Braced excavations: what about the corners?
支撑挖掘:拐角处怎么样?
基本信息
- 批准号:EP/X024849/1
- 负责人:
- 金额:$ 59.98万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2023
- 资助国家:英国
- 起止时间:2023 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
When a new metro station or a deep basement are to be constructed in a city, a large hole in the ground is needed. The hole needs to be safe to work in and to allow access and very often the chosen solution is to support the sides of the large hole with a braced embedded retaining wall. These are substantial pieces of temporary works of considerable cost. Recent examples are the 230 long by 24 m wide by 23m deep excavation for the new Crossrail station at Paddington in London. An important feature of this form of construction is large props that span between the walls, to hold them up. For those tasked with designing the prop size, location, number and the walls the key issues are prediction of ground movements adjacent to the excavation (which could negatively affect buildings) and propping forces (so that the right props can be used and while guidance exists for designers in some recent publications produced by the UK construction information organisation, CIRIA, coverage of the behaviour at excavation corners as regards both design issues is poor. There is substantial published research on the computational modelling of braced excavations but only in two-dimensions (i.e. s slice through a long wall), some of it validated against field data, however accounting for 3D effects as required for the analysis of corners is rare and insubstantial. Improving our understanding of the behaviour of these corners and how it is affected by soil behaviour, system stiffness, and prop loading will lead to (a) greater economy in propping schemes and (b) more certainty in the prediction of ground movements adjacent to corners, potentially reducing the accommodation works required to prevent damage to adjacent structures. The programme of research proposed here comprises complex computational simulations of the construction of a braced excavation, taking into account differences in geometry, materials and sequences. The problem can only be properly tackled using a 3D model (unlike many other problems in geotechnical engineering) however even today, the computational tools we use struggle to deliver results quickly when we try to model in 3D. So, in this proposal we will be using a clever method where "reduced order models", (ROMs) will be made, using results from a relatively small set of the complex 3D models. A ROM is much easier to use and is generated by manipulation of a limited number of the high fidelity 3D simulations. From these ROMs we will derive results and prepare guidance for engineers designing braced excavations which will enable cheaper and simpler schemes to be used.The researchers on the project come from Durham and Dundee Universities and are supported by a Project Oversight Group comprising key figures from the UK industry.
当城市要建造新的地铁站或深层地下室时,需要在地面上挖一个大洞。该孔需要安全工作并允许进入,通常选择的解决方案是用支撑的嵌入式挡土墙支撑大孔的侧面。这些都是大量的临时工程,成本相当高。最近的例子是伦敦帕丁顿新横贯铁路车站的 230 长、24 m 宽、23 m 深的挖掘。这种建筑形式的一个重要特征是跨越墙壁之间的大型支柱,以支撑墙壁。对于那些负责设计支柱尺寸、位置、数量和墙壁的人来说,关键问题是预测挖掘附近的地面运动(这可能会对建筑物产生负面影响)和支撑力(以便可以使用正确的支柱,同时存在指导)对于设计师来说,英国建筑信息组织 CIRIA 最近出版的一些出版物中,关于这两个设计问题的开挖角行为的报道很少,关于支撑开挖的计算模型的研究很少。二维(即穿过长墙的切片),其中一些根据现场数据进行了验证,但是根据角点分析所需的 3D 效应的解释很少且不足以提高我们对这些角点行为及其作用方式的理解。受土壤行为、系统刚度和支撑载荷的影响,将导致 (a) 支撑方案更加经济,(b) 拐角附近地面运动的预测更加确定,可能减少防止损坏所需的调节工程到邻近的结构。这里提出的研究计划包括对支撑挖掘施工的复杂计算模拟,同时考虑到几何形状、材料和序列的差异。这个问题只能使用 3D 模型才能正确解决(与岩土工程中的许多其他问题不同),但即使在今天,当我们尝试进行 3D 建模时,我们使用的计算工具也很难快速提供结果。因此,在本提案中,我们将使用一种巧妙的方法,使用来自相对较小的一组复杂 3D 模型的结果来制作“降阶模型”(ROM)。 ROM 更容易使用,并且是通过操作有限数量的高保真 3D 模拟来生成的。从这些 ROM 中,我们将得出结果,并为设计支撑挖掘的工程师准备指导,这将使使用更便宜和更简单的方案成为可能。该项目的研究人员来自杜伦大学和邓迪大学,并得到项目监督小组的支持,该小组由来自英国工业。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Charles Augarde其他文献
Fracture modeling using meshless methods and level sets in 3D: Framework and modeling
使用无网格方法和 3D 水平集进行断裂建模:框架和建模
- DOI:
10.1002/nme.4365 - 发表时间:
2012 - 期刊:
- 影响因子:2.9
- 作者:
Xiaoying Zhuang;Charles Augarde;Kjell Mathisen - 通讯作者:
Kjell Mathisen
Charles Augarde的其他文献
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{{ truncateString('Charles Augarde', 18)}}的其他基金
Seabed ploughing: modelling for infrastructure installation
海底犁耕:基础设施安装建模
- 批准号:
EP/M000397/1 - 财政年份:2014
- 资助金额:
$ 59.98万 - 项目类别:
Research Grant
Sub-micron X-ray Computed Tomography Facility at Durham University - non-equipment part
杜伦大学亚微米 X 射线计算机断层扫描设备 - 非设备部分
- 批准号:
EP/K036084/1 - 财政年份:2013
- 资助金额:
$ 59.98万 - 项目类别:
Research Grant
Finite deformation geomechanics: developing a meshless scaled boundary method
有限变形地质力学:开发无网格尺度边界方法
- 批准号:
EP/D077117/1 - 财政年份:2007
- 资助金额:
$ 59.98万 - 项目类别:
Research Grant
Unsaturated soil geotechnics / linking with China
非饱和土岩土工程/与中国接轨
- 批准号:
EP/D038782/1 - 财政年份:2006
- 资助金额:
$ 59.98万 - 项目类别:
Research Grant
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