Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by Mining

In western region of China, the water-sand inrush across overlying strata fissures caused by mining threatens the mine safety production seriously. In order to study the development of water-sand inrush across overlying strata fissures caused by mining, a simulated test system consisted of load supp...

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Main Authors: Guibin Zhang, Hailong Wang, Shenglei Yan, Chuanyang Jia, Xiaoyuan Song
Format: Article
Language:English
Published: Hindawi-Wiley 2020-01-01
Series:Geofluids
Online Access:http://dx.doi.org/10.1155/2020/6614213
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spelling doaj-7a78cba443db4913b434912f66bd294b2020-12-14T09:46:34ZengHindawi-WileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/66142136614213Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by MiningGuibin Zhang0Hailong Wang1Shenglei Yan2Chuanyang Jia3Xiaoyuan Song4School of Civil Engineering and Architecture, Linyi University, Linyi 276000, ChinaSchool of Civil Engineering and Architecture, Linyi University, Linyi 276000, ChinaSchool of Civil Engineering and Architecture, Linyi University, Linyi 276000, ChinaSchool of Civil Engineering and Architecture, Linyi University, Linyi 276000, ChinaSchool of Civil Engineering and Architecture, Linyi University, Linyi 276000, ChinaIn western region of China, the water-sand inrush across overlying strata fissures caused by mining threatens the mine safety production seriously. In order to study the development of water-sand inrush across overlying strata fissures caused by mining, a simulated test system consisted of load support bracket, laboratory module, confined water module, coal seam mining simulator, storage tank, and control system is developed. The combination of coal bearing strata in the south of Shendong mining area is looked on as the engineering background, and a series of new nonhydrophilic composite materials with lower intensity are developed to simulate the coal measure strata. The excavation of physical model can reproduce the whole process of water-sand inrush across overlying strata fissures caused by mining to the life. Under the action of mining and water pressure, after the fourth excavation, the mining-induced vertical fractures of overlying strata pass through the entire bedrock and connect the unconsolidated sand bed, which serves as pathways between the unconsolidated sand bed and working face, triggering water-sand inrush. The water pump suddenly accelerates, and the water yield suddenly increases to the extreme value of 150 L/h. The water pressure rapidly drops to 0 MPa, and a small amount of colored sand enters into the fractures of overlying strata and flows out with the water. The distribution of support pressure around the working face can be divided into 4 areas obviously, that is, the original stress area, the stress-concentrated area, the stress-released area, and the stress restoration area. Test results show that the system is stable and reliable, which have important significance for studying the formation mechanism of water-sand inrush across overlying strata fissures further.http://dx.doi.org/10.1155/2020/6614213
collection DOAJ
language English
format Article
sources DOAJ
author Guibin Zhang
Hailong Wang
Shenglei Yan
Chuanyang Jia
Xiaoyuan Song
spellingShingle Guibin Zhang
Hailong Wang
Shenglei Yan
Chuanyang Jia
Xiaoyuan Song
Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by Mining
Geofluids
author_facet Guibin Zhang
Hailong Wang
Shenglei Yan
Chuanyang Jia
Xiaoyuan Song
author_sort Guibin Zhang
title Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by Mining
title_short Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by Mining
title_full Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by Mining
title_fullStr Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by Mining
title_full_unstemmed Simulated Experiment of Water-Sand Inrush across Overlying Strata Fissures Caused by Mining
title_sort simulated experiment of water-sand inrush across overlying strata fissures caused by mining
publisher Hindawi-Wiley
series Geofluids
issn 1468-8115
1468-8123
publishDate 2020-01-01
description In western region of China, the water-sand inrush across overlying strata fissures caused by mining threatens the mine safety production seriously. In order to study the development of water-sand inrush across overlying strata fissures caused by mining, a simulated test system consisted of load support bracket, laboratory module, confined water module, coal seam mining simulator, storage tank, and control system is developed. The combination of coal bearing strata in the south of Shendong mining area is looked on as the engineering background, and a series of new nonhydrophilic composite materials with lower intensity are developed to simulate the coal measure strata. The excavation of physical model can reproduce the whole process of water-sand inrush across overlying strata fissures caused by mining to the life. Under the action of mining and water pressure, after the fourth excavation, the mining-induced vertical fractures of overlying strata pass through the entire bedrock and connect the unconsolidated sand bed, which serves as pathways between the unconsolidated sand bed and working face, triggering water-sand inrush. The water pump suddenly accelerates, and the water yield suddenly increases to the extreme value of 150 L/h. The water pressure rapidly drops to 0 MPa, and a small amount of colored sand enters into the fractures of overlying strata and flows out with the water. The distribution of support pressure around the working face can be divided into 4 areas obviously, that is, the original stress area, the stress-concentrated area, the stress-released area, and the stress restoration area. Test results show that the system is stable and reliable, which have important significance for studying the formation mechanism of water-sand inrush across overlying strata fissures further.
url http://dx.doi.org/10.1155/2020/6614213
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