本文選題：低能強(qiáng)夯法 + 真空壓力　； 參考：《福建農(nóng)林大學(xué)》2017年碩士論文

【摘要】：強(qiáng)夯法聯(lián)合塑料排水板地基處理新技術(shù)自問(wèn)世以來(lái),在國(guó)內(nèi)外的工程應(yīng)用越來(lái)越多,與其相關(guān)的理論研究也在不斷深化。在強(qiáng)夯法聯(lián)合塑料排水板地基處理技術(shù)基礎(chǔ)上,為了適應(yīng)臨近建筑物和道路設(shè)施,且先行大面積填方的軟基處理施工,發(fā)展了低能強(qiáng)夯真空排水法,實(shí)踐表明,該工法具有地基處理效果好、工期短、成本低等優(yōu)勢(shì),應(yīng)用前景廣闊。但目前有關(guān)該工法孔壓消散及沉降計(jì)算的理論及工程應(yīng)用研究,還有待深入和加強(qiáng)。本文利用前人研究成果,結(jié)合工程實(shí)例,研究該工法的孔壓消散和沉降計(jì)算,主要工作及取得成果如下:(1)闡述低能強(qiáng)夯真空排水法的研究現(xiàn)狀,進(jìn)行低能強(qiáng)夯真空排水法與其他傳統(tǒng)工法優(yōu)缺點(diǎn)比較;在已有的強(qiáng)夯與排水固結(jié)理論研究基礎(chǔ)上,圖解分析低能強(qiáng)夯真空排水法加固機(jī)理及加固特點(diǎn),并介紹低能強(qiáng)夯真空排水法的工藝要點(diǎn)和工藝流程。(2)通過(guò)孔隙水壓力計(jì)算值和現(xiàn)場(chǎng)孔壓監(jiān)測(cè)數(shù)據(jù)的分析,研究低能強(qiáng)夯真空排水的孔壓消散特性,進(jìn)一步闡明該工法的加固機(jī)理:通過(guò)低能強(qiáng)夯形成上硬下軟的雙層地基,利用真空負(fù)壓使下臥層與加固層形成壓力差,聯(lián)合豎向塑料排水板使土體中孔隙水快速排出,孔隙水壓力消散,土體固結(jié)沉降。(3)分不考慮和考慮真空壓力兩種情況,分別計(jì)算孔壓消散理論值,經(jīng)與孔壓現(xiàn)場(chǎng)實(shí)測(cè)值對(duì)比表明:考慮真空壓力計(jì)算的孔壓值與實(shí)測(cè)值更接近、更吻合;孔壓消散速度先快后慢,強(qiáng)夯結(jié)束后第1天,孔壓消散很快,孔壓消散度約達(dá)40%,之后孔壓消散度逐漸減小直至趨于某一限值;土體的再固結(jié)體積壓縮系數(shù)影響孔壓消散速度,再固結(jié)體積壓縮系數(shù)越大,孔隙水壓力消散得越快;真空管產(chǎn)生的負(fù)壓具有預(yù)壓作用,強(qiáng)夯和真空壓力的耦合作用能加快孔隙水壓力的消散,縮短多遍強(qiáng)夯之間的時(shí)間間隔。(4)對(duì)低能強(qiáng)夯真空排水法進(jìn)行沉降分析,基于沖擊荷載作用下雙層地基的形成機(jī)制,推演提出低能強(qiáng)夯真空排水法地基沉降計(jì)算公式。將該公式用于案例工程沉降計(jì)算,經(jīng)與現(xiàn)場(chǎng)實(shí)測(cè)的沉降數(shù)據(jù)對(duì)比,計(jì)算值與實(shí)測(cè)值的偏差為6%～10%,較好滿足工程精度要求,可供同類工程應(yīng)用參考。
[Abstract]:Since the advent of the new technology of dynamic compaction combined with plastic drainage plate foundation treatment, it has been applied more and more in engineering at home and abroad, and the theoretical research related to it has been deepened. On the basis of dynamic compaction combined with plastic drainage board foundation treatment technology, in order to adapt to the construction of adjacent buildings and road facilities, and to advance the soft foundation treatment construction of large area fill, the vacuum drainage method of low energy dynamic compaction is developed. The practice shows that, The method has the advantages of good foundation treatment effect, short construction period, low cost and so on. However, the theoretical and engineering application of the method for pore pressure dissipation and settlement calculation needs to be further developed and strengthened. In this paper, the pore pressure dissipation and settlement calculation of this method are studied with previous research results and engineering examples. The main work and results are as follows: 1) the research status of vacuum drainage method with low energy dynamic compaction is described. The advantages and disadvantages of vacuum drainage method with low energy dynamic compaction and other traditional methods are compared, and on the basis of the existing research on the theory of dynamic compaction and drainage consolidation, the strengthening mechanism and characteristics of vacuum drainage method with low energy dynamic compaction are analyzed graphically. The main process points and technological process of vacuum drainage with low energy dynamic compaction are introduced. Through the analysis of pore water pressure calculation value and field pore pressure monitoring data, the pore pressure dissipation characteristics of vacuum drainage with low energy dynamic compaction are studied. The reinforcement mechanism of this method is further expounded: the double layer foundation is formed by low energy dynamic compaction, the pressure difference between the horizontal layer and the strengthened layer is formed by vacuum negative pressure, and the pore water in the soil is discharged quickly by the combination of vertical plastic drainage plate, Pore water pressure dissipates and soil consolidation settlement. 3) the theoretical value of pore pressure dissipation is calculated separately without considering or considering vacuum pressure. The comparison with the field measured value of pore pressure shows that the pore pressure calculated by considering vacuum pressure is closer to the measured value. The velocity of pore pressure dissipation is faster than that of slow one day after dynamic compaction the pore pressure dissipates quickly and the dissipation degree of pore pressure reaches about 40. After that the dissipation degree of pore pressure decreases gradually until it tends to a certain limit. The coefficient of reconsolidation volume compression affects the velocity of pore pressure dissipation. The larger the coefficient of volume compression of soil is, the faster the pore water pressure dissipates, and the negative pressure produced by vacuum tube has preloading effect. The coupling effect of dynamic compaction and vacuum pressure can accelerate the dissipation of pore water pressure, shorten the time interval between dynamic compaction for many times, and analyze the settlement of vacuum drainage method with low energy dynamic compaction. Based on the formation mechanism of double-layer foundation under impact load, the coupling effect of dynamic compaction and vacuum pressure can accelerate the dissipation of pore water pressure. The calculation formula of foundation settlement by vacuum drainage method of low energy dynamic compaction is deduced. The formula is applied to the settlement calculation of case engineering. Compared with the settlement data measured on the spot, the deviation between the calculated value and the measured value is 6 / 10, which can meet the requirements of engineering precision and can be used as a reference for similar projects.
【學(xué)位授予單位】：福建農(nóng)林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU472

