佛莞城际铁路狮子洋隧道的几个关键技术问题

发布时间：2018-08-17 13:17

【摘要】：研究目的:佛莞城际铁路狮子洋隧道结构外径13.1 m,是国内目前最大直径的铁路盾构隧道。工程具有大直径(13.1 m)、高水压(最大水压7.8 bar)、地质条件复杂(土岩复合地层,穿越三处破碎带和两处水下断层)、行车速度高(时速200 km)、盾构机类型新(土压-泥水双模式盾构)等特点。为保证施工与运营安全,必须妥善解决总体设计、施工组织设计、结构抗灾与防灾疏散设计等关键技术问题。研究结论:(1)复合地层水下隧道宜埋置于基岩中,岩石覆盖厚度可按"满足施工进舱作业安全,且围岩松弛压力与形变压力之和相对较小"的原则确定;(2)隧道长度不大时可采用单孔双线结构,并在隧道底部设置疏散廊道,同时采用中间箱涵预制的方式实现同步施工;(3)为减少局部岩层破碎带对施工的影响,可采用土压-泥水双模式盾构掘进;(4)为提高结构的抗灾性能,在钢筋混凝土管片内双掺钢纤维和聚丙烯纤维是一种可行的方案;(5)该研究成果可应用于复合地层盾构法水下隧道的设计。
[Abstract]:Objective: the Lion Ocean Tunnel of Foguan-Guancheng Railway is 13.1 mm outer diameter, which is the largest diameter of shield tunnel in China at present. The engineering has a large diameter (13.1 m),) high water pressure (maximum water pressure 7.8 bar),) complex geological conditions (soil-rock complex formation, Through three broken zones and two underwater faults), high speed (200 km), per hour shield machine new type (earth pressure-mud water double mode shield) and other characteristics. In order to ensure the safety of construction and operation, the key technical problems such as overall design, construction organization design, structural disaster resistance and disaster prevention and evacuation design must be solved properly. The conclusions are as follows: (1) the underwater tunnel in composite stratum should be buried in the bedrock, and the thickness of the rock cover can meet the safety of the construction operation. And the principle that the sum of relaxation pressure and deformation pressure of surrounding rock is relatively small is determined. (2) when the tunnel length is small, a single hole and two lines structure can be adopted, and an evacuation corridor is arranged at the bottom of the tunnel. At the same time, the prefabricated intermediate box culvert is adopted to realize synchronous construction. (3) in order to reduce the influence of local rock layer breaking zone on the construction, the double-mode shield tunneling with soil pressure and mud water can be adopted; (4) in order to improve the anti-disaster performance of the structure, It is feasible to add steel fiber and polypropylene fiber into the reinforced concrete segment. (5) the research results can be applied to the design of underwater tunnel with shield method in composite stratum.
【作者单位】：中铁第四勘察设计院集团有限公司;
【分类号】：U459.5

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