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那马达—萨加(Narmada Sagar)坝位于印度中央邦那马达河上,是正在修建中的一座混凝土重力坝。坝顶长653米,最大坝高92米。本文论述坝基岩土力学勘察研究的成果,包括:岩体强度参数评价,现代岩石力学概念的应用,特别是坝基岩体分级,变形模量,剪切参数,强度和渗透性。观测节理系统,用以解释少数岩芯获得率差的区段,并说明钻探计划的孔位和方向。这提示:可由此估计渗水节理的间距和张开度,进而用以估量岩体中孔隙的可灌浆容积。为了作到优化灌浆,打斜孔是可取的。研究已经获得的各种参数值及其相关关系,得出如下结论:那马达—萨加坝坝基岩体是可胜任并适合于在建的混凝土重力坝。
The Narmada Sagar dam, located on the Namada River in Madhya Pradesh, India, is a concrete gravity dam under construction. The crest is 653 meters long and the maximum dam height is 92 meters. This paper discusses the research results of dam foundation geotechnical investigation, including the evaluation of rock mass strength parameters, the application of modern concepts of rock mechanics, especially the grading of rock mass, deformation modulus, shear modulus, strength and permeability of dam foundation. Observation joint system to explain the fraction of cores with poor core yields and to illustrate the hole locations and orientations of the drilling program. This suggests that the pitch and opening of seepage joints can be estimated to estimate the groutable volume of pores in rock mass. In order to be optimized for grouting, slanting holes are desirable. Studying the various parameter values that have been obtained and their correlations leads to the following conclusion: The Namada-Saga dam foundation rock mass is a concrete gravity dam that is competent and suitable for under construction.