本文選題：TBM斜井 + 統(tǒng)一強(qiáng)度理論��； 參考：《中國礦業(yè)大學(xué)(北京)》2017年博士論文

【摘要】：近年來,隨著煤礦開采技術(shù)的發(fā)展,礦井開采深度日益增大,煤礦產(chǎn)能不斷提高,開采過程中遇到的各種問題逐漸增多,斜井開拓逐漸成為提高礦井產(chǎn)能的主要提升方式;TBM施工以其高效、優(yōu)質(zhì)、安全等優(yōu)點(diǎn)逐漸成為斜井建設(shè)的重要手段。進(jìn)行長距離、大埋深TBM斜井施工是我國煤炭建設(shè)中的一大挑戰(zhàn),施工過程中會遇到多種不可預(yù)測的問題,對長距離斜井開挖后圍巖穩(wěn)定性進(jìn)行研究,對工程安全具有重要意義,但現(xiàn)有相關(guān)研究較少,是目前亟待解決的問題。本文針對TBM斜井建設(shè)中遇到的大坡度、大埋深、穿越復(fù)雜地層等問題,以神華新街能源公司臺格廟礦區(qū)TBM斜井工程為依托,采用理論、數(shù)值模擬和模型試驗(yàn)相結(jié)合的方法,對襯砌-圍巖相互作用下的TBM斜井圍巖和襯砌力學(xué)特性的變化規(guī)律進(jìn)行系統(tǒng)研究;穿越富水地層時,需考慮地下水的滲流作用,文中對滲流影響下斜井圍巖進(jìn)行了力學(xué)分析和彈塑性理論推導(dǎo)。主要進(jìn)行了以下工作:(1)基于統(tǒng)一強(qiáng)度理論對TBM斜井圍巖進(jìn)行彈塑性理論求解結(jié)合坐標(biāo)轉(zhuǎn)換原理,建立TBM斜井橫斷面內(nèi)彈塑性力學(xué)分析模型;基于統(tǒng)一強(qiáng)度理論推導(dǎo)出兩向非等壓應(yīng)力場中圍巖塑性區(qū)半徑、圍巖應(yīng)力及位移的解析計(jì)算式。參考神華新街能源公司臺格廟礦區(qū)TBM斜井工程的實(shí)際勘察資料,進(jìn)行計(jì)算和參數(shù)分析,深入研究中間主應(yīng)力影響參數(shù)、斜井傾角、原巖側(cè)壓力系數(shù)和襯砌與圍巖彈性模量比等因素對斜井橫斷面內(nèi)圍巖塑性區(qū)半徑、彈塑性區(qū)應(yīng)力及塑性區(qū)徑向位移的影響規(guī)律。計(jì)算結(jié)果表明考慮中間主應(yīng)力作用時,圍巖自穩(wěn)能力增強(qiáng);圍巖側(cè)壓力系數(shù)、斜井傾角和襯砌與圍巖的彈性模量比均會對圍巖塑性區(qū)范圍及圍巖應(yīng)力、位移產(chǎn)生不同程度的影響;襯砌與圍巖的彈性模量比越大,襯砌支護(hù)力也越大。研究結(jié)果為類似條件下的TBM斜井施工及安全性評價提供了理論依據(jù),具有一定的工程參考意義。(2)考慮滲流影響的TBM斜井圍巖彈塑性解對TBM斜井圍巖的應(yīng)力場和滲流場進(jìn)行耦合分析,建立斜井橫斷面內(nèi)彈塑性力學(xué)分析模型;基于統(tǒng)一強(qiáng)度理論和非關(guān)聯(lián)流動法則推導(dǎo)出考慮滲流和剪脹作用的TBM斜井圍巖彈塑性解,深入研究滲流作用和剪脹角對塑性區(qū)半徑和圍巖應(yīng)力、位移的影響規(guī)律。與無滲流影響的計(jì)算結(jié)果進(jìn)行對比,結(jié)果表明地下水的滲流作用對圍巖力學(xué)特性的影響不可忽略;剪脹角對圍巖塑性區(qū)徑向位移有顯著影響,對塑性區(qū)半徑的影響相對較小,對圍巖應(yīng)力的影響不明顯。(3)TBM斜井圍巖應(yīng)力和位移變化的數(shù)值模擬計(jì)算采用FLAC3D計(jì)算軟件對不同埋深下斜井襯砌和圍巖進(jìn)行模擬計(jì)算,得到側(cè)壓系數(shù)、傾角、襯砌-圍巖彈模比和埋深對豎直斷面內(nèi)圍巖塑性區(qū)范圍、應(yīng)力和位移的變化規(guī)律。對計(jì)算模型進(jìn)行切片處理,得到斜井橫斷面的應(yīng)力、位移分布規(guī)律,并將數(shù)值計(jì)算結(jié)果與理論計(jì)算結(jié)果進(jìn)行對比分析,結(jié)果表明兩者所得結(jié)論高度一致。(4)斜井圍巖位移和襯砌內(nèi)力變化的模型試驗(yàn)研究以頂部逐級加載的方式來模擬斜井埋深的變化,通過大型室內(nèi)相似模型試驗(yàn),對不同荷載條件下襯砌管片內(nèi)力和圍巖徑向位移的變化進(jìn)行研究,得到斜井圍巖徑向位移、管片結(jié)構(gòu)不同位置處內(nèi)力隨著豎向加載值的變化規(guī)律。采用不同材料制作襯砌管片結(jié)構(gòu)進(jìn)行模型試驗(yàn),得到不同材料管片結(jié)構(gòu)對圍巖位移的影響及其自身內(nèi)力的變化情況;將試驗(yàn)結(jié)果與文中的理論計(jì)算結(jié)果進(jìn)行對比分析和驗(yàn)證。結(jié)果顯示,隨著豎向荷載值的增大,圍巖徑向位移逐漸增大,且豎直方向圍巖的位移明顯大于水平方向圍巖的位移;管片軸力和彎矩同樣隨著荷載的增大而增大。管片中各處軸力均為壓應(yīng)力,且拱腰處軸力最大,而頂部軸力最小;管片頂部和底部為正彎矩,拱腰處為負(fù)彎矩。將數(shù)值計(jì)算所得襯砌內(nèi)力值與試驗(yàn)測得結(jié)果進(jìn)行對比,二者所得結(jié)論一致。通過分析不同位置處管片內(nèi)力值,發(fā)現(xiàn)管片接頭位置對其內(nèi)力的影響不顯著。實(shí)際工程中應(yīng)根據(jù)斜井埋深的不斷變化,適當(dāng)調(diào)整管片結(jié)構(gòu)的設(shè)計(jì)強(qiáng)度和剛度,以滿足工程需要。
[Abstract]:In recent years, with the development of coal mining technology, the depth of mine mining is increasing, the productivity of the coal mine is increasing, and the problems encountered in the mining process are increasing gradually. The slope opening gradually becomes the main way to raise the productivity of the mine, and the TBM construction has gradually become an important means of the construction of the inclined shaft with its advantages of high efficiency, high quality and safety. The construction of long distance and deep buried TBM inclined shaft is a big challenge in China's coal construction. There will be many unpredictable problems in the construction process. It is of great significance to study the stability of the surrounding rock after the long distance inclined shaft excavation, but the existing related research is less. This paper