Research on the influence of the nature of the weathered bedrock zone on the roof water bursting and sand bursting: taking Zhaogu No. 1 Mine as an example

被引：0

作者：

Xu Y. ^{[1
]}

Ma Z. ^{[1
]}

Li X. ^{[2
]}

Miao W. ^{[1
]}

Zhang E. ^{[1
]}

Jiang W. ^{[2
]}

Zhuo Y. ^{[2
]}

Tian Y. ^{[1
]}

机构：

[1] School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing

[2] Jiaozuo Coal Industrial Group Zhaogu (Xinxiang) Energy Co., Ltd., Jiaozuo

来源：

Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2023年 / 51卷 / 07期

关键词：

bedrock weathering zone; disintegration test; dry saturated water absorption rate; roof water inrush; sand bursting; saturated uniaxial compressive strength;

D O I：

10.13199/j.cnki.cst.2021-1268

中图分类号：

学科分类号：

摘要：

Based on Zhaogu No. 1 Mine's characters that are the overlying thick alluvium, multi-aquifers (groups) and thin bedrock, the water pressure of the gravel aquifer under the alluvial layer reaches 4.0 MPa, defined a high-pressure aquifer. To determine the influence of bedrock properties on roof water inrush and sand bursting, and ensure the normal mining around the thin bedrock area under groups, there were tests, point loading, dry saturated water absorption rate and indoor disintegration, of bedrock samples taken from hydrological survey holes to determine those properties and influence on retaining sand-proof pillars by analyzing the variation curves of various indexes of them with depth. The experiments' results showed that the weathering depth of bedrock exceeds 20 m; the dry saturated water absorption rate of mudstone in the vertical depth ranging of 0−6.5 m from the bottom interface of the alluvial layer is greater than 15%. The mudstone exposed to water features muddy disintegration, broken rock fragments and mud blocks, which means it is good water-proof performance of effective bridging mining cracks and a protective layer for waterproof coal pillars; as the strength of weathered mudstone below the alluvial layer 0 to 11.4 m is lower than it of the fine gravel aquifer in the lower that of 4.0 MPa, the sand control coal pillar's protective layer that is greater more than 11.4 m is cannot be entirely composed of weathered mudstone; due to strong resistance to disintegration and lower dry saturated water absorption rate of sandstone, the protective layer cannot be entirely composed of weathered sandstone. The compressive strength of weathered sandstone, when it is higher than 4.0 MPa, can effectively resist the overlying water head pressure. © 2023 China Coal Society. All Rights Reserved.

引用

页码：64 / 71

页数：7

共 23 条

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