SL 228-98 Concrete Face Rockfill Dam Design Code

Author: None
Publisher: China Water Conservancy and Hydropower Press
Publication Date: 2003-05-01
Features: According to the technical standard formulation and revision plan issued by the Ministry of Water Resources in 1997, this code was formulated based on the Design Guidelines for Concrete Face Rockfill Dams (DL5016—93) (hereinafter referred to as the original guidelines), incorporating domestic and international construction experience and scientific research achievements over the past ten years. The original guidelines were modified and supplemented to create this code. The main content of this code includes: the layout of concrete face rockfill dams and related spillway and water release structures; detailed zoning of rockfill or gravel material in the dam body; material properties and filling quality standards of the dam body; dam body design and calculations; excavation and treatment of dam foundation and bank slopes; design of concrete toe slab and face slab; waterstop design for various joints such as peripheral joints and vertical joints; phased construction and heightening of existing dams; and basic requirements and specifications for prototype observation layout design. The main modifications and supplements to the original guidelines are as follows:
1. The scope of application was revised to be applicable to the design of concrete face rockfill dams with dam heights of 70 meters or more and classified as Class 1, 2, 3, or lower.
2. A chapter on terms and symbols was added to standardize graphical notations.
3. The original guidelines' provisions that high concrete face rockfill dams should not be constructed on gravelly foundation were revised.
4. The use of excavation materials from the project complex, as well as stones or gravel materials from the vicinity of the dam, was emphasized to improve technical and economic effects.
5. The requirements for toe slab foundation were broadened. In addition to weakly weathered rock layers, after specialized justification and engineering measures, it can also be built on weathered fractured or soft bedrock. Basic requirements for adopting concrete cutoff walls and placing toe slabs on gravelly layers were also proposed.
6. Basic requirements for stability analysis and finite element method calculations for dam body stress and deformation were supplemented.
7. Requirements for dam crest structure design, seismic measures for the dam body, and seepage control for gravelly dam bodies were added.
8. Standards for determining the thickness of concrete face slabs, technical specifications for raw materials and mix proportions, and crack prevention measures and requirements for face slabs were supplemented. Waterstop design for peripheral joints was appropriately simplified, and requirements were broadened.
9. General observation items were simplified, and optional observation items were added.
Interpretive Unit of this Code: General Institute of Water Conservancy and Hydropower Planning and Design, Ministry of Water Resources
Main Formulating Unit of this Code: General Institute of Water Conservancy and Hydropower Planning and Design, Ministry of Water Resources
Main Drafters of this Code: Zhao Zengkai, Jiang Guoceng, Cao Keming, Yang Defu, Yang Shiyuan, Wang Zhiming