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首页> 外文期刊>Soils and foundations >SEVERAL GEOTECHNICAL DESIGN AND CONSTRUCTION ISSUES WITH AKASHI STRAIT BRIDGE
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SEVERAL GEOTECHNICAL DESIGN AND CONSTRUCTION ISSUES WITH AKASHI STRAIT BRIDGE

机译：赤石海峡大桥的几个岩土工程设计和施工问题

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The Akashi Kaikyo (Strait) Bridge, one of the major bridges of the Honshu-Shikoku bridge network connecting the main island and the Shikoku island, is the world's longest suspension bridge with a center span of about 2,000 m. The bridge was constructed over the Akashi Strait and opened to traffic in 1998 after a construction period of about 10 years. The granite stratum in the Akashi Strait was very deep, while the granite stratum provides the foundations for the other long span bridges which have been constructed in Japan. Three of the four foundations had to be constructed on either a weakly cemented gravelly soil deposit or a sedimentary soft rock layer. The geological structure was carefully investigated and the geotechnical properties, in particular the strength and deformation characteristics of these geo-material types, were carefully evaluated. To this end, a comprehensive series of advanced triaxial compression (TC) tests were performed on rotary core tube samples of sedimentary soft rock after it was found that the due design was not possible based on unconfined compression tests. Both CD and CU TC tests and cyclic undrained triaxial tests were performed on rotary core tube samples (30 cm in dia.) of the gravelly soil. Based on the data, the long-term and seismic stabilities of the foundations were evaluated. The importance of strain- and pressure-dependent nonlinear stress-strain behaviour at small strains, as well as accurate strain measurements in the laboratory stress-strain tests, was confirmed by analyzing the full-scale behaviour of the foundation during and after construction and comparing the back-calculated stiffness values with those obtained from laboratory stress-strain tests, pressure-meter tests, plate loading tests and field shear wave velocity measurements.
机译：明石海峡大桥是连接本岛和四国岛的本州-四国桥梁网络的主要桥梁之一，是世界上最长的悬索桥，其中心跨度约为2,000 m。这座桥是在明石海峡上建造的，经过大约10年的建设期，于1998年通车。明石海峡的花岗岩地层很深，而花岗岩地层则为日本建造的其他大跨度桥梁奠定了基础。四个基础中的三个必须在水泥质较弱的砾石土沉积物或软岩沉积层上构建。仔细研究了地质结构，并仔细评估了岩土特性，特别是这些岩土类型的强度和变形特性。为此，在发现基于无边压缩试验的合理设计是不可能的之后，对沉积软岩的旋转岩心管样品进行了一系列全面的高级三轴压缩（TC）试验。 CD和CU TC测试以及循环不排水三轴测试都是在砾石土壤的旋转芯管样品（直径30厘米）上进行的。根据这些数据，评估了基础的长期稳定性和地震稳定性。通过分析基础在施工过程中和施工后的满量程行为并进行比较，证实了小应变下与应变和压力有关的非线性应力-应变行为以及实验室应力-应变测试中准确应变测量的重要性。反向计算的刚度值，包括从实验室应力应变测试，压力计测试，板载荷测试和场剪切波速度测量获得的刚度值。

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