Expansion mechanism and control measures of high concentration slurry filling in cavity goaf of coal mine
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摘要: 高浓度浆液在采空区内的充填扩展机制及控制措施是空洞型采空区充填治理需要解决的难题之一。基于此，结合高浓度浆液输送及流变学理论，构建高浓度浆液充填过程模型，揭示其扩展机制，研究充填扩展过程的动力及阻力计算方法，确定充填堆积体形态主要影响因素及控制方法，并通过室外充填试验验证理论成果。结果表明：高浓度浆液充填阻力计算值与实验值相对误差约为5%；浆液的流变参数屈服应力及黏度与管道输送阻力成正比；凝结特性影响浆液堆积体强度增长趋势，凝结过程使浆液在堆积体与顶板间流动时阻力增大；当充填材料及流量不变时，管道输送沿程阻力主要受管道直径及长度影响；局部阻力与管道直径、弯头、变径形式及数量相关，数量越多局部阻力越大；浆液性质、充填路径及注浆工艺是影响充填堆积体形态的主要因素，缩短充填距离、减少管道变径及弯头数量、降低浆液屈服应力及黏度、增大注浆流量及压力有助于浆液扩展至更大范围，反之可使浆液扩展范围减小。成果为空洞型采空区高浓度浆液控制性充填提供依据。Abstract: The filling expansion mechanism and control measures of high concentration slurry in goaf is one of the difficult problems to be solved in the filling treatment of cavity goaf. Based on this, combined with the high concentration slurry transportation and rheological theory, a high concentration slurry filling process model was constructed to reveal its expansion mechanism, the dynamic and resistance calculation methods of filling expansion process were studied, the main influencing factors and control methods of filling accumulation body morphology were determined, and the theoretical results were verified by outdoor filling test.The results show that the the relative error between the calculated value and the experimental value of high concentration slurry filling resistance is about 5%; the rheological parameters yield stress and viscosity of slurry are directly proportional to the pipeline transportation resistance; the strength growth trend of slurry accumulation body is affected by the setting characteristics, and the resistance of slurry flowing between the accumulation body and the roof increases during the condensation process; when the filling material and flow rate remain unchanged, the resistance along the pipeline transportation is mainly affected by The results show that the local resistance is related to the pipe diameter, elbow, diameter change form and quantity, and the more the number, the greater the local resistance; the slurry property, filling path and grouting technology are the main factors affecting the shape of filling accumulation body. Shortening the filling distance, reducing the number of pipe diameter and elbow, reducing the yield stress and viscosity of slurry, and increasing the grouting flow and pressure are helpful The results provide a basis for the controlled filling of high concentration slurry in cavity goaf.
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Keywords:
- cavity type /
- goaf /
- high concentration slurry /
- extension mechanism /
- influence factors /
- control measures
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