Optimum Filling Thickness Control Method of Coal Gangue
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A technology for thickness control and coal gangue, which is applied in the field of coal gangue agricultural reclamation, can solve the problems of unfavorable engineering characteristics of coal gangue, uneven settlement of the surface, etc., so as to solve the problem of uneven settlement of the surface and solve the control of unfavorable engineering characteristics of coal gangue. problems, the effect of reducing engineering costs
Active Publication Date: 2018-11-30
CHINA UNIV OF MINING & TECH
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[0003] The purpose of the present invention is to provide a method for controlling the optimum filling thickness of coal gangue to solve the problem of uneven subsidence of the surface in large-area land reclamation and the control of unfavorable engineering characteristics of coal gangue, and to prevent weathering, spontaneous combustion, corrosion and swelling of coal gangue and other unfavorable engineering properties
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Embodiment 1
[0048] Embodiment 1: The control method is to first determine the critical layer thickness of coal gangue during engineering design, then determine the optimal layer thickness, and finally calculate the filling superelevation; The leveling method controls the layer thickness; the method steps include:
[0049] (1) Equal thickness layered filling
[0050] This is the most economical and homogeneous filling method; the so-called equal-thickness layered filling is to improve the relative compaction of coal gangue and increase the bearing capacity of gangue. When backfilling gangue, fill it with the same thickness from bottom to top. So as to reach the design level;
[0051] The so-called most economical is the total number of compaction times ΣN=Min, thus setting:
[0052] 1) at h≤h L , that is, when the layer thickness is less than the critical thickness, h can take h i (i=1,2,...,k), the corresponding compaction times N i (i=1,2,...,k); when h i >h j , with N i >N j es...
Embodiment 2
[0100] 1. Applicable conditions
[0101] (1) Natural environmental conditions
[0102] Layered filling is most suitable for areas without water accumulation or seasonal water accumulation and subsidence land with small amount of water accumulation. For subsidence land with a large amount of accumulated water, the accumulated water must be drained first. It is difficult to implement stratification if the topographical conditions are too complex, so the degree of water accumulation in the subsidence and the complexity of the topographical conditions constitute the prerequisites for this method.
[0103] (2) Special basin conditions
[0104] Here it mainly refers to the characteristics of the basin. Mining in steeply inclined coal seams, ultra-shallow mining and other special geological conditions make the shape of the basin extremely complex. Some basins have extremely deep and steep bottoms, the so-called funnel-shaped basins, and some basins are discontinuous with steps, cra...
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Abstract
The invention relates to an optimal filling thickness control method for coal gangue and belongs to agricultural reclamation methods for the coal gangue. The control method comprises the steps: under the condition of selected compacting equipment, firstly, determining critical layering thickness of the coal gangue, then, determining the optimal layering thickness according to an object function model with minimal total compacting times, and finally, calculating filling super high amount; and during construction, carrying out filling by adopting a strip stacking method, and controlling the quality of filling and compacting by adopting a leveling method. The method has the advantages that uniform-thickness layered filling is carried out, and thus, the filling effect is the best; and the uniformity is guaranteed to the maximum, the compacting times are reduced to the maximum, the instability and non-uniform settlement of the gangue are lowered, and the leveling of farmland is guaranteed. Critical thickness control is carried out; during the layered filling, the filling thickness cannot exceed critical thickness, so that the control method is the most effective control method for disadvantageous engineering characteristics of the gangue, and disadvantageous characteristics such as weathering, swelling-shrinkage, spontaneous combustion and corrosion of the gangue are effectively controlled. The filling cost of the coal gangue is reduced; and on one hand, the engineering quality is guaranteed, and on the other hand, the engineering cost is reduced.
Description
technical field [0001] The invention relates to a coal gangue agricultural reclamation method, in particular to a method for controlling the optimum filling thickness of coal gangue. Background technique [0002] Coal gangue is solid waste generated during coal mining and washing. It is used as filling material to fill coal mining subsidence areas or similar low-lying lands, and then reclaim them as agricultural land after covering with soil. This not only enables the treatment and utilization of coal gangue waste, but also reclaims the land damaged by coal mining, so the reclamation of coal gangue filling is widely accepted. However, when a large area of coal gangue is filled for reclamation, the surface often has uneven settlement, which seriously affects the promotion of this technology. At present, the common solution is layered filling and compaction to reduce the porosity of coal gangue, but the key control technologies such as optimal layer thickness and optimal nu...
Claims
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