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城晏
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3 Study on the Mechanism of Ground Subsidence and Evaluation of Ecological Safety in Beiminghe Iron Mine Candidate Zheng xinhua Supervisor Cai meifeng School of Civil and Environment Engineering University of Science and Technology Beijing 30 Xueyuan Road Haidian District Beijing P.R.CHINA

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6 Study on the Mechanism of Ground Subsidence and Evaluation of Ecological Safety in Beiminghe Iron Mine Abstract Ground subsidence is one of the most important engineering geological disasters in mine district, which seriously endangers the production safety and destroys ground environment. In this paper, mechanism of ground subsidence in Beiminghe iron mine was studied, and ecological safety evaluation of the mine area was analyzed. In the paper, firstly, the damage of ground subsidence and the significance of research were analyzed. Secondly, the mechanism and development process of ground subsidence which aroused by underground mining were studied. Water penetrating back of Beiminghe iron mine come into being underground moving water. Based on this, models of collapse mechanism aroused by water level descending and rising and surface water penetrating in were put forward. Based on the prediction of ground subsidence caused by mining in probability integral method, developing uniform coordinate system, these two forms of subsidence due to different causes were superimposed roughly on conditions as optimal as possible. In this way, ground subsidence problems from dual effect of mining and groundwater drawing will be solved consequently. Finally, evaluation of ecological safety in the mine area was analyzed. Appropriate ecological safety target system was established. Ecological safety evaluation of ground subsidence was analyzed. Key Words ground subsidence, mechanism, prediction, evaluation of ecological safety - 3 -

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11 1 1.1 [1] [2] [3] 500km m km 2 30m 6m 130cm km 2 193km 2 [4]

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13 2004BA615A

14 60 (Berry) [8,9] Sales Conroy Gyarmaty full profile borehole extensor-meter full profile borehole inclinometer [10] 1965 [11] 1979 [12] 1981 [13] Weber 1983 [14] [15]

15 [16] [17] [18] [19] Knothe [20] Hooke [21] - 6 -

16 [22] I p = ( γ 3 1)(1 n) 1-1 I p γ 3 n 1 I p KJ MK J = ( ) n 2n 2 2 E d Mu = M = Ed ( ) kgm 2 /d 2 M kg u m/d K m/d J n 1-2 K n E J J E d d - 7 -

2010/8 刘文革. 我国无籽西瓜产业发展状况与对策 -122- 省份表 1 分研究尧栽培生理尧转基因等方面研究不断深入袁并通过研究培养了一大批博士尧硕士袁充实到无籽西瓜

2010/8 刘文革. 我国无籽西瓜产业发展状况与对策 -122- 省份表 1 分研究尧栽培生理尧转基因等方面研究不断深入袁并通过研究培养了一大批博士尧硕士袁充实到无籽西瓜 -121- 允韵哉砸晕粤蕴韵云悦匀粤晕郧允陨粤晕郧灾耘郧耘栽粤月蕴耘杂 2010 渊 8 冤院 121-127 DOI:10.3865/j.issn.1001-3547.2010.08.042 我国无籽西瓜产业发展状况与对策刘文革渊中国农业科学院郑州果树研究所袁河南郑州