煤矿安全2024，Vol.55Issue(5)：151-159,9.DOI:10.13347/j.cnki.mkaq.20222206
基于地质概化的坚硬厚基岩覆岩裂隙场演变特征研究
Study on evolution characteristics of fracture field in hard thick overlying strata based on geological generalization
摘要
Abstract
Accurately grasping the evolution characteristics of the water-conducting fracture zone in the mining overburden is an im-portant basis for preventing the occurrence of water inrush disasters in the working face,especially for the high strength mining con-ditions in the western mines.Taking the 201 west wing area of Yushuwan Coal Mine as the background,taking the uniaxial com-pressive strength of each sandstone layer,RQD,and thickness of sandstone layer as the system cluster analysis indexes,this paper proposes a geological generalization method for thick bedrock,systematically studies the influence of different bedrock layer thick-ness on the development height,fracture angle,frequency,and joint strain energy evolution law of the water-conducting fracture zone,and determines the quantitative relationship between the height of the water-conducting fracture zone and the total joint strain energy.The research results show that:the development height of the hydraulic fracture zone simulated based on the geological gen-eralization method presents a log-positive correlation increasing trend with the increase of the bedrock thickness,and the increasing rate gradually decreases.This law is verified by comparing with the measured results of the adjacent mines;with the increase of the thickness of bedrock,the development frequency of vertical cracks in the water-conducting fracture zone increases significantly,while the horizontal cracks in the water-conducting fracture zone increase,which indicates that the increase of the thickness of bed-rock has a certain inhibition effect on the initiation and expansion of horizontal cracks in the water-conducting fracture zone;the de-velopment height of the water-conducting fracture zone is closely related to the energy release degree of the overlying rock.It in-creases exponentially with the increase of the maximum strain energy and the total strain energy of the joint,and the increasing rate gradually increases.关键词
导水裂隙带/厚基岩/地质概化/数值模拟/预测模型Key words
water conducting fractured zone/thick bedrock/geological generalization/numerical simulation/prediction model分类
矿业与冶金引用本文复制引用
高兴斌,张加加,杨康,贺伟,史志华,陈梁,白如鸿,孙强..基于地质概化的坚硬厚基岩覆岩裂隙场演变特征研究[J].煤矿安全,2024,55(5):151-159,9.基金项目
国家自然科学基金青年科学基金资助项目(52104100) （52104100）
中国博士后面上基金资助项目(2021M703503) （2021M703503）
