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

【摘要】：強夯法聯(lián)合塑料排水板地基處理新技術(shù)自問世以來,在國內(nèi)外的工程應(yīng)用越來越多,與其相關(guān)的理論研究也在不斷深化。在強夯法聯(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)展了低能強夯真空排水法,實踐表明,該工法具有地基處理效果好、工期短、成本低等優(yōu)勢,應(yīng)用前景廣闊。但目前有關(guān)該工法孔壓消散及沉降計算的理論及工程應(yīng)用研究,還有待深入和加強。本文利用前人研究成果,結(jié)合工程實例,研究該工法的孔壓消散和沉降計算,主要工作及取得成果如下:(1)闡述低能強夯真空排水法的研究現(xiàn)狀,進行低能強夯真空排水法與其他傳統(tǒng)工法優(yōu)缺點比較;在已有的強夯與排水固結(jié)理論研究基礎(chǔ)上,圖解分析低能強夯真空排水法加固機理及加固特點,并介紹低能強夯真空排水法的工藝要點和工藝流程。(2)通過孔隙水壓力計算值和現(xiàn)場孔壓監(jiān)測數(shù)據(jù)的分析,研究低能強夯真空排水的孔壓消散特性,進一步闡明該工法的加固機理:通過低能強夯形成上硬下軟的雙層地基,利用真空負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,分別計算孔壓消散理論值,經(jīng)與孔壓現(xiàn)場實測值對比表明:考慮真空壓力計算的孔壓值與實測值更接近、更吻合;孔壓消散速度先快后慢,強夯結(jié)束后第1天,孔壓消散很快,孔壓消散度約達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)生的負壓具有預(yù)壓作用,強夯和真空壓力的耦合作用能加快孔隙水壓力的消散,縮短多遍強夯之間的時間間隔。(4)對低能強夯真空排水法進行沉降分析,基于沖擊荷載作用下雙層地基的形成機制,推演提出低能強夯真空排水法地基沉降計算公式。將該公式用于案例工程沉降計算,經(jīng)與現(xiàn)場實測的沉降數(shù)據(jù)對比,計算值與實測值的偏差為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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU472

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