摘要
青藏高原东缘广泛发育着深大活动断裂带,强烈控制着高原东缘区域应力场。本文基于收集的178个点位1181组原位应力数据,通过数值模拟反演得出青藏高原东缘活动断裂影响下青藏高原东缘地应力场,结果表明,青藏高原地应力场呈现出明显的非均匀性特征,应力量值由西向东逐渐减小。然后,利用ArcGIS分析青藏高原东缘埋深100~2000 m岩爆及大变形趋势,岩爆集中产生于次级板块内部,岩爆范围基本不随深度变化;而大变形产生于次级板块边界,并随深度增加面积逐渐向板块内部扩大;岩爆及大变形风险等级随埋深呈现规律性变化。最后,通过二郎山隧道隧址区以及双江口水电站两个工程实例探讨了本研究在工程建设中对岩爆及大变形趋势预测的适用性,结果表明,本文给出的青藏高原东缘地下工程灾害趋势与基于强度应力比方法获得的岩爆倾向性以及工程实例中岩爆现象基本一致。
A series of deep and large active fault zones are widely developed in the eastern margin of the Qinghai-Tibet Plateau,which strongly controls the regional stress field.Here we determine the in-situ stress field under the influence of active faults in the eastern margin of the Qinghai-Tibet Plateau by numerical simulation inversion of an extensive collection of 1181 groups of in-situ stress data collected from 178 points.The result show that an obvious non-uniformity is the most significant characteristic in the Qinghai-Tibet Plateau.The stress value decreases gradually from west to east.The potential of rock burst and large deformation at the depth of 100~2000m in the eastern margin of the Qinghai-Tibet Plateau is also analyzed by ArcGIS.Rock burst is concentrated within the secondary plate while the large deformation mainly occurs at the boundary.The area of rock burst does not change with depth basically,however,large deformation gradually increases and develops to the interior of the secondary plate.The potential of rock burst and deformation changes regularly with the buried depth.Finally,two engineering cases of Erlang Mountain tunnel and Shuangjiangkou Hydropower station are presented to discussed the applicability of the prediction of rock burst and large deformation potential.The results indicate that the underground geohzards potential in the eastern margin of Qinghai-Tibet Plateau predicted in this study is basically consistent with the rock burst tendency based on the strength-stress ratio and the rock burst phenomenon in the two cases.
作者
李金轩
郭松峰
祁生文
张亚国
郑博文
唐凤娇
马行东
张世殊
LI Jinxuan;GUO Songfeng;QI Shengwen;ZHANG Yaguo;ZHENG Bowen;TANG Fengjiao;MA Xingdong;ZHANG Shishu(Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;School of Civil Engineering,Chang an University,Xi'an 710061,China;Institutions of Earth Science,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,College of Earth and Planetary Sciences,Beijing 100049,China;Chengdu Engineering Coporation Limited,Power China,Chengdu 610072 China)
出处
《工程地质学报》
CSCD
北大核心
2023年第3期736-749,共14页
Journal of Engineering Geology
基金
第二次青藏高原综合科学考察研究(资助号:2019QZKK0904)
国家自然科学基金(资助号:41825018,42077266)
中国科学院青年创新促进会(资助号:2022062)。
关键词
青藏高原东缘
地应力
岩爆
大变形
地质工程
The eastern margin of Qinghai-Tibet Plateau
Geostress
Rock burst
Large deformation
Geoengineering
