Overflow structure for preventing lake outburst in permafrost regions

Abstract

The invention relates to an overflow structure for preventing lake outburst in permafrost regions. The overflow structure comprises water stop banks (1) arranged on the two sides of an overflow port and a buried culvert flow guiding structure arranged at the position of the overflow port. Each water stop bank (1) comprises a soil filling layer (6) and a rock block layer (7) laid on the upper surface of the soil filling layer (6). The buried culvert flow guiding structure comprises an exchanging and filling layer (2), a heat preservation layer (3) and a plurality of corrugated pipe culverts (4), the exchanging and filling material of the exchanging and filling layer is frost heaving non-sensitive coarse particle soil aggregates, and the bottom face of the exchanging and filling layer is located below the permafrost upper limit by 1.5 m-2 m. Through the water stop bank structure, the lower permafrost upper limit can be elevated, and the lake overflow position and range are effectively controlled through watertightness of the permafrost. Through the buried culvert flow guiding structure, hot erosion to the lower permafrost through the overflow water body can be effectively reduced, and overflow structure foundation unstability and structure failures are prevented. Through application of the overflow structure, long-term stability and effectiveness of the overflow structure can beeffectively guaranteed, orderly controllable leakage of the lake in the permafrost regions is achieved, and lake outburst is prevented.

Description

technical field [0001] The invention relates to the technical field of hydraulic engineering in permafrost regions, in particular to an overflow structure for preventing lake collapse in permafrost regions. Background technique [0002] Studies and monitoring have shown that with climate warming in recent years, rainfall in the permafrost regions of the Qinghai-Tibet Plateau has increased significantly. Under the background of climate warming and increasing rainfall, the area and water volume of lakes in permafrost regions continue to increase, and there is a risk of overflow. Taking the Hoh Xil region as an example, a large area of ​​continuous permafrost develops in this area, and the climate has shown a trend of warming and humidification in the past 50 years, and it was more obvious in 2000. Affected by the process of warming and humidification, the area and water volume of lakes in the region continue to increase, and there is a risk of bursting and overflowing. For ex...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an overflow structure for preventing lakes from collapsing in permafrost regions, so as to overcome the short-term damage caused by concrete hydration heat and overflow water to the underlying permafrost of conventional diversion structures in the prior art. and long-term thermal erosion, resulting in the technical problems of foundation instability and structural failure of the diversion structure

Images