涉水岸坡的水土溶蚀作用机理及其试验研究  

Mechanism and Experimental Study of Water and Soil Dissolution of Wading Bank Slopes

作　　者：李庆伟 晏鄂川[1] 杨广[1] 陈前 卓琦斐 LI Qingwei;YAN E’chuan;YANG Guang;CHEN Qian;ZHUO Qifei(Faculty of Engineering,China University of Geosciences (Wuhan),Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2019年第1期35-41,共7页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41672313)

摘　　要：涉水岸坡的水土作用问题非常复杂,涉及的研究领域众多。通过对巫山县某涉水岸坡的现场调查,基于对现场水土溶蚀现象的分析,从溶解与沉淀作用、交换与吸附作用、氧化还原作用、水解与络合作用四个方面对涉水岸坡水土溶蚀作用的机理进行论述,通过一维土柱试验模拟现场岸坡环境,对涉水岸坡钙质沉积胶结的成因进行研究。结果表明:HCO_3^--Ca^(2+)型岩溶水在粗细互层的土柱中运移时,水中的钙质会在渗透系数相差较大的两层介质交界面上聚集,并会降低土层的渗透性。该研究可为三峡库区涉水岸坡水土作用机理的研究提供借鉴和参考。The problems of soil and water action of wading bank slopes are very complex and involve many fields.Based on the field investigation of a wading bank slope in Wushan County and the analysis of the phenomenon of soil and water dissolution in the field,this paper expounds the mechanism of soil and water dissolution from four aspects,dissolution and precipitation,exchange and adsorption,oxidation and reduction,and hydrolysis and complexation.Furthermore,one-dimensional soil column experiment is conducted to simulate field geological environment.The paper studies the causes of calcareous sedimentary cementation of wading bank slopes.The results show that when HCO3^--Ca^2+karst water migrate in the soil column with interbedded thickness,the calcium in the water can gather in the interface of two-layer medium that have great difference in the permeability coefficient,which can reduce the permeability of the soil layers.The paper provides a reference for the mechanism study of water and soil action of similar wading bank slopes.

关 键 词：涉水岸坡 水土溶蚀 作用机理 钙质沉积胶结 试验 

分 类 号：X43[环境科学与工程—灾害防治] P642.25[天文地球—工程地质学]