發(fā)布時(shí)間：2018-08-01 15:19

【摘要】：原國(guó)道317矮拉山繞山公路長(zhǎng)約22km,沿線平均海拔4300m以上,雪崩、滑坡等自然災(zāi)害嚴(yán)重。隨著西藏和四川的物流往來逐年加大,矮拉山公路路況每況愈下,已無(wú)法滿足正常的通行需求,成為制約西藏昌都地區(qū)經(jīng)濟(jì)發(fā)展的瓶頸之一。為減小行程,保證317國(guó)道的正常運(yùn)營(yíng),擬新建矮拉山隧道工程。隧址區(qū)位于西藏自治區(qū)昌都地區(qū)江達(dá)縣崗?fù)墟?zhèn)矮拉鄉(xiāng)與同普鄉(xiāng)交界處,山高坡陡,高寒缺氧,地形條件較差,無(wú)常駐居民,物資匱乏。結(jié)合對(duì)矮拉山隧址區(qū)的考察以及近年來深部物探的應(yīng)用情況,本文提出以大區(qū)域范圍深部物探為主,結(jié)合關(guān)鍵部位定點(diǎn)鉆探的綜合勘探方法。在對(duì)矮拉山隧址區(qū)工程地質(zhì)背景進(jìn)行了調(diào)研的基礎(chǔ)上,本文對(duì)鉆探、地震波法、MT法、CSAMT法、EH4法和高密度電法6種勘探方法的基本原理、精度、勘探深度、經(jīng)濟(jì)性等方面的特點(diǎn)和適用條件進(jìn)行了分析,并對(duì)這6種方法在深埋隧道勘探中的應(yīng)用情況進(jìn)行了調(diào)研,經(jīng)過比選得到了矮拉山隧道的勘探方法,即沿隧道縱軸方向大范圍采用EH4深部勘探技術(shù),結(jié)合高密度電法和鉆探結(jié)果對(duì)隧道進(jìn)出口等重要位置進(jìn)行驗(yàn)證,并通過地應(yīng)力測(cè)試、聲波測(cè)井、波速測(cè)試為地應(yīng)力等級(jí)分析、圍巖分級(jí)、抗震設(shè)計(jì)提供必要的參數(shù)。為了驗(yàn)證所選取的綜合勘探方法在矮拉山隧道勘探中的有效性,本文在矮拉山隧址區(qū)進(jìn)行了現(xiàn)場(chǎng)試驗(yàn)。通過對(duì)比各種試驗(yàn)的勘探結(jié)果,查明了矮拉山隧址區(qū)的地質(zhì)情況：隧址區(qū)工程地質(zhì)條件較簡(jiǎn)單,隧道圍巖為Ⅱ～Ⅴ級(jí),未發(fā)現(xiàn)地面開裂、沉陷、滑坡等不良地質(zhì)現(xiàn)象,進(jìn)出口自然斜坡整體穩(wěn)定。從綜合勘探方法在矮拉山越嶺隧道工程的應(yīng)用結(jié)果可以看出,不同勘探方法的作用有所差異,各種方法相互配合、互相印證,最終得到深埋隧道的勘探結(jié)果。綜合勘探方法是勘察深埋隧道的一種有效方法。本文提出的深埋隧道的綜合勘探方法是針對(duì)矮拉山隧道研究得到的,對(duì)今后的類似工程具有一定的參考價(jià)值。受單位設(shè)備和時(shí)間所限,本文未能廣泛地研究和試驗(yàn)其他先進(jìn)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，

本文編號(hào)：2157992