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北京市南水北调配套工程南干渠工程,施工第二标段为2孔内径3 400 mm的钢筋混凝土隧洞。隧洞穿越建筑物主要有民房、高压燃气管、灌渠、交通路以及深埋垃圾坑,施工环境复杂,同时要穿越砂砾石、砂卵石、漂石、细砂、砂岩、黏土、滞水及杂填土等地层,其中卵砾石集中区、粉细砂以及含水量较大地层常会造成注浆效果不佳难以固结。结合南干渠工程实践,分析了不同地质情况的塌方原因,提出了预防隧洞塌方的技术措施。
Beijing South-North Water Diversion Project South Main Canal project, the second section of the construction is a 2-hole reinforced concrete tunnel with an inner diameter of 3 400 mm. The tunnels are mainly composed of houses, high-pressure gas pipes, irrigation ditches, traffic roads and deep-lying garbage ditches. The construction environment is complicated and sandstone, gravel, boulder, sand, sandstone, clay, stagnant water and miscellaneous fill Soil and other strata, of which the gravel concentrate area, fine sand and water content of the larger strata often result in poor grouting ineffective consolidation. Combined with the engineering practice of the South Main Canal, the causes of landslides in different geological conditions are analyzed, and the technical measures to prevent tunnel collapse are proposed.