旧采破碎区注浆模拟试验与注浆工艺优化研究

发布时间：2018-04-08 22:28

本文选题：残煤复采　切入点：空巷破碎区　出处：《太原理工大学》2017年硕士论文

【摘要】：本文以圣华煤业1301复采工作面为工程背景,在对矿井旧采巷道赋存调查的基础上,进行了散碎煤岩体注浆试验,分析了浆液在破碎煤岩散体中的扩散规律,提出了复采工作面预注浆工艺。本文主要工作为:1、结合已知矿井资料,采用探测巷掘进与工作面回采的方式对空巷揭露状况进行统计,对圣华煤业1301复采工作面旧采区空巷赋存状况进行分析。根据工作面推进与巷道掘进过程中空巷揭露特征,绘制巷道空巷布置图。2、设计散碎煤岩堆积体注浆试验,通过试验提出浆液扩散分析模型,并对此扩散模型进行理论分析。采用MATLAB科学计算软件对不同注浆压力、水灰比以及渗透系数参数影响下的浆液扩散规律进行线性回归分析,得到了浆液水灰比、注浆压力以及渗透系数三个因素与浆液150mm层位处最大扩散长度、最大喷射长度、注浆量以及结石体抗压强度之间的线性关系,得到各注浆因素影响下四组线性回归方程分别为(?)3、通过建立FLUENT流体分析模型对散碎煤岩堆积体注浆试验模型进行完善,可以推算出浆液最大扩散长度与最大喷射长度的估算值,对试验数据进行优化并得到了相应的线性回归关系式,分别是(?)4、根据浆液扩散线性回归关系式,设计复采区多轮递进注浆工艺。首先对复采破碎区边界进行注浆,实现厚度为3m的密实封堵区,封堵区浆液水灰比为5:1,注浆压力1MPa,注浆孔起点距底板1.6m,孔角17°,全长1.36m,孔间距2.5m。固结区浆液水灰比为7:1,注浆压力为9.5MPa,按照超高水材料浆液的扩散特征设计三轮递进注浆,每轮间隔13.3m,距底板1.5m钻取注浆孔,倾角分别为26°、10°、6°,孔长分别为9.1m、21.9m、35m,单轮注浆钻孔间距为10m,每相邻两轮注浆孔间距为3.3m。5、通过COMSOL数值模拟与注浆效果检测的手段验证了注浆合理性,验证了多轮注浆工艺的合理性,完成注浆加固后的煤壁切割之后较为平滑,且完整性较好,注浆效果良好。
[Abstract]:In this paper, based on the investigation of the occurrence of the old mining roadway, the grouting test of scattered coal and rock mass is carried out on the basis of the engineering background of 1301 remining face of Shenghua Coal Industry, and the diffusion law of the slurry in the broken coal and rock mass is analyzed.The pre-grouting technology in the mining face is put forward.The main work of this paper is: 1, combined with known mine data, using the method of detecting roadway tunneling and mining face to make statistics on the situation of goaf exposure, and to analyze the existing situation of goaf in the old mining area of 1301 remining face of Shenghua coal industry.According to the characteristics of hollow roadway exposure in the process of working face propulsion and roadway excavation, the layout diagram of empty roadway. 2, and the grouting test of scattered coal and rock accumulation body are designed. The slurry diffusion analysis model is put forward through the experiment, and the diffusion model is analyzed theoretically.A linear regression analysis was carried out on the slurry diffusion law under the influence of different grouting pressure, water-cement ratio and permeability coefficient parameters by using MATLAB software, and the water-cement ratio of the slurry was obtained.The linear relationship between grouting pressure and permeability coefficient and the maximum diffusion length, maximum jet length, grouting quantity and compressive strength of stone body at the 150mm layer of the slurry.Four groups of linear regression equations are obtained under the influence of various grouting factors. Through the establishment of FLUENT fluid analysis model to perfect the grouting test model of scattered coal and rock accumulations, the estimated maximum diffusion length and maximum jet length of slurry can be calculated.The experimental data were optimized and the corresponding linear regression formula was obtained, respectively. According to the linear regression equation of slurry diffusion, the multi-wheel progressive grouting process in complex mining area was designed.At first, grouting is carried out on the boundary of remining and crushing area to realize the sealing area with a thickness of 3m. The ratio of water to cement is 5: 1, the grouting pressure is 1MPa, the starting point of grouting hole is 1.6m, the hole angle is 17 掳, the total length is 1.36m, and the hole spacing is 2.5m.In consolidation area, the ratio of water to cement is 7: 1, and the grouting pressure is 9.5 MPA. According to the diffusion characteristics of super-high water material slurry, three rounds of progressive grouting are designed. The interval of each wheel is 13.3 m, and the grouting hole is drilled 1.5 m from the bottom plate.The angle of inclination is 26 掳/ 10 掳/ 6 掳, the length of hole is 9.1 m / 21.9 m / m, the spacing of single wheel grouting hole is 10 m, and the interval between two adjacent grouting holes is 3.3 m 路5 respectively. The rationality of grouting is verified by means of COMSOL numerical simulation and grouting effect test, and the rationality of multi-wheel grouting process is verified.The coal wall after grouting is smooth and complete, and the grouting effect is good.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD265.4

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