降雨对广西碎屑岩地区地质灾害的影响研究  

RAINFALL INFLUENCE ON GEOLOGICAL DISASTER IN CLASTIC ROCK AREAS OF GUANGXI PROVINCE

作　　者：许英姿[1,2] 卢玉南 范广[1] 范皓然[1] 

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西防灾减灾与工程安全重点实验室,南宁530004 [3]广西华蓝岩土工程有限公司,南宁530001

出　　处：《工程地质学报》2016年第2期181-186,共6页Journal of Engineering Geology

基　　金：国家自然科学基金(51178124);广西壮族自治区国土资源厅重大科研课题(GXZC2015-G3-3917-KLGB)资助

摘　　要：广西碎屑岩区分布广泛,岩石风化作用强烈,节理裂隙发育,覆盖层厚薄不一,降雨作用下易发生地质灾害。本文采用统计方法分析了降雨天数、降雨强度、有效降雨量等降雨要素对广西碎屑岩区地质灾害的影响。结果表明,广西碎屑岩区地质灾害与灾害发生前5d降雨相关性较好,当降雨强度大于50mm·d^(-1)(即暴雨)或前期累积降雨量超过230mm时,地质灾害发生的概率大大增加,并由此确定出广西碎屑岩区降雨量危险等级划分标准,为该区域地质灾害预警预报提供理论依据。The clastic rock areas in Guangxi province are distributed widely.There are many geological disasters in these areas.Statistical methods are used to analyze rainfall influence to geological disasters in the clastic rock areas. The factors include the number of rainfall days,rainfall intensity and effective rainfall.Results show that the relation is good between the geological disasters in the clastic rock areas and the rainfall five days before the disaster.The probability of geological disaster is increased greatly when the rainfall intensity is greater than 50mm·d-1 （rainstorm）or the previous cumulative rainfall is greater than 230mm.The rainfall risk grading standards in the clastic rock areas are determined for warning and forecasting system of geological disasters in Guangxi province.

关 键 词：广西碎屑岩分布区 降雨 地质灾害 统计分析 

分 类 号：TU42[建筑科学—岩土工程]