文档介绍：摘要
浅层折射波法是工程勘探中常用的一种快速经济并且是有效的方法,在探测基岩或第
四系地层中持力层的起伏、埋深、波速,划分风化带、确定断层破碎带位置等方面能发挥独特而重要的作用。本文张涿高速公路将对我省西北部及我国西北地区物资出海,对缓解北京过境交通压力,解决西部车辆至京南、天津、冀中南的绕京通行问题,带动张家口和保定地区经济发展具有重要意义。根据该区区域地质特征及此项目的目的,须确定隧道各区段的覆盖层厚度,基岩埋深,围岩波速及低速带位置。所以在初步踏勘、资料收集与试验的基础上,依据该区地层的物性特征,利用地震折射波法进行了工程勘察工作。对浅层折射波法采用双重相遇时距曲线观测系统、NZ-24浅震仪、人工锤击震源、24道、最大排列长度230米进行野外工作。根据野外工作所采集的地震道记录分析折射波的同相性、波形的相似性、振幅的变化等经过数字滤波、增益控制等校正处理后,读取初至值,计算、绘制时距曲线图,用表层剥去法推断解释,利用计算机CAD软件绘制剖面图。提交的最终成果图,基本说明了测线布设范围内覆盖层厚度与基岩风化层厚度;测线范围内隧道洞身围岩波速一般较高,V=~;在K46+790~K46+870段发现一处低速带异常,推测该段基岩裂隙发育或强风化层厚度相对较大。本次工作任务的圆满完成为隧道工程进一步的设计和开挖提供了地质依据,证实该法在此次隧道勘察中是有效可行的。
关键词:工程勘察;公路隧道;浅层折射波法;
ABSTRACT
Shallow Refraction monly used in engineering exploration of a rapid economic and effective way to detect bedrock or Quaternary strata bearing stratum of the ups and downs, depth, velocity, weathering zone delineation to determine the fault fracture zone location can play a unique and important role. In this paper, Zhang Zhuo highway will be the north-west province in Northwest China supplies and sea transit to alleviate traffic pressure on Beijing to resolve the vehicles to the west Jingnan, Tianjin, Beijing JIZHONG passage around the south of the issue, Zhangjiakou and Baoding drive regional economic development significance. According to regional geological characteristics of the area and the purpose of this project, the tunnel sections to determine the thickness of the cover, bedrock depth, velocity and low-speed zone surrounding the location. Therefore, in the initial spot survey, data collection and trial on the basis of the formation based on the physical properties of the area characteristics, the use of seismic refraction wave method to carry out the work of the engineering investigation. Of shallow refraction wave method using time-distance curve of the dual meet observing system, NZ-24 On Chun-yee, artificial hammering the source, 24path,the maximum length of 230 meters with field work. Based on field work by collecting records of