斜井凍結(jié)井壁內(nèi)壁計算方法研究及設(shè)計軟件包開發(fā)
發(fā)布時間：2018-08-14 11:15
【摘要】：為滿足我國西部含水地層中斜井凍結(jié)法鑿井的需要,本文開展了含水地層中斜井雙層復(fù)合凍結(jié)井壁內(nèi)壁力學(xué)特性研究,提出了含水地層中斜井雙層復(fù)合凍結(jié)井壁內(nèi)壁設(shè)計方法,基于數(shù)值計算結(jié)果和近似求解方法開發(fā)了FSL_CAD軟件包(FSL_CAD:Computer Aided Design of Freezing Inclined Shaft Lining)。首先,建立了井壁四圓弧通用等厚力學(xué)模型,然后根據(jù)永久使用階段凍結(jié)斜井內(nèi)壁受力特點,建立了不考慮與考慮圍巖限制作用的斜井井壁計算模型,獲得了井壁幾何參數(shù)組合與井壁彈性力學(xué)特性的關(guān)系。數(shù)值計算研究表明:考慮圍巖限制作用改變了井壁變形模式和應(yīng)力值,但不改變拉壓狀態(tài);井壁幾何參數(shù)與應(yīng)力存在以下關(guān)系:井壁仰拱環(huán)向應(yīng)力與仰拱半徑成二次函數(shù)關(guān)系,井壁頂拱環(huán)向應(yīng)力與頂拱半徑成線性關(guān)系,井壁各點環(huán)向應(yīng)力與井壁厚度成三次函數(shù)關(guān)系。其次,提出了仰拱增厚模型,獲得了不考慮圍巖與考慮圍巖條件下井壁彈性力學(xué)特性關(guān)系,研究表明:不考慮圍巖限制作用模型下,仰拱增厚模型可以有效降低井壁的向內(nèi)變形量,仰拱段變形減小量均達到60%,同時可降低井壁各點環(huán)向應(yīng)力;考慮圍巖限制作用模型下,仰拱增厚模型主要對仰拱部分起作用,頂拱和側(cè)墻段徑向位移和環(huán)向應(yīng)力與等厚模型相比幾乎無變化,仰拱增厚僅僅降低了仰拱段的徑向變形量和環(huán)向應(yīng)力值,仰拱段環(huán)向應(yīng)力變化更加平緩,建議施工時填平仰拱內(nèi)緣。第三,進行了通用模型近似解法研究,獲得了以結(jié)構(gòu)力學(xué)力法和以溫克爾地基梁理論為基礎(chǔ)的框架模型解法和曲梁模型解法,并提出了三種仰拱不等厚模型。研究表明:框架模型近似解法可在井壁厚度與井壁凈跨比不大于0.14時進行不考慮圍巖模型的計算,超出范圍時需對模型進行荷載修正或軸線修正;曲梁模型計算考慮了圍巖的影響,通過多次迭代達到與實際更貼切的結(jié)論;三種不等厚模型的分析表明,仰拱不等厚模型C為最佳模型,建議工程實際中采用。最后,以數(shù)值計算和近似解法為基礎(chǔ),開發(fā)了FSL_CAD軟件包,并總結(jié)了斜井雙層復(fù)合凍結(jié)井壁內(nèi)壁設(shè)計方法,提出斜井雙層復(fù)合凍結(jié)井壁結(jié)構(gòu)宜選用帶仰拱的結(jié)構(gòu),且仰拱半徑盡可能的小。采用FSL_CAD軟件進行了實例試算,計算過程較為方便。綜合全文研究表明,仰拱對于井壁整體的受力和變位影響很大,合理設(shè)計仰拱可有效的降低井壁模型的內(nèi)力,減小井壁模型的厚度。斜井井壁設(shè)計時設(shè)計荷載取全水壓,斷面取帶仰拱結(jié)構(gòu),按控制點應(yīng)力小于混凝土綜合強度進行設(shè)計。
[Abstract]:In order to meet the need of freezing inclined shaft in western water bearing formation of west China, this paper studies the mechanical characteristics of double layer composite freezing shaft lining in water cut formation, and puts forward the design method of double layer composite freezing shaft lining in water cut formation. FSL_CAD software package (FSL_CAD:Computer Aided Design of Freezing Inclined Shaft Lining).) is developed based on numerical results and approximate solution method. First of all, the universal equal thickness mechanical model of four circular arcs of shaft lining is established, and then according to the characteristics of internal wall force of frozen inclined shaft in permanent use stage, the calculation model of inclined shaft wall is established without considering and considering the influence of surrounding rock restriction. The relationship between the combination of geometric parameters and the elastic properties of the shaft wall is obtained. The numerical calculation results show that the deformation mode and stress value of shaft wall are changed by considering the limitation of surrounding rock, but the state of tension and compression is not changed, and the geometric parameters of shaft wall have the following relationship with stress: the relationship between circumferential stress and radius of inverted arch of shaft wall is a quadratic function. There is a linear relationship between the circumferential stress of the top arch and the radius of the top arch, and the relationship between the circumferential stress at every point of the shaft wall and the thickness of the shaft wall is cubic. Secondly, an inverted arch thickening model is proposed, and the relationship between wall rock and wall elastic properties is obtained. The results show that the model does not consider the constraint of surrounding rock. The inverted arch thickening model can effectively reduce the inward deformation of the shaft wall, and the deformation of the inverted arch section can be reduced to 60 percent, and at the same time, the circumferential stress at all points of the shaft wall can be reduced. Considering the wall rock restriction model, the inverted arch thickening model mainly works on the inverted arch. The radial displacement and circumferential stress of the top arch and the lateral wall are almost unchanged compared with the equal thickness model. The thickness increase of the inverted arch only reduces the radial deformation and the circumferential stress of the inverted arch, and the change of the circumferential stress in the inverted arch is more gentle. It is suggested that the inner edge of the inverted arch be filled in during construction. Thirdly, the approximate solution of general model is studied, the frame model solution and curved beam model solution based on structural mechanics force method and Winkler foundation beam theory are obtained, and three kinds of inverted arch unequal thickness models are proposed. The results show that the approximate method of frame model can calculate the wall rock model without considering the wall rock model when the ratio of wall thickness to net span is less than 0.14, and the model should be modified by load or axis when it is beyond the range. The calculation of curved beam model takes into account the influence of surrounding rock and reaches the conclusion that it is more appropriate to practice through multiple iterations. The analysis of three unequal thickness models shows that model C of inverted arch is the best model and is recommended to be used in engineering practice. Finally, on the basis of numerical calculation and approximate solution, FSL_CAD software package is developed, and the design method of double-layer composite frozen shaft lining is summarized. The radius of the inverted arch is as small as possible. The FSL_CAD software is used to carry on the example trial calculation, the calculation process is more convenient. The comprehensive research shows that the inverted arch has a great influence on the stress and displacement of the whole shaft wall. The reasonable design of the inverted arch can effectively reduce the internal force of the shaft wall model and reduce the thickness of the shaft wall model. In the design of inclined shaft wall, the total water pressure is taken as the design load and the inverted arch structure is taken as the cross section, and the design is carried out according to the stress of the control point less than the comprehensive strength of concrete.
