黔东地区锰矿顶板基于LEC法的分类分级管理研究

A Research on Classification and Grading Management of Manganese Mine Roof in Eastern Guizhou Based on LEC Method

黔东地区锰矿资源丰富,均为沉积型碳酸锰矿,矿体呈层状、似层状产出,与围岩产状基本一致。通过研究黔东地区锰矿开采揭露的顶板围岩稳固性及组合特征,归纳总结了该地区锰矿顶板围岩特征,即含锰岩系特征。根据含锰岩系特征对锰矿顶板进行分类。考虑到不同类型的巷道或采场在不同类型顶板围岩中的安全要求、时间要求、稳定性要求、允许的空顶跨度及人员密集程度等影响因素,采用作业条件危险性评价法(LEC)对不同巷道或采场的顶板围岩风险等级进行了评估,将其划分为红、橙、黄、蓝4个级别,分别对应重大风险、较大风险、一般风险和低风险。同时,将顶板危险性进行量化分级,分为Ⅰ、Ⅱ、Ⅲ、Ⅳ4个级别。针对不同风险等级的顶板,提出相应的分级管理措施,以实现顶板分级管理,有效地降低顶板事故的发生率,确保安全生产。

Manganese resources in eastern Guizhou region are abundant,all of which are sedimentary manganese carbonate deposits.The ore bodies are produced in a layered or quasi layered manner,which is basically consistent with the occurrence of surrounding rocks.In studying the stability and combination characteristics of the roof surrounding rock exposed by manganese mining in eastern Guizhou region,the characteristics of the roof surrounding rock of the manganese mine in the region,namely the characteristics of the manganese bearing rock series,were summarized.It classifies the roof of manganese deposits based on the characteristics of manganese bearing rock formations.Considering the safety requirements,if time is in stability requirements,we think that the allowable empty roof span and personnel density of different types of tunnels or mining areas are in different types of roof surrounding rocks.The Operating Condition Hazard Assessment(LEC)method was used to evaluate the risk level of roof surrounding rocks in different types of tunnels or mining areas.It will be dividing them into four levels:red,orange,yellow,and blue.It is corresponding to major risk,major risk,general risk and low risk.At the same time,the danger level of the roof is quantified and classified into four levels:Ⅰ,Ⅱ,Ⅲ,andⅣ.We are proposing corresponding graded management measures for roof panels with different risk levels to achieve graded management of roof panels,effectively to reduce the incidence of roof accidents and ensure safety production.