Experimental Study And Application Of Clay Filling Process Of Daxiangshan Copper Mine

With the development of mineral resources exploitation technology, no waste mining has become the inevitable trend in the development of mining technology. Open stoping later continuous mining technology with high production efficiency and large intensity of resource recovery, save backfilling materials storage places, reducing environmental pollution, reduce the dilution loss index, effective control of the advantages of the mining ground pressure, more and more get people’s attention. This process could be divided into step ore phase, and the second step chamber mining step room first, and postharvest cementation filling, after waiting for the condensation, recovery step 2 room again, postharvest sand filling with water. Because step cementing filling body stability is affected by its shape dimension and complex stress environment, make the strength of the reasonable design ensure the stability of cementing filling body in mining process as the successful application of key technical problems.B88-92-3 panel Da Hongshan copper mine, the jejunum is made between flat-back cut and fill stoping, panel design level 70 m, length of 89 m, width of 30 m. For saving the cost of filling, central panel pillar design width is just 10 m, backfilling materials using block stone cementing filling. The cementing pillar 7:1 ratio of high to width, aspect ratio is 3:1, for the typical "high, narrow and long cementing pillar", affected by the external dimensions cementing pillar required high strength. Based on the actual mining of mining sequence, cementing pillar has exposed in the panel mining process of 2 times, unilateral airport surface is high, the exposed area is larger. The early stage of the panel mining process, the cementing pillar for independence, the late not only requires self-reliance while carrying sand, lateral pressure at the top of the rock mass stress and water stress environment is complicated.Papers to a Da Hongshan B88-92-3 panel cementing pillar strength design as the research background, summarizes the method to determine the strength of cementing filling body at home and abroad, divided into experience analogy method, the intensity model method and numerical analysis method. By the analysis that:(1) insufficient experience analogy method is scientific, with strong subjectivity; (2) the strength of the applicable conditions of the single model method, can only calculate "self-reliance" or "carry" cementing pillar of strength calculation, cannot calculate the strength of the cemented filling body under complicated stress environment. Therefore, the paper adopts the numerical simulation method to calculate B88-92-3 panel cementing pillar strength required. First of all, using the algorithm of elastic determine cementing pillar strength parameters under the limit equilibrium state; Secondly based on the parameters of the scheme in the elastic, elastic-plastic numerical analysis, confirmed the B88-92-3 panel cementing pillar in the strength parameters for 31 ° 0.8 Mpa cohesion, internal friction Angle under the condition of stable, and through the Mohr-coulomb criterion to calculate the maximum strength needed for cementing pillar is 2.77 Mpa.On the basis of determine cementing pillar strength, in the empty zone has been identified through experimental analysis under the first stone, cement slurry or after filling material under way at the same time, to carry out half a industrial experiments to determine the proportion of cement slurry. Cementing slurry in cement content of 300 kg/m after, the concentration of 70%-72% of the conditions, not only can realize pipeline gravity, stone and cement slurry package works best. Due to high cementing pillar, impossible to achieve a pack, according to the height of the penetration of cementing slurry in stone (5 m), the cementing pillar design for layered filling body in the overall height, height of 5 m.In the thesis design parameters to carry out the industrial test. Industrial practice shows that Da Hong Shan B88-92-3 panel cementing pillar in the process of panel mining out of stability and unity, and provides a safe and reliable operation panel mining environment. Proves the rationality of the design strength parameters in the paper.The paper not only solve the problem of strength design of cementation-pillar which in the complicated stress environment strength design but also offer the plan to confirm the strength of cement pillar for Da Hongshan copper mine. At the same time also offer the technical support to reduce the usage of concrete and save the producing cost, has the promotion value.