中国地质灾害与防治学报2024，Vol.35Issue(3)：1-11,11.DOI:10.16031/j.cnki.issn.1003-8035.202209035
含构造节理的崩塌体动力破碎特征
Dynamic fragmentation characteristics of rock avalanche with tectonic joints
摘要
Abstract
In recent years,rock avalanche disasters have been occurring frequently in southwest China,which seriously affect the regional ecological environment and human activities.To understand the fragmentation characteristics of the avalanche masses during their movement,this study is based on the field investigation of the rock avalanche in Zongling Town,Nayong County.The dynamic fragmentation process of the rock avalanche during the failure and accumulation stages was simulated using the particle discrete element method.Additionally,the distribution characteristics of the maximum feret's diameter of the fragments within the rock avalanche mass were statistically analyzed.The results show that:(1)Under the effect of gravity,the internal structural joints of the rock avalanche rapidly interconnected,dividing the avalanche mass into numerous fragmented blocks that eventually slid along the down-dip joint surfaces.(2)The collapse exhibited significant fragmentation phenomena in the entire movement process,with extensive disintegration during the initial failure and friction-induced tearing and cracking fragmentation during the accumulation stage.(3)The feret's diameter distribution curves of the fragments at different time intervals were fitted using Weibull two-parameter distribution model and fractal geometry theory.The results showed that the fragmentation degree of the avalanche during the accumulation stage(t=21.7 to 72.4 s)was weaker than that during the initial failure stage(t=0 to 21.7 s).The fractal dimension of the fragments and the proportion of fine-grained fragments continuously increased throughout the entire movement process,once again confirming the fragmentation and disintegration phenomena during the entire process of failure and accumulation.The research findings provide a theoretical basis for revealing the dynamic fragmentation mechanism of the Zongling rock avalanche,and provide scientific guidance for the prevention and control of rock avalanche disasters in the mountainous areas of southwest China.关键词
岩质崩塌/动力破碎/构造节理/弗雷特直径/离散元方法Key words
rock avalanche/dynamic fragmentation/tectonic joints/feret's diameter/discrete element method分类
天文与地球科学引用本文复制引用
臧佳园,常文斌,邢爱国,张耀明,王春玲,金凯平,沈凌铠,于文罡..含构造节理的崩塌体动力破碎特征[J].中国地质灾害与防治学报,2024,35(3):1-11,11.基金项目
国家重点研发计划课题(2018YFC1504804) （2018YFC1504804）
国家自然科学基金项目(41530639) （41530639）
