考虑渗流作用的经典土坡稳定分析方法
发布时间：2018-08-08 12:03
【摘要】：目前在边坡工程治理中,在如何正确考虑处理渗流作用对边坡稳定性的影响方面存在诸多问题,本文就该问题展开研究工作。深入剖析了渗流作用力的特征,得到土坡稳定分析中的一个重要法则:采用渗透力时必须与土的浮重相平衡,采用周围孔隙水压力时必须与土的饱和重相平衡。在稳定分析计算时,可以把多个边界水压力用单一的体积力即渗透力来代替,使问题得以简化。根据各向受力平衡分析,论证了水土分算与水土合算的等效性。以宏观土条和微观流网微单元为研究对象,应用等势线上测压水头相等的原理,确定土条和流网微单元边界上孔隙水压力分布,将水重与边界孔隙水压力在互相正交的两个方向分解后再合成,得到该合力在方向、大小和作用点上等同于渗透力,定量论证了饱和土体受外部水压力等效于土骨架受浮重及渗透力。在Fellenius法、简化Bishop法和Janbu法的改进分析过程中明晰了孔隙水压力与渗流力的区别,当以水土混合体为研究对象时考虑土体周围孔隙水压力,以土骨架为研究对象时考虑渗流力,避免重复考虑渗流力的作用,正确处理了边界力与体积力的关系。正确匹配了水土作用力,用孔隙水压力时必须与土的饱和重相平衡,用渗流力时必须与土体浮重相平衡。在考虑土条侧面受到的水压力时,按照流线与等势线相互垂直的流网性质去确定条块浸润线以下侧面水压力分布和底面水压力分布。揭示了在极限平衡条分法中渗流作用对土条的作用机理,在改进分析过程中,根据严格的数学推导证明了渗流作用下以水土混合体为研究对象和以土骨架为研究对象两种分析方法在本质上是一致的。针对本文提出的渗流作用下的经典土坡方法编制了相应的Fortran语言计算程序,选择经典算例进行了分析验证,对其他已有的渗流作用简化考虑方法进行了剖析,分析指出这些方法的不足或者错误之处,对比分析结果再次论证了本文理论方法的正确性和有效性。
[Abstract]:At present, there are many problems in how to deal with the influence of seepage on slope stability in slope engineering treatment. In this paper, the characteristics of seepage force are deeply analyzed, and an important rule in the stability analysis of soil slope is obtained: when the seepage force is adopted, the floating weight phase of the soil must be balanced, and when the pore water pressure around the soil is adopted, the saturated heavy phase of the soil must be balanced. In the stability analysis and calculation, the multiple boundary water pressure can be replaced by a single volume force, that is, the permeability force, so that the problem can be simplified. According to the analysis of stress balance in each direction, the equivalence between soil and water distribution and soil and water is proved. The pore water pressure distribution on the boundary of soil strip and micro drift-net unit is determined by using the principle of equal pressure head on the isopotential line. After decomposing the water weight and the boundary pore water pressure in two orthogonal directions, the resultant force is equal to the permeability force in the direction, size and operation point. It is proved quantitatively that the saturated soil subjected to external water pressure is equivalent to the floating weight and permeability of the soil skeleton. In the improved analysis of Fellenius method, simplified Bishop method and Janbu method, the difference between pore water pressure and seepage force is clarified. When the soil and water mixture is taken as the object of study, the pore water pressure around the soil is considered, and the seepage force is considered when the soil skeleton is taken as the object of study. The relationship between boundary force and volume force is correctly dealt with by avoiding repeated consideration of the effect of seepage force. When the pore water pressure is used, it must be balanced with the saturated rephase of the soil and the floating phase with the seepage force. Considering the water pressure on the side of the soil strip, the water pressure distribution and the bottom water pressure distribution under the strip infiltration line are determined according to the characteristics of the streamlines and isopotential lines perpendicular to each other. The mechanism of seepage acting on soil strip in the limit equilibrium strip method is revealed. In the process of improving the analysis, According to the strict mathematical derivation, it is proved that the two analytical methods of soil and water mixture and soil skeleton under seepage action are consistent in nature. According to the classical soil slope method proposed in this paper, the corresponding Fortran language calculation program is compiled, and the classical examples are selected for analysis and verification, and the other existing simplified methods for considering seepage action are analyzed. The shortcomings or errors of these methods are pointed out, and the validity and validity of the theoretical methods in this paper are demonstrated again by the comparative analysis results.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU43
