本文選題：樁 + 模型試驗��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：關(guān)于水平受荷樁的理論計算方法原則上有多種,其中線彈性地基反力系數(shù)法概念簡單,計算結(jié)果偏于安全,因而在國內(nèi)外得到廣泛應(yīng)用,我國規(guī)范推薦的m法和c法均屬于此類方法。但彈性線地基反力系數(shù)沒有考慮樁身剪切變形的影響,并且在建立方程時采用溫克爾地基模型,忽略了巖土介質(zhì)間的橫向剪切力,這些因素都將導(dǎo)致計算結(jié)果與實際產(chǎn)生偏差。針對該問題本文進行一系列研究,具體工作如下:(1)在規(guī)范推薦的聊法和c法的基礎(chǔ)上,引用可以考慮樁剪切變形的鐵木辛克兩廣義位移梁理論,建立相應(yīng)微分方程,利用冪級數(shù)法對其進行推導(dǎo)求解,求得初參數(shù)方程。結(jié)合實例,通過對比推導(dǎo)理論與原有理論計算結(jié)果間的差異,得到剪切變形對計算結(jié)果影響的結(jié)論,同時對樁的剪切模量進行了敏感性分析。(2)對吳氏雙參數(shù)法進行修正,解決其理論推導(dǎo)時樁長指數(shù)值取值矛盾的問題,為建立一個統(tǒng)一計算公式,在此基礎(chǔ)上引入可以考慮樁剪切變形的鐵木辛克梁理論和考慮巖土介質(zhì)間剪切作用的Pasternak雙參數(shù)地基模型,使理論更加嚴(yán)謹(jǐn)。采用冪級數(shù)法對方程求解,得到該一般式的初參數(shù)方程,為計算方便,編寫相應(yīng)matlab計算程序。新理論能更全面反映樁的實際受力情況,且通過調(diào)節(jié)參數(shù)使其應(yīng)用于更廣泛的范圍。最后結(jié)合實例,驗證推導(dǎo)理論計算方法的正確性,同時對地基的剪切模量進行敏感性分析。(3)開展室內(nèi)模型試驗得到不同樁徑、不同巖土介質(zhì)水平受荷樁沿樁深的內(nèi)力和變形分布曲線,對結(jié)果進行分析。(4)根據(jù)推導(dǎo)通式的解得到考慮剪切變形和巖土介質(zhì)間剪切作用時m法微分方程的解。以模型試驗結(jié)果為參考,通過m法與幾種計算方法(1.考慮樁剪切變形不考慮巖土介質(zhì)間剪切作用;2.考慮巖土介質(zhì)間剪切作用不考慮樁剪切變形;3.同時考慮樁剪切變形和巖土介質(zhì)間剪切作用)結(jié)果的對比,探究樁徑和巖土介質(zhì)變化時各種計算方法間的差異,并對結(jié)果分析,得到一些有用結(jié)論。
[Abstract]:There are many theoretical methods for calculating horizontally loaded piles in principle. Among them, the linear elastic foundation reaction coefficient method is simple in concept and safe in calculation results, so it is widely used at home and abroad. The m method and c method recommended by our country's norm belong to this kind of method. However, the reaction coefficient of elastic line foundation does not take into account the influence of pile shear deformation, and the Winkler foundation model is used to establish the equation, and the transverse shear force between rock and soil is neglected. These factors will lead to the deviation between the calculation results and the practice. In this paper, a series of research on this problem is carried out. The specific work is as follows: (1) on the basis of the recommended chat method and c method, the corresponding differential equation is established by introducing the theory of two generalized displacement beams of Tomusink considering the shear deformation of piles. The power series method is used to derive and solve the initial parameter equation. Combined with an example, by comparing the difference between the theory and the calculation results of the original theory, a conclusion of the influence of shear deformation on the calculation results is obtained. At the same time, the sensitivity analysis of the shear modulus of the pile is carried out, and the Wu's two-parameter method is modified. To solve the problem of the contradiction of pile length index value in theoretical derivation, in order to establish a unified calculation formula, On this basis, the theory of Fermuxink beam which can consider the shear deformation of pile and the Pasternak two-parameter foundation model considering the shear action between rock and soil are introduced, which makes the theory more rigorous. The power series method is used to solve the equation and the initial parameter equation of the general formula is obtained. For the convenience of calculation, the corresponding matlab calculation program is compiled. The new theory can reflect the actual force of pile more comprehensively, and it can be applied to a wider range by adjusting the parameters. Finally, a practical example is given to verify the correctness of the theoretical calculation method. At the same time, sensitivity analysis of the shear modulus of the foundation is carried out. (3) different pile diameters are obtained through laboratory model tests. The distribution curves of internal force and deformation along the pile depth of different horizontal loaded piles with different rock and soil media are analyzed. 4) the solution of m method differential equation considering shear deformation and shear action between rock and soil media is obtained according to the general formula. Based on the model test results, m method and several calculation methods are used. Considering the shear deformation of pile, the shear action between rock and soil is not considered. The shear deformation of pile is not considered when considering the shear action between rock and soil media. At the same time, considering the comparison of the results of pile shear deformation and the shear action between rock and soil media, the differences between various calculation methods of pile diameter and variation of rock and soil media are explored, and some useful conclusions are obtained by analyzing the results.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1

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