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中文摘要：
为避免细砂卵砾石互层隧道施工中发生隧道坍塌、砂涌和冒顶等事故,以在建的国道317线岗托隧道为工程依托,采用现场试验和测试的方法,就超前支护措施适宜性,细砂卵砾石互层隧道地表沉降、洞周变形、围岩深部位移,锚杆轴力、钢拱架内力、围岩-初期支护等支护体系特性进行研究,结果表明：细砂卵砾石互层隧道采用小导管注浆难度大,管棚间隙有砂涌,隧道变形大;采用大管棚配合水平旋喷桩进行超前支护,能有效控制砂涌,围岩变形小.
英文摘要：
In order to avoid the occurrence of accident such as collapse, sand flow, roof caving,this paper presents a study of the GangTuo tunnel in the 317 national highway. Field experiments analysis and field meas-urement are presented in this paper to investigate the suitability of pre-reinforcement, the variation laws of sur-face subsidence , tunnel deformations and the final displacement distribution of deep surrounding rock, axis forces of anchors, contact pressures between surrounding rock and primary support, and the internal forces in arch frames. The results show that for the inter-bedded strata sand-gravel tunnel , the small ductules grouting is difficult, the pre-grouted pipe shed could induce large deformation and the sand flow will take place in the pipe shed clearance. The sand flow and the large deformation can be controlled effectively by means of the pipe shed with rotary horizontal jet grouting pile.
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