长江科学院院报2024，Vol.41Issue(6)：136-142,7.DOI:10.11988/ckyyb.20221706
干湿循环作用下渠道膨胀土裂隙演化规律及强度特性
Fracture Evolution and Strength Characteristics of Channel Expansive Soil under Wetting-Drying Cycles
摘要
Abstract
To investigate crack evolution characteristics and strength degradation patterns of expansive soil channel slopes subjected to dry-wet cycles,we conducted cyclic dry-wet tests on expansive soil with varied compactness from a channel in northern Xinjiang.Surface crack parameters were extracted using image processing technology,while shear strength was determined via direct shear testing.The relationship between cohesion and crack rate was analyzed.Our findings indicate that,under cyclic drying and wetting,cohesion decay accelerates with higher com-paction,while internal friction angle generally decreases.The increase in crack rate slows as compaction rises.The relative crack area initially increases,followed by a decrease.Finally,we established a relationship between cohe-sion and surface crack rate through fitting.This enables the calculation of expansive soil's cohesive force based on its surface crack rate.The research findings provide crucial insights into understanding the instability and failure of expansive soil channel slopes under severe dry-wet fluctuations.关键词
输水渠道/膨胀土/干湿循环/裂隙演化/抗剪强度Key words
water delivery channel/expansive soil/wetting-drying cycles/fracture evolution/shear strength分类
建筑与水利引用本文复制引用
杨涛,姜海波,赵海蛟..干湿循环作用下渠道膨胀土裂隙演化规律及强度特性[J].长江科学院院报,2024,41(6):136-142,7.基金项目
国家自然科学基金项目(51769031) （51769031）
兵团区域创新引导计划项目(2021BB004) （2021BB004）
