秦岭造山带实测浅层地应力特征研究  

Research on Distribution Rule of Shallow Strata Geostress in Qinling Orogenic Belt

作　　者：张波[1] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《地下空间与工程学报》2016年第2期392-396,共5页Chinese Journal of Underground Space and Engineering

基　　金：陕西省铁道及地下工程重点实验室项目(12-06);国家自然科学基金(41272322)

摘　　要：秦岭造山带基本呈东西走向,由于经历了长期的构造运动、岩浆活动和变质作用,形成了"三块两缝合带"的构造格局。整体来说,区域内断裂构造发育,岩性复杂,构造应力高且以水平应力为主。在秦岭地区,我国已陆续建成了宝成铁路、西康铁路、秦岭公路等一系列交通工程,但由于受复杂构造、地应力及岩性的影响,隧道建设过程中遇到如收敛变形量大、变形不易控制等诸多难题。为详细研究秦岭地区浅层地应力分布特征,通过收集秦岭造山带自西向东区域内29个钻孔的地应力实测资料,筛选出受局部影响较小的101组数据作为统计样本进行分析,分析了秦岭地区最大水平主应力、最小水平主应力以及侧压系数随埋深分布特征,并验证了构造应力方向以NNE,NNW为主,反映了顺时针NE-SW和逆时针NW-SE的构造方向特征。Due to the tectonic movement and magmatic activity in a long time,the E-W-trending structure of Qinling orogenic belt was formed into tectonic framework with three plates and two suture zones. On the whole,there is fault developed,the lithology is complex and the tectonic stress is high and mainly horizontal one. There has been a series of traffic engineering works constructed such as： Baoji-Chendu Railway,Xi’an-Ankang Railway,Qinling highway and so on. However,affected by the complex structure,geostress and lithology,the tunnel construction faced many difficulties,such as large convergence deformation and difficult to control. For studying the shallow crustal stress distribution characters,the geostress observation data from about 29 drillings arranged from west to east are collected and 101 groups of data with less local influence are selected. The trend of the maximum and the minimum horizontal principal stresses with the depth are established. The dispersed point charts of ratios of the maximum and the minimum horizontal principal stresses varying with the depth in Qinling orogenic belt are established. And the trend of the lateral pressure coefficient with depth is also established. The principal structural stress directions mainly are NNE and NNW,that reflects the structural direction characters as in clockwise direction NE-SW and in counter clockwise NW-SE.

关 键 词：秦岭造山带 地应力 分布特征 

分 类 号：TU45[建筑科学—岩土工程]