本文選題：TBM工法　切入點(diǎn)：煤礦斜井　出處：《北京交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：TBM工法已經(jīng)廣泛應(yīng)用于國內(nèi)外各個(gè)領(lǐng)域的隧道建設(shè)中,技術(shù)理論成熟,施工經(jīng)驗(yàn)豐富。但是,以TBM工法為基礎(chǔ)建立的主、副運(yùn)輸斜井應(yīng)用于煤礦領(lǐng)域,在國內(nèi)尚屬首次。本文依托內(nèi)蒙古新街礦區(qū)(一井)斜井結(jié)構(gòu),研究TBM工法應(yīng)用于煤礦建設(shè)領(lǐng)域的技術(shù)問題。 新街礦區(qū)煤田由于工程所處地質(zhì)情況復(fù)雜,其穿過某含水層厚度平均達(dá)到327.56m,且含水層透水性良好,故此斜井采用TBM(隧道掘進(jìn)機(jī))法開挖和管片拼裝結(jié)構(gòu)支護(hù),斜井斜長6558m、傾角6。、厚度350mm,落底于3-1可采煤層的底板,與煤田中部的大巷連接。 為了最大限度地進(jìn)行煤層開采并控制對斜井結(jié)構(gòu)的不利影響,需要估算合理的斜井保護(hù)煤柱尺寸。經(jīng)驗(yàn)公式法只籠統(tǒng)地涉及煤層的幾何參數(shù)和力學(xué)性質(zhì),而數(shù)值模擬則可以同時(shí)考慮煤層、巖層、斜井結(jié)構(gòu)的幾何特征和力學(xué)特征。本文針對地層-斜井的相對位置關(guān)系,采用以有限差分法為基本思想的FLAC3D軟件計(jì)算分析。主要研究工作和取得的成果如下： 1.以二維固體力學(xué)模型為基礎(chǔ),在模型幾何關(guān)系不變的情況下,保護(hù)煤柱寬度變化對管片影響最大,其次為巖層彈性模量變化,巖層粘聚力和摩擦角變化影響很��；而在其他參數(shù)不變的情況下,斜井底板距煤層越高,對管片的影響越小。 以改變保護(hù)煤柱彈性模量大小和加固范圍作為預(yù)加固措施,隨著模量大小和加固范圍的提高,斜井管片的軸力、彎矩均顯著減小。 2.以三維固體力學(xué)模型為基礎(chǔ),隨著保護(hù)煤柱寬度增加,管片所受的最大軸力、彎矩遞減,但保護(hù)煤柱寬度增大到一定程度后,軸力、彎矩值將會穩(wěn)定在一個(gè)范圍內(nèi)。 巖石移動角變化對管片受力影響很小,對管片位移影響較大,隨著巖石移動角增大,管片最大位移值呈先緩慢增大,后快速增大。 3.考慮地下水作用的流固耦合模型表明,滲流作用對管片的受力和位移更為不利；且地下水滲流時(shí)間越長對管片的位移影響越大,因此在實(shí)際工程中需要控制地下水的滲流影響。 4.根據(jù)“等效軸向剛度模型”理論公式及新街煤礦的實(shí)際參數(shù),計(jì)算得到了管片縱向連接螺栓的彈性、塑性及破壞狀態(tài)的臨界曲率半徑。根據(jù)FLAC3D計(jì)算結(jié)果,單純的煤層開采對斜井縱向不均勻位移影響較��；但斜井周圍發(fā)生局部滲流時(shí),則會顯著降低位移曲線的曲率半徑,使斜井縱向螺栓達(dá)到塑性工作狀態(tài)。
[Abstract]:TBM method has been widely used in tunnel construction in various fields at home and abroad. The technical theory is mature and the construction experience is rich. However, the main and secondary transportation inclined wells based on TBM method are applied to the coal mine field. It is the first time in China. Based on the inclined well structure of Xinjie mining area in Inner Mongolia, this paper studies the technical problems of the application of TBM method in the field of coal mine construction. Due to the complex geological conditions of the coal field in Xinjie mining area, the thickness of the coal field passing through an aquifer is 327.56 m on average, and the aquifer permeability is good. Therefore, the inclined shaft is excavated by TBM method and supported by the segment assembly structure. The inclined shaft is 6558 m long, with a dip angle of 6.50 mm and a thickness of 350 mm. It falls to the floor of the 3-1 minable coal seam and is connected with the roadway in the middle of the coal field. In order to maximize the coal seam mining and control the adverse effects on the inclined shaft structure, it is necessary to estimate the reasonable size of the inclined shaft protection pillar. The empirical formula method only deals with the geometric parameters and mechanical properties of the coal seam in general. The geometric and mechanical characteristics of coal seam, rock formation and inclined well structure can be taken into account in numerical simulation. The calculation and analysis of FLAC3D software based on the finite difference method are adopted. The main research work and the results obtained are as follows:. 1. Based on the two-dimensional solid mechanics model, under the condition that the geometric relation of the model is invariant, the change of the width of the protection coal pillar has the greatest influence on the segment, the next is the change of the elastic modulus of the rock layer, and the change of the cohesive force and the friction angle of the rock layer is very small. However, the higher the floor spacing of inclined well, the smaller the influence on the pipe segment when other parameters are not changed. With the change of elastic modulus and reinforcement range of coal pillar as pre-reinforcement measures, the axial force and bending moment of inclined shaft pipe are significantly decreased with the increase of modulus and reinforcement range. 2. Based on the three-dimensional solid mechanics model, the maximum axial force and bending moment of the segment decrease with the increase of the width of the protecting coal pillar, but when the width of the protected coal pillar increases to a certain extent, the axial force and bending moment value will be stabilized in a certain range. The change of rock moving angle has little effect on the stress of the segment and a great influence on the segment displacement. With the increase of the rock moving angle, the maximum displacement value of the segment increases slowly at first and then increases rapidly. 3. The fluid-solid coupling model considering the effect of groundwater shows that the seepage action is more unfavorable to the stress and displacement of the segment, and the longer the groundwater seepage time, the greater the influence on the displacement of the segment. Therefore, it is necessary to control the influence of groundwater seepage in practical engineering. 4.According to the theoretical formula of "equivalent axial stiffness model" and the actual parameters of Xinjie Coal Mine, the elastic, plastic and critical curvature radius of segment longitudinal connection bolt is calculated. According to the FLAC3D calculation results, Simple coal seam mining has little effect on longitudinal uneven displacement of inclined well, but when local seepage occurs around inclined well, the curvature radius of displacement curve will be significantly reduced, and the longitudinal bolt of inclined shaft will reach the plastic working state.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD82;TD32

