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首页> 外文期刊>Australian Geomechanics >THE USE OF EARLY-WORKS EMBANKMENTS IN SOFT SOIL AREAS TO OPTIMISE DETAILED DESIGN: GATEWAY MOTORWAY CASE STUDY
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THE USE OF EARLY-WORKS EMBANKMENTS IN SOFT SOIL AREAS TO OPTIMISE DETAILED DESIGN: GATEWAY MOTORWAY CASE STUDY

机译：使用早期工程堤防在软土地区优化详细设计：网关高速公路案例研究

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This paper presents a case study on the use of early-works preload embankments in soft soils areas to provide information to optimise detailed design. The Gateway Upgrade North (GUN) project involved the widening of the existing Gateway motorway from four to six lanes with some areas of re-alignment. Early-works for the motorway upgrade involved construction of sections of embankment located in areas of soft soils. From a geotechnical perspective, the early-works were essentially instrumented trial embankments constructed 9 to 12 months ahead of the main package and therefore provided an opportunity to observe embankment and wick drain performance and back-analyse soft soil consolidation parameters used for the detailed design for the final motorway construction.Data from settlement plates, vibrating wire piezometers and inclinometers was used in conjunction with site investigation and laboratory data to assess consolidation parameters of highly compressible Holocene-age alluvial clays. Asaoka's method and Terzaghi's theory of one-dimensional consolidation were used in the back analysis of primary consolidation parameters. Secondary settlement was also observed allowing back analysis of secondary compression parameters. Using consolidation parameters derived from the back analysis, design parameters were allocated to relevant geological units which were then applied in settlement modelling for critical sections in the detailed design.Assessment of the early-works embankment monitoring data enabled a more robust prediction of embankment behaviour during and post-construction. This resulted in a more cost-effective and optimised embankment design with higher confidence in predicted post-construction settlements.The term preloading is used in this paper to refer to both 'preloading' and 'surcharging'. The former is the application of a temporary load, usually via fill, equivalent to the future fill plus in-service load, for inducing a substantial fraction of the expected settlement prior to construction. The latter refers to applying extra load to enhance preloading.
机译：本文提出了一种案例研究软土地区在软土壤中使用早期工程预载堤，提供了优化详细设计的信息。网关升级北（枪）项目涉及从四到六个车道的现有网关高速公路扩大，其中一些重新对齐。高速公路升级的早期作品涉及位于软土地的堤防部分的建设。从岩土角度来看，早期作品基本上是仪器的试验堤，在主要套餐之前建造了9至12个月，因此提供了一个用于观察路堤和芯漏性能的机会，并进行了用于详细设计的后分析软土固结参数来自沉降板的最终高速公路建筑，振动线压力计和倾角仪与现场调查和实验室数据结合使用，以评估高可压缩全茂年龄冲积粘土的固结参数。 Asaoka的方法和Terzaghi的一维固结理论用于初级固结参数的后分析。还观察到次要沉降，允许反对分析二次压缩参数。使用从后部分析导出的整合参数，将设计参数分配给相关地质单元，然后在详细设计中为关键部分应用于结算建模。早期工程路堤监控数据的评估使得在堤防行为中的更强预测和后建设。这导致更具成本效益和优化的路堤设计，对预测后建设后的定居点具有更高的信心。本文使用术语预加载，以指“预加载”和“收费”。前者是临时负荷的应用，通常通过填充，相当于未来填充加上的服务载荷，用于在施工之前诱导大部分预期沉降。后者是指施加额外的负载以增强预加载。

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