地下水运移对露天矿山边坡的影响探析与渗流减缓措施研究
Research on the impact of groundwater transport and seepage mitigation measures on the mining slope of open-pit mine
何海龙 1王鹏胜 1薛陆 1张龙 1梁金宝1
作者信息
- 1. 山西冶金岩土工程勘察有限公司,山西太原 030000
- 折叠
摘要
地下水渗流劣化岩体力学性能,降低围岩稳定性,容易引发矿山边坡失稳.通过对某露天开采铁矿南帮边坡进行水文地质勘察,明确了地层渗透特性,分析了矿山边坡地下水分布特征和运移规律,并采用"帷幕注浆+降水井疏堵"的方式对地下水进行综合处置.研究表明,短时强降水入渗排土场形成蓄水体,然后以强风化构造裂隙发育岩层为渗流通道,由排土场向矿山采坑渗流,劣化岩体的力学性能,降低了土岩接触界面的抗剪强度,致使矿山边坡滑塌.现场实验表明,"帷幕注浆+降水井疏堵"方式对地下水的综合治理效果良好,有效截断了蓄水体与采坑之间的渗流通道,降低了地下水对矿山边坡的影响,提升了边坡稳定性,可有效解决矿区向下开挖延伸过程中的边坡滑塌隐患.
Abstract
Groundwater seepage can deteriorate the mechanical properties of rock mass,reduce the stability of surrounding rock,and easily lead to instability of mine slopes.Through hydrogeological investigation of the southern slope of an open-pit iron mine,the stratum permeability characteristics were clarified,and the distribution characteristics and migration patterns of groundwater in the mine slope were analyzed.Then,the comprehensive treatment of groundwater was carried out by using curtain grouting and dewatering wells for drainage and plugging.The results indicate that the short-term heavy precipitation seeps into the waste dump to form a water storage body,and then uses the strongly weathered structural fracture-devel-oped rock stratum as seepage channel to seep from the waste dump to the mine pit.Seepage deteriorates the mechanical properties of rock mass,reduces the shear strength of the soil-rock contact interface,and causes the collapse of the mine slope.The field experiment shows that the use of curtain grouting for leakage pre-vention and drainage of precipitation wells for the comprehensive treatment of groundwater has good re-sults.After treatment,the seepage channel between the water storage body and the mining pit is effectively cut off,the influence of groundwater on the mine slope is reduced,and the slope stability is improved.Fur-thermore,the hidden danger of slope collapse during the downward excavation and extension process of the mining area is solved.
关键词
露天采矿边坡/地下水渗流/帷幕注浆/降水井设计/边坡稳定性Key words
Slope of open-pit mining/Groundwater seepage/Curtain grouting/Dewatering well design/Slope stability引用本文复制引用
基金项目
国家重点研发计划资助项目(2022YFC3702305)
出版年
2024
NETL
NSTL
万方数据