本文選題：軟地基處理　切入點：真空預壓法　出處：《西南交通大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著我國基礎建設快速發(fā)展,在工業(yè)民用建筑、市政工程、道路與鐵道工程、港口工程等領域常會遇到軟地基處理問題。真空預壓法具有工程量小、成本較低和對環(huán)境影響較小等優(yōu)點,采用真空預壓法處理軟地基備受關注。但是傳統(tǒng)真空預壓法由于存在排水板淤堵等問題,致使其在實際工程中作用效果欠佳。本文采用了資料調研、理論分析、室內試驗等手段對真空預壓法裝置關鍵技術開展了研究,研究成果對于實際軟地基處理有一定的借鑒意義。論文通過文獻和工程資料的收集和分析,總結了傳統(tǒng)真空預壓法的某些不足,如理論研究不夠深入,實際工程中出現(xiàn)排水板變形、排水排氣通道淤堵、處理區(qū)真空度衰減顯著、固結效果不佳等。在充分研究了井點井+呼吸井真空預壓系統(tǒng)作用機理的基礎上,總結了井點井+呼吸井真空預壓系統(tǒng)的技術特點,同時利用土體滲透理論和土體固結理論,對井點井+呼吸井真空預壓系統(tǒng)裝置存在的局部壓實、裝置淤堵等問題進行了理論分析。提出了通過設置由格柵和礫石組成的防堵濾層和高壓氣體反沖震蕩措施,實現(xiàn)對井點井+呼吸井真空預壓系統(tǒng)裝置的改進。本文針對井點井防堵濾層設置和氣體反沖震蕩效果開展了試驗研究。通過更換多種濾料和格柵,試驗均證明了在井點井外側設置防堵濾層能起到一定程度的防淤堵作用。由試驗找出了可采用的礫石粒徑和格柵孔徑組合參考范圍為1mm～20mm。在此基礎上重點研究了濾料粒徑、格柵孔徑不同組合與排水效率的關系:當采用同一種礫石時,孔徑為1mm的格柵排水效率與孔徑5mm和10mm的格柵基本一致;當采用同一種格柵時,粒徑為20mm的礫石組合初期排水效率最高,粒徑為1mm的礫濾層初期排水效率較低,但后期排水效率最佳。綜合分析認為濾層采用1mm孔徑格柵和1mm粒徑的粗砂組合下防止淤堵效果最好。試驗還證明了向井點井濾層內間歇性鼓入高壓氣體,不僅能預防裝置淤堵,還能在一定程度打通真空井周圍被壓實土體,提高排水排氣效果。
[Abstract]:With the rapid development of infrastructure in China, soft foundation treatment problems are often encountered in the fields of industrial and civil construction, municipal engineering, road and railway engineering, port engineering, etc. Due to the advantages of low cost and less environmental impact, the application of vacuum preloading to soft foundation treatment has attracted much attention. However, the traditional vacuum preloading method has some problems, such as the blockage of drainage plate, and so on. In this paper, the key technology of vacuum preloading device is studied by means of data investigation, theoretical analysis and laboratory test. The research results have certain reference significance for the actual soft foundation treatment. Through the collection and analysis of the literature and engineering data, the paper summarizes some shortcomings of the traditional vacuum preloading method, such as the theoretical research is not deep enough, In the actual engineering, the drainage plate is deformed, the drainage exhaust passage is blocked, the vacuum degree in the treatment area is attenuated significantly, and the consolidation effect is not good, etc. Based on the study of the mechanism of the vacuum preloading system of the well point well breathing well, the mechanism of the vacuum preloading system of the well point well breathing well is studied. The technical characteristics of vacuum preloading system for well point well breathing well are summarized. At the same time, by using soil permeability theory and soil consolidation theory, the local compaction of vacuum preloading system in well point well breathing well is made. In this paper, the problems of blockage in the device are analyzed theoretically. The anti-blocking filter layer composed of grille and gravel and the backwash oscillation measures of high pressure gas are put forward. The improvement of vacuum preloading system for well point well breathing well is realized in this paper. The experimental study is carried out on the setting of plugging and filtering layer and the effect of gas recoil oscillation in well spot well. By replacing various filter materials and grille, The test results show that the plugging and filtering layer can play a certain role in preventing silting. The suitable reference range of gravel diameter and grid pore size combination is found to be 1mm ~ 20mm. on the basis of this, the filter media particle size is studied emphatically. The relationship between different combinations of grid aperture and drainage efficiency: when the same gravel is used, the drainage efficiency of 1 mm grid is basically the same as that of 5 mm and 10 mm aperture, and when the same grille is used, The initial drainage efficiency of gravel combination with diameter of 20 mm is the highest, and the initial drainage efficiency of gravel filter with diameter of 1 mm is lower. The comprehensive analysis shows that the combination of coarse sand with 1 mm pore diameter and 1 mm diameter is the best to prevent silt blockage. The experiment also proves that intermittent injection of high pressure gas into the filter layer of well point well can not only prevent the device from blockage. It can also improve the drainage and exhaust effect by compacting soil around the vacuum well to a certain extent.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU472.33

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