崩落法采动地压环境下采场进路断面形状及尺寸动态优选  

Section Shape and Size Optimization of Stope Approach Under Mining-Induced Ground Pressure Environment with Sublevel Caving Method

作　　者：梁博 马国虎 谭宝会[1] 钟立鹏 胡颖鹏 贾凯跃 张志贵[1] LIANG Bo;MA Guohu;TAN Baohui;ZHONG Lipeng;HU Yingpeng;JIA Kaiyue;ZHANG Zhigui(School of Environment and Resource,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Longshou Mine,Jinchuan Group Co.,Ltd.,Jinchang,Gansu 737102,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳市621010 [2]金川集团有限公司龙首矿,甘肃金昌市737102

出　　处：《矿业研究与开发》2023年第8期26-35,共10页Mining Research and Development

基　　金：镍钴资源综合利用国家重点实验室开放课题(GZSYS-KY-2021-022);西南科技大学博士基金项目(21zx7157)。

摘　　要：龙首矿西二采区无底柱分段崩落采矿法采场仅可布置4个回采分段,由于各分段采动地压及采矿需求各不相同,回采进路采用单一的断面形状和尺寸很难满足实际采矿需求。为了实现各分段矿石的安全高效回采,采用数值模拟方法对无底柱分段崩落法开采过程的采动地压演化规律进行了研究。结果表明,随着崩落法采场逐分段开采,采场地压呈现出水平压力增加、竖向压力减小的规律。继而根据采动地压变化规律,对采场中4个分段的进路断面形状及尺寸进行了研究,得出结论为首采分段和最末分段推荐采用高×宽为4.2 m×4.4 m的直墙半圆拱进路,第二和第三分段推荐采用高×宽为3.8 m×4.4 m的直墙三心拱进路。最终,将研究结果用于现场生产实践,在确保采场稳定性的同时,使分段矿石回采率达到了103%,贫化率仅为8.5%,采场月产能达到8万t。Only four stoping sublevels can be arranged in the non-pillar sublevel caving stope of the west No.2mining area of Longshou Mine.The mining pressure and mining demand of each sublevel are different.It is difficult to meet the actual mining demand by using the shape and size of a single section.In order to realize the safe and efficient mining of ore in each sublevel,the numerical simulation method was used to study the evolution law of mining-induced ground pressure in the mining process of non-pillar sublevel caving mining method.The results show that with the sublevel mining of the caving stope,the mining site pressure shows the law of increasing horizontal pressure and decreasing vertical pressure.Then,according to the variation law of mining-induced ground pressure,the approach section shape and size of the four sublevels in the stope were studied,and it is concluded that the straight wall semi-circular arch approach with a height×width of 4.2m×4.4m should be recommended for the first and the last sublevels,and the straight wall three-center arch approach with a height×width of 3.8m×4.4m should be recommended for the second and the third sublevels.Finally,the research results were applied to the field production practice.While ensuring the stope stability,the recovery rate of the sublevel ore reaches 103%,the dilution rate is only 8.5%,and the monthly production capacity of the stope reaches 80000 tons.

关 键 词：无底柱分段崩落采矿法 采动地压 进路形状 断面尺寸 采场稳定性 

分 类 号：TD853.362[矿业工程—金属矿开采]