Similarity model tests of movement and deformation of coal-rock mass below stopes

作     者：WANG, Haifeng CHENG, Yuanping YUAN, Liang WANG, Liang 

作者机构：national engineering research center for coal & gas controlchina university of mining & technologyxuzhou 221008china huainan mining industry (group) limited liability companypostdoctoral science research workstationhuainan 232046china 

出 版 物：《Mining Science and Technology》 (矿业科学技术（英文版）)

年 卷 期：2010年第20卷第2期

页      面：188-192页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：the Major Programs of the National Basic Research Program of China (No.2005CB221503) the National Natural Science Foundation of China (Nos. 70533050 and 50674089) for their support of this project 

主　　题：coal-rock mass below stope low protected seam plane strain similar model test 

摘      要：For a study of the movement and deformation of coal-rock mass and low protected seams below a stope,as well as for fracture developments and rules of evolution of permeability,we designed a plane strain model test stand to carry out model tests of similar materials in order to improve the effect of gas drainage from low protected seams and to measure the movement and deformation of coal-rock mass using a method of non-contact close-range *** results show that 1) using paraffin melting to take the place of coal seam mining can satisfy the mining conditions of a protective seam;2) coal-rock mass under goafs has an upward movement after the protective seam has been mined,causing floor heaving;3) low protected seams become swollen and deformed,providing a good pressure-relief effect and causing the coal-rock mass under both sides of coal pillars to become deformed by compression and 4) the evolution of permeability of low protected seams follows the way of initial values→a slight decrease→a great increase→stability→final ***,the coefficient of air permeability increased at a decreasing rate with an increase in interlayer spacing.