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 謝偉樹(shù);吳能森;張巖;林鴻基;吳磊;;高真空擊密法在某先填土軟基處理工程中的應(yīng)用[J];河南城建學(xué)院學(xué)報(bào);2017年02期

2 季永新;張斌斌;趙蕊;左雙英;;貴陽(yáng)紅黏土固結(jié)排水孔隙水壓力消散歸一化分析[J];貴州大學(xué)學(xué)報(bào)(自然科學(xué)版);2017年02期

3 岳敏;徐俊義;孔德旭;侯國(guó)忠;;軟弱地基高真空擊密法處理技術(shù)研究[J];價(jià)值工程;2017年07期

4 倪靜;朱穎;陳有亮;杜曦;Cholachat Rujikiatkamjorn;;循環(huán)荷載作用下豎向排水板加固軟黏土的孔隙水壓力累積特性研究[J];巖土力學(xué);2016年02期

5 李彬;余鑫;;分析地基處理新技術(shù)及發(fā)展形勢(shì)[J];科技與企業(yè);2015年18期

6 吳能森;許旭堂;崔廣強(qiáng);徐青;郭瑤涵;劉湘鍇;;軟土地區(qū)PHC長(zhǎng)樁單樁極限承載力的灰色預(yù)測(cè)[J];西華大學(xué)學(xué)報(bào)(自然科學(xué)版);2015年03期

7 舒?zhèn)デ?;強(qiáng)夯法加固深度計(jì)算方法的對(duì)比與分析[J];中國(guó)水運(yùn)(下半月);2013年08期

8 張育紅;;軟土路基常用處理方法及高真空擊密法分析[J];民營(yíng)科技;2013年02期

9 許綺炎;樓曉明;徐士龍;;強(qiáng)夯法施工工藝發(fā)展綜述及對(duì)各種吹填土的適用性[J];福建建筑;2013年01期

10 張二林;張宇亭;黃玉龍;;潮汐作用下飽和軟粘土地基孔隙水壓力變化規(guī)律研究[J];水道港口;2012年03期

相關(guān)碩士學(xué)位論文 前9條

1 韓治勇;高真空排水+強(qiáng)夯動(dòng)靜耦合軟基加固機(jī)理研究[D];合肥工業(yè)大學(xué);2016年

2 王鋒;軟土路基沉降預(yù)測(cè)與加固技術(shù)研究[D];重慶交通大學(xué);2013年

3 陳霞;軟硬層地基的變形特性分析[D];燕山大學(xué);2013年

4 王越虹;低能量強(qiáng)夯聯(lián)合井點(diǎn)降水處理沿海軟質(zhì)地基的應(yīng)用研究[D];青島理工大學(xué);2011年

5 劉銳鋒;非飽和土強(qiáng)夯加固地基沉降特性研究[D];西南交通大學(xué);2011年

6 邵榮春;強(qiáng)夯加固機(jī)理及強(qiáng)夯影響效果研究分析[D];中南大學(xué);2007年

7 李選民;軟土路基排水固結(jié)研究與有限元分析[D];中南大學(xué);2006年

8 劉英春;低能強(qiáng)夯與真空降水聯(lián)合法加固地基的分析研究[D];山東大學(xué);2006年

9 王建華;強(qiáng)夯地基的變形及沉降計(jì)算方法研究[D];中南大學(xué);2003年

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