本文關(guān)鍵詞：基于狀態(tài)相關(guān)性的土體滲透變形特性試驗研究　出處：《長沙理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 滲透變形 滲透儀 復(fù)雜應(yīng)力 臨界水力坡降 室內(nèi)試驗

【摘要】：土體滲透變形問題是工程建設(shè)中常見、不可忽視的安全問題。研究表明：土體的顆粒組成特性和土體周圍的應(yīng)力狀態(tài)對土體的滲透變形特性影響較大。在考慮土體的顆粒組成特性和應(yīng)力狀態(tài)的情況下，如何確立一種有效的方法，研究土體的滲透變形機(jī)理以及關(guān)鍵水力學(xué)參數(shù)取值，對采取積極有效的滲控工程處置措施具有十分重要的理論意義和工程實用價值。本文通過總結(jié)前人研究成果，采取室內(nèi)實驗的方法，對土體的滲透變特性進(jìn)行了深入研究，得到了應(yīng)力狀態(tài)下土體的滲透變形型式、滲透性變化過程、抗?jié)B強(qiáng)度。主要研究成果如下： （1）對已有的土體滲透變形理論研究發(fā)現(xiàn)，而且每種理論均有一定的局限性，對于臨界水力坡降的計算，已有的理論更是極少有考慮土體所受應(yīng)力狀態(tài)，對此，提出一種應(yīng)力狀態(tài)下土體臨界水力坡降的計算方法。 （2）關(guān)于土體的滲透變形實驗，特別是應(yīng)力狀態(tài)下的土體滲透變形實驗，國內(nèi)沒有統(tǒng)一的試驗儀器。因此，研制加載式滲透儀，對其中的雙杠桿加載裝置的工作原理、制作過程、設(shè)計特點等做了詳細(xì)闡述。結(jié)合研制的加載式滲透儀，提出相應(yīng)的試驗方法。經(jīng)過試驗使用后，效果很好，能夠給土體提供不同的應(yīng)力狀態(tài)，而且試驗所得結(jié)果也表明，更符合工程實際。 （3）土體滲透變形型式受細(xì)顆粒含量、粘粒的含量、應(yīng)力狀態(tài)等因素影響。不含粘粒的試樣的破壞型式都為管涌，而含粘粒的試樣，粘粒的含量低時，試樣滲透變形為管涌。粘粒含量高時，試樣滲透變形為水力劈裂。應(yīng)力狀態(tài)越高，試樣破壞時的滲透變形現(xiàn)象越不劇烈。 （4）細(xì)顆粒含量、粘粒含量、應(yīng)力狀態(tài)等因素對土體滲透性變化過程有著較大影響。不含粘�；蛘哒沉：枯^少時，試樣的滲透性一般是先降低，后升高。當(dāng)粘粒含量較多時，無附加應(yīng)力狀態(tài)下，試樣的滲透性在破壞前基本沒有變化，破壞后會突然增大，且水力坡降減小，在應(yīng)力狀態(tài)下，試樣的滲透性在破壞前基本沒有變化，破壞后滲透性突然增大，，水力坡降卻增大。 （5）影響土體抗?jié)B強(qiáng)度的因素很多,細(xì)顆粒含量、粘粒的含量、應(yīng)力狀態(tài)是其中最重要的幾個因素。細(xì)顆粒的含量和粘粒含量越高，土體的抗?jié)B強(qiáng)度越高；應(yīng)力越大，土體的抗?jié)B強(qiáng)度越高。
[Abstract]:Soil seepage deformation is a common problem in engineering construction. Safety issues that cannot be ignored. Studies have shown that:. The particle composition characteristics and the stress state around the soil have a great influence on the seepage deformation characteristics of the soil, considering the particle composition characteristics and the stress state of the soil. How to establish an effective method to study the mechanism of soil seepage deformation and the value of key hydraulic parameters. It is of great theoretical significance and practical value to take active and effective disposal measures of seepage control engineering. This paper summarizes the previous research results and adopts the method of laboratory experiment. The seepage deformation pattern, permeability change process and impermeability strength of soil under stress state are obtained. The main research results are as follows: It is found that each theory has some limitations. For the calculation of critical hydraulic slope, the existing theories seldom consider the stress state of soil. A method for calculating the critical hydraulic gradient of soil under stress state is presented. 2) there is no uniform test instrument for the soil seepage deformation experiment, especially under the stress state. Therefore, the loaded osmometer is developed. The working principle, manufacturing process and design features of the double lever loading device are described in detail. Combined with the developed loading osmometer, the corresponding test method is put forward. It can provide different stress states to the soil, and the experimental results also show that it is more in line with the engineering practice. (3) the seepage deformation pattern of soil is affected by fine particle content, clay content, stress state, etc. The failure pattern of samples without clay particles is piping, while that of samples with clay particles is low. When the content of clay particles is high, the seepage deformation of the specimen is hydraulic fracturing. The higher the stress state, the less the permeability deformation of the specimen is. (4) fine particle content, clay content, stress state and other factors have great influence on the soil permeability. When the clay content is less, the permeability of the sample usually decreases first. Under the condition of no additional stress, the permeability of the sample will not change before failure, but will suddenly increase after failure, and the hydraulic gradient will decrease, under the stress state. The permeability of the sample was not changed before the failure, but the hydraulic slope increased suddenly after the failure. The content of fine particles, the content of clay particles and the stress state are the most important factors. The higher the content of fine particles and the content of clay particles, the higher the impervious strength of soil. The greater the stress, the higher the seepage strength of soil.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU411.4

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