本文選題：湛江組結(jié)構(gòu)性黏土　切入點：荷載傳遞函數(shù)　出處：《武漢科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：針對湛江組結(jié)構(gòu)性黏土的工程地質(zhì)特性,采用荷載傳遞法研究湛江組結(jié)構(gòu)性黏土中樁土荷載傳遞的性狀,提出一種新的考慮側(cè)阻軟化的傳遞函數(shù),將這一傳遞函數(shù)運用到以湛江組結(jié)構(gòu)性黏土為載體的樁基工程中,通過對樁在成層土中實測荷載傳遞函數(shù)進(jìn)行非線性擬合,擬合效果良好。將擬合得到的參數(shù)采用位移協(xié)調(diào)法進(jìn)行單樁沉降計算，將得到的計算結(jié)果與實測資料進(jìn)行對比，結(jié)果非常的接近，證明該函數(shù)較好的反映了湛江土中樁土荷載傳遞機(jī)理,適合湛江地區(qū)樁基沉降計算。本文所展開的具體工作以及主要研究成果如下： （1）針對湛江黏土在受到較大荷載時出現(xiàn)結(jié)構(gòu)性損傷及在三軸剪切試驗中的應(yīng)變軟化現(xiàn)象，提出一種考慮側(cè)阻軟化的荷載傳遞函數(shù)，函數(shù)全面的描述了黏土隨著樁土相對位移的增大強(qiáng)度先增大后減小最后維持在一恒定值，，較為準(zhǔn)確的反映了土體的結(jié)構(gòu)性損傷現(xiàn)象。 （2）將提出的傳遞函數(shù)與5種反映側(cè)阻軟化傳遞函數(shù)進(jìn)行比較。與其他側(cè)阻軟化傳遞函數(shù)相比，提出的傳遞函數(shù)較好的反映湛江黏土結(jié)構(gòu)破壞迅速的特點，且能較好的反映黏土的殘余強(qiáng)度。用提出的傳遞函數(shù)研究了土體強(qiáng)度分布不同及樁參數(shù)改變對沉降規(guī)律以及樁身內(nèi)力的分布規(guī)律的影響。 （3）結(jié)合實測單樁靜載荷資料，采用此傳遞函數(shù)對實測點進(jìn)行非線性擬合，結(jié)果表明傳遞函數(shù)對實測點的擬合優(yōu)度較好，用擬合得到的參數(shù)采用荷載傳遞法進(jìn)行單樁沉降計算，得到計算的P S曲線以及特定截面的軸力值，將得到結(jié)果與實測數(shù)據(jù)進(jìn)行比較，數(shù)值非常接近，證明了荷載傳遞法能較好的計算湛江黏土中單樁沉降。 （4）根據(jù)湛江黏土的工程地質(zhì)情況，采用大型通用有限元分析軟件ANSYS分析了成層土中單樁在豎向荷載作用下性狀，建立三維樁土有限元模型，通過建立接觸單元來模擬樁土之間的相互作用，得到樁身及周圍土體的應(yīng)力場分布和位移場分布。
[Abstract]:In view of the engineering geological characteristics of structural clay in Zhanjiang formation, the load transfer behavior of pile-soil in structural clay of Zhanjiang formation is studied by means of load transfer method, and a new transfer function considering lateral resistance softening is proposed. This transfer function is applied to pile foundation engineering with structural clay of Zhanjiang formation as the carrier, and the load transfer function of pile in layered soil is fitted by nonlinear fitting. The fitting effect is good. The parameters obtained by the method of displacement coordination are used to calculate the settlement of single pile, and the calculated results are compared with the measured data, and the results are very close to each other. It is proved that this function reflects the load transfer mechanism of pile-soil in Zhanjiang soil and is suitable for the settlement calculation of pile foundation in Zhanjiang area. The concrete work and main research results of this paper are as follows:. 1) in view of the structural damage of Zhanjiang clay under large loads and the strain softening phenomenon in triaxial shear tests, a load transfer function considering lateral resistance softening is proposed. The function fully describes that the strength of clay increases first and then decreases at a constant value with the increase of the relative displacement of the pile and soil, which accurately reflects the structural damage phenomenon of the soil. 2) the proposed transfer function is compared with five kinds of lateral resistance softening transfer functions. Compared with other lateral resistance softening transfer functions, the proposed transfer function can better reflect the rapid destruction of Zhanjiang clay structure. By using the proposed transfer function, the influence of different soil strength distribution and pile parameters on the settlement law and the distribution law of the internal force of the pile is studied. In combination with the measured static load data of single pile, this transfer function is used for nonlinear fitting of the measured point. The results show that the transfer function has a good goodness of fit for the measured point, and the parameters obtained by the fitting method are used to calculate the settlement of the single pile by load transfer method. The calculated P S curve and the axial force value of the specific section are compared with the measured data, and the values are very close. It is proved that the load transfer method can better calculate the settlement of single pile in Zhanjiang clay. According to the engineering geological conditions of Zhanjiang clay, the behavior of single pile in layered soil under vertical load is analyzed by using large scale finite element analysis software ANSYS, and a three-dimensional pile-soil finite element model is established. By establishing contact element to simulate the interaction between pile and soil, the distribution of stress field and displacement field of pile body and surrounding soil is obtained.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU473.1;TU433

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