赣州地区地质灾害发育特征分析

Analysis on the development characteristicsof geological hazards in Ganzhou Area

为研究赣州地区地质灾害发生的发育特征,了解地质灾害与岩土体、降雨及人工活动的成因关系。通过收集赣州市各县市区1/5万地质灾害风险调查成果数据,统计分析已发生地质灾害的岩土类型,并选取典型灾害点进行剖析,结果表明:(1)地质灾害体的物质成分以土体为主,岩土体为辅;(2)地质灾害主要发生在主汛期和台风影响期;(3)地域上多分布在变质岩、花岗岩分布的山地丘陵地带,与降雨区域相吻合,突发性、群发性强。地质灾害发生的主要岩土类型以变质岩建造(B)为主,原因是其分布面积大,以及受构造运动的影响,岩石破碎,抗风化能力差等。除此之外,绝大部分发生的地质灾害与不合理的人工切坡有关,汛期集中强降雨是诱发地质灾害的主要自然因素。今后对于这些小型地质灾害的防治,建议主要以简易工程治理为主,对简易工程治理的方案选取有着一定的指导意义。

In order to study the development characteristics of geological hazards in Ganzhou area and understand the genetic relationship between geological hazards and rock mass,rainfall and artificial activities.Through collecting 1/50,000 geological disaster risk survey results in Ganzhou city,the geotechnical types of geological disasters have been statistically analyzed,and the typical disaster points are selected for analysis.The results show that:(1)the material composition of geological disasters is mainly soil mass,and the geotechnical mass is auxiliary;(2)Geological disasters mainly occur in the main flood season and typhoon affected period;(3)Geographically,it is mostly distributed in the mountainous and hilly areas where metamorphic rocks and granites are distributed,which is consistent with the rainfall area,and the sudden and mass occurrence is strong.The main rock and soil types of geological disasters are mainly metamorphic rock construction(B),because of its large distribution area,and the impact of tectonic movement,rock fragmentation,poor weathering resistance and so on.In addition,most of the geological disasters are related to unreasonable artificial slope cutting,and the concentrated heavy rainfall in flood season is the main natural factor inducing geological disasters.In the future,for the prevention and control of these small geological disasters,it is suggested to mainly take simple engineering treatment,which has certain guiding significance for the selection of simple engineering treatment programs.