本文選題：斷層注漿 + 管道-裂隙雙重介質��； 參考：《安徽理工大學》2017年碩士論文

【摘要】：斷層不僅使得礦井水文地質條件復雜化,還會降低工程巖體的穩(wěn)定性,是礦井突水的主要誘發(fā)因素之一。另外,斷層破碎帶往往成為地下水的賦存區(qū)間和運移通道。張集煤礦Fs866為西二采區(qū)邊界斷層,落差25～60m,延展長度2412m,對A組煤1413A首采工作面的安全回采構成嚴重威脅。為保證工作面的安全回采,在分析A組煤開采水文工程地質條件的基礎上,對Fs866斷層帶進行注漿改造。為驗證斷層注漿的效果,本文將注漿對象(斷層破碎帶及影響帶)視為"管道-裂隙"雙重介質,建立了斷層注漿水文地質概念模型;采用多場耦合的方法將注漿實際中存在的動水條件、高地應力、裂隙和孔隙水壓、注漿壓力等要素綜合考慮在內。應用Comsol Multiphysics軟件被利用于模擬漿液的運移擴散規(guī)律,并從漿液滲透的動態(tài)過程、漿液擴散斷面、單注漿孔漿液擴散半徑和裂隙流體平均密度變化四個方面對模擬結果進行分析。另外,論文從鉆孔水量、水溫、水壓的變化,吸水率、物探成果、P-Q曲線分析和鉆孔取芯檢查等實際指標出發(fā),利用多元信息擬合對注漿效果進行了綜合評價。研究結果表明:(1)研究對象Fs866斷層帶具有一定的含、導水性,為了避免開采擾動引起斷層"活化"對Fs866斷層帶進行注漿加固,最終在斷層帶形成注漿帷幕,達到堵水加固效果。(2)漿液以注漿孔為中心呈近似圓環(huán)狀分布,擴散半徑與時間呈正相關,而擴散速度在逐漸減小,并最終趨于零。(3)斷層影響帶的漿液擴散范圍處于斷層破碎帶和完整巖層之間,且裂隙發(fā)育程度越大,漿液受到的滲流阻力越小,擴散速度越大,擴散的范圍也越大。經分析,模擬擴散半徑與理論計算誤差控制在10%左右,結果基本吻合。(4)對斷層帶注漿效果的單因素和多因素的綜合分析,顯示注漿效果良好,達到堵水加固目的,再次驗證了數(shù)值模擬結論的正確性。為今后類似注漿工程提供了科學指導。
[Abstract]:Fault not only complicates the hydrogeological conditions, but also reduces the stability of engineering rock mass, which is one of the main inducing factors of mine water inrush.In addition, fault fracture zone is often used as the storage zone and migration channel of groundwater.The Fs866 of Zhangji Coal Mine is a boundary fault in the west second mining area with a drop of 2560 m and an extension length of 2412 m.This poses a serious threat to the safe mining of 1413A first mining face of Group A.In order to ensure the safe mining of coal face, the grouting reformation of Fs866 fault zone is carried out on the basis of analyzing hydrogeological conditions of group A coal mining.In order to verify the effect of fault grouting, the grouting object (fault fracture zone and influence zone) is regarded as "pipe-fissure" dual medium in this paper, and the hydrogeological conceptual model of fault grouting is established.The dynamic water condition, high ground stress, fracture and pore water pressure, grouting pressure and so on are taken into account by multi-field coupling method.Comsol Multiphysics software is used to simulate the migration and diffusion law of slurry. The simulation results are analyzed from four aspects: the dynamic process of slurry permeation, the slurry diffusion section, the dispersion radius of single grouting hole and the average density of fractured fluid.In addition, based on the actual indexes of water quantity, water temperature, water pressure, water absorption, P-Q curve analysis of geophysical exploration results and coring inspection of boreholes, the grouting effect is comprehensively evaluated by multivariate information fitting.The results show that the Fs866 fault zone has a certain content and water conductivity. In order to avoid the fault "activation" caused by mining disturbance, the Fs866 fault zone is reinforced by grouting, and finally grouting curtain is formed in the fault zone.To reach the effect of water plugging and reinforcement.) the grouting fluid has a circular distribution centered on the grouting hole, the diffusion radius is positively correlated with time, and the diffusion velocity is gradually decreasing.Finally, the range of slurry diffusion in the zone affected by fault is between the fault fracture zone and the whole rock layer, and the greater the degree of fracture development, the smaller the seepage resistance of the slurry, the greater the diffusion velocity and the wider the diffusion range.Through the analysis, the simulated diffusion radius and the theoretical calculation error are controlled at about 10%, and the results basically agree with each other. The comprehensive analysis of single factor and multiple factors of grouting effect in fault zone shows that the grouting effect is good, and the purpose of water plugging and strengthening is achieved.The correctness of the numerical simulation results is verified again.It provides scientific guidance for similar grouting projects in the future.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD745.2

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