Xác định độ tin cậy yêu cầu khi nâng cấp sửa chữa hệ thống đầu mối hồ chứa nước theo lý thuyết độ tin cậy và phân tích rủi ro

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Tác giả: Xuân Khâm Lê, Lan Hương Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Kỹ thuật Thủy lợi và Môi trường, 2022

Mô tả vật lý: tr.130

Bộ sưu tập: Báo, Tạp chí

ID: 331616

Thêm vào giỏ Liên kết toàn văn

Các đầu mối hồ chứa được xây dựng trong nhiều thời kỳ khác nhau nên nhiều hồ đập chưa đáp ứng đầy đủ các yêu cầu về: tài liệu thiết kế, phương pháp thiết kế, kỹ thuật thi công và công tác duy tu bảo dưỡng, bảo trì hệ thống, nên mức độ an toàn của các công trình đầu mối thường thấp hơn so với các quy chuẩn, tiêu chuẩn hiện tại và đã có nhiều hồ đập bị hư hỏng sự cố cũng như tiềm ẩn các nguy cơ gây mất an toàn hồ chứa. Nếu hệ thống xảy ra sự cố vỡ đập sẽ gây ngập lụt và thiệt hại lớn về người và tài sản cho vùng hạ du, nên việc nâng cấp sửa chữa hồ đập kết hợp với nâng cao năng lực quản lý an toàn đập, hồ chứa thủy lợi là rất quan trọng. Hiện nay, việc nâng cấp sửa chữa các công trình đầu mối hồ chứa nước được tính theo phương pháp tất định đã đáp ứng được các yêu cầu về kinh tế kỹ thuật nhưng lại chưa có nhiều mối liên hệ định lượng với rủi ro ngập lụt của vùng hạ du. Do đó, để các quyết định lựa chọn phương án nâng cấp sửa chữa hệ thống đạt hiệu quả cao và đảm bảo độ tin cậy yêu cầu theo mức rủi ro chấp nhận được của vùng hạ du, nghiên cứu giới thiệu cách chọn phương án tối ưu khi nâng cấp công trình đầu mối hồ chứa theo lý thuyết độ tin cậy và phân tích rủi ro. Ứng dụng các kết quả tính toán để chọn phương án nâng cấp hệ thống đầu mối hồ chứa nước Cam Ranh tỉnh Khánh Hòa đáp ứng theo tiêu chuẩn phòng lũ của ICOLD và thiết kế tràn bổ sung theo độ tin cậy yêu cầu.Headworks of reservoirs were constructed in different periods, so many dams have not fully met the requirements for: design documents, design methods, construction techniques and maintenance work of the construction system. Therefore, the safety level of works is often lower than the current regulations and standards, and many dams have failed as well as potential risks of unsafety of the reservoir. If earth dams are broken, it will cause flooding and great loss of life and property to the downstream area, sothe upgrading and repair of headworks of reservoirs in combination with improving the capacity of dam safety management should be improved. Currently, the upgrading and repair of headworks is calculated by the deterministic method and have met the technical and economic requirements, but there is not much quantitative relationship with flood risk of the downstream areas. Therefore, the decision to choose the option to upgrade and repair the system is highly effective and ensures the required reliability according to the acceptable risk level of the downstream area, the study introduces how to choose the optimal option when upgrading the focal system of the reservoir, the theory of reliability andrisk analysis. Apply the calculation results to choose the option when upgrading the Cam Ranh reservoir head system in Khanh Hoa province to meet ICOLD's flood prevention standards and design additional spillways according to the required reliability

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