Mechanical model of stability of water-resistant strata under mining and its application

作者：Yao Bang Hua^*; Bai Hai Bo; Huang Han Fu; Pu Hai

来源：Journal of Mining & Safety Engineering, 2012, 29(3): 307-311.

• Broken rock
• Coal seams
• Critical load
• Deflection and stress
• Distribution characteristics
• Energy method
• Engineering practices
• Maximum values
• Mechanical model
• Overlying strata
• Plate theories
• Rectangular thick plate
• Research results
• Rock stratums
• Support effects
• Supporting effect
• Water inrush
• Water-resistant strata
• Working face

In this paper, to research the stability of overlying water-resistant strata and prevent the roof water inrush accidents as well as implement water-preserved-mining, we regarded the water-resistant strata composed by only one rock stratum as clamped rectangular thick plate on foundation, and took the support effect of broken rock mass under the water-resistant strata into account, then deduced the deflection and stress expression according to energy method, and obtained the stress distribution characteristics of overlying water-resistant strata, as well as the variation rule of critical load along with working face advancement. In addition, combined with specific engineering practice, the stability of overlying water-resistant strata was analyzed by numerical simulation. The results indicate that: 1) after coal seam mining, the stress of overlying strata reaches the maximum value in the middle of longer boundary of the plate, where the rock is easy to be damaged; 2) the supporting effect of broken rock mass have important influence on the stability of overlying water-resistant strata, that is, the thinner the mining thickness is, the stronger the supporting effect of broken rock mass to the overlying water-resistant strata is, and the more difficult the water-resistant strata to be broken. The research results can provide some reference for the prevention of roof water inrush and water-preserved-mining practice.

• 出版日期2012
• 单位中国矿业大学（北京）