Study on Safety Assessment and Renovation Measures of a Reservoir Dam

摘要

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. 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. 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.