斜井冻结井壁内壁计算方法研究及设计软件包开发
发布时间：2018-08-14 11:15
【摘要】：为满足我国西部含水地层中斜井冻结法凿井的需要,本文开展了含水地层中斜井双层复合冻结井壁内壁力学特性研究,提出了含水地层中斜井双层复合冻结井壁内壁设计方法,基于数值计算结果和近似求解方法开发了FSL_CAD软件包(FSL_CAD:Computer Aided Design of Freezing Inclined Shaft Lining)。首先,建立了井壁四圆弧通用等厚力学模型,然后根据永久使用阶段冻结斜井内壁受力特点,建立了不考虑与考虑围岩限制作用的斜井井壁计算模型,获得了井壁几何参数组合与井壁弹性力学特性的关系。数值计算研究表明:考虑围岩限制作用改变了井壁变形模式和应力值,但不改变拉压状态;井壁几何参数与应力存在以下关系:井壁仰拱环向应力与仰拱半径成二次函数关系,井壁顶拱环向应力与顶拱半径成线性关系,井壁各点环向应力与井壁厚度成三次函数关系。其次,提出了仰拱增厚模型,获得了不考虑围岩与考虑围岩条件下井壁弹性力学特性关系,研究表明:不考虑围岩限制作用模型下,仰拱增厚模型可以有效降低井壁的向内变形量,仰拱段变形减小量均达到60%,同时可降低井壁各点环向应力;考虑围岩限制作用模型下,仰拱增厚模型主要对仰拱部分起作用,顶拱和侧墙段径向位移和环向应力与等厚模型相比几乎无变化,仰拱增厚仅仅降低了仰拱段的径向变形量和环向应力值,仰拱段环向应力变化更加平缓,建议施工时填平仰拱内缘。第三,进行了通用模型近似解法研究,获得了以结构力学力法和以温克尔地基梁理论为基础的框架模型解法和曲梁模型解法,并提出了三种仰拱不等厚模型。研究表明:框架模型近似解法可在井壁厚度与井壁净跨比不大于0.14时进行不考虑围岩模型的计算,超出范围时需对模型进行荷载修正或轴线修正;曲梁模型计算考虑了围岩的影响,通过多次迭代达到与实际更贴切的结论;三种不等厚模型的分析表明,仰拱不等厚模型C为最佳模型,建议工程实际中采用。最后,以数值计算和近似解法为基础,开发了FSL_CAD软件包,并总结了斜井双层复合冻结井壁内壁设计方法,提出斜井双层复合冻结井壁结构宜选用带仰拱的结构,且仰拱半径尽可能的小。采用FSL_CAD软件进行了实例试算,计算过程较为方便。综合全文研究表明,仰拱对于井壁整体的受力和变位影响很大,合理设计仰拱可有效的降低井壁模型的内力,减小井壁模型的厚度。斜井井壁设计时设计荷载取全水压,断面取带仰拱结构,按控制点应力小于混凝土综合强度进行设计。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD262.12
本文编号：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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD262.12
【引证文献】
相关会议论文 前3条
1 杨维好;;十年来中国冻结法凿井技术的发展与展望[A];中国煤炭学会成立五十周年高层学术论坛论文集[C];2012年
2 王明年;关宝树;;隧道仰拱受力分析及设计方法的研究[A];第二届全国青年岩石力学与工程学术研讨会论文集[C];1993年
3 范广勤;;高地应力区巷道断面形状对围岩稳定的模型试验[A];第18届全国结构工程学术会议论文集第Ⅱ册[C];2009年
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