本文選題：沿空留巷 + 可控關(guān)鍵帶��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：本論文以石泉煤礦30105工作面實(shí)際地質(zhì)條件為依據(jù),采用理論分析、室內(nèi)實(shí)驗(yàn)結(jié)合數(shù)值模擬的方法,對(duì)沿空留巷覆巖運(yùn)動(dòng)和結(jié)構(gòu)演化規(guī)律、留巷圍巖受力情況、自鎖實(shí)體墻結(jié)構(gòu)設(shè)計(jì)和穩(wěn)定性以及巷旁支護(hù)體結(jié)構(gòu)參數(shù)對(duì)留巷穩(wěn)定性的影響進(jìn)行了系統(tǒng)分析,得出的主要結(jié)論如下:(1)根據(jù)沿空留巷覆巖運(yùn)動(dòng)規(guī)律及覆巖“大、小結(jié)構(gòu)”理論,系統(tǒng)分析了沿空留巷頂板應(yīng)力傳遞機(jī)制,提出了留巷圍巖“可控關(guān)鍵帶”理論,“可控關(guān)鍵帶”是由巷旁支護(hù)體、實(shí)體煤幫、巷道頂?shù)装逋ㄟ^巷內(nèi)、巷旁支護(hù)共同組成留巷穩(wěn)定維護(hù)系統(tǒng),通過對(duì)各部位的合理控制,可有效保證沿空留巷的穩(wěn)定性。(2)分別對(duì)留巷圍巖各支護(hù)結(jié)構(gòu)構(gòu)建了力學(xué)模型,并對(duì)其進(jìn)行受力分析,本文將具有不同剛度的巷旁支護(hù)體、直接頂、底板看作巷旁支護(hù)系統(tǒng),構(gòu)建了巷旁支護(hù)系統(tǒng)力學(xué)模型,分析了巷旁支護(hù)系統(tǒng)總變形量S與系統(tǒng)剛度k的關(guān)系以及各分部剛度對(duì)巷旁支護(hù)系統(tǒng)變形的影響。(3)采用相似材料模擬實(shí)驗(yàn)對(duì)綜放沿空留巷在不同影響階段時(shí)巷道圍巖的應(yīng)力及變形規(guī)律進(jìn)行了研究,兩次采動(dòng)超前支承壓力都對(duì)巷道圍巖變形產(chǎn)生較大影響且二次采動(dòng)對(duì)留巷圍巖穩(wěn)定性影響更嚴(yán)重,留巷后工作面傾斜方向殘余支承壓力會(huì)對(duì)墻體傾斜方向的穩(wěn)定性產(chǎn)生較大影響。(4)基于對(duì)現(xiàn)有巷旁支護(hù)體優(yōu)缺點(diǎn)的詳細(xì)分析,設(shè)計(jì)了混凝土預(yù)制塊自鎖實(shí)體墻,通過solidworks三維模擬軟件詳細(xì)模擬了墻體砌塊結(jié)構(gòu)及其砌塊排列方式,并通過FLAC3D數(shù)值模擬軟件對(duì)自鎖實(shí)體墻穩(wěn)定性進(jìn)行模擬分析,得出自鎖實(shí)體墻穩(wěn)定性優(yōu)于普通組裝墻。(5)采用FLAC3D數(shù)值模擬軟件,模擬分析留巷圍巖穩(wěn)定性隨工作面推進(jìn)的動(dòng)態(tài)變化規(guī)律,全面分析了巷旁支護(hù)體的強(qiáng)度、寬度及其結(jié)構(gòu)對(duì)留巷圍巖穩(wěn)定性的影響。研究結(jié)果表明,巷旁支護(hù)體強(qiáng)度、寬度越大,留巷圍巖越穩(wěn)定,但存在成本高,進(jìn)度慢等缺點(diǎn),從安全與經(jīng)濟(jì)的角度綜合確定了巷旁支護(hù)體強(qiáng)度與寬度;接頂讓壓材料具有保證墻體整體強(qiáng)度的同時(shí),又使巷旁支護(hù)體具有適當(dāng)?shù)目勺冃涡?更有利于巷旁支護(hù)墻體的穩(wěn)定。
[Abstract]:Based on the actual geological conditions of 30105 working face in Shi Quan Coal Mine, this paper adopts theoretical analysis, laboratory experiment and numerical simulation method to analyze the law of overburden rock movement and structure evolution along goaf roadway, and to analyze the stress of surrounding rock in retaining roadway. The structural design and stability of self-locking solid wall and the influence of structural parameters of roadway brace on the stability of retaining roadway are systematically analyzed. The main conclusions are as follows: 1) according to the law of overburden movement along gob and the theory of "large and small structure" of overburden rock, The stress transfer mechanism of roof along goaf is analyzed systematically, and the theory of "controllable critical zone" of surrounding rock is put forward. The theory of "controllable critical zone" is composed of side support of roadway, solid coal side, roof and floor of roadway passing through roadway. The stability maintenance system of retaining roadway is composed of roadway side support. Through reasonable control of each part, the stability of roadway along goaf can be effectively guaranteed. The mechanical model of each supporting structure in surrounding rock of retaining roadway is constructed respectively, and the mechanical analysis is carried out on it. In this paper, the roadway side support body with different stiffness is regarded as the roadway side support system, and the mechanical model of the roadway side support system is constructed. The relationship between the total deformation of roadway side support system S and the system stiffness k and the influence of each segment stiffness on the deformation of roadway side support system are analyzed. The similar material simulation experiment is used to simulate the roadway in different stages of influence on the roadway along the gob of fully mechanized caving. The stress and deformation of surrounding rock are studied. The second mining advance bearing pressure has a great influence on the surrounding rock deformation of roadway, and the secondary mining has more serious influence on the stability of retaining roadway surrounding rock. The residual supporting pressure in the inclined direction of the working face behind the roadway will have a great influence on the stability of the inclined direction of the wall. (4) based on the detailed analysis of the advantages and disadvantages of the existing roadway side support support, a concrete precast self-locking solid wall is designed. The wall block structure and its arrangement are simulated in detail by solidworks software, and the stability of self-locking solid wall is simulated and analyzed by FLAC3D numerical simulation software. It is concluded that the stability of self-locking solid wall is superior to that of the ordinary assembled wall. The stability of retaining roadway surrounding rock is simulated by FLAC3D software, and the dynamic variation law of surrounding rock stability with the advance of working face is analyzed, and the strength of retaining body by roadway side is analyzed comprehensively. The influence of width and structure on the stability of surrounding rock. The results show that the strength and width of side support are more stable, but the cost is high and the progress is slow. The strength and width of side support are determined comprehensively from the point of view of safety and economy. The compaction material of connecting roof can guarantee the whole strength of wall, at the same time, it can make the retaining body of roadway side have proper deformability, which is more beneficial to the stability of wall of roadway side support.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD353

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