| 龙门山断裂带的性质与活动性研究 |
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| 引用本文： | 安其美,丁立丰,王海忠,赵仕广.龙门山断裂带的性质与活动性研究[J].大地测量与地球动力学,2004,24(2):115-119. |
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| 作者姓名： | 安其美 丁立丰 王海忠 赵仕广 |
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| 作者单位： | 中国地震局地壳应力研究所,北京,100085 |
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| 摘 要： | 沿龙门山构造带两侧，在9个100～500m深的钻孔中进行了水压致裂地应力测量，获得了断裂带两侧地表浅部构造应力的大小、方向和分布特征。据这些实测的应力资料，用库仑摩擦滑动准则分段研究了断裂带的性质和活动性。结果表明：试验得到的摩擦强度(0．6～1．0)似乎适用于浅部断层构造，地壳浅部地应力的大小和方向与断裂的性质及活动性密切相关，应力状态与断裂带的逆冲性质相一致；在断裂带东段的广元地区．中段的平武、汶川和茂县地区，实测的最大水平主应力值达不到逆断层活动要求的临界状态；而西段与鲜水河断裂带、南北向构造带复合部位的二郎山地区，现今构造应力状态比较复杂．实测的最大水平主应力值满足逆断层活动要求的临界状态。
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| 关 键 词： | 龙门山断裂带 地应力测量 应力状态 摩擦滑动 水压致裂 |
| 文章编号： | 1671-5942(2004)02-0115-05 |
| 修稿时间： | 2004年1月5日 |
RESEARCH OF PROPERTY AND ACTIVITY OF LONGMEN MOUNTAIN FAULT ZONE |
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| An Qimei,Ding Lifeng,Wang Haizhong and Zhao Shiguang.RESEARCH OF PROPERTY AND ACTIVITY OF LONGMEN MOUNTAIN FAULT ZONE[J].Journal of Geodesy and Geodynamics,2004,24(2):115-119. |
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| Authors: | An Qimei Ding Lifeng Wang Haizhong and Zhao Shiguang |
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| Abstract: | Along the two side of Longmen mountain fault zone the ground stress measurement with hydraulic fracturing in 9 boreholes whose depthes within 100 to 500 meters was carried out and the magnitude and direction and distributed characters of shallow surface tectonic stress have known well.On the basis of the stress data and according to Coulombs frictional sliding law, we have researched the fault activity in sections and concluded that the frictional strength value(0.6 to 1.0) is likely for fault tectonics on shallow surface.The magnitude and direction of ground stress is closely related to fault property and fault activity and the stress state of the fault is consistent with its thrust attribute. The measured maximum major horizontal principal stress does not reach the critical state for the thrust sliding in Guangyuan region(in east section of fracture zone) and Pinwu, Wenchuan, Maoxian regions (in the middle section of fracture zone). However in the Erlangshan region which is the compound position of the west section of this fault zone with Xianshuihe fault and North-South Tectonic Zone, the recent tectonic stress state is comparatively complex, the measured maximum major horizontal principal stress has reached the critical state, and it is favourable to the activty of thrust fault. |
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| Keywords: | Longmen mountain fault zone ground stress measurement stress state frictional sliding hydraulic fracturing |
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