国道317线新建矮拉山越岭隧道综合勘探技术应用研究
发布时间：2018-08-01 15:19
【摘要】：原国道317矮拉山绕山公路长约22km,沿线平均海拔4300m以上,雪崩、滑坡等自然灾害严重。随着西藏和四川的物流往来逐年加大,矮拉山公路路况每况愈下,已无法满足正常的通行需求,成为制约西藏昌都地区经济发展的瓶颈之一。为减小行程,保证317国道的正常运营,拟新建矮拉山隧道工程。隧址区位于西藏自治区昌都地区江达县岗托镇矮拉乡与同普乡交界处,山高坡陡,高寒缺氧,地形条件较差,无常驻居民,物资匮乏。结合对矮拉山隧址区的考察以及近年来深部物探的应用情况,本文提出以大区域范围深部物探为主,结合关键部位定点钻探的综合勘探方法。在对矮拉山隧址区工程地质背景进行了调研的基础上,本文对钻探、地震波法、MT法、CSAMT法、EH4法和高密度电法6种勘探方法的基本原理、精度、勘探深度、经济性等方面的特点和适用条件进行了分析,并对这6种方法在深埋隧道勘探中的应用情况进行了调研,经过比选得到了矮拉山隧道的勘探方法,即沿隧道纵轴方向大范围采用EH4深部勘探技术,结合高密度电法和钻探结果对隧道进出口等重要位置进行验证,并通过地应力测试、声波测井、波速测试为地应力等级分析、围岩分级、抗震设计提供必要的参数。为了验证所选取的综合勘探方法在矮拉山隧道勘探中的有效性,本文在矮拉山隧址区进行了现场试验。通过对比各种试验的勘探结果,查明了矮拉山隧址区的地质情况：隧址区工程地质条件较简单,隧道围岩为Ⅱ～Ⅴ级,未发现地面开裂、沉陷、滑坡等不良地质现象,进出口自然斜坡整体稳定。从综合勘探方法在矮拉山越岭隧道工程的应用结果可以看出,不同勘探方法的作用有所差异,各种方法相互配合、互相印证,最终得到深埋隧道的勘探结果。综合勘探方法是勘察深埋隧道的一种有效方法。本文提出的深埋隧道的综合勘探方法是针对矮拉山隧道研究得到的,对今后的类似工程具有一定的参考价值。受单位设备和时间所限,本文未能广泛地研究和试验其他先进有效的勘探方法。
[Abstract]:The old national highway 317 Paila mountain around the mountain highway is about 22 km long, the average elevation along the road is above 4300 m, the natural disasters such as avalanche, landslide and so on are serious. With the increasing of the logistics between Tibet and Sichuan, the road condition of Paila Mountain is getting worse and worse, which can not meet the normal traffic demand, and has become one of the bottlenecks restricting the economic development of Qandu region in Tibet. In order to reduce the stroke and ensure the normal operation of National Highway 317, it is proposed to build a new Haila Mountain Tunnel. The tunnel site is located at the junction of Paila Township, Gangtuo Township, Jiangda County, Changdu region, Tibet Autonomous region, with steep mountain slopes, high cold and hypoxia, poor topographic conditions, no resident residents and lack of materials. Combined with the investigation of the Paila Mountain Tunnel site and the application of deep geophysical prospecting in recent years, this paper puts forward a comprehensive exploration method based on the large area of deep geophysical exploration and combined with the fixed point drilling at the key site. Based on the investigation of the engineering geological background in the Paila Mountain Tunnel area, this paper deals with the basic principles, accuracy, depth of exploration of six exploration methods, namely, drilling, seismic wave method, CSAMT method, EH4 method and high-density electrical method. The characteristics and applicable conditions of economy and other aspects are analyzed, and the application of these six methods in deep buried tunnel exploration is investigated. In other words, along the longitudinal axis of the tunnel, the deep exploration technology of EH4 is used to verify the important position of tunnel inlet and outlet with the combination of high-density electrical method and drilling results, and the in-situ stress testing, acoustic logging and wave velocity testing are used to analyze the in-situ stress grade. Surrounding rock classification, seismic design to provide the necessary parameters. In order to verify the effectiveness of the selected synthetic exploration method in the exploration of the Daila Mountain Tunnel, a field test was carried out in the site area of the Daila Mountain Tunnel. By comparing the exploration results of various tests, it is found that the geological conditions of the tunnel area are relatively simple, the surrounding rock of the tunnel is of class 鈪，
本文编号：2157992
[Abstract]:The old national highway 317 Paila mountain around the mountain highway is about 22 km long, the average elevation along the road is above 4300 m, the natural disasters such as avalanche, landslide and so on are serious. With the increasing of the logistics between Tibet and Sichuan, the road condition of Paila Mountain is getting worse and worse, which can not meet the normal traffic demand, and has become one of the bottlenecks restricting the economic development of Qandu region in Tibet. In order to reduce the stroke and ensure the normal operation of National Highway 317, it is proposed to build a new Haila Mountain Tunnel. The tunnel site is located at the junction of Paila Township, Gangtuo Township, Jiangda County, Changdu region, Tibet Autonomous region, with steep mountain slopes, high cold and hypoxia, poor topographic conditions, no resident residents and lack of materials. Combined with the investigation of the Paila Mountain Tunnel site and the application of deep geophysical prospecting in recent years, this paper puts forward a comprehensive exploration method based on the large area of deep geophysical exploration and combined with the fixed point drilling at the key site. Based on the investigation of the engineering geological background in the Paila Mountain Tunnel area, this paper deals with the basic principles, accuracy, depth of exploration of six exploration methods, namely, drilling, seismic wave method, CSAMT method, EH4 method and high-density electrical method. The characteristics and applicable conditions of economy and other aspects are analyzed, and the application of these six methods in deep buried tunnel exploration is investigated. In other words, along the longitudinal axis of the tunnel, the deep exploration technology of EH4 is used to verify the important position of tunnel inlet and outlet with the combination of high-density electrical method and drilling results, and the in-situ stress testing, acoustic logging and wave velocity testing are used to analyze the in-situ stress grade. Surrounding rock classification, seismic design to provide the necessary parameters. In order to verify the effectiveness of the selected synthetic exploration method in the exploration of the Daila Mountain Tunnel, a field test was carried out in the site area of the Daila Mountain Tunnel. By comparing the exploration results of various tests, it is found that the geological conditions of the tunnel area are relatively simple, the surrounding rock of the tunnel is of class 鈪，
本文编号：2157992
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