基于TAP模型的深层隧道水力学流态分析

Analysis on Hydraulic Flow Pattern of Deep Tunnels Based on TAP Model

摘要:

以镇江金山湖多功能大口径管道系统为研究对象，利用TAP（Transient Analysis Program）模型对深层排水隧道内的水力学流态进行模拟分析，重点研究浪涌现象的成因及其危害。通过模拟不同降雨工况下的水流状态，发现浪涌现象主要表现为负压、气穴和掺气等，尤其是在50 年一遇的3 h降雨工况下，隧道内出现较大的负压和水面震荡；此外，末端泵站的启停水位设置不合理，导致泵组启停过于频繁，可能对水泵造成损害。通过对竖井尺寸的敏感性分析，发现较大的竖井直径有助于减少浪涌现象的发生。

Abstract:

Taking the multifunctional large-diameter pipeline system of Jinshan Lake in Zhenjiang as the research object, the TAP (Transient Analysis Program) model is utilized to simulate and analyze the hydraulic flow patterns in the deep drainage tunnel, and the focus is on studying the causes and hazards of surge phenomena. By simulating the water flow conditions under various rainfall scenarios, it is found that the surge phenomena primarily manifest as the negative pressure, cavitation and aeration. Especially under the 3-hour rainfall condition that occurs once every 50 years, the significant negative pressure and water surface oscillations are observed in the tunnel. Additionally, the inappropriate start-stop water level settings in the terminal pumping station will lead to excessively frequent pump start and stop, which may cause damage to the water pump. Through the sensitivity analysis of shaft dimensions, it is found that the larger shaft diameter helps to reduce the occurrence of surge phenomena.