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Back-analysis of monitoring results at Macquarie Park station, Epping to Chatswood rail line

机译：对Epping到车士活铁路的Macquarie Park站的监测结果进行回溯分析

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The design of the Epping to Chatswood Rail Line project was conducted nearly in parallel with the initial construction work. The Macquarie Park Station caverns were partially excavated while the design of the other three stations was still underway. This provided an opportunity to use as-constructed performance to refine the design parameters for the subsequent caverns. Geotechnical monitoring of the initial Macquarie Park Station excavation included inclinometers, extensometers, surface settlement points, endoscopes, convergence points, crown sag points and rock bolt load cells. The geology of the excavation faces was also carefully mapped. On the basis of the mapping, the geological model for this station was refined slightly. The monitoring results were reviewed and back-analysed. The rock mass moduli and the joint stiffness values of the different rock units were changed to "match" the monitored behaviour of the excavation. The back-analysis work generally indicated that the original models adopted for design were reasonable. Two "admissible" combinations of slightly revised geotechnical parameters were identified. Models for subsequent design of the other stations were adjusted to reflect the calibrated parameters. The back-analysis work was also consistent with the relatively high in situ stresses adopted for the project. This paper discusses the back-analysis work undertaken and demonstrates that appropriate monitoring is a useful tool for verifying and refining design models.
机译：Epping到Chatswood铁路项目的设计几乎与最初的施工工作并行进行。麦格理公园站的洞穴被部分挖掘，而其他三个站的设计仍在进行中。这提供了一个使用构造性能来完善后续洞室设计参数的机会。最初的麦格理公园站开挖的岩土工程监测包括测斜仪，引伸计，表面沉降点，内窥镜，会聚点，树冠下垂点和锚杆测力传感器。开挖面的地质也经过仔细绘制。在测绘的基础上，对该站的地质模型进行了细化。对监测结果进行了回顾和回溯分析。更改了不同岩石单元的岩体模量和节理刚度值，以“匹配”挖掘的监测行为。反向分析工作通常表明设计所采用的原始模型是合理的。确定了略微修改的岩土参数的两个“允许”组合。调整了其他站的后续设计模型，以反映已校准的参数。反向分析工作也与该项目采用的相对较高的原地应力一致。本文讨论了进行的反向分析工作，并证明适当的监视是验证和完善设计模型的有用工具。

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