本文關鍵詞： 基坑 有限寬度土體 地鐵車站 立柱樁 橫墻 數(shù)值分析　出處：《上海交通大學學報》2016年11期 　論文類型：期刊論文

【摘要】：基于摩爾庫倫彈塑性本構(gòu),提出了考慮土體小應變剛度特征的數(shù)值分析方法,并在有限差分軟件FLAC3D中實現(xiàn)二次開發(fā).將提出的數(shù)值方法用于模擬某基坑的施工過程,該基坑鄰近既有地鐵車站,且坑內(nèi)外分別存在橫墻和立柱樁.將數(shù)值計算結(jié)果與實測數(shù)據(jù)進行對比,驗證所提出的數(shù)值方法的有效性.進一步對比分析了有無立柱樁和坑內(nèi)橫墻時圍護墻的變形特性.研究表明,由于基坑與車站間的土體寬度大于臨界寬度值,其圍護墻變形不受鄰近車站地下結(jié)構(gòu)的影響;立柱樁的存在能夠減小主動區(qū)土壓力,坑內(nèi)橫墻增加了被動區(qū)的抗力,使得圍護墻變形明顯減小.
[Abstract]:Based on Moore Coulomb elastoplastic constitutive equation, a numerical analysis method considering the characteristics of small strain stiffness of soil is proposed, and the secondary development is realized in the finite difference software FLAC3D. The numerical method is used to simulate the construction process of a foundation pit. The foundation pit is adjacent to the existing subway station, and there are transverse walls and vertical piles inside and outside the pit. The numerical results are compared with the measured data. The effectiveness of the proposed numerical method is verified. Furthermore, the deformation characteristics of the retaining wall with or without the vertical column pile and the transverse wall in the pit are compared and analyzed. The results show that the soil width between the foundation pit and the station is larger than the critical width. The deformation of the retaining wall is not affected by the underground structure of the adjacent station, the existence of the column pile can reduce the earth pressure in the active zone, the resistance of the passive zone is increased by the transverse wall in the pit, and the deformation of the retaining wall is obviously reduced.
【作者單位】： 山東省建筑科學研究院;泰安市工程質(zhì)量檢測中心;
【分類號】：TU753

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