本文關(guān)鍵詞：抗滑樁邊坡降雨入滲分析　出處：《湘潭大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 降雨入滲 邊坡穩(wěn)定 抗滑樁 強度折減法 ABAQUS

【摘要】：邊坡穩(wěn)定研究是巖土、土木工程領(lǐng)域的重要研究課題，正確分析邊坡穩(wěn)定性問題，對加強工程建設(shè)的指導(dǎo)、確保人民生命財產(chǎn)的安全，意義十分重大�？够瑯妒沁吰率Х�(wěn)防治加固的主要措施之一，它能夠有效支擋滑坡推力，增強邊坡的穩(wěn)定性，且具有良好的經(jīng)濟效益。降雨是引起邊坡失穩(wěn)的重要因素之一，雨水下落對邊坡表層造成動能沖擊，雨水入滲能降低巖土強度參數(shù)，減小邊坡的抗剪強度。本文將降雨滲流影響和抗滑樁加固邊坡穩(wěn)定的研究現(xiàn)狀歸納和概括。闡述了抗滑樁支護邊坡技術(shù)，介紹了幾種常用的支護類型，并列舉了抗滑樁支護邊坡的優(yōu)越性。在總結(jié)前人研究成果的基礎(chǔ)上，將強度折減原理同ABAQUS相結(jié)合，考慮流固耦合和接觸，建立了抗滑樁邊坡入滲數(shù)值模型，對邊坡的穩(wěn)定性進行研究分析。主要研究成果如下： （1）用基于強度折減理論ABAQUS的有限元分析模型求出邊坡的安全系數(shù)，將其與理正計算出來的安全系數(shù)（基于傳統(tǒng)瑞典條分法和Janbu法）進行對比，發(fā)現(xiàn)三者的數(shù)值變化非常接近，驗證了基于強度折減理論的降雨入滲邊坡模型在ABAQUS軟件的適用性。 （2）通過降雨時長對邊坡的影響穩(wěn)定的分析，發(fā)現(xiàn)隨著降雨時間的持續(xù)，邊坡的安全系數(shù)出現(xiàn)較為明顯的減少。降雨24h后，安全系數(shù)下降到1.022，當降雨達到72h后，雨水入滲大大降低了土體的抗剪承載力，隨著入滲深度加大，邊坡穩(wěn)定性越趨于危險，安全系數(shù)下降較大幅度僅為0.875小于1.0，表明減少降雨時長對邊坡穩(wěn)定有一定的效果。 （3）建立抗滑樁邊坡入滲有限元模型，對入滲邊坡的穩(wěn)定進行分析。研究表明：1）通過對降雨時長影響分析，，隨著持續(xù)降雨邊坡土體飽和度值開始上升，由于樁的阻礙作用，抗滑樁左側(cè)與右側(cè)有較為明顯的階梯狀態(tài)；由于抗滑樁作用，在樁體下側(cè)土體開始形成新的平衡體系，新形成的小邊坡開始出現(xiàn)新的坡角應(yīng)力。該坡腳處的應(yīng)力繼續(xù)增加，抗滑樁樁側(cè)與樁頂處也有持續(xù)增長的應(yīng)力。2）抗滑樁樁長的增加能有效遏制邊坡位移的增加，最大位移隨樁長增長有減少的趨勢，在樁長的附近出現(xiàn)了位移集中。當樁長超過一定限值，樁長對位移的影響又出現(xiàn)了弱化。3）通過對抗滑樁設(shè)樁位置進行分析，發(fā)現(xiàn)抗滑樁設(shè)置在滑裂面處，能有效阻止土體位移，設(shè)在滑裂面中部偏下，貢獻最大，其他位置逐漸弱化，偏離滑裂面則貢獻微弱。4）對抗滑樁樁體位移和受力進行分析，發(fā)現(xiàn)樁身上部發(fā)生彎曲變形，樁頂位移最大，其變形模式表現(xiàn)為剪切型。
[Abstract]:Slope stability research is an important research topic in the field of geotechnical and civil engineering. The correct analysis of slope stability can strengthen the guidance of engineering construction and ensure the safety of people's life and property. The anti-slide pile is one of the main measures to prevent and strengthen the slope instability. It can effectively support the landslide thrust and enhance the slope stability. Rainfall is one of the important factors causing slope instability. Rain Water's fall causes kinetic energy impact on the surface of the slope. Rain Water infiltration can reduce the geotechnical strength parameters. In this paper, the influence of rainfall seepage and the stability of slope strengthened by anti-slide pile are summarized and summarized. The technology of anti-slide pile supporting slope is expounded, and several kinds of common supporting types are introduced. On the basis of summarizing the previous research results, the strength reduction principle is combined with ABAQUS to consider fluid-solid coupling and contact. The numerical model of anti-slide pile slope infiltration is established, and the stability of the slope is studied and analyzed. The main research results are as follows: 1) the safety factor of slope is calculated by using the finite element analysis model based on strength reduction theory (ABAQUS). By comparing it with the calculated safety factor (based on the traditional Swedish slice method and Janbu method), it is found that the three values are very close to each other. The applicability of rainfall infiltration slope model based on strength reduction theory in ABAQUS software is verified. 2) through the analysis of the influence of rainfall duration on slope stability, it is found that the safety factor of slope decreases obviously with the duration of rainfall, and after 24 hours of rainfall. The safety factor decreased to 1.022. After 72 hours of rainfall, Rain Water infiltration greatly reduced the shear bearing capacity of soil. With the increase of infiltration depth, slope stability became more and more dangerous. The decrease of safety factor is only 0.875 less than 1.0, which indicates that reducing rainfall duration has certain effect on slope stability. Finally, the finite element model of anti-slide pile slope infiltration is established to analyze the stability of the infiltration slope. The research shows that the value of soil saturation of the slope begins to rise with the continuous rainfall through the analysis of the influence of rainfall duration. Because of the hindrance of the pile, the left and the right side of the anti-slide pile have obvious ladder state. Due to the action of anti-slide pile, a new equilibrium system began to form in the soil of the bottom of the pile, and the new angle stress began to appear in the newly formed small slope, and the stress at the bottom of the slope continued to increase. The increase of pile length can effectively restrain the increase of slope displacement, and the maximum displacement decreases with the increase of pile length. Displacement concentration occurs near the pile length. When the pile length exceeds a certain limit, the influence of pile length on displacement is weakened. 3) by analyzing the position of anti-slide pile, it is found that the anti-slide pile is located on the sliding crack surface. Can effectively prevent the soil displacement, located in the middle of the sliding fracture plane, the largest contribution, the other position gradually weakened, deviated from the sliding surface contribution is weak. 4) the analysis of the displacement and force of the pile body. It is found that bending deformation occurs in the pile body and the top displacement of the pile is the largest, and its deformation mode is shear type.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU473.1

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