本文選題：長(zhǎng)短樁 + 復(fù)合地基��； 參考：《華北科技學(xué)院》2017年碩士論文

【摘要】：隨著建筑物向高層、深基方向發(fā)展,對(duì)于地基抵抗變形的要求越來(lái)越高,長(zhǎng)短樁復(fù)合地基處理技術(shù)也因此在工程實(shí)踐中發(fā)展起來(lái)。長(zhǎng)短樁復(fù)合地基能充分發(fā)揮樁體和土體的特性,達(dá)到控制沉降、提高安全系數(shù)的目的。但是隨著長(zhǎng)短樁復(fù)合地基處理方式越來(lái)越復(fù)雜,其沉降引發(fā)的安全問(wèn)題越來(lái)越突出。因此有必要對(duì)長(zhǎng)短樁復(fù)合地基進(jìn)行深入的研究。本文首先對(duì)長(zhǎng)短樁復(fù)合地基的沉降變形和承載特性進(jìn)行研究。然后對(duì)長(zhǎng)短樁復(fù)合地基沉降計(jì)算方法進(jìn)行比較分析。最后通過(guò)建立GA-SVM模型對(duì)長(zhǎng)短樁復(fù)合地基進(jìn)行沉降預(yù)測(cè)。主要研究?jī)?nèi)容和成果如下:(1)通過(guò)室內(nèi)試驗(yàn)?zāi)Ｐ偷慕?研究樁體的樁長(zhǎng)、樁徑、墊層厚度變化對(duì)沉降變形的影響,揭示長(zhǎng)短樁復(fù)合地基的沉降變化規(guī)律。結(jié)果表明:增加長(zhǎng)樁長(zhǎng)度、短樁長(zhǎng)度、樁徑、減小墊層厚度對(duì)地基沉降控制有顯著效果。(2)通過(guò)對(duì)長(zhǎng)短樁復(fù)合地基的樁身應(yīng)力、樁土應(yīng)力比和下臥層應(yīng)力進(jìn)行分析,揭示長(zhǎng)短樁復(fù)合地基的應(yīng)力特性。結(jié)果表明:樁身應(yīng)力會(huì)出現(xiàn)一個(gè)峰值,且該峰值處的樁身應(yīng)力最大;樁頂?shù)臉锻翍?yīng)力比先增大后減小,樁端的樁土應(yīng)力比逐漸增大;下臥層樁身應(yīng)力相比周?chē)馏w應(yīng)力較大。(3)結(jié)合工程實(shí)例對(duì)長(zhǎng)短樁復(fù)合地基沉降計(jì)算方法進(jìn)行分析,并對(duì)其沉降計(jì)算值與實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比研究。結(jié)果表明:等效天然地基計(jì)算計(jì)算結(jié)果比較符合實(shí)際,加權(quán)模量法計(jì)算雖然比較簡(jiǎn)單,但是沉降計(jì)算的誤差比較大。(4)通過(guò)GA-SVM預(yù)測(cè)模型對(duì)長(zhǎng)短樁復(fù)合地基沉降進(jìn)行預(yù)測(cè)研究。結(jié)果表明:GA-SVM對(duì)長(zhǎng)短樁復(fù)合地基進(jìn)行預(yù)測(cè)擬合程度較好,其沉降預(yù)測(cè)與現(xiàn)場(chǎng)實(shí)測(cè)值誤差較小。本文提出的GA-SVM模型對(duì)長(zhǎng)短樁復(fù)合地基沉降預(yù)測(cè)具有良好的預(yù)測(cè)精度和適用性,對(duì)于巖土工程的安全預(yù)測(cè)具有良好的指導(dǎo)作用。
[Abstract]:With the development of high building and deep foundation, the requirement of resisting deformation of foundation is more and more high, and the treatment technology of long-long pile composite foundation has been developed in engineering practice. Long and short pile composite foundation can give full play to the characteristics of pile and soil to control settlement and improve safety factor. But as the treatment of long and short pile composite foundation becomes more and more complex, the safety problems caused by its settlement become more and more prominent. Therefore, it is necessary to study the long-long pile composite foundation. In this paper, the settlement, deformation and bearing characteristics of long and short pile composite foundation are studied. Then the settlement calculation method of long and short pile composite foundation is compared and analyzed. Finally, GA-SVM model is established to predict the settlement of long-long pile composite foundation. The main research contents and results are as follows: (1) through the establishment of laboratory test model, the influence of pile length, pile diameter and cushion thickness on settlement deformation is studied, and the rule of settlement variation of long-long pile composite foundation is revealed. The results show that increasing the length of long pile, the length of short pile, the diameter of pile and reducing the thickness of cushion have remarkable effect on the control of foundation settlement. The stress characteristics of long and short pile composite foundation are revealed. The results show that there will be a peak value of pile stress, and the pile body stress at the peak value will be the largest, and the pile-soil stress ratio of the pile top will first increase and then decrease, and the pile-soil stress ratio at the end of the pile will increase gradually. Combined with engineering examples, the settlement calculation method of long-long pile composite foundation is analyzed, and the calculated value of settlement is compared with the measured data. The results show that the calculation results of the equivalent natural foundation are in good agreement with the reality. Although the calculation of weighted modulus method is simple, the error of settlement calculation is relatively large. 4) the settlement of long-long pile composite foundation is forecasted by GA-SVM model. The results show that the weight GA-SVM can predict the composite foundation with long and short piles, and the error between settlement prediction and field measurement is small. The GA-SVM model proposed in this paper has good prediction accuracy and applicability for the settlement prediction of long-long pile composite foundation, and has a good guiding function for the safety prediction of geotechnical engineering.
【學(xué)位授予單位】：華北科技學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU753

