Using The Height Of The Fractured Water-conducting Zone As An Early Warning Indicator Of Mining Subsidence Disaster
SUN, Xueyang; XIA, Yucheng; WANG, Shenquan; TANG, Shengli
Xi'an university of science and technology, People's Republic of China
Using the height of the fractured water-conducting zone as an early warning indicator of mining subsidence disaster
Author Keywords: height of fractured water-conducting zone；mining subsidence disaster；early warning；mechanical analysis
Paragraph 1: Why is this abstract important?
Mining subsidence induced by underground mining can compromise the aquiclude’s ability to resist the water pressure within the overlying strata above the goaf, resulting in the change in water level and flow of the aquife. When a mining coal fractures, the goaf beneath the coal/rock will be connected with the bottom layer of the important aquifer, and subsequently the groundwater will penetrate promptly through the goaf and further pass in deep rock mass along the mining induced fracture, causing the significant decrease in the water level of aquifer and most likely the loss of underground stream.
Paragraph 2: What is novel in your approach; what was done?
The paper is to evaluate the relationship between the mining activities and height of fractured water-conducting zone through which a better understanding on the mining operations, constriction procedures, characteristics of rocks can be achieved and then mining operation induced subsidence disaster can be prevented.
Paragraph 3: What are your main findings.
We suggest an early warning method to determine the likelihood of a mining subsidence disaster, with the aim of protecting the local environment. The mechanism of formation of the fractured water-conducting zone was examined via mechanical analysis and interpreted using the key stratum theory. The results showed that the height of the fractured conductive zone is influenced by factors. The critical failure threshold of the water-resisting key stratum is related to the failure of the regional aquifuge and can be used as an early indicator of an impending subsidence disaster. The relationship between the critical length of the working face and the height of fractured conductive zone is crucial to determining the mining subsidence disaster. When the length of the working face is less than the critical length, groundwater will not be lost. Once the length of working face exceeds the critical value, the water-conducting fracture zone will cut across the water-resisting key stratum, resulting in a subsidence disaster.
Paragraph 4: What are the main applications and implications of your work?
The mechanism and procedure of an early warming indicator for a mine subsidence is developed and can be used by the mining industry as a useful tool to prevent subsidence disaster.