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Flow Behaviour of Pond Ash Slurry and Shrinkage of Pond Ash Stowed Mine Area

机译：池灰淤浆的流动特性和池灰存放矿区的收缩

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摘要

Backfilling enables complete or around ninety percent extraction of coal from the seam and then filling the mine voids with mill tailings; sand or excavated stones etc. which provides additional ground support by constraining lateral deformation of surrounding coal pillars and roof. However the overall feasibility of the backfill operation with different materials has to be studied in detail. The objective of this project is to evaluate the suitability of using pond-ash as backfill material over fly ash and sand in respect to shrinkage of the stowed area. The shrinkage study is done with the help of numerical modeling in FLAC of a mine KTK-5 where pond-ash stowing is going to be implemented. The physical properties like bulk modulus, shear modulus, cohesion, friction angle etc. were also found out through experiments which are required during the numerical modeling. Moreover an effort has also been made to develop comprehensive flow model using CFD and then use the model for predicting pressure drop, volume fraction etc. A 20m pipe with diameter of 20cm is modeled, through which flow is conducted where modeling and meshing is done using ANSYS Fluent. High viscosity fly and pond ash slurry with different concentrations up to 70% by weight of pond ash is passed and for each concentration different velocities are used and pressure drops is calculated. MDD ranges from 1.07gm/cc to 1.27gm/cc. With increase in compaction energy MDD increases due to the closer packing of pond ash particles and OMC decreases from 38% to 28% approx. which might be due to the increase in moisture content leading to less friction between the particles and promoting compact packing with increase in compaction which in turn decreases voids and increase saturation limit. The settling rate for the sample is found to be around 30% with water-liquid (phase1) and pond-ash (phase2). Velocity of 3.5m/s of the paste are optimum with respect to pressure drop. The FLAC simulation yields factor of safety (FOS) after excavation of one pillar with no fill to be 1.5 whereas with pond ash fill it is 2.7. Similarly FOS after stowing with pond ash in the voids of two pillars was found to be 2.5 whereas without fill it was 1.2. After excavation of two and half pillars FOS was calculated to be 1.9 with pond ash fill and 1.0 without fill.
机译：回填可以从煤层中完全或约90％抽取煤，然后用磨机尾矿填充矿井空洞；沙子或挖掘的石头等，通过限制周围煤柱和顶板的横向变形来提供额外的地面支撑。但是，必须详细研究使用不同材料进行回填操作的总体可行性。该项目的目的是评估在存放区域的收缩方面，使用池塘灰作为粉煤灰和沙子的回填材料的适用性。收缩研究是在KTK-5矿井的FLAC数值模拟的帮助下完成的，该矿井将进行池灰的储存。还通过数值建模过程中需要的实验找到了诸如体积模量，剪切模量，内聚力，摩擦角等物理性质。此外，还努力开发了使用CFD的综合流模型，然后将其用于预测压降，体积分数等。对直径为20cm的20m管道进行建模，并使用该模型进行建模和网格划分。 ANSYS流利。使高浓度的粉煤灰和池塘灰浆通过浓度达到池塘灰粉重量的70％，然后通过，每种浓度使用不同的速度，并计算压降。 MDD范围为1.07gm / cc至1.27gm / cc。随着压实能量的增加，MDD由于池灰颗粒的更紧密堆积而增加，OMC大约从38％降低到28％。这可能是由于水分含量的增加导致颗粒之间的摩擦减少，并随着压实度的增加而促进了紧密堆积，进而减少了空隙并增加了饱和度极限。发现在水-液（阶段1）和池灰（阶段2）下，样品的沉降率约为30％。相对于压降，糊剂的速度为3.5m / s是最佳的。开挖一根没有填充的柱子后，FLAC模拟得出的安全系数（FOS）为1.5，而带池塘灰填充的是2.7。类似地，用池塘灰分沉积在两个支柱的空隙中后的FOS为2.5，而未填充时的FOS为1.2。开挖两根和一半的支柱后，FOS计算为有池塘灰填充的FOS为1.9和没有填充灰的FOS为1.0。

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    Sahoo Jyoti Prakash;

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  • 年度 2015
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