【摘要】：目前在邊坡工程治理中,在如何正確考慮處理滲流作用對(duì)邊坡穩(wěn)定性的影響方面存在諸多問(wèn)題,本文就該問(wèn)題展開(kāi)研究工作。深入剖析了滲流作用力的特征,得到土坡穩(wěn)定分析中的一個(gè)重要法則:采用滲透力時(shí)必須與土的浮重相平衡,采用周?chē)紫端畨毫r(shí)必須與土的飽和重相平衡。在穩(wěn)定分析計(jì)算時(shí),可以把多個(gè)邊界水壓力用單一的體積力即滲透力來(lái)代替,使問(wèn)題得以簡(jiǎn)化。根據(jù)各向受力平衡分析,論證了水土分算與水土合算的等效性。以宏觀土條和微觀流網(wǎng)微單元為研究對(duì)象,應(yīng)用等勢(shì)線上測(cè)壓水頭相等的原理,確定土條和流網(wǎng)微單元邊界上孔隙水壓力分布,將水重與邊界孔隙水壓力在互相正交的兩個(gè)方向分解后再合成,得到該合力在方向、大小和作用點(diǎn)上等同于滲透力,定量論證了飽和土體受外部水壓力等效于土骨架受浮重及滲透力。在Fellenius法、簡(jiǎn)化Bishop法和Janbu法的改進(jìn)分析過(guò)程中明晰了孔隙水壓力與滲流力的區(qū)別,當(dāng)以水土混合體為研究對(duì)象時(shí)考慮土體周?chē)紫端畨毫?以土骨架為研究對(duì)象時(shí)考慮滲流力,避免重復(fù)考慮滲流力的作用,正確處理了邊界力與體積力的關(guān)系。正確匹配了水土作用力,用孔隙水壓力時(shí)必須與土的飽和重相平衡,用滲流力時(shí)必須與土體浮重相平衡。在考慮土條側(cè)面受到的水壓力時(shí),按照流線與等勢(shì)線相互垂直的流網(wǎng)性質(zhì)去確定條塊浸潤(rùn)線以下側(cè)面水壓力分布和底面水壓力分布。揭示了在極限平衡條分法中滲流作用對(duì)土條的作用機(jī)理,在改進(jìn)分析過(guò)程中,根據(jù)嚴(yán)格的數(shù)學(xué)推導(dǎo)證明了滲流作用下以水土混合體為研究對(duì)象和以土骨架為研究對(duì)象兩種分析方法在本質(zhì)上是一致的。針對(duì)本文提出的滲流作用下的經(jīng)典土坡方法編制了相應(yīng)的Fortran語(yǔ)言計(jì)算程序,選擇經(jīng)典算例進(jìn)行了分析驗(yàn)證,對(duì)其他已有的滲流作用簡(jiǎn)化考慮方法進(jìn)行了剖析,分析指出這些方法的不足或者錯(cuò)誤之處,對(duì)比分析結(jié)果再次論證了本文理論方法的正確性和有效性。
[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.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU43

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