為探究長條形深基坑在敏感環境下采取何種內支撐布置型式可以保證緊鄰既有建筑及基坑的安全和穩定，以河北省人民醫院心腦血管綜合樓基坑工程為背景，利用Midas GTS NX 對基坑進行考慮土-結相互作用的三維上下協同分析，對比了對撐+角撐型、角撐型、雙圓形環梁型及橢圓形環梁型內支撐支護下的周邊建筑變形、護坡樁深層水平位移以及基底隆起等控制指標，并且與監測報警值以及現場監測數據進行了對比。結果表明：對撐+角撐型式內支撐較其它類型更為適用；內支撐布置型式對基底隆起的變化形態有顯著影響，但對于基底隆起量的影響較??；角撐型和雙圓形環梁型內支撐在使用時建議增加薄弱點處的剛度。所提對撐+角撐型式內支撐既能保證基坑的安全又能較好地控制緊鄰既有建筑的變形,對類似工程的設計、施工和變形控制有一定的參考價值。
In order to explore what kind of internal support layout can ensure the safety and stability of adjacent existing buildings and long strip deep foundation pit under sensitive environment, taking the actual project as the background, Midas GTS NX is used to analyze the three-dimensional interaction of soil and structure in foundation pit, the deformation control indexes of the building and foundation pit under various types of internal support are compared, and compared with the monitoring alarm value and field monitoring data. The results showed that: internal support of opposite brace and angle brace type is more suitable than other types; the layout of the inner support has a significant effect on the change of the basement uplift, but has little effect on the amount of the uplift; it is suggested to increase the stiffness at the weak point when using the corner brace type and the double circular ring beam type inner support. The proposed internal bracing can not only ensure the safety of foundation pit, but also better control the deformation of adjacent existing buildings, which has certain reference value for the design, construction and deformation control of similar projects.