本文選題：凍結(jié)法鑿井 + 凍結(jié)孔��； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：近年來在西部地區(qū)煤礦立井的開鑿過程中,廣泛使用全深凍結(jié)技術(shù)穿過軟弱的孔隙、裂隙含水巖層。在全深凍結(jié)鑿井過程中,穿過馬頭門等井筒附屬硐室的凍結(jié)孔在解凍后極易形成豎向?qū)ǖ?進(jìn)而威脅整個(gè)礦井的安全。泥漿置換充填技術(shù)通過在環(huán)空中形成水泥結(jié)石體環(huán)套達(dá)到封堵豎向?qū)ǖ赖哪康?但仍有部分凍結(jié)孔在開展置換充填后,出現(xiàn)了滲漏水狀況,除了可能存在的施工質(zhì)量問題之外,尚不能排除受凍結(jié)冷縮影響,導(dǎo)致的水泥漿結(jié)石體充填段的封水性能劣化現(xiàn)象。因而,本文綜合采用室內(nèi)試驗(yàn)、理論分析、模型試驗(yàn)三種研究手段,開展了膨脹型緩凝水泥漿材料,以及泥漿置換充填段的凍融后抗?jié)B性能研究,以便為凍結(jié)孔泥漿置換充填材料的選擇與優(yōu)化,乃至泥漿置換充填高度的設(shè)計(jì)提供依據(jù)。首先,通過室內(nèi)試驗(yàn)研究了外摻UEA、HEA、AEA三種膨脹劑對(duì)緩凝水泥漿液工作性能的影響,通過自由膨脹率試驗(yàn)分別得到了三種膨脹劑在不同摻量下水泥砂漿試塊的自由膨脹率,驗(yàn)證了膨脹劑的有效性;通過膨脹應(yīng)力試驗(yàn)得到了原配方中復(fù)合外加劑與三種不同摻量的膨脹劑復(fù)合使用時(shí)試件的膨脹應(yīng)力隨養(yǎng)護(hù)齡期的發(fā)展規(guī)律;通過結(jié)石率試驗(yàn)得到了外摻三種不同摻量的膨脹劑對(duì)原配方緩凝水泥漿液材料結(jié)石率的影響;最后通過緩凝時(shí)間試驗(yàn)得到了外摻膨脹劑后緩凝水泥漿液的初凝時(shí)間。其次,通過室內(nèi)試驗(yàn)研究了水泥漿結(jié)石體、凍結(jié)管界面、圍巖界面的抗?jié)B性能,分別得到了膨脹型緩凝水泥漿與非膨脹性緩凝水泥漿液在凍融前后的結(jié)石體滲透系數(shù),單位長(zhǎng)度的“結(jié)石體-圍巖界面”、“結(jié)石體-凍結(jié)管壁界面”的滲透系數(shù),并對(duì)采用不同漿液材料時(shí)的抗?jié)B性能進(jìn)行定量分析。然后,通過理論分析的手段,在合理假設(shè)的基礎(chǔ)上以室內(nèi)試驗(yàn)結(jié)論為基礎(chǔ)推導(dǎo)出了泥漿置換段的整體滲透系數(shù)以及滲透壓、滲流量等水力參數(shù)在兩界面的分布規(guī)律。最后,以室內(nèi)試驗(yàn)結(jié)論和對(duì)泥漿置換段抗?jié)B能力的理論分析為基礎(chǔ),對(duì)比兩種不同的漿液材料,進(jìn)行了三組相似物理模擬試驗(yàn),分別得到并比較了凍融工況下,非穩(wěn)定滲流階段泥漿置換段上部水頭變化對(duì)圍巖界面滲透壓分布規(guī)律的影響,穩(wěn)定滲流階段圍巖界面中的滲流路徑上的壓力梯度、滲流速度;推導(dǎo)出了穩(wěn)定滲流階段圍巖界面滲流路徑上滲透壓與置換段上部水頭的關(guān)系式;并對(duì)原配方緩凝水泥漿液泥漿置換段凍結(jié)管界面的抗?jié)B能力進(jìn)行了定性分析。
[Abstract]:In recent years, in the mining process of coal mine shaft in the western region, the full depth freezing technique is widely used to pass through the weak pore and fissure water-bearing strata.In the process of deep freezing sinking, the freezing hole passing through the auxiliary chamber of the shaft such as Matou Gate is easy to form a vertical guiding water channel after thawing, thus threatening the safety of the whole mine.Mud replacement filling technology can seal the vertical guide water passage by forming cement stone body ring sleeve in the annulus, but there are still some frozen holes that leak after the replacement filling.In addition to the possible construction quality problems, it is not possible to rule out the deterioration of the sealing performance of the cement slurry stone filling section caused by freezing cold shrinkage.Therefore, in this paper, the laboratory test, theoretical analysis and model test are used to study the impermeability of dilated retarded cement slurry and the frozen and thawed filling section.In order to provide the basis for the selection and optimization of the filling materials for the replacement of frozen holes and the design of the filling height for the replacement of the mud.Firstly, the effect of three kinds of expansion agents on the working performance of retarded cement slurry was studied by laboratory test. The free expansion rate of cement mortar was obtained by free expansion test.Through the expansion stress test, the expansion stress of the original formula and three kinds of expansive agent with different amount of expansive agent were obtained by the expansion stress test, and the expansion stress of the specimen was developed with the curing age.The influence of three kinds of expansive agents on the stone rate of the original retarded cement paste was obtained by the calculus rate test, and the initial setting time of the retarded cement slurry after the addition of the expansion agent was obtained by the retarding time test.Secondly, the impermeability of cement slurry stone body, frozen pipe interface and surrounding rock interface is studied through laboratory tests. The permeability coefficient of expansive slow solidified cement slurry and non-expansive retarded cement slurry before and after freeze-thaw is obtained, respectively.The permeability coefficient of "stone body-wall rock interface" and "stone body-frozen pipe wall interface" per unit length is quantitatively analyzed when different slurry materials are used.Then, by means of theoretical analysis and on the basis of reasonable assumptions, the distribution law of hydraulic parameters such as permeability coefficient and hydraulic parameters such as permeability pressure and seepage discharge at the two interfaces are deduced on the basis of the conclusion of laboratory tests.Finally, based on the conclusion of laboratory test and the theoretical analysis of impermeability of mud replacement section, three groups of similar physical simulation tests were carried out by comparing two kinds of different slurry materials, and the results were obtained and compared under freeze-thaw conditions, respectively.The influence of the head change of the upper part of the mud displacement section on the distribution of seepage pressure at the surrounding rock interface in the unstable seepage stage, the pressure gradient and the seepage velocity in the seepage path of the surrounding rock interface in the stable seepage stage;The relationship between the seepage pressure on the seepage path of the surrounding rock interface and the head of the upper displacement section is derived, and the impermeability of the frozen pipe interface of the original formulation retarded cement slurry replacement section is analyzed qualitatively.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD265.3

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