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STUDY ON GROUND SUBSIDENCE LAW OF SHIELD TUNNEL CON-STRUC-TION IN KARST AREA
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摘要: 隧道建设过程中，地下岩溶是诱发地面塌陷事故的主要原因之一。针对盾构隧道周围土层含有隐伏溶洞的情况，通过GTS/NX有限元数值分析软件，研究了相同断面面积下不同形状、不同位置、不同水平长度的岩溶对地表沉降的影响程度。研究结果表明：横向椭圆形溶洞是最不利的溶洞形状；水平位置中，溶洞位于隧道一侧特别是在隧道40°～50°方向上，地表沉降显著增大；竖向位置上存在一个"临界净距"，使得地表沉降量最小；溶洞水平长度超出某一定值后，地表沉降量急剧增加。研究所得到的地表沉降规律为溶洞所在地层的变形、事故的预测及处理方案的制定提供依据。Abstract: In the process of tunnel construction, underground karst is one of the main causes of ground collapse. In view of the situation that there are hidden karst caves in the soil layer around the shield tunnel, to explore the influence of karst caves on the law of surface settlement, this paper carries out research from the aspects of karst cave shape, different positions and different horizontal lengths by using GTS/NX finite element software. The results show that the lateral ellipse cave is the most unfavorable shape. In the horizontal position, the karst cave is located on one side of the tunnel, especially in the direction of 40°~50°, and the surface settlement increases significantly. There is a "critical clear distance" in the vertical position, which minimizes the surface settlement. When the horizontal length of the cave exceeds a certain value, the surface settlement increases sharply. The surface settlement law obtained by the research provides the basis for the deformation of the stratum where the karst cave is located, the prediction of the accident and the formulation of the treatment scheme.
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Keywords:
- Karst /
- Surface subsidence /
- Shield tunnel
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