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 沈陽(yáng);王麗芬;林大超;;基坑近鄰地表沉降的GA-SVM建模研究[J];華北科技學(xué)院學(xué)報(bào);2016年05期

2 葉澤川;張麗華;曹偉;張昌進(jìn);;組合樁復(fù)合地基沉降計(jì)算方法的探討[J];華北科技學(xué)院學(xué)報(bào);2015年06期

3 曹云;徐奮強(qiáng);;基于改進(jìn)遺傳算法的長(zhǎng)短樁復(fù)合地基優(yōu)化設(shè)計(jì)[J];水文地質(zhì)工程地質(zhì);2011年06期

4 張麗華;蔡美峰;;基于改進(jìn)泊松-復(fù)合小波模型的復(fù)合地基全過(guò)程沉降預(yù)測(cè)[J];北京科技大學(xué)學(xué)報(bào);2007年09期

5 張麗華;于曉東;牛芩濤;;高層建筑CFG樁復(fù)合地基沉降的全過(guò)程安全控制[J];煤炭工程;2006年10期

6 張麗華;蔡美峰;牛慶蓮;;復(fù)合地基全過(guò)程沉降預(yù)測(cè)的威布爾模型[J];工業(yè)建筑;2006年10期

7 董必昌,王靖濤,易宙子;CFG樁復(fù)合地基沉降計(jì)算與數(shù)字仿真[J];工業(yè)建筑;2005年S1期

8 李海芳,龔曉南;路堤下復(fù)合地基沉降影響因素有限元分析[J];工業(yè)建筑;2005年06期

9 蔣鑫,邱延峻,周成;福廈線粉噴樁復(fù)合地基有限元分析[J];工程地質(zhì)學(xué)報(bào);2005年01期

10 周德泉,張可能,劉宏利;組合樁型復(fù)合地基樁、土受力特性的試驗(yàn)對(duì)比與分析[J];巖石力學(xué)與工程學(xué)報(bào);2005年05期

相關(guān)博士學(xué)位論文 前1條

1 鄭俊杰;復(fù)合地基承載特性分析及設(shè)計(jì)方法研究[D];浙江大學(xué);2001年

相關(guān)碩士學(xué)位論文 前4條

1 葉澤川;組合樁復(fù)合地基沉降與可靠度研究[D];華北科技學(xué)院;2016年

2 劉洋;長(zhǎng)短樁復(fù)合地基的數(shù)值模擬及分析[D];河北工程大學(xué);2014年

3 崔曙東;基于GA-SVM的煤矸石混合料抗壓強(qiáng)度預(yù)測(cè)研究[D];河北工程大學(xué);2013年

4 李紅艷;剛性長(zhǎng)短樁復(fù)合地基工作機(jī)理分析[D];河北工程大學(xué);2009年

，

本文編號(hào)：2016819