【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】：TD262.12
本文編號：2182676
[Abstract]:In order to meet the need of freezing inclined shaft in western water bearing formation of west China, this paper studies the mechanical characteristics of double layer composite freezing shaft lining in water cut formation, and puts forward the design method of double layer composite freezing shaft lining in water cut formation. FSL_CAD software package (FSL_CAD:Computer Aided Design of Freezing Inclined Shaft Lining).) is developed based on numerical results and approximate solution method. First of all, the universal equal thickness mechanical model of four circular arcs of shaft lining is established, and then according to the characteristics of internal wall force of frozen inclined shaft in permanent use stage, the calculation model of inclined shaft wall is established without considering and considering the influence of surrounding rock restriction. The relationship between the combination of geometric parameters and the elastic properties of the shaft wall is obtained. The numerical calculation results show that the deformation mode and stress value of shaft wall are changed by considering the limitation of surrounding rock, but the state of tension and compression is not changed, and the geometric parameters of shaft wall have the following relationship with stress: the relationship between circumferential stress and radius of inverted arch of shaft wall is a quadratic function. There is a linear relationship between the circumferential stress of the top arch and the radius of the top arch, and the relationship between the circumferential stress at every point of the shaft wall and the thickness of the shaft wall is cubic. Secondly, an inverted arch thickening model is proposed, and the relationship between wall rock and wall elastic properties is obtained. The results show that the model does not consider the constraint of surrounding rock. The inverted arch thickening model can effectively reduce the inward deformation of the shaft wall, and the deformation of the inverted arch section can be reduced to 60 percent, and at the same time, the circumferential stress at all points of the shaft wall can be reduced. Considering the wall rock restriction model, the inverted arch thickening model mainly works on the inverted arch. The radial displacement and circumferential stress of the top arch and the lateral wall are almost unchanged compared with the equal thickness model. The thickness increase of the inverted arch only reduces the radial deformation and the circumferential stress of the inverted arch, and the change of the circumferential stress in the inverted arch is more gentle. It is suggested that the inner edge of the inverted arch be filled in during construction. Thirdly, the approximate solution of general model is studied, the frame model solution and curved beam model solution based on structural mechanics force method and Winkler foundation beam theory are obtained, and three kinds of inverted arch unequal thickness models are proposed. The results show that the approximate method of frame model can calculate the wall rock model without considering the wall rock model when the ratio of wall thickness to net span is less than 0.14, and the model should be modified by load or axis when it is beyond the range. The calculation of curved beam model takes into account the influence of surrounding rock and reaches the conclusion that it is more appropriate to practice through multiple iterations. The analysis of three unequal thickness models shows that model C of inverted arch is the best model and is recommended to be used in engineering practice. Finally, on the basis of numerical calculation and approximate solution, FSL_CAD software package is developed, and the design method of double-layer composite frozen shaft lining is summarized. The radius of the inverted arch is as small as possible. The FSL_CAD software is used to carry on the example trial calculation, the calculation process is more convenient. The comprehensive research shows that the inverted arch has a great influence on the stress and displacement of the whole shaft wall. The reasonable design of the inverted arch can effectively reduce the internal force of the shaft wall model and reduce the thickness of the shaft wall model. In the design of inclined shaft wall, the total water pressure is taken as the design load and the inverted arch structure is taken as the cross section, and the design is carried out according to the stress of the control point less than the comprehensive strength of concrete.
【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】：TD262.12
【引證文獻】
相關(guān)會議論文 前3條
1 楊維好;;十年來中國凍結(jié)法鑿井技術(shù)的發(fā)展與展望[A];中國煤炭學(xué)會成立五十周年高層學(xué)術(shù)論壇論文集[C];2012年
2 王明年;關(guān)寶樹;;隧道仰拱受力分析及設(shè)計方法的研究[A];第二屆全國青年巖石力學(xué)與工程學(xué)術(shù)研討會論文集[C];1993年
3 范廣勤;;高地應(yīng)力區(qū)巷道斷面形狀對圍巖穩(wěn)定的模型試驗[A];第18屆全國結(jié)構(gòu)工程學(xué)術(shù)會議論文集第Ⅱ冊[C];2009年
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