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 謝廣祥;楊科;常聚才;;煤柱寬度對綜放面圍巖應(yīng)力分布規(guī)律影響[J];北京科技大學(xué)學(xué)報(bào);2006年11期

2 吳立新,王金莊;煤柱寬度的計(jì)算公式及其影響因素分析[J];礦山測量;1997年01期

3 宋選民,竇江海;淺埋煤層回采巷道合理煤柱寬度的實(shí)測研究[J];礦山壓力與頂板管理;2003年03期

4 李洪,耿獻(xiàn)文,朱學(xué)軍;區(qū)段煤柱寬度的實(shí)測確定[J];礦山壓力與頂板管理;2005年01期

5 鄒友峰;柴華彬;;我國條帶煤柱穩(wěn)定性研究現(xiàn)狀及存在問題[J];采礦與安全工程學(xué)報(bào);2006年02期

6 白國良;;基于FLAC~(3D)的采動巖體等效連續(xù)介質(zhì)流固耦合模型及應(yīng)用[J];采礦與安全工程學(xué)報(bào);2010年01期

7 梁興旺;王連國;何興華;李智;;沿空掘巷窄煤柱合理寬度的確定[J];礦業(yè)研究與開發(fā);2007年02期

8 王永秀,齊慶新,徐剛,徐方軍,張修鋒;華豐礦保護(hù)層開采數(shù)值模擬研究[J];煤礦開采;2003年04期

9 張敏,王樹全;“三軟”較薄厚煤層窄煤柱護(hù)巷的應(yīng)用效果分析[J];煤礦開采;2005年01期

10 朱劉娟;陳俊杰;鄒友峰;;深部開采條件下巖層移動角確定研究[J];煤炭工程;2006年02期

，

本文編號：1625789