摘要
对于绕轴崩塌为主的荆江二元结构河岸稳定性计算,土体抗拉特性具有重要意义。采取现场挖空方法,开展了间接测定荆江段黏性河岸土体抗拉特性的原型崩塌试验。通过现场测量得到荆江河岸绕轴崩塌时的临界悬空宽度,计算了不同含水率及干密度下土体的抗拉强度;分别计算了荆江和Fukuoka试验河岸土体的临界悬空宽度,并与实测结果进行了对比,计算值与实测值均符合较好。考虑不同河道水位下河岸土体的含水率、抗拉强度、容重等变化过程,对下荆江荆133断面稳定性进行了计算,计算结果与崩岸发生时间的实际统计一致,表明提出的土体抗拉强度及其计算方法的可靠性,为后续河岸崩塌过程的模拟提供了科学的依据。
A series of field experiments has been conducted to investigate the tensile characteristics of cohesive bank soils in the Jingjiang Reach by digging different overhanging soil blocks. Values of tensile strength were calculated under different water contents and dry densities of cohesive soil according to the critical overhang width measured in the field tests. Based on the calculated results,the changes of tensile strength under different water contents and dry densities were obtained. Critical overhang widths of cohesive soil were calculated respectively for the Jingjiang riverbank and the riverbank of Fukuoka’s experiment using the measured values of tensile strength,which were compared with the measured data. Results indicate that the calculated and measured values are in good agreement. Stability degrees of the left riverbank at the section of Jing133 during the 2007 hydrological year were calculated,considering the changes of water content,tensile strength and density of cohesive under different water levels. The calculated results correspond to the recent statistics of field investigation of bank erosion,which indicates that the method of tensile strength can be used to calculate the bank erosion processes.
作者
宗全利
夏军强
邓珊珊
彭玉明
ZONG Quan-li;XIA Jun-qiang;DENG Shan-shan;PENG Yu-ming(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;College of Water Conservancy and Arehiteetural Engineering, Shihezi University, Shihezi 832000, China;Bureau of Hydrology, Changjiang Water Resources Commission, Jingzhou 434020, China)
出处
《泥沙研究》
CSCD
北大核心
2018年第2期7-14,共8页
Journal of Sediment Research
基金
国家重点研发计划课题(2016YFC0402303)
国家自然科学基金项目(51579186,51569029,51725902)
关键词
黏性土河岸
抗拉强度
绕轴崩塌
荆江
cohesive bank soil
tensile strength
cantilever failure
Jingjiang Reach
