郯庐断裂带山东段深孔地应力测量及其现今活动性分析  

In-situ stress measurement of deep borehole in Shandong segment of Tan-Lu fracture belt and analysis of its activity

作　　者：张鹏[1,2] 秦向辉[1,2] 丰成君[1,2] 孙炜锋[1,2] 谭成轩[1,2] 

机构地区：[1]中国地质科学院国土资源部新构造运动与地质灾害重点实验室,北京100081 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《岩土力学》2013年第8期2329-2335,共7页Rock and Soil Mechanics

基　　金：中国地质调查局项目"北京地区主要活动断裂工程地质稳定性评价与地应力测量"资助(No.1212011120070);国土资源部公益行业专项项目"我国东部沿海核电站区域地壳稳定性与地质灾害研究"资助(No.201211096)

摘　　要：已有的地表调查和GPS位移测量、深部震源机制等研究结果表明,郯庐断裂山东段现今活动性表现为顺时针压扭性活动特征。为揭示郯庐(郯城-庐江)断裂带山东段地表和深部之间地壳浅表层日本大地震发生后的现今地应力状态和活动特征,在鲁东北部花岗岩地区开展了600 m的钻探工程与地应力测量工作。钻探岩芯编录初步揭示地壳浅表层岩体结构特征,随深度系统的地应力测量结果表明,现今水平主应力起主导作用,易于断层走滑作用发生,且现今最大水平主应力方向为近东西向,反映出郯庐断裂带山东段现今活动特征为压性兼右旋走滑,与地表和深部已有研究成果相吻合。研究成果为郯庐断裂带山东段现今活动性研究补充了新的资料。Analysis of earth surface displacement using GPS and deep focal mechanism show that present activity in the Shandong segment of Tan-Lu （Tancheng-Lujiang） fracture zone exhibit a clockwise compression-torsion characteristics in between the shallow earth crust and deep zone of the region after the 2008 Japan earthquake. Data was gathered from 25 in-situ stress sensors installed at varying intervals along the total depth of single 600 m borehole located inside a granite rich region at the northeast part of Shandong. Combined with in-situ stress data, core sampling of the structural features of shallow earth ＂crust rock formations reveals that current horizontal principal stresses play a leading role in strike-slip fault activity. Moreover, measured maximum principle in-situ stress mechanics trend towards the east-west direction and reflects present compressive properties, with dextral slip activity, of the Shandong segment. Including pre-existing data of surface and subterranean experiments, this new data will allow us to open new research avenues for understanding the present active features of the Shandong segment of the Tan-Lu fracture belt.

关 键 词：郯庐断裂带 水压致裂 地应力测量 库仑准则 走滑断层 

分 类 号：TV554[水利工程—水利水电工程]