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以充填体的电阻率特性为基础,提出了电阻率膏体充填效果评价方法。以新阳煤矿膏体充填开采为具体的工程背景,计算受顶板垂直应力作用下充填体在1,3和7 d的电阻率分别为6.73,27.74和55.15Ω·m,并建立了电阻率的正演模型,通过反演计算视电阻率剖面图,分析视电阻率曲线形态及数值变化特征,在充填开采过程中利用电阻率充填效果评价方法对充填效果进行评价。视电阻率剖面图结果表明:充填体早期表现为强烈的低阻响应异常特征,随着充填开采的进行,响应逐渐减弱,对应充填范围内的视电阻率曲线形态呈上升趋势,数值升高;现场实际评价得到的视电阻率剖面图与井下充填的实际效果相对应,并与正反演数值模拟反映的视电阻率剖面图的结果一致。
Based on the resistivity of the filling body, a method of evaluating the filling effect of the resistivity paste is proposed. Taking the concrete filling of Xinyang coal mine as a concrete engineering background, the resistivities of the filling body at 1, 3 and 7 days under the vertical roof stress were calculated as 6.73, 27.74 and 55.15Ω · m, respectively, and the resistivity Forward modeling, the apparent resistivity profile was calculated by inversion, the shape and numerical variation characteristics of apparent resistivity curve were analyzed, and the filling effect was evaluated by the method of resistivity filling effect during the filling and mining process. The results of apparent resistivity profile show that the filling body behaves as a strong low resistivity anomaly characteristic in the early stage. With the development of filling and mining, the response decreases gradually, and the apparent resistivity curve in the corresponding filling range shows an upward trend and increases in value. The actual resistivity profile obtained from the field evaluation corresponds to the actual effect of downhole filling and is consistent with the result of the apparent resistivity profile reflected by numerical simulations of forward and inversion.