关键词: 安全风险, 风险分析, 分级管控, 风险矩阵, WBS, 胶凝砂砾石

Abstract: To solve the problem about hierarchical risk management during the construction of cement sand and gravel dams, taking Xijiang reservoir in Leishan county, which is currently under construction, as an example, based on work area, minimum assessment unit and safety risk point, the work breakdown structure (WBS) method is used to divide the closely related work of cement sand and gravel into three levels. And the risk matrix method is used to evaluate the safety risk points, which are divided into four grades including Ⅰ, Ⅱ, Ⅲ and Ⅳ based on the possibility and severity of safety risks. This research result is not only applicable to the risk assessment and classification of safety risk points of closely related work of cement sand and gravel, but also can identify and analyze the potential hazards and harmful factors, and divide assessment units, which provides reference for the safety risk analysis and hierarchical risk management of similar water conservancy projects.

Key words: safety risk, risk analysis, hierarchical risk management, risk matrix, WBS, cement sand and gravel