论文部分内容阅读
针对矿区生态环境保护,资源和环境协调开发的可持续发展观,保水采煤思想应运而生.为实现保水采煤这一重要主题,提出了隔水关键层的基本概念,通过建立隔水关键层力学模型,综合运用实验研究、理论分析、数值模拟等研究手段,系统分析了隔水关键层的基本力学特性及隔水性能,并将基于隔水关键层的保护原理成功运用到保水采煤的工程实践.提出基于隔水关键层的保水采煤原理.在岩层控制的结构关键层概念和传统的隔水层概念基础上提出了隔水关键层的基本概念,并阐述了其包含的3层含意.建立了隔水关键层的基本力学模型,并对其进行结构稳定性分析.建立了层状岩体渗流的非线性动力学模型,考察了隔水关键层渗流系统的平衡态特征,并给出了隔水关键层渗流系统的失稳判别条件.在传统物理模型试验的基础上,引入了数字图像相关法这一先进的分析手段,使试验布置更为简洁,同时可以进行位移场、应变场等全场力学特性分析,从而定量的再现了覆岩运动的全过程.从结构稳定性角度分析了隔水关键层的隔水性能,为实现保水采煤提供借鉴.采用数值模拟研究手段,基于岩石渗流-损伤耦合模型,模拟了隔水关键层的岩层移动及裂隙演化特征,同时系统分析了贯通裂隙与渗流分布的基本特征,并对渗流量进行了详细的统计和比较,总结隔水关键层的隔水性能.运用隔水关键层原理成功地在神东矿区开展了保水采煤实践,初步建立适合神东矿区的保水采煤模式.针对神东矿区某2个工作面的地质条件,建立数值分析及理论分析模型,通过数值模拟及理论计算,分析出覆岩中隔水关键层的基本特征.
In response to the sustainable development concept of coordinated development of ecological environment and resources and environment in the mining area, the thought of water conservation and coal mining came into being.In order to realize the important theme of water-conserving coal mining, the basic concept of water-blocking key layer was put forward, Layer mechanics model, the paper comprehensively uses the experimental research, theoretical analysis, numerical simulation and other research methods to systematically analyze the basic mechanical properties and water-proofing properties of the key layers of water-proofing and apply the protection principle based on the key layers of water- The paper put forward the water-saving and coal-mining principle based on the key layer of water-proofing.It put forward the basic concept of water-barrier key layer based on the concept of structure-critical layer and the traditional concept of water- Layer, the basic mechanics model of water-critical key layer is established and its structural stability is analyzed.The nonlinear dynamic model of seepage in layered rock mass is established and the equilibrium state characteristics of seepage system in critical water- And gives the condition of instability of critical seepage system of water barrier.Based on the traditional physical model test, this paper introduces the advanced analytical hand of digital image correlation , The test layout is more concise, and the mechanics characteristics of the whole field, such as displacement field and strain field, can be analyzed at the same time so as to quantitatively reproduce the whole process of overlying strata movement.From the structural stability point of view, Which can be used as a reference for the realization of water-conserving coal mining.Based on the numerical simulation method and the coupled seepage-damage model of rock, the strata movement and fracture evolution characteristics of critical water-tight layers are simulated and systematically analyzed the basic characteristics of through-fractures and seepage distribution , And carried out a detailed statistical and comparison on the seepage volume to summarize the water-barrier performance of the critical water-barriers.The water-saving and coal-mining practice was successfully carried out in the Shendong mining area by using the key water-barrier principle, and the water holding capacity suitable for the Shendong mining area Coal mining mode.According to the geological conditions of two working faces in Shendong Mining Area, numerical analysis and theoretical analysis model are established, and the basic characteristics of water-blocking key layers in overlying strata are analyzed by numerical simulation and theoretical calculation.