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Open Access Issue
Study on Combined and Collaborative Design of Urban Transportation Hub and Surrounding Areas
Chinese Journal of Underground Space and Engineering 2023, 19(1): 22-31
Published: 01 February 2023
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The original comprehensive transportation facilities are difficult to meet the requirements of current development and the area positioning in the city because of the continuous urban construction and development, also the unceasing gathering of people. The solution is to relocate the old facilities into a large-scale comprehensive transportation hub integrating actively with the surrounding areas. This paper summarizes the experience of TOD development model in the planning and constructing the public rail transit stations, putting forward the problems existing in its application. Moreover, it considers people’s quality of life, puts forward the quality-of-life-oriented development (QOD concept) based on TOD model and explores its three characteristics. At the same time, taking Shenzhen Huangmugang hub as an example, this paper expounds on the integration of urban hub and area from four aspects: road-rail transit, slow system, hub modeling, and underground three-dimensional space, and the combination of dynamic and static area, explains the application of QOD concept in concrete design and provides a reference for the design and construction of similar urban hub complex and the coordinated development of hub and surrounding area.

Open Access Issue
Parameter back-analysis of hardening soil model for granite residual soil and its engineering applications
Rock and Soil Mechanics 2022, 43(4): 1061-1072
Published: 11 April 2022
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In recent years, construction works near the operating metro tunnel in granite residual soil have been gradually increasing, and the impact of these construction works on the safety of shield tunnel should not be ignored. Finite element method is an effective method to evaluate the influence of adjacent construction on shield tunnel, but its reliability highly depends on the reasonable selection of soil constitutive model and parameters. In this paper, the current situation of parameter selection of hardening soil model for granite residual soil is firstly reviewed. Then a back-analysis method for determining the parameters of granite residual soil based on the self-boring pressuremeter test (SBPMT) is proposed. Finally, the obtained back-analysis parameters are applied to the engineering case of foundation pit excavated overpass existing shield tunnel for method verification, and more reasonable values of parameters of hardening soil model for granite residual soil are determined. The results show that the strength parameters of hardening soil model for granite residual soil can be determined by laboratory tests, and the stiffness parameters of E50ref, Eoedref and Eurref are the key parameters for the back-analysis. The ratio of E50ref: Eoedref: Eurref from 1:1:3 to 1:1:5 is suitable for engineering practice, and the value of E50ref ranges from 36 MPa to 43 MPa according to different ratios.

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