本文编号：2171731
[Abstract]:At present, there are many problems in how to deal with the influence of seepage on slope stability in slope engineering treatment. In this paper, the characteristics of seepage force are deeply analyzed, and an important rule in the stability analysis of soil slope is obtained: when the seepage force is adopted, the floating weight phase of the soil must be balanced, and when the pore water pressure around the soil is adopted, the saturated heavy phase of the soil must be balanced. In the stability analysis and calculation, the multiple boundary water pressure can be replaced by a single volume force, that is, the permeability force, so that the problem can be simplified. According to the analysis of stress balance in each direction, the equivalence between soil and water distribution and soil and water is proved. The pore water pressure distribution on the boundary of soil strip and micro drift-net unit is determined by using the principle of equal pressure head on the isopotential line. After decomposing the water weight and the boundary pore water pressure in two orthogonal directions, the resultant force is equal to the permeability force in the direction, size and operation point. It is proved quantitatively that the saturated soil subjected to external water pressure is equivalent to the floating weight and permeability of the soil skeleton. In the improved analysis of Fellenius method, simplified Bishop method and Janbu method, the difference between pore water pressure and seepage force is clarified. When the soil and water mixture is taken as the object of study, the pore water pressure around the soil is considered, and the seepage force is considered when the soil skeleton is taken as the object of study. The relationship between boundary force and volume force is correctly dealt with by avoiding repeated consideration of the effect of seepage force. When the pore water pressure is used, it must be balanced with the saturated rephase of the soil and the floating phase with the seepage force. Considering the water pressure on the side of the soil strip, the water pressure distribution and the bottom water pressure distribution under the strip infiltration line are determined according to the characteristics of the streamlines and isopotential lines perpendicular to each other. The mechanism of seepage acting on soil strip in the limit equilibrium strip method is revealed. In the process of improving the analysis, According to the strict mathematical derivation, it is proved that the two analytical methods of soil and water mixture and soil skeleton under seepage action are consistent in nature. According to the classical soil slope method proposed in this paper, the corresponding Fortran language calculation program is compiled, and the classical examples are selected for analysis and verification, and the other existing simplified methods for considering seepage action are analyzed. The shortcomings or errors of these methods are pointed out, and the validity and validity of the theoretical methods in this paper are demonstrated again by the comparative analysis results.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU43
【参考文献】
相关期刊论文 前10条
1 毛昶熙;段祥宝;;关于渗流的力及其应用[J];岩土力学;2009年06期
2 朱大勇;邓建辉;台佳佳;;简化Bishop法严格性的论证[J];岩石力学与工程学报;2007年03期
3 顾宝和;毛尚之;;滑坡稳定分析传递系数法的讨论[J];工程勘察;2006年12期
4 朱大勇,李焯芬,黄茂松,钱七虎;对3种著名边坡稳定性计算方法的改进[J];岩石力学与工程学报;2005年02期
5 朱大勇,李焯芬,姜弘道,康景文;基于滑面正应力修正的边坡安全系数解答[J];岩石力学与工程学报;2004年16期
6 郑颖人,杨明成;边坡稳定安全系数求解格式的分类统一[J];岩石力学与工程学报;2004年16期
7 张鲁渝,郑颖人;扩展简化Bishop法的取矩中心对安全系数的影响[J];岩土力学;2004年08期
8 陈立宏,李广信;关于“渗流作用下土坡圆弧滑动有限元计算”的讨论之二——兼论边坡稳定分析中的渗流力[J];岩土工程学报;2002年03期
9 毛昶熙,李吉庆,段祥宝;渗流作用下土坡圆弧滑动有限元计算[J];岩土工程学报;2001年06期
10 黄春娥,龚晓南,顾晓鲁;考虑渗流的基坑边坡稳定分析[J];土木工程学报;2001年04期
相关博士学位论文 前1条
1 黄春娥;考虑渗流作用的基坑稳定分析[D];浙江大学;2001年
相关硕士学位论文 前1条
1 赵成;Janbu法收敛性的讨论及通用极限平衡法的实现[D];长安大学;2008年
，本文编号：2171731
本文链接：https://www.wllwen.com/guanlilunwen/chengjian/2171731.html
