Study on Safety Assessment and Renovation Measures of a Reservoir Dam

According to the status quo of a reservoir dam, relevant hydraulic calculations and structural calculations are carried out on the dam body and its ancillary buildings, which reveal that the dam body was not up to standard for flood control, the left abutment of the dam body was leaking, sliding resistance of downstream slope of dam body was insufficient, the height of the spillway side wall was insufficient, and length of the stilling pool was insufficient and so on. In response to these problems, the corresponding engineering and technical renovation measures were proposed for the main buildings of the dam. The results of finite element analysis and the implementation of renovation measures show that the renovation plan is economically reasonable and technically feasible, the reservoir diseases problems can be eliminated, the reservoir functions can be restored, and the renovation effect is obvious. Earth rock dams occupy a considerable proportion in the early construction of small reservoir dams in our country. Problems have appeared in some of them, such as dam body leakage, dam slope instability, failure of drainage measures, failure of flood control standards and so on after operating for many years, under the combined action of one or more factors such as unreasonable original design, low-level construction quality, unfulfillment of later operation management, untimely maintenance, earthquake disasters, termite disasters and so on [1]. The diseased reservoirs, which are out of repair for a long time, not only have low economic benefits, but also have great potential safety hazards, which seriously restrict the development of the comprehensive benefits of the reservoirs[2]. Therefore, it is imperative to improve and renovate the diseased reservoirs and restore the comprehensive performance of the old reservoirs. Taking a homogeneous earth reservoir dam as a typical case, this paper reveals many kinds of diseases existing in the homogeneous earth dam by calculation and analysis, and puts forward corresponding renovation measures, which can provide ideas and technical references for the renovation scheme of similar reservoir dams[3]. General Situation of Engineering A reservoir is located in a ditch in the upper reaches of Xian River, a tributary of Long River. The dam site is located in Changsha Bayi Village, Dining County, 8 km away from the county. There is no flood control and rescue road directly to the dam top, and traffic here is inconvenient. The total reservoir capacity is 129,000 m3, the dead reservoir capacity is 96,000 m3, the designed irrigation area is 312 mu, and the actual irrigation area is 100 mu. It is a small (2) type water conservancy project that is mainly based on irrigation and has comprehensive utilization of flood control. The reservoir dam is a homogeneous earth dam. It is with a maximum height of 11.21m, a bottom elevation of 463.06m, a top elevation of 474.27m, a top width of 2.7m, a top length of 89.60m and a bottom maximum width of 44.30m. The upstream slope ratios are 1:1.6 and 1:1.94 from top to bottom, and the downstream slope ratio is 1:1.8. The upstream slope of the dam is protected by 100 mm thick C15 concrete with 50 International Conference on Modeling, Analysis, Simulation Technologies and Applications (MASTA 2019) Copyright © 2019, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Intelligent Systems Research, volume 168