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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Sprayed concrete for underground excavations - a status report
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Sprayed concrete for underground excavations - a status report

机译：用于地下挖掘的喷射混凝土-状态报告

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摘要

Commencement of the next phase of the Lesotho Highlands Water Project is a year or so away from becoming reality. Some 50 km of tunnels in the form of access adits, shafts, diversion tunnels, and main waterways will be constructed. Sprayed concrete will form an integral part of the temporary and permanent rock support systems that will be installed. Furthermore, the use of sprayed concrete as a final tunnel lining solution was proposed as a viable alternative to concrete linings in the feasibility studies that preceded the forthcoming implementation phase.The aim of this paper is to make the reader aware of all the sprayed concrete related issues that engineers tend to grapple with during the design and construction of tunnel projects and other underground works. Primarily, these issues would include selection of applicable design parameters, technical specifications, construction application methods, quality control and, most importantly in the context of final or permanent linings, the durability of sprayed concrete.The International Tunnelling Association (ITA) Working Group (WG) 12 has been tasked specifically to publish a set of recommendations on the Quality and Control of the Application of Sprayed Concrete and the Testing of Sprayed Concrete for Durability. These tasks were also further explored at the recent World Tunnel Congress (WTC 2015) that was held in Dubrovnik, Croatia at the end of May 2015.
机译：莱索托高地水项目下一阶段的启动距离现实还差一年左右。将建造约50公里的通道，包括进场通道，竖井，引水隧洞和主要水道。喷射混凝土将成为将要安装的临时和永久性岩石支撑系统的组成部分。此外，在即将到来的实施阶段之前的可行性研究中，有人提出将喷射混凝土用作最终的隧道衬砌解决方案，作为混凝土衬砌的可行替代方案。本文旨在使读者了解所有与喷射混凝土相关的知识在隧道项目和其他地下工程的设计和施工过程中，工程师往往会处理的问题。首先，这些问题包括选择适用的设计参数，技术规格，施工应用方法，质量控制，最重要的是在最终衬砌或永久衬砌的情况下，喷射混凝土的耐久性。国际隧道协会（ITA）工作组（ WG）12的任务是专门发布一套有关喷涂混凝土施工的质量和控制以及耐久性测试的建议。在2015年5月底在克罗地亚杜布罗夫尼克举行的世界隧道大会（WTC 2015）上，也进一步探讨了这些任务。

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