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险情发生后应迅速降低库水位,减轻险情压力和抢修难度。这是因为当水库发生险情时,如果库水位在接近校核洪水位或持续高水位的情况下,大坝渗透压力、渗透比降、水,压力增加,将会加剧漏洞、管涌和流土等险情的恶化。并且在高水位作用下的滑动力增加,大坝更易出现边坡失稳、发生滑动的状况。坝体涵管在地基土大量流失的情况下,将会发生严重渗透破坏,并会造成洞身塌陷、断裂、下沉,坝坡出现塌坑等危险情况;泄水建筑物(溢洪道)、输水涵洞(管)闸门因水压力过大而无法正常开启与关闭,高水位亦可能导致漫坝状况。当工程出现险情时,降低库水位一般是抢险工作的第一步工程措施,同时也是效果最为显著的工程措施之一。
After the danger should be quickly reduced reservoir water level, reduce the pressure of danger and repair difficulty. This is because when the reservoir is in danger, if the reservoir water level is near the check flood level or the continuous high water level, the dam seepage pressure, infiltration ratio, water and pressure will increase the loopholes, Deterioration of the danger. And the sliding force under the action of high water level increases. The dam is more prone to slope instability and slippage. In the case of a large loss of foundation soil, the culvert will experience serious infiltration and destruction, and will cause collapse, fracture and sinking of the cave body, collapse of the dam slope and other dangerous situations. Drainage structures (spillways) Culvert (pipe) gate due to water pressure is too large to normally open and close, high water level may also lead to diffuse dam status. When the project appears dangerous, reducing the reservoir water level is generally the first step of rescue work engineering measures, but also the most effective one of the engineering measures.