Geological Environment Safety Evaluation

The geological environment safety evaluation is becoming increasingly more important in land planning since the geological environment is getting more complicated in recent years. Based on summarizing the previous comprehensive evaluation of geological environment, a comprehensive evaluation index system of geological environment safety is established and a comprehensive evaluation method thereof is developed to provide scientific basis and technical support for land planning and evaluation of resources and environment carrying capacity. The connotation of geological environment safety is put forward, and three key factors for geological environmental safety evaluation are determined as regional crust stability, susceptibility of geologic hazards, and susceptibility of chronic geologic hazards, which are evaluated respectively. Five grades and twelve classes are divided through comprehensive evaluation of geological environment safety by using a comprehensive way to evaluate the dominant factors. The evaluation results not only reflect the degree of geological environment safety, but also explain the key factors affecting the geological environment safety. The area of overlapping regions, where the regional structure is extremely unstable and unexpected geological hazards are especially easy to occur, accounts for about 4.24%, mainly distributed in the eastern margin of the Tibetan plateau, mainly involving Gansu Baiyin-Tianshui, Sichuan Deyang-Kangding-Xichang,Yunnan Dongchuan-Gejiu, southern Tibet and western Yunnan areas. The results of geological environment safety evaluation enhance the understanding on geological environment, and the degree of geological environment safety, as one of the indicators of land planning, provides technical support and scientific basis for land planning. © 2021, Editorial Department of Earth Science. All right reserved.