本文選題：注漿材料　切入點(diǎn)：煤巖體　出處：《中國礦業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：深埋煤巖體在較高的地應(yīng)力作用和地質(zhì)活動的影響下自身存在大量的裂隙與節(jié)理、割理,在巷道掘進(jìn)及工作面回采過程中,應(yīng)力的重分布及回采動壓會加劇煤巖體的變形破壞,影響巷道的穩(wěn)定及工作面的安全回采。注漿加固是巖土工程中常用的加固技術(shù)手段,可以有效提高加固對象的物理力學(xué)參數(shù),提高巖土體的自承載力。本文以晉煤集團(tuán)趙莊煤業(yè)為背景,針對破碎及裂隙煤巖體的注漿加固問題,通過試驗(yàn)研究、理論分析、數(shù)值模擬和現(xiàn)場工程試驗(yàn)等方法對煤巖體的注漿材料性能、加固效果、注漿參數(shù)影響因素、滲透與劈裂注漿共同作用機(jī)制等問題進(jìn)行了研究,主要得出以下幾點(diǎn)成果:(1)通過室內(nèi)試驗(yàn)對普通水泥、粉煤灰水泥和超細(xì)水泥的流變性、穩(wěn)定性和凝結(jié)硬化性能進(jìn)行了研究。獲得了各型水泥在不同水灰比及不同時間下的流變性、結(jié)石率和2 h析水率;獲得了漿液結(jié)石體的全應(yīng)力-應(yīng)變曲線、彈性模量、強(qiáng)度值;根據(jù)超細(xì)水泥強(qiáng)度擬合曲線獲得其3 d、7 d和28 d養(yǎng)護(hù)齡期下的強(qiáng)度變化經(jīng)驗(yàn)公式;總結(jié)了結(jié)石體試件的破壞形式并分析了成因。(2)通過對煤樣和泥巖試樣進(jìn)行基本物理力學(xué)試驗(yàn),獲得了煤和泥巖的單軸抗壓強(qiáng)度、殘余強(qiáng)度、抗拉強(qiáng)度、內(nèi)聚力和內(nèi)摩擦角等值�；跐{液材料試驗(yàn)和物理力學(xué)試驗(yàn),對破碎和裂隙煤巖體進(jìn)行了注漿加固試驗(yàn),獲得了不同破碎程度和漿液強(qiáng)度條件下各注漿加固體的應(yīng)力應(yīng)變曲線,并對其強(qiáng)度、彈性模量、變形規(guī)律和破壞模式等進(jìn)行了分析研究,得到了漿液強(qiáng)度和煤巖體破碎程度對注漿加固體的影響規(guī)律、煤巖體注漿的合理漿液強(qiáng)度指標(biāo),分析研究了漿液結(jié)石體強(qiáng)度不同時其加固體的應(yīng)力應(yīng)變曲線形式及變形破壞規(guī)律。(3)基于牛頓流體運(yùn)動規(guī)律對單裂隙中漿液的擴(kuò)散規(guī)律與控制參數(shù)進(jìn)行了研究;基于彈性力學(xué)理論計算了使注漿孔孔壁在漿液壓力和地應(yīng)力作用下發(fā)生劈裂破壞的注漿壓力值;基于損傷斷裂力學(xué)理論分析計算了使裂隙發(fā)生擴(kuò)展的漿液壓力值及裂隙擴(kuò)展長度。采用Abaqus分別計算了巷道埋深、水平構(gòu)造應(yīng)力場、巷道尺寸等因素對巷道與工作面劈裂注漿所需注漿壓力的影響規(guī)律,并根據(jù)計算結(jié)果分析了注漿孔在無注漿壓力下的自動開裂范圍;分析了不同條件下圍巖劈裂與擴(kuò)展所需注漿壓力的關(guān)系。(4)針對趙莊礦回采工作面切眼易出現(xiàn)煤幫片幫和頂板冒落以及輔助巷道的變形破壞問題,利用Abaqus對其工作面與巷道注漿合理控制參數(shù)進(jìn)行了計算,提出了巷道與工作面注漿加固的技術(shù)方案與建議。
[Abstract]:Under the influence of high ground stress and geological activity, there are a large number of fractures and joints in deep buried coal and rock mass. In the process of roadway excavation and face mining, the stress redistribution and mining dynamic pressure will aggravate the deformation and destruction of coal and rock mass. The stability of roadway and the safety of mining face are affected. Grouting reinforcement is a commonly used reinforcement technique in geotechnical engineering, which can effectively improve the physical and mechanical parameters of the strengthened object. Taking Zhaozhuang Coal Industry of Jin Coal Group as the background, aiming at the problem of grouting reinforcement of broken and fractured coal and rock mass, this paper makes theoretical analysis through experimental study. Numerical simulation and field engineering tests have been carried out to study the performance of grouting materials, reinforcement effect, influencing factors of grouting parameters, and the interaction mechanism of permeation and split grouting of coal and rock mass. The main results are as follows: (1) the rheological properties of ordinary cement, fly ash cement and ultrafine cement are tested in laboratory. The stability and setting and hardening properties of cement were studied. The rheology, stone rate and 2 h water evolution rate of different cement types under different water / cement ratio and different time were obtained, and the total stress-strain curve, elastic modulus and strength value of slurry stone were obtained. According to the fitting curve of superfine cement strength, the empirical formula of strength change was obtained under the curing age of 3 days and 28 days, and the failure form of stone specimen was summarized, and the origin of stone sample was analyzed. The basic physical and mechanical tests were carried out on coal sample and mudstone sample. The uniaxial compressive strength, residual strength, tensile strength, cohesion force and angle of internal friction of coal and mudstone are obtained. The stress-strain curves of different grouting and solid were obtained under different crushing degree and slurry strength, and the strength, elastic modulus, deformation law and failure mode were analyzed and studied. The influence law of slurry strength and coal rock mass fragmentation on grouting and solid is obtained, and the reasonable grouting strength index of coal and rock mass grouting is obtained. The stress-strain curve and deformation and failure law of slurry stone with different strength are analyzed and studied. Based on Newtonian fluid motion law, the diffusion law and control parameters of slurry in a single fissure are studied. Based on the elastic theory, the grouting pressure value of the grouting hole wall under the action of grouting pressure and in-situ stress is calculated. Based on the theory of damage and fracture mechanics, the pressure value of slurry and the length of crack propagation are calculated. The buried depth and horizontal tectonic stress field of roadway are calculated by Abaqus, respectively. The influence of roadway size on grouting pressure required by splitting grouting in roadway and working face is studied, and the automatic cracking range of grouting hole under no grouting pressure is analyzed according to the calculation results. This paper analyzes the relationship between surrounding rock splitting and grouting pressure required for expansion under different conditions. (4) aiming at the problems of coal side and roof caving and auxiliary roadway deformation and destruction in Zhaozhuang mining face, the cutting hole is easy to occur. The reasonable control parameters of grouting in working face and roadway were calculated by Abaqus, and the technical scheme and suggestion of grouting reinforcement in roadway and working face were put forward.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD353

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本文編號：1625315