is a problem to be solved at present. This paper is aimed at TBM oblique. In the construction of well, large slope, large burial depth, cross complex stratum and so on, based on the TBM slope project of the Tai GG Temple mining area, Huaxin energy company, Shen Huaxin energy company, with the method of combining the theory, numerical simulation and model test, the change law of the mechanical characteristics of the perinas and lining of the TBM inclined shaft under the interaction of lining and surrounding rock is systematically studied. When crossing the rich water stratum, the seepage action of groundwater should be considered. In this paper, the mechanical analysis and elastoplastic theory of the surrounding rock of the inclined well under the influence of seepage are carried out. The following work is done mainly: (1) based on the unified strength theory, the elastoplastic theory of the surrounding rock of the TBM inclined well is solved with the principle of coordinate transformation, and the elastic-plastic in the cross section of the TBM inclined shaft is established. Based on the unified strength theory, the analytical formula of the plastic zone radius of the surrounding rock and the stress and displacement of the surrounding rock in the two non isobaric stress field is derived. The actual survey data of the TBM slope engineering of the Shenhua New Street energy company Tai Ge Temple mining area is calculated and analyzed, and the influence parameters of the intermediate principal stress are deeply studied, and the inclined well is studied. The influence of the angle, the pressure coefficient of the original rock side and the ratio of the elastic modulus of the lining and the surrounding rock to the plastic zone radius of the surrounding rock, the stress of the elastic plastic zone and the radial displacement of the plastic zone in the cross section of the inclined shaft. The results show that the stability of the surrounding rock is enhanced when the intermediate principal stress is taken into consideration, the side pressure coefficient of the surrounding rock, the inclination of the inclined shaft and the lining and the surrounding rock The elastic modulus ratio will affect the plastic zone range of surrounding rock and the stress and displacement of surrounding rock, and the greater the modulus of elastic modulus of the lining and the surrounding rock, the greater the lining support force. The research results provide a theoretical basis for the construction and safety evaluation of TBM inclined well under similar conditions, which has certain engineering reference significance. (2) consideration of seepage. The Elastoplastic Solution of the surrounding rock of the TBM inclined well is coupled to the stress field and the seepage field of the surrounding rock of the TBM inclined shaft, and the elastoplastic mechanical analysis model in the cross section of the inclined shaft is established. Based on the unified strength theory and the unrelated flow rule, the Elastoplastic Solution of the perinas in the TBM inclined well considering the seepage and dilatancy effects is derived, and the seepage action and shear are deeply studied. The influence of the expansion angle on the plastic zone radius and the stress and displacement of the surrounding rock is compared with the