郑杰青

摘要：地质灾害易发区和危险区是根据地质灾害发育程度、分布规律，将地质灾害类型相同，发育条件相近，易发和危险程度相似或接近划分为同一区块。在对某一地区地质灾害进行预防或治理之前必须对其特征进行分析和研究。对地质灾害区划及分区特征的研究往往决定着后续工作的开展及布置。在划分出高易发区和高危险区的基础上，进一步划分出研究区的重点地段，这对制订研究区的地质灾害防治规划具有非常重要的现实意义。文章通过对广东省紫金县地质灾害区划特点及分区评述为例，对地质灾害区划及分区进行归纳总结，希望以此为该地区地质灾害预防与治理提供一些指导作用。

关键词：地质灾害区划；分区；紫金县

The regional characteristics of geological disaster and its review

——take zijin county in guangdong province as an example

Zheng-Jie qing

The seventh geological brigade of guangdong geological bureau，huizhou 516000

Abstract： according to the development degree and distribution law of geological hazards，the prone and dangerous areas are divided into the same block with the same types of geological hazards，similar development conditions，and similar risk degree.It is necessary to analyze and study the characteristics of geological disasters before the prevention or management of geological disasters in a certain area.On the basis of dividing the high risk area and the high risk area，the key sections of the research area are further divided，which is of great practical significance to the planning of geological disaster prevention and control in the research area.Based on the characteristics and zoning of geological disaster in zijin county，guangdong province，this paper summarizes the zoning and zoning of geological disaster，hoping to provide some guidance for the prevention and management of geological disaster in this area.

Keywords： geological disaster regionalization，zoning，zijin county

1.地質灾害区划与分区评价

1.1地质灾害易发区划分及分区评价

（1）分区依据。地质灾害易发区指具备地的质灾害发生的地质环境条件，容易或者可能发生地质灾害的区域。易发区的划分主要根据地质灾害现状和潜在隐患情况，在综合考虑地形地貌、地层岩性、地质构造、人类工程活动强弱、降水情况的基础上进行地质灾害综合危险性指数计算，根据分值高低再结合实际情况进行划分。

（2）分区方法与要求。依据《县（市）地质灾害调查与区划基本要求实施细则》修订稿（2007年10月）实施细则中对各灾种易发区划分要求，结合紫金县地质灾害主要影响因素，经综合分析研究本次采用半定量分析法将紫金县划分为高、中、低、不易发区四个区。……