摘要
为研究黏土的内部边界与含水率下限对干缩裂隙的影响,本文开展了不同含水率下限的干湿循环试验,并在试验土样内部设置障碍物以模拟实际土体中存在的内部边界。通过计算机视觉方法对试验结果进行处理,对裂隙的发育历程与最终形态进行研究,对裂隙率、裂隙总长度、裂隙平均宽度进行定量分析。结果表明:(1)裂隙的发展受内部障碍物影响显著,根据裂隙的特点可以将裂隙分为沿障碍物发展的裂隙、辐射状裂隙、环状裂隙、细小裂隙与闭合环形裂隙五类;(2)随着含水率的降低,土样的裂隙率增加,裂隙总长度增大,裂隙平均宽度增大;(3)随干湿循环次数的增加,含水率下限越低的组,裂隙率与总长度的增长越明显。
In order to study the effects of internal boundary and lower limit of water content on desiccation cracking of clay,dry and wet cycle experiments were conducted with different lower limits of water content by setting obstacles inside the test soil sample to simulate the internal boundary existing in actual soil.The experimental results were processed by computer vision method,the development history and final morphology of the crack are studied,and the crack ratio,total crack length and average crack width are quantitatively analyzed.The results show that:(1)The development of crack is significantly affected by internal obstacles.According to the characteristics of cracks,they can be divided into five types:crack along obstacles(ring knife),radial crack,annular crack,small crack and closed annular crack.(2)With the decrease of water content,the crack ratio,total crack length and average crack width increase.(3)With the increase of dry and wet cycles,the lower the lower limit of water content,the more obvious the increase in crack ratio and total crack length.
作者
孙海波
丁佳祺
邓云鹏
吕亚歌
高海彦
Sun Haibo;Ding Jiaqi;Deng Yunpeng;Lv Yage;Gao Haiyan(Hangzhou Archaeological Ruins of Liangzhu City World Heritage Monitoring and Management Center,Hangzhou 311113,China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China)
出处
《科技通报》
2024年第5期65-72,共8页
Bulletin of Science and Technology
基金
浙江省文物保护科技项目(2021021)。
关键词
黏土
干缩开裂
干湿循环
内部边界
含水率
clay
desiccation cracking
dry and wet cycles
internal boundary
water content
