摘要
CSG技术是一种新型的碾压混凝土筑坝技术,这种技术的核心是使用一种被称为CSG(胶结砂砾石)的廉价筑坝材料。CSG是在坝址附近易于得到的河床砂砾石或开挖弃渣等材料中加入少量水泥,经简单拌和后振捣碾压而获得的一种材料,可以看作是一种贫碾压混凝土。CSG坝的基本剖面为对称梯形,由于梯形的CSG坝应力较小,对筑坝材料强度的要求也比较低,虽然CSG的强度低于混凝土,也能够满足筑坝的要求。CSG坝经实践证明在安全、工期、造价和环保等方面具有很大的优势,在欧洲和日本正受到越来越多的关注。作为CSG坝在中国的初次实践,介绍了道塘大坝上游CSG围堰的设计、施工和结构计算,阐述了CSG坝的技术特点以及CSG技术在围堰等临时工程中的优势。通过材料试验和现场碾压试验,获得了许多宝贵的试验数据和CSG坝施工的技术参数,为CSG技术在中国的应用积累了经验。
CSG method is a new technique proposed for RCC, the centre of this technique is the application of C,SCG （cement sand and gravel） for dam construction. CSG is a material made by adding a little amount of cement in rock-like materials such as riverbed gravel or excavation muck that can be obtained easily near dam sites, and mixing briefly and rolling with vibration rollers, which can be considered as a lean RCC. CSG dam is a symmetrical trapezoid-shaped dam, the strength of CSG is relatively not stronger compared with concrete. On the other hand, because the stress occurred in a symmetrical trapezold-shaped dam is small, the required strength of its material can be low. Therefore, CSG can be used to construct a trapezoid-shaped dam. It is proved by practice that CSG dam has such advantages as greater safety, short construction period, low construction costs and better environment protection, so it is attracting much more attention in Europe and Japan currently. The design, construction and structural analysis for the CSG cofferdam in the upper course of Daotang dam, as the practice of CSG dam for the first time in China, are introduced here, and the characteristics of CSG method and the advantages of the method applying in temporary structures such as cofferdam and so on are clarified. Based on the results of material tests and site rolling experiments, the characteristics of CSG material and some useful technical parameters of CSG method are gotten. All these could provide experiences for the application of CSG method in China.
出处
《水利与建筑工程学报》
2008年第2期15-18,共4页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金资助项目(50679058)
关键词
CSG技术
围堰
试验研究
新技术
RCC
CSG method
cofferdam
experimental research
new technology
RCC
