【摘要】：在多層多種地下結構相互作用的復雜環(huán)境中,新建隧道施工侵入到地下街群樁基礎的內(nèi)部,具有較高的工程風險。通過數(shù)值模擬與現(xiàn)場實測,重點研究新建隧道侵入過程對地下街樁位移與內(nèi)力的影響。結果表明:開挖正洞下部會使與導洞初襯底板相交處的樁段彎矩急劇增大;截樁后,置于正洞上拱部襯砌中的殘留樁段軸力明顯減小,而襯砌的最小主應力明顯增大;與不存在地鐵隧道時相比,附近存在地鐵隧道時的新建隧道施工引起的地下街樁基沉降會減小,應考慮第三方地下結構的作用。該研究結論可為新建隧道穿越復雜地下結構體系的災害預防提供參考。
[Abstract]:In the complex environment of multi-story and multi-underground structure interaction, the construction of new tunnel invades the interior of pile group foundation of underground street, which has high engineering risk. Through numerical simulation and field measurement, the influence of new tunnel invasion process on displacement and internal force of pile in underground street is studied. The results show that the bending moment of the pile segment at the intersection of the initial substrate plate of the pilot tunnel will be increased sharply by excavation of the lower part of the main tunnel, and the axial force of the residual pile segment placed in the arch lining of the main tunnel will obviously decrease, and the minimum principal stress of the lining will increase obviously after the pile is cut off. Compared with those without subway tunnel, the settlement of pile foundation of underground street caused by the construction of new tunnel in the vicinity of subway tunnel will be reduced, so the effect of the third party underground structure should be considered. The conclusion can be used as a reference for disaster prevention of new tunnel crossing complex underground structure system.
【作者單位】： 湖南科技大學土木工程學院;中南大學土木工程學院;中鐵十五局集團有限公司;
【基金】：中鐵第四勘察設計院集團有限公司科技研究開發(fā)計劃項目(2013K48)資助
【分類號】：TU473.1;U456.3

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