西北地质Issue(3)：185-191,7.
天水市“7.25”群发性山洪地质灾害发育特征及成因分析
Analysis on the Development Characteristics and Hydrodynamic Conditions for the Massive Debris Flow in Tianshui
摘要
Abstract
Through a field investigation, the disastrous situation, causal factors, disaster characteristics,scope and distribution of massive mountain torrent geo-hazard on July 25 in Tianshui were systematically identified,and the development characteristics and causes were analyzed.The results show that the main types of geo-hazard caused and exacerbated by the heavy rainfall are mud stone landslides and loess landslides,followed by small debris flow,soil collapse and soil slope instability.The geological hazards had the characteristics as follows:universality,obviously group-occurring,local outbreak,deeply concealed,potentially hazardous and of significant disaster chain mode. The rainfall during the geological hazard had such characteristics as highly intensive and wide in range,which leads to the saturation of rock and soil of the mountain,and reduces the shear strength of rock and soil significantly.The massive mountain torrent geological hazard is exacerbated with the superposition effect of the earthquake and rain.关键词
天水市/地质灾害/发育特征/叠加效应Key words
Tianshui city/geological hazard/development characteristics/superposition effect分类
天文与地球科学引用本文复制引用
于国强,张茂省,胡炜..天水市“7.25”群发性山洪地质灾害发育特征及成因分析[J].西北地质,2014,(3):185-191,7.基金项目
国家自然科学基金项目(41302224),陕西省自然科学基础研究计划项目(2014KJXX-20,2012JQ5001),国家地质找矿专项“西北地区典型重大突发地质灾害调查”(12120114025901) （41302224）
