岩土力学2024，Vol.45Issue(2)：407-416,432,11.DOI:10.16285/j.rsm.2023.0262
单向冻结粉质黏土已冻区分凝冰分布规律试验研究
Experimental study on segregating ice cracks distribution characteristics in unidirectional frozen silty clay
摘要
Abstract
In the process of unidirectional freezing,the generation and development of segregating ice is an important factor affecting the structural characteristics of frozen and thawed soil.Three unidirectional freezing boundary conditions were selected,i.e.,cooling rate(from 0.5 ℃/s to 0.005 ℃/s),cold temperature(from-30 ℃ to-70 ℃),and water replenishment(no water replenishment,constant pressure water replenishment)to explore their influence on the development of segregating ice.To facilitate the measurement of segregating ice,an independent meso-measurement system has been developed using optical microscope digital photography.This system enables in-situ and non-contact measurement of segregating ice cracks.The experimental results demonstrate the following findings:(ⅰ)The distribution of segregating ice is not only influenced by temperature gradients and warm end replenishment conditions,but also by the cooling rate at the cold end of the unidirectional freezing process.(ⅱ)The width of the segregating ice in the frozen area is more significantly affected by the movement rate of the frozen front than by the temperature gradient.(ⅲ)During the freezing process,the width of the frozen ice exhibits an exponential relationship with the movement rate of the 0 ℃ line.Based on this characteristic,an empirical formula is proposed to predict the crack width of segregating ice in the frozen zone.This formula can be used as a reference for evaluating unilateral frost heave failure in practical engineering construction,particularly under conditions of varying cooling rates.关键词
单向冻胀/降温速率/黏土/分凝冰裂纹/超低温Key words
unilateral frost heaving/cooling rate/clay/segregating ice cracks/ultra low temperature分类
建筑与水利引用本文复制引用
王震,朱珍德,胡家豪,周子玉..单向冻结粉质黏土已冻区分凝冰分布规律试验研究[J].岩土力学,2024,45(2):407-416,432,11.基金项目
国家自然科学基金(No.41831278) （No.41831278）
汕头大学科研启动基金(No.NTF21015).This work was supported by the National Natural Science Foundation of China(41831278)and the Start-up Fund for Scientific Research of Shantou University(NTF21015). （No.NTF21015）
