A Prediction Method of Ground Subsidence in Two-story Goaf
A technology of land subsidence and prediction method, which is applied in measurement devices, surveying and navigation, height/level measurement, etc., can solve problems such as objectively predict subsidence values, and achieve the effects of saving calculation time, high reliability and simple logic.
Active Publication Date: 2019-12-10
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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[0006] Therefore, there are still many deficiencies in the current research on ground subsidence in multi-layer mined-out areas, and it is difficult to predict the subsidence value relatively accurately and objectively, and the research method needs to be further improved
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[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0046]In describing the present invention, it is to be understood that the terms "comprises / comprising", "consisting of" or any other variation thereof are intended to cover a non-exclusive inclusion such that a product, device, A process or method includes not only those elements, but may also include other elements not expressly listed, or elements inherent in such a product, apparatus, process, or method, as required. Without further limitations, elements...
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The invention provides a method for predicting land subsidence of a two-layer goaf. The method is implemented through land subsidence monitoring, geomechanical parameter back analysis and numerical simulation. The method mainly includes the steps that 1, before upper-layer coal mining, the land subsidence value is obtained through observation; 2, physical and mechanical parameters of each stratumof overlying rock and earth mass are determined through indoor experiments; 3, a geological model is established; 4, a yield criterion is selected to determine boundary conditions and initial stress;5, physical parameters and initial mechanical parameters of the overlying rock and earth mass are obtained; 6, a numerical simulation technology is used, and final mechanical parameters of the overlying rock and earth mass are determined through an inversion test method; 7, the land subsidence value caused by upper-layer coal is calculated by utilizing numerical simulation calculation; 8, a land subsidence value caused by lower-layer coal mining and a ground surface subsidence final value are calculated and predicted through numerical simulation. The rock and earth mass parameters used for numerical calculation are based on field land subsidence monitoring and are obtained through inversion, and the credibility of the parameters is high; after upper-layer coal mining, the parameters of anyielded overlying rock and earth mass unit are deducted, and therefore the reliability of the land subsidence value obtained through numerical calculation and prediction is high.
Description
technical field [0001] The invention relates to the field of mining safety, in particular to a method for predicting ground subsidence in a two-layer goaf based on ground subsidence monitoring data. Background technique [0002] Over the past decade, China's annual coal production has accounted for more than 40% of global annual production. Land subsidence caused by coal mining not only causes loss of property and life, but also causes a series of geological environmental problems. Therefore, the prediction of ground subsidence in goaf has economic, social and environmental benefits. The existing single-layer gob land subsidence prediction methods mainly include theoretical analysis methods, physical simulation methods, and numerical simulation methods. [0003] In order to increase the amount of coal mining and the needs of economic development, multi-layer mining of coal is very necessary. However, since the profile, shape and size of multi-layer mining are different fr...
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IPC IPC(8): G01C5/00
CPCG01C5/00
Inventor 张中俭黄琨张彬许亮
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)