【摘要】：雙排樁作為一種新型的深基坑支護(hù)體系最早出現(xiàn)于上個世紀(jì)80年代末期,由于研究起步較晚,目前對雙排樁的受力機(jī)理國內(nèi)外還沒有統(tǒng)一的計算模式,仍處于半理論半經(jīng)驗狀態(tài)。本人在前人的的研究基礎(chǔ)上,將雙排樁的研究范圍擴(kuò)大,結(jié)合工程實例,將現(xiàn)場雙排樁按比例縮小至室內(nèi)模型試驗,通過模型試驗及有限元模擬對采用梁和板兩種不同聯(lián)系結(jié)構(gòu)的雙排樁進(jìn)行了較系統(tǒng),較深入的研究,分析得出哪種聯(lián)系結(jié)構(gòu)綜合效益更高,主要研究成果如下： (1)通過室內(nèi)模型試驗,分析研究在前后排樁間距分別取4d、5d、6d的條件下,對于采用梁、板兩種聯(lián)系結(jié)構(gòu)形式的雙排樁支護(hù)結(jié)構(gòu)在樁頂位移、樁身變形及土壓力分布方面的不同變化情況。試驗結(jié)果表明：梁、板聯(lián)系結(jié)構(gòu)形式的雙排樁樁頂位移累計變化值都隨著基坑開挖深度的增加而增加；采用板聯(lián)系結(jié)構(gòu)的雙排樁樁頂位移累計變化值略小于梁聯(lián)系結(jié)構(gòu)的雙排樁樁頂位移累計變化值；兩種聯(lián)系結(jié)構(gòu)樁頂位移累計變化值均隨著前后排樁間距的增大而減小。開挖至坑底標(biāo)高時,梁聯(lián)系結(jié)構(gòu)的前排樁樁身正負(fù)彎矩值均小于板聯(lián)系結(jié)構(gòu)；后排樁則相反,梁聯(lián)系結(jié)構(gòu)大于板聯(lián)系結(jié)構(gòu)；兩種聯(lián)系結(jié)構(gòu)形式的雙排樁樁身彎矩均隨前后排樁間距增大而增大；前后排樁間的土壓力,由于受樁的影響較大,實測土壓力分布規(guī)律不好,試驗中實測樁間土壓力隨開挖深度的增加呈遞減趨勢。 (2)結(jié)合工程實例,采用大型有限元軟件ABAQUS結(jié)合工程實例對模型試驗及工程現(xiàn)場基坑開挖過程進(jìn)行計算模擬,分析兩種聯(lián)系結(jié)構(gòu)的雙排樁支護(hù)結(jié)構(gòu)體系在樁頂位移、樁身彎矩及土壓力分布的不同情況,模擬得出結(jié)論與室內(nèi)模型試驗結(jié)論基本一致,通過工程實測數(shù)據(jù)與數(shù)值模擬成果進(jìn)行分析對比,驗證了本文結(jié)果的合理性。
[Abstract]:As a new type of deep foundation pit supporting system, double-row pile was first found in the late 1980s. Due to the late start of the research, there is no unified calculation model for the stress mechanism of double-row pile at home and abroad. It is still in a semi-theoretical and semi-empirical state. On the basis of previous research, I expand the research scope of double-row pile, combining with engineering example, reduce the field double-row pile proportionally to indoor model test. Through the model test and finite element simulation, the double row piles with two different connection structures of beam and plate are studied systematically and deeply, and it is concluded that which kind of connection structure has better comprehensive benefit. The main research results are as follows: (1) through indoor model test, the displacement of double-row pile supporting structure with beam and plate on the top of pile is analyzed and studied under the condition that the distance between front and rear piles is 4 days or 5 days or 6 days, respectively. Different variation of pile deformation and earth pressure distribution. The experimental results show that the accumulative variation values of the displacement of double-row piles in the form of beam-plate connection structure increase with the increase of excavation depth. The accumulative variation value of the displacement at the top of the double-row pile with plate connection structure is slightly smaller than that of the double-row pile structure with the beam connection structure, and the accumulative variation value of the pile top displacement of the two kinds of connection structure decreases with the increase of the distance between the two rows of piles. When excavated to the bottom elevation, the positive and negative moment values of the front row pile body are smaller than that of the plate connection structure, while the back row pile is opposite, the beam connection structure is larger than the plate connection structure. The bending moment of double row piles with two kinds of connection structures increases with the increase of the distance between the two rows of piles, and the earth pressure between the two rows of piles is influenced greatly by the piles, so the distribution law of the measured earth pressure is not good. The measured soil pressure between piles decreases with the increase of excavation depth. (2) combined with engineering example, the model test and excavation process of foundation pit on site are calculated and simulated by using large-scale finite element software ABAQUS and engineering example. By analyzing the different distribution of pile top displacement, pile bending moment and earth pressure between two kinds of double row piles supporting structure, the simulation results are basically consistent with the conclusion of indoor model test. The rationality of the results is verified by the analysis and comparison between the measured data and the numerical simulation results.
【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU473.1

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