Goaf group instability analysis based on rigid frame structure model method
JIANG Lichun1，2，XIAO Kang2，WU Aixiang3
(1. School of Civil Engineering and Transportation，South China University of Technology，Guangzhou，Guangdong 510640，China； 2. Institute of Safety Science and Engineering，South China University of Technology，Guangzhou，Guangdong 510640，China； 3. School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China)
Abstract：In order to study the overall stability of vertical goaf group under external load，a rigid frame structure model was developed by converting vertical goaf group into plane frame system. Based on the model，a goaf group instability judgment criteria and analysis method was presented. The method，together with numerical simulation method，was used respectively to analyze the overall stability of a vertical goaf group after completely mining the pillar of the uppermost level. The result shows that，after mining the pillar，the maximum tensile stress and vertical deformation of the uppermost roof surrounding rock mass both exceed the permitted threshold，which has led severe instability to the goaf group. Comparing with numerical simulation method，the conclusion of two methods has close values of internal rock mass both on maximum tensile stress and compressive stress，which shows similar variation trend. The field engineering proves that the gob roof rock mass of the uppermost level has been collapsed and the gob has extended to surface，which has verified the rigid frame structure model method in large part.
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2016, Vol. 35 
