A flood drill method for homogeneous cohesive soil dam overflow collapse for flood control drills

Abstract

The invention discloses a homogeneous clay earth dam overtopping break drill method for emergency flood-fighting drill. On the basis of a dam break model, the method involves an earth dam body constructed by filling of clay, the earth dam comprises an upstream dam abutment, a dam crest and a downstream dam abutment, and a control gate for water level regulation is arranged at the upstream positionof the model. The bottom of the downstream dam abutment of the earth dam body is provided with a cavity layer filled with a powder sand layer. A homogeneous clay earth dam overtopping break model anddrill method for emergency tactical flood-fighting drill have advantages that by innovative dam break section design, dam break simulation of break as needed under low-speed water flow conditions isrealized, the technical problem of failure in break as needed in previous model test is solved, applicability to revealing of a clay earth dam break mechanism under an overtopping water flow action and demonstrating of a water-soil coupling action in a dam break process is realized, and a function of carrying out dam break disaster training on emergency tactical flood-fighting specialized personnel is achieved.

Description

technical field [0001] The invention relates to a drill method for flooding and collapse of a homogeneous cohesive soil dam used for flood control and rescue drills, and belongs to the technical field of homogeneous cohesive soil dam test theory. Background technique [0002] According to the data of the first national water conservancy census, nearly 100,000 reservoir dams have been built in my country, of which more than 90,000 are homogeneous earth dams, and most of the reservoir projects in my country were built in the 1950s to 1970s, limited by the economic and technological conditions at that time , The dam construction standard is low and the quality is poor. Coupled with long-term insufficient investment in management funds, insufficient maintenance, serious aging and disrepair of the project, "congenital deficiencies and acquired disorders" have led to the existence of a large number of dangerous reservoirs in our country. According to the census statistics of the D...

AI Technical Summary

Problems solved by technology

Because homogeneous dams are generally composed of cohesive soil, and cohesive soil has strong erosion resistance, and its start-up flow velocity is generally around 2m / s, it is difficult for small-scale model tests to meet the hydraulic conditions for its collapse. Model tests mostly use sandy soil whose start-up flow rate is about 1 / 100 of the cohesive soil, but the failure mode of sandy soil dams is shear failure, while the failure mode of cohesive soil dams is dumping failure, and the failure mechanisms of the two are completely different

[0004] (2) The scale of the model is large and the test cost is high

Large-scale physical dam failure tests can better reveal the failure mechanism of cohesive soil dams, but it is generally difficult to find a suitable test site, and the test costs are high and time-consuming. At the same time, with the increase of dam height, The risk of experimentation is also greater

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