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海南某铁矿露天采场挂帮矿回采区及其地表环境地质研究

2017-07-10唐洪刚

价值工程 2017年20期

唐洪刚

摘要: 海南某铁矿露天采场挂帮矿(以下简称挂帮矿)随着采矿工作的持续进行,回采区及其地表(项目部所在地、项目部至挂帮矿的公路沿线和挂帮矿36米中段硐口附近)的环境地质条件不断恶化。其中,项目部至挂帮矿的公路的一段边坡已发生了较大规模垮塌,使其已永久不能再使用。随着回采区不断向地表发展,对露天采场挂帮矿回采区及其地表环境地质条件有进一步恶化的趋势,具体情况如下。

Abstract: As mining continuing, the environmental geology conditions become deteriorating in the area of mining recovery area and its surface of hanging wall ore ( hereinafter referred to as hanging wall ore ) in one iron mine open pit of Hainan. The specific environmental worsening area covered the location of project department, along the highway from the department to handing wall ore and near its cave mouth of the middle section in 36 meter, of which the slope of the section of the highway has collapsed on a large scale with the result that it cannot be used forever. With the continuous development of the mining area to the surface, the environment geology conditions of the study area show a trend toward further deterioration, and the specific conditions will be stated in this paper.

关键词: 回采区;环境地质;垮塌

Key words: mining recovery area;environmental geology;collapse

中图分类号:TD861 文献标识码:A 文章编号:1006-4311(2017)20-0178-03

1 项目部驻地的环境地质状况

项目部驻地环境地质状况主要受地质构造条件、原始地貌特征、大气降水及其排泄系统和挂帮矿回采所形成的陷落区等的影响。

①地质构造的影响:从1:2000的矿区地质图来看,有一走向北西-南东、倾向北东的断层穿过项目部驻地;在其东南方向约80-160米的范围内分布有四条断层(见图1)。受他们的影响, 驻地及其附近的岩体较破碎,且呈中-强风化程度,岩体质量整体属Ⅲ-Ⅴ类(见图2),稳定性较差。

②原始地貌特征:项目部驻地的原始地貌呈北低南高的沟谷地形(见图3),与当前完全不同,北部沟谷被后来挖掘风井的废石所填埋,因而项目部驻地北部的五栋板房地基稳定性非常差。

③挂帮矿回采爆破震动及其所形成的陷落区:项目部驻地位于挂帮矿30米分层回采区北东方向,标高215米,与爆破点最短水平距离67米,垂直高度185米,放大炮时震动强烈,已导致项目部地板大面积开裂(见图3中照片);……

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