| 构皮滩水电站坝区节理特征及对区域构造应力场的指示 |
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| 引用本文： | 王令占,侯光久,陈文理.构皮滩水电站坝区节理特征及对区域构造应力场的指示[J].贵州地质,2005,22(4):289-295. |
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| 作者姓名： | 王令占 侯光久 陈文理 |
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| 作者单位： | 1. 中国地质大学地球科学学院,湖北,武汉,430074
2. 长江勘测规划设计研究院,湖北,武汉,430010 |
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| 基金项目： | 长江水利委员会“乌江构皮滩电站裂隙系统及愈合行为研究”项目（No.101-056050） |
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| 摘 要： | 在区域上广泛分布并具有一致方位的节理，可用来恢复区域构造应力场的状态及其演化过程。通过对乌江构皮滩水电站坝区地层中所发育节理系统的方位、几何样式、充填情况、序列关系等特征的详细观察和分析，发现坝区的节理系统具有三组优势方位：走向NNE。倾向NWW（第一组）、走向NWW。倾向NNE（第二组）、走向NWW，倾向SSW（第三组）；而且第一组节理形成最早，第三组节理形成其次，第二组节理形成最晚。根据节理系统与应力的各种关系，结合研究区的区域构造演化，认为NNE向节理主要为燕山运动期的产物，并且在后期构造运动中有多次活动，而NWW向节理主要为喜山运动期和新构造运动期的产物。通过对节理系统中方解石脉e双晶的统计，求得燕山早期坝区古应力为111～142MPa。燕山中期坝区古应力为50-83MPa，燕山晚期或喜山早期坝区古应力为52～77MPa。节理系统的发育特征反映了燕山运动以来区域构造应力场主要以近NNW-E-W向的挤压为主，而古应力的变化则反映了燕山运动以来构造活动逐渐减弱。
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| 关 键 词： | 节理 区域构造应力场 古应力 乌江构皮滩 |
| 文章编号： | 1000-5943(2005)04-0289-06 |
| 收稿时间： | 2005-03-28 |
| 修稿时间： | 2005年3月28日 |
Characteristics of Joints in the Dam Area of the Goupitan Hydropower Station and Its Implication to Regional Stress Field |
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| WANG Ling-zhan,HOU Guang-jiu,CHEN Wen-li.Characteristics of Joints in the Dam Area of the Goupitan Hydropower Station and Its Implication to Regional Stress Field[J].Guizhou Geology,2005,22(4):289-295. |
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| Authors: | WANG Ling-zhan HOU Guang-jiu CHEN Wen-li |
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| Institution: | 1 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 ; 2 Changjiang Surcey, Plan and Design Institute, Wuhan 430010 |
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| Abstract: | The joints,regionally characterized by consistency of orientation over wide area,can be used to reconstruct paleostress state and its evolution.Detailed observations and analysis on the orientations,geometrical patterns,filling states,sequences of joint system in the dam area of Goupitan hydropower station of Wujiang show that,it has three preferred orientations of: NNE-striking and NWW-dipping(the first set),NWW-striking and NNE-dipping(the second set),and NWW-striking and SSW-trending(the third set). The third set formed earlier than the second one but later than the first.According to the relationships between joint system and stress,the NNE-SSW joints are inferred to form in the phase of Yanshanian movement,while NWW-EES joints are interpreted as deformation of Himalayan Movement and Neotectonic movement.The method of statistic of calcite e-twin is used to calculate the palaeostress;the palaeostress of the dam area in the Early Yanshanian Period is 111-142MPa,500-83MPa in the Metaphase Yanshanian Period and 52-77MPa in the late Yanshanian Period.The characteristics of joint system shows that the orientations of maximum principal compressive stress of the study area is mainly between E-W-NNW,and the change of palaeostress indicate the tectonic movement was gradually weaken. |
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| Keywords: | joints regional tectonic stress field palaeostress Wujiang Goupitan |
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