【作者】 何明峰；

【导师】 蒋正红；

【作者基本信息】 西南交通大学 ， 地球探测与信息技术， 2010， 硕士

【摘要】 深埋长大隧道的工程地质宏观预测仍然是当今世界各国工程界亟待解决的重大科研课题。可控源音频大地电磁测深(CSAMT)法具有探测深度大,不受高阻层屏蔽,横向分辨率高,可灵敏地发现断层,抗干扰能力强,工作效率高,工作成本低廉和野外装备较轻便等特点,因此CSAMT法在工程勘察中得以广泛的应用。论文结合磨刀石隧道和韩信岭隧道,开展了CSAMT法在深埋长大隧道勘察中的应用与研究。对深埋长大隧道的地层岩性、地质构造、赋水情况进行了成功的解释,结合区域地质资料,划分了隧道围岩级别,为隧道的设计、施工提供了科学的依据。减少了钻探和山地工作量,缩短了勘察周期,降低了成本,一定程度上填补了难以进行钻探工作地段的地质“空白”。论文同时分析总结静态效应的影响因素有：静态体的埋深、横向宽度、厚度、电阻率以及电场测量偶极长度。静态效应校正的方法主要有：空间滤波法、时频分离与压制、静校正相位法、利用磁场实测数据作静校正、联合反演法、二维正演模拟法、直接二维反演法、电磁列阵剖面法(EMAP)。根据实际勘察目标,确定了收发距和工作频率对CSAMT法的影响。通过分析和结合CSAMT法在磨刀石隧道和韩信岭隧道的应用,得到如下结论：1.必须根据勘探目标,适当选择收发距离和频率。2.探测深部的大目标,应该选择较大的MN,而对于较浅部的小地质目标,MN应选择小一些。3. CSAMT法能够比较准确地判断地层岩性、地质构造、以及地下水赋存情况。4. CSAMT法对浅层的分辨能力较差。更多还原

【Abstract】 Deep and long Tunnel Engineering Geology macro forecast is still urgent to solve as a major topic research in the engineering world today.Controlled Source Audio-frequency Magnetotelluric(CSAMT) has the detection depth,not high resistance layer of shielding,the high horizontal resolution can be sensitive to find fault,anti-interference ability,high efficiency,low cost of work and field equipment,lighter, etc.,so the method of CSAMT can be widely used in engineering Exploration.This thesis combined the Mo Daoshi and Han Xinling tunnel,carried out CSAMT research and application in the detection of deep and long tunnel.Successfully explained the lithology,geological structure,the water situation of the deep and long tunnel,combined with regional geological data,divided the tunnel level,for the tunnel design and construction provid the basis.Reduced drilling and mountain workload, reduced inspection cycle,to a certain extent,reduced the cost to fill the difficult geological drilling site blank.This thesis also analyzed and summarized the effects of static factors:static body buried depth,horizontal width,thickness and resistivity and and the length of the dipole electric measurement.The method of correction mainly has:spatial filtering, time-frequency separation and repression,static correction phase method,using magnetic phase measurement data for static correction,joint inversion,2D modeling simulation,direct 2D inversion,EMAP.Based on actual survey objectives,determined the distance and the transceiver operating frequency of CSAMT.By analyzed and combined CSAMT in the application of Mo Daoshi and HanXinLing tunnel,We have the following conclusions:1.Based on exploration targets, appropriately choose the communication distance and frequency.2.Probing deep goals, should choose the larger MN, while the Ministry for the small shallow geological targets, MN should choose smaller.3. CSAMT method can accurately judge strati graphical lithology, geological structure and groundwater storage conditions.4.CSAMT is bad to the shallow layer resolution.更多还原