calculation results without seepage. The results show that the influence of seepage on the mechanical properties of the surrounding rock can not be ignored; the dilatancy angle has a significant influence on the radial displacement of the plastic zone of the surrounding rock, and the effect on the radius of the plastic zone is relatively small, and the stress on the surrounding rock The influence is not obvious. (3) the numerical simulation calculation of the stress and displacement of the surrounding rock of TBM inclined shaft is calculated by FLAC3D software to simulate the lining and surrounding rock of the inclined shaft under different buried depth, and the change law of the lateral pressure coefficient, the dip angle, the elastic modulus ratio of the lining wall rock and the depth to the plastic zone range of the surrounding rock in the vertical section, the stress and displacement of the surrounding rock are calculated. The model is sliced to get the stress and displacement distribution of the cross section of the inclined shaft, and the results of numerical calculation are compared with the theoretical calculation results. The results show that the results are highly consistent. (4) the model test of the change of the displacement of the surrounding rock and the internal force of the lining of the inclined well is used to simulate the buried depth of the inclined shaft by the way of the top step by step. The changes in the internal force of lining tube and the radial displacement of the surrounding rock under different load conditions are studied by a large indoor similar model test. The radial displacement of the surrounding rock of the inclined shaft and the variation law of the internal force with the vertical loading value at different position of the pipe structure are obtained. The influence of the structure of different materials on the displacement of surrounding rock and the change of its internal force, the experimental results are compared with the theoretical calculation results in the paper. The results show that the radial displacement of the surrounding rock increases with the increase of the vertical load value, and the displacement of the vertical surrounding rock is obviously larger than the displacement of the surrounding rock. The axial force and bending moment of the pipe also increase with the increase of the load. The axial force in each section of the pipe is all pressure stress, and the axial force of the arch waist is the largest, and the top axis force is the least; the top and bottom of the tube are positive bending moment, and the arch waist is negative bending moment. The results of the inner force of the lining of the numerical calculation are compared with the test results, the conclusions of the two are in the same conclusion. Through the analysis of the internal force values at different positions at different positions, it is found that the effect of the position of the joint on the internal force is not significant. In practical engineering, the design strength and stiffness should be adjusted according to the constant change of the buried depth of the inclined shaft, so as to meet the needs of the engineering.

【學(xué)位授予單位】：中國礦業(yè)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TD26

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