摘要
注浆堵水是煤矿水害防治常用的技术手段之一,而注浆效果定量判识是注浆工程中的关键环节.以平顶山煤田七矿寒武灰岩导水通道帷幕注浆封堵工程为研究对象,遴选注浆量、单位时间注浆量、延米注浆量、终孔压力、终孔层位及岩石力学强度变化为帷幕注浆堵水效果评价的指标体系.采用层次分析法、熵权法、组合赋权法确定指标因子的主观、客观及综合权重,应用模糊可变集模型定量判识了帷幕注浆堵水效果并进行了排序.研究表明,通道治理效果的综合排名为:6号通道最佳,依次是3号、2号、1号、5号和4号通道,所有钻孔和通道的注浆效果均达到合格或以上,总体表现良好.导水通道注浆封堵后,由于七矿与五矿之间水力联系较为紧密,导致两矿的水文情况显著变化.七矿动水补给量和五矿排水量在枯水期合计减少435.74 m3/h,在丰水期合计降低809.98 m3/h,帷幕注浆堵水效果显著.
Abstract
Grouting for water sealing is one of the commonly used technical means for coal mine water hazard prevention and control,and quantitative identification of grouting effect is a key link in grouting engineering.The study focused on the curtain grouting sealing pro-ject of the Cambrian limestone water conducted channels in the No.7 Mine of Pingdingshan Coalfield.The evaluation index system for the effectiveness of curtain grouting water sealing was selected based on the grouting amount,unit time grouting amount,linear meter grouting amount,final hole pressure,final hole layer,and rock mechanical strength changes.The subjective,objective,and comprehen-sive weights of indicator factors were determined using Analytic Hierarchy Process,Entropy Weight Method,and Combination Weighting Method.The fuzzy variable-set model was applied to quantitatively identify and rank the water sealing effect of curtain grouting.The re-search showed that the comprehensive ranking of treatment effects for the channels was as follows:channel 6 was the best,followed by channel 3,channel 2,channel 1,channel 5,and channel 4.The grouting effects of all drilling and channels were qualified or good,and the overall grouting effect was good.After grouting to seal the water conducted channels,the hydrological conditions of the No.7 Mine and No.5 Mine significantly changed due to the close hydraulic connection between them.The total amount of water supply from the No.7 Mine and drainage from the No.5 Mine decreased by 435.74 m3/h during the dry season,and by 809.98 m3/h during the flood season.The curtain grouting has a significant effect on water sealing.
基金项目
国家自然科学基金项目(41972254)
河南省创新型科技人才队伍建设工程项目(CXTD2016053)
河南省高校基本科研业务费专项(NSFRF200103)
维普
万方数据