本文選題：分級(jí)真空排水預(yù)壓法 + 塑料排水板��； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：關(guān)于真空排水預(yù)壓加固軟土地基的方法，現(xiàn)在的研究頗多，，對(duì)真空排水預(yù)壓的加固機(jī)理和設(shè)計(jì)計(jì)算以及施工都有相關(guān)的規(guī)范出版了，但是關(guān)于真空排水預(yù)壓法的研究腳步還在繼續(xù)前進(jìn)。學(xué)者們?yōu)榱苏业礁油晟频恼婵张潘A(yù)壓方法不懈努力。真空排水預(yù)壓法加固軟土地基還有許多問(wèn)題需要深入研究，比如影響真空排水預(yù)壓法加固過(guò)程中出水量的因素以及解決辦法等。鑒于此，本文主要通過(guò)室內(nèi)模型試驗(yàn)對(duì)影響真空排水預(yù)壓法加固過(guò)程中出水量的因素之一（塑料排水板的包裹濾膜）進(jìn)行研究，研究表明： （1）從真空排水預(yù)壓法的應(yīng)力路徑方面看，一次性加荷方式的真空排水預(yù)壓法適用于滲透系數(shù)較大的土體；而分級(jí)加荷的真空排水預(yù)壓法對(duì)滲透系數(shù)較小的土體（如粘土）更加有效。 （2）分級(jí)真空排水預(yù)壓法加固新近飽和吹填土模型試驗(yàn)表明，真空度隨著深度的增加而逐漸減小，與一次性加載的真空排水預(yù)壓法具有相同的規(guī)律。 （3）根據(jù)分級(jí)真空排水預(yù)壓法加固新近飽和吹填土模型試驗(yàn)過(guò)程中出水量、真空度、孔隙水壓力、泥面沉降量的監(jiān)測(cè)可以得知采用尼龍網(wǎng)100目作為排水板包裹濾膜獲得的加固效果最好。真空排水預(yù)壓分級(jí)加載的荷載等級(jí)應(yīng)該是20KPa，40KPa，60KPa，80KPa。以這種等級(jí)加載，應(yīng)該能使土體的排水量更加大，土體含水率更加的低，加固完成后應(yīng)該能夠獲得更加好的加固效果。 （4）通過(guò)分級(jí)真空排水預(yù)壓法加固新近飽和吹填土的室內(nèi)模型試驗(yàn)，綜合分析可知，采用100目尼龍網(wǎng)作為塑料排水板包裹濾膜的加固效果比采用150目的尼龍網(wǎng)和200目的尼龍網(wǎng)作為塑料排水板包裹濾膜的加固效果要好，所以本文建議在實(shí)際工程中能夠采用100目尼龍網(wǎng)作為塑料排水板的包裹濾膜。 （5）通過(guò)分級(jí)真空排水預(yù)壓法的室內(nèi)模型試驗(yàn)，采用新型排水體（在砂袋內(nèi)部插入塑料排水板作為豎向排水通道）進(jìn)行加固，獲得了很好的加固效果，可以進(jìn)行現(xiàn)場(chǎng)試驗(yàn)進(jìn)行驗(yàn)證。 （6）通過(guò)大型有限元軟件abaqus對(duì)真空排水預(yù)壓法加固砂井地基進(jìn)行模擬，根據(jù)模擬后的砂井地基平均固結(jié)度和砂井地基孔隙水壓力消散可以得出，采用100目尼龍網(wǎng)作為包裹濾膜的地基平均固結(jié)度要大，并且其固結(jié)度增長(zhǎng)速率和孔隙水壓力消散速率較快。與室內(nèi)模型試驗(yàn)相比較具有相同的結(jié)論。
[Abstract]:There is a lot of research on the method of strengthening soft soil foundation by vacuum drainage preloading, and some related codes have been published for the reinforcement mechanism, design calculation and construction of vacuum drainage preloading. But the research on vacuum drainage preloading is still advancing. Scholars make unremitting efforts to find more perfect vacuum drainage preloading method. There are still many problems to be studied in the consolidation of soft soil foundation by vacuum drainage preloading method, such as the factors that affect the water output in the process of strengthening by vacuum drainage preloading method and the solutions, and so on. In view of this, this paper mainly through the indoor model test to study one of the factors that affect the water output in the consolidation process of vacuum drainage preloading method (plastic drainage plate coated filter membrane), the study shows that: 1) from the point of view of stress path of vacuum drainage preloading method, vacuum drainage preloading method with one-off loading method is suitable for soil with large permeability coefficient; The vacuum drainage preloading method with graded loading is more effective for the soil with small permeability coefficient (such as clay). (2) the model tests on the consolidation of newly saturated filled soil by the staged vacuum drainage preloading method show that the vacuum degree decreases gradually with the increase of the depth, which has the same rule as the vacuum drainage preloading method. According to the method of graded vacuum drainage preloading, the water output, vacuum degree, pore water pressure during the model test of newly saturated filled soil are strengthened. Monitoring the settlement of mud surface shows that the best reinforcement effect is obtained by using Nylon mesh 100 mesh as the filter membrane wrapped with drainage board. The loading grade of vacuum drainage preloading grade should be 20 KPA 40 KPA or 60 KPA / 80 KPA. With this grade loading, the displacement of soil should be increased, the moisture content of soil should be lower, and the reinforcement effect should be better. (4) the indoor model test on the consolidation of newly saturated filled soil by the method of graded vacuum drainage preloading, and the comprehensive analysis shows that, The reinforcement effect of 100 mesh nylon mesh as plastic drainage plate wrapped filter membrane is better than that of 150 purpose nylon net and 200 purpose nylon net as plastic drainage board wrapped filter membrane. Therefore, it is suggested that 100 mesh nylon mesh can be used as the wrapping membrane of plastic drainage board in practical engineering. 5) through the indoor model test of the graded vacuum drainage preloading method, a new type of drainage body (plastic drainage board is inserted into the sand bag as a vertical drainage passage) is used to reinforce it, and a very good reinforcement effect is obtained. It can be verified by field test. (6) the consolidation of sand well foundation by vacuum drainage preloading method is simulated by finite element software abaqus. According to the average consolidation degree of sand well foundation and pore water pressure dissipation of sand well foundation after simulation, it can be obtained. The average consolidation degree of the foundation with 100 mesh nylon mesh as the encapsulated membrane is large, and the increase rate of consolidation degree and the dissipation rate of pore water pressure are faster. The conclusion is the same as that of indoor model test.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU472.33

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