Intermittent layer horizontal water leakage prevention structure of roller compacted concrete dam in severe cold area

Abstract

The invention discloses an intermittent layer horizontal water leakage prevention structure of a roller compacted concrete dam in a severe cold area. The intermittent layer horizontal water leakage prevention structure involves a lower layer pre-poured concrete layer, an upper layer post-poured concrete layer poured on the upper part of a lower layer pre-poured concrete layer, possible horizontalcracks existing between the lower layer pre-poured concrete layer and the upper layer post-poured concrete layer, a preformed groove formed before the lower layer post-poured concrete layer pours theupper layer pre-poured concrete layer, geotechnical cloth is arranged at the position, close to the downstream side, inside the preformed groove, and the preformed groove is backfilled with clay. According to the structure, by backfilling the clay in the preformed groove, dam body water leakage is effectively prevented when the horizontal cracks exist, construction is convenient, investment is small, and the effect is good.

Description

technical field [0001] The invention relates to a horizontal water leakage prevention structure for an interim layer of a roller compacted concrete dam in severe cold regions. Background technique [0002] The construction of roller compacted concrete gravity dams in severe cold areas often causes cracks due to harsh climatic conditions - "cold, hot, windy, dry". "Cold" means that the annual average temperature in alpine regions is very low, the monthly average temperature in winter is below -10°C, and there are frequent cold waves throughout the year, and the temperature difference between day and night is large; ℃; "wind" means that there are many windy weather in severe cold areas, strong wind, high wind speed, and water is easy to evaporate; "dry" means that the climate is dry in spring and autumn in alpine areas. These climatic characteristics are extremely important for the temperature control and crack prevention of RCC. unfavorable. The low annual average temperatu...

AI Technical Summary

Problems solved by technology

The low annual average temperature leads to a low stable temperature of the dam body, while the maximum temperature of the concrete poured in summer is relatively high, resulting in a large temperature difference in the foundation of the dam (often exceeding the specification), and penetrating cracks often appear in the foundation due to the large temperature difference in the foundation; throughout the year The cold wave is frequent and the temperature difference between day and night is large. Due to the existence of intermittent periods, it often leads to a large temperature difference between the concrete poured first and the concrete poured after the upper and lower concrete, and horizontal cracks appear, which in turn leads to water leakage in the dam body.

According to research, the tensile strength between horizontal layers is only 41% to 86% of the original concrete tensile strength, so it is easy to form horizontal cracking.

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