Development Characteristics Of Geological Hazards And Safety Evaluation Of Affected Areas In Fushun West Open-Pit Mine

The Fushun West Open Pit Mine,which has a century of mining history,has entered a closed pit period.The complexity of its geological environment,diversity of mining activities,and sustainability of mining projects have led to the frequent and persistent occurrence of geological disasters in the mining area.Due to the special nature of"cities built on coal,mines within the city",resource extraction has caused a series of disasters,which have a great impact on residents and enterprises in nearby mining areas.This article conducts research and analysis on the development characteristics and distribution patterns of landslides and ground fissures on a spatiotemporal scale.By conducting statistical analysis on the occurrence time,month,region,and influencing factors of geological disasters,a regular understanding is obtained;Established a comprehensive safety evaluation index system;And a dynamic safety evaluation was conducted on the western open-pit mine and the disaster affected area,and the main results were as follows:（1）Landslides have expanded from the western region of the southern slope to the western end and northern slope.After 2000,they have shifted to the central and eastern regions of the densely populated northern slope,forming a huge sliding deformation mass in the southern slope.The frequency of landslide disasters has decreased,but the scale and location of the occurrence have deepened the impact on nearby factory and residential areas;In the current slope stability analysis,the slope stability in the backfilled area is good.The stability coefficient of the slope in the unfilled area near E1400 and E2400 in the eastern part of the mine pit is 1.1,which basically meets the safety reserve requirements for slope stability;The ground fissures in the northern slope are mainly controlled by the F₁and F_1Afault structures,and are continuously driven and influenced by open-pit and underground mining.The main factors leading to the formation of ground fissures in the southern slope are the sliding deformation of unstable rock masses driven by open-pit mining activities in adverse geological environments;Geological disasters mainly occur from July to September,mostly during the rainy season;Landslide disasters are significantly controlled by weak interlayers;The impact of mining engineering activities on geological disasters is highly evident and has a regular pattern.（2）Based on the DPSR model,four primary system layer factors,including driving force,pressure,state,and response,are established with geological safety as the center;9 secondary factor layers,including mining activity driving,resource and environmental pressure,and geological disaster status;A three-level comprehensive safety evaluation index system with 30 three-level indicator layer factors.（3）The analytic hierarchy process is used to give weight to the indicators,among which the mining intensity,tectonics,landslide disaster,ground fissure disaster,disaster affected area and geological environment improvement in the indicator layer have a greater impact on the safety evaluation of the mining city.（4）The dynamic safety evaluation of the research area was conducted using the fuzzy comprehensive evaluation method.The results showed that from 1950 to 2020,the safety of the response system was on the rise,the safety score of the pressure system was decreasing,and the comprehensive safety score was on a fluctuating upward trend.The evaluation results were analyzed and verified based on the actual situation of Fushun west Open Pit Mine.Clarified the spatial evolution process of geological disasters caused by the mining of the Fushun West Open Pit Mine in chronological order,analyzed the influencing factors,and conducted a dynamic safety comprehensive evaluation,providing scientific basis for the government to make protective and governance decisions.