研究目的:结合南京梅子洲青奥城地下空间依托工程及其现场监测数据,对目前在超深基坑支护中正逐渐得到推广应用的变刚度地下连续墙的二维和三维合理计算方法、计算参数选取及其受力变形机理与特性进行探讨和分析,以期指导该项目的设计施工,并为未来的类似工程提供一定的参考和借鉴价值。
研究结论:（1)可以参考双排桩的荷载模式建立变刚度地连墙的荷载-结构计算模型,并对其进行较好的受力变形分析;（2)计算结果表明,变刚度地连墙的水平位移大约只有单排地连墙的1/3，充分显示了其控制变形能力强的特点；（3)单排地连墙具有侧向刚度小、墙体应力大、受力不均匀等缺点，而变刚度地连墙可以有效地克服上述缺点；（4)本研究结果对类似的工程分析与计算具有参考价值。
Research purposes: Based on the Underground Space Construction Project of Nanjing Meizizhou Qingao City and its field monitoring data， the two - dimensional and three - dimensional computational methods， computation parameters and bearing and deforming behaviour of variable stiffness diaphragm wall，which is gradually promoted and used as a retaining structure in ultra - deep foundation pit， have been discussed and analyzed in this paper. The research results may guide the design and construction of the above mentioned project and provide good reference value for similar engineering analyses in the future.
Research conclusions :(1) The computational model of variable stiffness diaphragm wall could be built based on the double - row pile load mode， and the analyses of bearing capacity and deformation property for the variable stiffness diaphragm wall could be carried out. (2) Computational results indicate that the lateral displacement of variable stiffness diaphragm wall is only 1/3 of that for the single - row diaphragm wall. (3) The single - row diaphragm wall has many shortcomings，such as low lateral stiffness， high and unevenly distributed stress in the wall body， but the variable stiffness diaphragm wall can effectively overcome these shortcomings. (4) The research results show the validity and rationality of the proposed method in this paper， which may provide good reference value for similar engineering analyses.
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