustic have certain impermeability and the anti-seepage effect of the former is better.The influence of rainfall on the horizontal pressure of pore water pressure in the embankment is inversely proportional to elevation.The maximum capping design thickness of caustic modified mudstone as packed soil is 2 m.The mudstone structure modified by caustic sludge is denser and the porosity is lower,so the impermeability is improved.

关 键 词：泥岩路堤 渗流分析 包边土 碱渣改性泥岩 孔隙水压力 

分 类 号：U416.1[交通运输工程—道路与铁道工程]