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Study of the roof behavior in longwall gob in long-term condition

机译：长期条件下长壁采空区顶板特性研究

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Assessment of the roof behavior in longwall gob and estimation of the occurrence of caving and fracturing zones above mined panels are the main factors used in evaluating abutment stresses, ground subsidence, face support and adjacent structures design. The combined height of caving and fracturing zones is taken as equivalent to the height of destressed zone (HDZ) in this study. The long-term estimation of this height plays a key role in accurate determination of maximum ground surface subsidence and the amount of transferred loads towards the neighboring solid sections. In this paper, the roof behavior in longwall gob has been studied in long-term condition. For this purpose, a time-dependent model based on the energy balance in longwall mining combined with a rheological model of caved materials with time-varying parameters was used to calculate HDZ. Also, parametric study was conducted to evaluate the effects of geometrical and geomechanical parameters on the roof caving and fracturing. Moreover, the calculated HDZ from the current study is compared with the results of the existing numerical, analytical and empirical models and the in-situ measurements reported in literatures. Comparative study confirms a good agreement that exists between the results of the present study with those of the in-situ measurements and empirical models. It can be concluded that the results of this research can be successfully used to evaluate HDZ in longwall gob in long-term condition to determine the induced stress and surface subsidence in longwall mining.
机译：评估长壁采空区顶板特性以及评估开采面板上方崩落和破裂区域的发生是评估桥基应力，地面沉降，面支撑和邻近结构设计的主要因素。在本研究中，将崩落带和压裂带的组合高度等同于减压区（HDZ）的高度。对该高度的长期估算在准确确定最大地面沉降和向相邻实心部分的转移荷载量中起着关键作用。本文对长壁采空区的顶板特性进行了长期研究。为此，基于长壁开采中能量平衡的时变模型与带时变参数的溶洞材料流变模型相结合，用于计算HDZ。此外，进行了参数研究，以评估几何参数和岩土力学参数对顶板崩落和压裂的影响。此外，将当前研究中计算出的HDZ与现有数值，分析和经验模型的结果以及文献报道的现场测量结果进行比较。对比研究证实了本研究结果与现场测量结果和经验模型之间的良好一致性。可以得出结论，这项研究的结果可以成功地用于评估长期条件下长壁采空区的HDZ，以确定长壁开采的诱发应力和地表沉陷。

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