Characterisation of coal-mine waste in solid backfill mining in China

Abstract

Recently, issues pertaining to surface disposal of coal-mine wastes, particularly environmental pollution, have been the focus of increasing national and international concern. Solid backfill mining (SBM) method provides environmentally, economically and technically acceptable solutions to these issues by, inter alia, significantly increasing waste-disposal capacities, improving resource recovery rates and reducing levels of ground deformation. In the current study, the physical and mechanical properties of waste rock obtained from seven different locations in China have been described and assessed. A previously developed theoretical solution has been fitted to the nonlinear stress-strain relationship, as derived from testing, resulting in a satisfactorily high level of correlation. Additionally, a basic method for simulation of solid material consolidation via dynamic parameter updates has been expounded and shown to be feasible. Results of the current study may prove extremely useful, particularly in mining applications, engineering design and prediction.

Research Status and Prospects of Coal Seam Gas Content Prediction Based on Mathematical Model

“…Linear Regression Analysis: H.F. Yan(2010) [4] used linear statistical rule and gas geology factor analysis method to determine the main control factors of Peigou mine coal seam gas content, and established the Peigou mine coal seam gas content prediction model with multiple linear regression analysis method. [6] found that the gas concentration prediction model between buried depth and gas content has the problem that estimated values were lower than the actual, and proposed the corresponding monadic linear regression correction model. B.B.…”

Nonlinear Elastic Foundation Plate Model Study on Overlying Strata Movement in Working Face with Solid Backfilling Mining

“…Aimed at emancipating the coal resources and solving the problem of gangue accumulation on the ground surface, solid backfilling technology has been developed by backfilling solid waste like gangue into mined-out areas so as to effectively control strata movement and reduce surface deformation and ensure the safety of ground buildings [4][5][6][7][8]. Involved in the self-organization process of strata movement, the backfilling materials under roof pressure would undergo vertical compression and deformation [9][10][11][12]. Nevertheless, in the process of compression, the backfilling body would play an increasingly supportive role for the roof and hence share part of the overlying strata load.…”

Utilization of Recycled Coal Mining Waste for Road Foundation Layers in Vietnam

“…In China, the amount of coal mining waste (CMW) was 315 million tons for underground coal mining [3]. Therefore, the recycling of industrial wastes as construction materials has been interested in many countries to minimize the environmental impacts caused by the landfill area [4], as well as replacing the natural aggregates for the construction industry [3,[5][6][7][8][9][10][11][12]. Indranratna et.…”

“…CBR values of the specimens compacted at the OMC of 12% using the modified Proctor is 90%, which is much higher than that values achieved for standard Proctor specimens at similar moisture contents (only about 20%). H. Jang [9] also researched the characterization of seven coal-mine wastes in solid backfill mining in China. The results show that the MDD varied within the range 1.636-1.917 g/cm 3 , while OMC ranged from 6.64 to 11.03%.…”