程潮铁矿塌陷区周边地表变形扩展规律研究

doi:10.13722/j.cnki.jrme.2017.0916

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Abstract Analysis of surface deformation induced by underground mining can provide guidance for figuring out the range of surface deformation and guaranteeing the safety production of the mine. The west zone of Chengchao iron mine was investigated through the comprehensive analysis of monitoring data from 2006 to 2017 and the trend of ground deformation after surface collapse was studied. The effects of rainfall on the surface deformation and rock movement were discussed based on the collected hydrogeological and meteorological data. The results show that the surface deformation had been extending constantly outward since the ground collapse. From the moment of ground collapse to the end of September 2008，the surface deformation expanded with the collapse area as the center，and evenly expanded in the hanging wall and footwall. However，in December 2014，the footwall deformation proved significantly greater than the hanging wall with the center of deformation area shifted to the mined-out zone. The depth and extent of the funnel-shaped surface deformation were expanding unceasingly with the time passing. In the north-south direction，the expansion of deformation funnel in the north was greater than in the south. In the east-west direction，the center of the collapsing funnel kept moving eastward. According to the mechanism of rock movement，the deformation area of deep rock mass is divided into the toppling-sliding zone，the toppling-cracked zone and the bending deformation zone. In the toppling-sliding zone，the deformation of the surface is maintained at a large speed after the accelerated deformation stage. In the toppling-cracked zone，the surface deformation restores the stability after the accelerated deformation，and the deformation of the bending deformation zone is maintained at a small rate. The monitoring points around the mined-out area have obvious deformation acceleration before the surface collapse. Surface deformation is related to the rainfall intensity and rainfall duration，which has two peaks in February to March and May to August respectively.

Key words： mining engineering underground mining mine monitoring surface deformation deformation expansion zoning of rock

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	Articles by authors
	SONG Xugen1
	2
	CHEN Congxin1
	XIA Kaizong1
	YANG Kuoyu1
	2
	CHEN Shan1
	2
	ZHANG Haina1
	2

Cite this article:

SONG Xugen1,2,CHEN Congxin1, et al. Study on ground deformation around collapse zone in Chengchao iron mine[J]. , 2018, 37(2): 415-429.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0916 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I2/415

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