Abstract: Arching effect of core wall is an important issue in design of core wall rockfill dam, which causes significant influence on deformation and hydraulic fracture characteristics of the core wall. Based on field test results of Nuozadu dam materials, laboratory test study was carried out on the field materials. Then, model parameters of the dam materials were determined according to test results. Followed, deformation, stress, hydraulic fracture characteristics of the dam and core wall were investigated by FEM calculations, and some suggestions were proposed for design and construction of the dam.

Key words: Nuozadu core wall rockfill dam, arching effect, compaction characteristic, hydraulic fracture

摘要： 心墙拱效应是心墙堆石坝设计中需关注的重点问题之一，拱效应对心墙的应力变形及抗水力劈裂特性影响较大。在对糯扎渡高心墙堆石坝的坝料现场检测成果进行分析的基础上，对现场填筑坝料的工程特性进行了室内试验研究，根据试验成果拟定了心墙料与堆石料模量差别较大的计算参数，据此进行了大坝应力变形有限元计算，对心墙的变形、应力、抗水力劈裂安全性进行了深入分析，根据研究成果提出了对大坝设计及施工方面的建议。

关键词: 糯扎渡心墙堆石坝, 拱效应, 压实特性, 水力劈裂