采动覆岩离层注浆工程数值模拟及试验研究

Numerical simulation and experimental study of overburden separated layer grouting engineering

采动覆岩离层注浆技术能够有效降低煤矿开采过程中所产生的地面位移。为研究该技术注浆参数对地面沉降的影响,以赵庄二号井的307工作面为例,采用室内模型试验和数值分析两种方法,分别研究采动过程中覆岩离层的动态变化过程以及不同的注浆参数对地面位移的影响。结果表明:覆岩离层的发展可分为离层产生、离层延伸、离层稳定、离层衰减、离层闭合5个过程;随着注采比的增加,地面沉降和倾斜变形逐渐减小;随着注浆位置的上升与开采面宽度的增加,地面沉降和倾斜变形逐渐变大。

The technology of mining overburden separated layer grouting can effectively reduce the ground displacement produced in the process of coal mining.In order to study the effect of grouting parameters on ground settlement,two methods of indoor model test and numerical analysis were used to study the effect of grouting parameters,the dynamic process of overburden separation and the effect of different grouting parameters on ground displacement were studied respectively.The results showed that the development of overburden separation could be divided into five processes:separation generation,separation extension,separation stability,separation attenuation and separation closure;with the increase of injection-production ratio,land subsidence and tilt deformation gradually decreased;with the rise of grouting position and the increase of mining face width,the ground subsidence and tilt deformation also gradually became larger.