盾构隧道施工对西安钟楼影响的数值模拟预测.pdf

ÓcI|: 1673null0291( 2011) 04null0033null05â¡@ý½ÒL•Y¥”´Eç©王文斌,刘维宁,丁德云,李克飞(ØŒYvÐr!yýýñÐý,Ø100044)Knull1:隧道施工导致古建筑及周围地表沉降的预测和控制是国内隧道工程领域遇到的研究课题之一.建立的三维有限元模型模拟了西安地铁2号线钟楼段的盾构施工过程,模拟了无隔离桩a无接触隔离桩及有接触隔离桩3种情况下盾构掘进过程中地面点沉降a钟楼周围地表和钟楼台四角点沉降的动态变化规律.结果表明,盾构施工有限元模型可以很好的模拟盾构通过的各个阶段,计算结果与盾构掘进规律一致;有接触隔离桩模型较好地反映了隔离桩的实际工程作用,有效的隔断了桩内外的地表沉降,隔离桩内外地表沉降差达到14null1 mm;接触隔离桩减小了盾构施工引起的钟楼四角点的沉降及差异沉降,对钟楼起到了很好的保护作用.1oM:盾构施工;隧道施工;古建筑;地表沉降;有限元Ïms Ë|: U455null1 null null nullÓDS½’: ADiscussion on risk management in urban subway projectsWANG Wenbin, LI U Weining, DING Deyun, LI Kef ei( School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)Abstract:Forecasting and controlling of the surface settlement close to the ancient buildings in the tunnullneling construction is one of the important research issues in the tunnel engineering in China. 3D finiteelement models are established to stimulate the process of shield tunneling of Xinull an bell tower. U nderthree conditions of ( 1) without isolating piles, ( 2) isolating piles without contact, and ( 3) isolatingpiles with contact, this paper studied the dynamic discipline of ground settlement, settlement and difnullference settlement of Xinull an bell tower and the bell tower foursquare points, T he results indicate thatthe finite element model could simulate each stages of shield tunneling, and the result is consistent withthe discipline of measure data. The isolating piles model with contact reflects the practical function ofproject better, which can prevent the surface settlement effectively. The settlement difference betweenthe interior and exterior part of the pile is 14null1 mm. The isolating piles can reduce the foursquarepointnull s settlement ( caused by construction) of the bell tower and the bell tower can be well protected.Key words:shield construction; tunnel construction; ancient building; surface settlement; finite elenullmentnull nulllà°ù: 2009null02null18;©è°ù: 2011null04null20Á[":½¹M=|L@ýЏÒL•Ys["'ù( KCL08010530)T€eº:¦Ó\( 1982null ) ,3,öê62¦,pV3,ö1VY¹/ýñ@ýùî. email: 07115273@ mail. bjtu. edu. cn.null nulláS åN«ò,¸ÓÄì¥WÙ,Û"ìgE¡ŒYY³'Ê34nullØnullŒnullYnullvnullÐnullÐnullnull null null null null null null null null null null null null null null»35 |,rª¥þ Ø ïЕ”|´ÂV1îU.m2 nullØ»µKí˜mFig. 2 null 3nullD FEM modelV1nullrª¥þ Ø ïЕ”Tab. 1null Physic mechanical parameters of soil layersrª¨/ mâê/ kPa¸×/ ( kN/ m3)* ï/ kPa= ˆ˜/ (null){¾1¨¥'1"ÍAr8null6 9100 16null5 10 10 0null35 D- PÛr3null5 8100 19 15 20 0null32 D- PºÛr8null35 11000 20null1 15 25 0null3 D- PxÉ*r18 14300 20null4 15 25 0null3 D- PLû8null5 9000 16null6 - - 0null3Ÿ2null2 null@ýVñE 7‹Vñ¹:5 7‹·L,·L 7‹›8ª 7‹PL, 7‹Z_Âm2ÏphîU.°åD = 6 m,P·L 7‹¨1null5 m (0null25D)¥ 7‹É,P·â¡òs60„ 7‹.@ýVñs¹žr-¥*⠔fa— 7‹aé½ÐÁA ÿ}3ñ¨,µKíELC„ç¹:»B„:¥wÉVñÏ,¹Ü™râï,1 7‹ëóÍ 7‹r8Bç¥râ ï,[]¸ 7‹ë¹VCH/æ.»=„:Ä 7‹â¡r8„â¡“ªW#r,W#r¨ “Á TW#„ T¨­„,Ñ T†í.»Ø„:Ä»=„¥Ñ T†í,M‹ÊÂ¥
`r5ˆí,5Ë“¶¥W#r†íi¨ÿ}†í‹Ÿ}9ðW#r‹Ÿ,EYV#Áÿ}Vñ.3 nullE²TsØ»µKí˜ÏëVÒLφ˜_,V,ÒLû4ñ“˜Ä¿YV¥5ª¨½
¹AaBaC„D˜Ä,·§â¡ÏZ¥¹ëÄnm3.3null1 nullYVVñϹëÄ憷§â¡ÏZ¹ëÄ !ÉVñÏ¥æ†MÄwLÂm4îU.m3null²TsSÿmFig. 3 null Analysis markm4null·â¡ÏZ¹ëÄæ†MÄwLFig. 4null Ground settlement at the top of right tunnel centerV[ A, 3Õf ƒ/·§â¡ÏZ¹ëÄ¥æ†wL'BÁ,æ†sƒïQS˜.˜null¥æ†´Kl,ö1^y¹
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