含水量变化对冻融指标影响试验研究  

Test and Study on Effects of Changed Moisture Content to Indexes of Freezing and Melting

作　　者：董瑞琨[1] 许兆义[2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]北方交通大学土建学院,北京100044

出　　处：《中国水土保持》2003年第8期18-19,25,共3页Soil and Water Conservation in China

基　　金：国家自然科学基金资助项目 (50 0 4 80 2 2 )

摘　　要：我国冻融侵蚀面积 12 5万km2 。将试验土样分两组按一定密度和一定含水量装入试样盒进行试验 ,得出同种土质不同含水量、不同试验条件下的冻胀系数和融沉系数等有关冻融的指标。研究结果表明 :含水量及其变化是影响土体冻融指标的关键因素 ,土体的冻融是一个动态变化的过程。进行冻融侵蚀评价时 ,要充分考虑土质和土壤本身的含水量及冻融过程中的水分补给、环境变化等因素。The area of freezing and melting erosion in China is 1.25 million km 2. The paper divides the test samples into two groups and puts them into sample cases according to a certain density and given moisture content for testing. It obtains the related freezing and melting indexes of coefficients of expansion with freezing and settlement with melting of the same quality and composition of the soil under different moisture content and different testing conditions. The results show that moisture content and its variations are the key factors effect the indexes of freezing and melting of the soil and freezing and melting of the soil are dynamic process. It should fully consider the factors of quality and composition of the soil, moisture content, and moisture content supply during the process of freezing and melting and environmental changes when it conducts evaluation of freezing and melting erosion.

关 键 词：冻融侵蚀 冻胀 融沉 含水量变化 冻融指标 

分 类 号：S157.1[农业科学—土壤学]