汉中市宁强县凤凰街滑坡运动特征及冲击强度的数值研究  

Numerical Study on Fenghuangjie Landslide Motion Features and Impact Strength in Ningqiang County, Hanzhong City

作　　者：陈兴 魏江波[1] 赵洲[1] Chen Xing;Wei Jiangbo;Zhao Zhou(College of Geology and Environment,Xi an University of Science and Technology,Xi an,Shaanxi 710054)

机构地区：[1]西安科技大学地质与环境学院,西安710054

出　　处：《中国煤炭地质》2021年第7期40-45,共6页Coal Geology of China

基　　金：国家自然科学基金项目(41661144037,41302276);国家重点研发计划(2017YFB0504104)。

摘　　要：为了对正在演化的潜在滑坡开展变形、失稳、运动及冲击致灾过程的超前模拟,以凤凰街滑坡为例,基于PFC3D对降雨诱发滑坡失稳后的位移、速度、能量及冲击力等指标进行了定量研究。结果表明,凤凰街滑坡变形开裂从后缘开始,并逐步向前推进,表现为"后推前"特征,属典型的推移式滑坡;滑坡主滑时间约30s,最大平均运动速度3.3m/s,最大位移约40m;在峰值速度下滑坡动能仅占重力势能减小量的17.5%,碰撞和摩擦耗能始终占据主导地位;滑坡的发生将摧毁下方建筑物,对十几户居民的生命财产安全构成重大威胁。该研究成果可给决策者提供科技支撑,为堆积层滑坡的风险预测提供一定的参考,具有重要的防灾减灾意义。To carry out advanced simulation of evolutive slide potential deformation, instability, motion and impact resulting disaster processes, taking the Fenghuangjie landslide as an example, based on PFC3 D has carried out quantitative study on rainfall triggered slide instable displacement, velocity, energy and impact force etc indices. The results have shown that the slide deformed cracking is started from trailing edge, gradually pushed forward and presented "push forward from behind" features, and belonged to typical slumping slide. Main slide time is about 30 s, maximum mean motion velocity 3.3 m/s, maximum displacement about 40 m. Under the peak velocity, slide energy of motion is only about 17.5% of gravitational potential energy decrement;collision and friction energy consumptions always taken up dominant position. Landslide may smash buildings beneath, thus a significant threat on resident life and property safety of a dozen more households. The study can provide science and technology support, and a certain reference value for accumulated layer slide risk prediction, thus the study has important disaster prevention and mitigation significance.

关 键 词：凤凰山滑坡 PFC3D 运动特征 冲击强度 

分 类 号：P642.22[天文地球—工程地质学]