Brief introduction of Meishan reservoir

The main tributaries in the upper reaches of the reservoir are Zhugen River, Baisha River, Mahe River and Baishui River 1 1 Shanxi. The basin area of the reservoir area is 1970 square kilometers, accounting for 28.6% of the total area of Shihe River basin, with a total storage capacity of 2.337 billion cubic meters. Corresponding flood level 140.77m, flood control storage capacity165438+39 million cubic meters, beneficial storage capacity of 796 million cubic meters, dead storage capacity of 402 million cubic meters, limited water level in flood season 125.27m, and flood control standard is once in a million years.

Meishan multi-arch dam is a reinforced concrete structure, with the maximum dam height of 88.24 m, dam crest elevation 140. 17 m, breakwater crest elevation141.27 m. The multi-arch dam consists of 15 piles and/kloc-0. The bottom arch ring is 2.3 meters thick, the top arch ring is 0.6 meters thick, and the inner diameter is 6.75 meters ... The crib adopts hollow double buttress structure, which consists of crib walls on both sides, upper and lower panels and partition walls inside the crib. The upstream face slab width of No.3 ~ 13 is 6.5 m, the upstream face slab width of No.2 and No.2 left bank 1 4 and No.5 right bank 15 is 6.0m, and the downstream face slab width increases with the increase of dam height. The upstream slope of the chimney is 1:0.9, and the downstream slope is 1:0.35. The left and right ends of the multi-arch dam are respectively connected with a gravity dam and a hollow gravity dam, and the total length of the dam axis is 443.5 m. The hub building also includes an open spillway and a spillway tunnel on the right bank. No.9 arch spillway and powerhouse behind dam.

There was an operation accident at the initial stage of Meishan multi-arch dam impoundment. 1On September 28th, 962, the reservoir was filled to the highest water level after completion 125.56 m, and the high water level continued until the early morning of1October 6th. Suddenly, a large amount of water leaked from the bedrock cracks on the right bank abutment, and the measured total water leakage reached 70 l/s. An unsealed consolidation grouting hole of pile foundation 14 was blocked. Cracks appeared in many places on the crest, arch and pile of the right bank, among which cracks appeared on the inner side of arch crown 15, which extended downward from the arch crown to 28 m, with the maximum crack width of 6.6 mm After the inspection of the emptying reservoir, it was found that the bedrock length near the contact surface of pier 13 on the right bank to 16 abutment was more than 100 m, and the dam foundation was adopted. After two floods in 1969 and 199 1 year and 40 years of operation test, the dam runs normally. 199 1~ 1992 Meishan multi-arch dam was inspected regularly for the first time, and it was confirmed to be in conformity with the current specifications, and it was assessed as normal dam.