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本文论述了金川镍矿的试验研究成果。查明用-3毫米戈壁集料破碎砂和水泥配制成高浓度(重量浓度77％)砂浆,借助砂浆的自然压头,通过管道输送到井下,可以满足设计对充填体强度和输送稳定性的要求。通过对砂浆制备站工艺流程的模拟试验,为充填系统的监测和自动控制提供了依据。根据130多次室内半工业性管道输送试验资料,推导出计算水力坡度的经验公式,其平均误差小于10％。用该公式对所收集到的14种不同物料管道水力输送的454组参数和实测值,进行运算和比较,其平均误差为13.6％,证明该公式适用范围广,误差小,比目前所见的经验公式更为准确。此外,文中提出了临界流态浓度的新概念和高浓度的含义。并且发现:在高浓度砂浆管道输送条件下,临界流速已无关紧要;水力坡度与流速之间的变化关系,随着浓度的不断提高而可以看出砂浆的流动状态已从近似牛顿流体变为非牛顿流体而接近于塑性体;而且水力坡度与浓度之间的变化与通常熟知的线性函数关系绝然不同,而是按照高次幂函数关系变化的。
This article discusses the experimental research results of Jinchuan nickel mine. Confirmed with -3 mm Gobi aggregate crushed sand and cement preparation of high concentrations (77% by weight concentration) of mortar, with the natural pressure of mortar, pipelines downhole to meet the design of the filling strength and transport stability Claim. Through the simulation test of the process of mortar preparation station, it provides the basis for the monitoring and automatic control of filling system. According to more than 130 indoor semi-industrial pipeline transportation test data, the empirical formula for calculating hydraulic gradient is deduced. The average error is less than 10%. Using this formula, the 454 parameters and measured values of the hydraulic transmission of the 14 different materials collected in the pipeline were calculated and compared with an average error of 13.6%, which proved that the formula has a wide range of application and small error, Empirical formula is more accurate. In addition, the paper puts forward the new concept of critical fluid concentration and the meaning of high concentration. It is found that the critical flow velocity is irrelevant under the condition of high concentration mortar pipeline transportation. The relationship between hydraulic gradient and flow velocity changes with the increase of concentration. It can be seen that the flow state of mortar has changed from approximate Newtonian fluid to non- Newtonian fluid is close to the plastic body; and the change between hydraulic grade and concentration is obviously different from the commonly known linear function, but according to the higher power function.