Permeability Heterogeneity in a Fractured Sandstone–Mudstone Rock Mass in Xiaolangdi Dam Site, Central China |
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作者姓名: | JIANG Xiaowei WAN Li WANG Xusheng KANG Aibin HUANG Jun and HUANG Guoxing |
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作者单位: | 1 School of Water Resources and Environment, China University of Geosciences, Beijing 100083; 2 Research Center of Tunneling and Underground Engineering, Beijing Jiaotong University, Beijing 100044; 3 China Highway Planning and Design Institute Consultant |
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基金项目: | The financial support by the National Natural Science Foundation of China (No. 40528003 and 50639090) is greatly acknowledged. |
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摘 要: | Abstract: Heterogeneity of permeability in fractured media is a hot research topic in hydrogeology. Numerous approaches have been proposed to characterize heterogeneity in the last several decades. However, little attention has been paid to correlate permeability heterogeneity with geological information. In the present study, several causes of permeability heterogeneity, that is, lithology, tectonism, and depth, are identified. The unit absorption values (denoted as ω), which are results obtained from the packer test, are employed to represent permeability. The variability of permeability in sandstone–mudstone is so significant that the value of unit absorptions span 3–4 orders of magnitude at any depth with several test sections. By declustering, it has been found that under a similar tectonic history, the means of permeability differ greatly at different formations as a result of different mudrock contents. It has also been found that in the same formation, permeability can be significantly increased as a result of faulting. The well-known phenomenon, the decrease in permeability with depth, is found to be caused by the fractures in the rock mass, and the relationship between permeability and depth can be established in the form of logω–logd. After subtracting the trend of ω with absolute depth, the mean of the residual value at each relative depth can be well correlated with the distribution of mudstone. The methods proposed in this paper can be utilized to research in similar study areas.
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关 键 词: | y words: fractured media permeability heterogeneity declustering distribution of mudstone |
收稿时间: | 2009/9/22 0:00:00 |
修稿时间: | 2009/10/9 0:00:00 |
Permeability Heterogeneity in a Fractured Sandstone-Mudstone Rock Mass in Xiaolangdi Dam Site,Central China |
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Authors: | JIANG Xiaowei WAN Li WANG Xusheng KANG Aibin HUANG Jun HUANG Guoxing School of Water Resources Environment China University of Geosciences Beijing Research Center of Tunneling Underground Engineering Beijing Jiaotong University Beijing China Highway Planning Design Institute Consultants Beijing |
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Institution: | [1]School of Water Resources and Environment, China University of Geosciences, Beijing 100083 [2]Research Center of Tunneling and Underground Engineering, Beijing Jiaotong University, Beijing 100044 [3]China Highway Planning and Design Institute Consultants, Beijing 100010 |
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Abstract: | Heterogeneity of permeability in fractured media is a hot research topic in hydrogeology. Numerous approaches have been proposed to characterize heterogeneity in the last several decades. However, little attention has been paid to correlate permeability heterogeneity with geological information. In the present study, several causes of permeability heterogeneity, that is, lithology, tectonism, and depth, are identified. The unit absorption values (denoted as ω), which are results obtained from the packer test, are employed to represent permeability. The variability of permeability in sandstone–mudstone is so significant that the value of unit absorptions span 3–4 orders of magnitude at any depth with several test sections. By declustering, it has been found that under a similar tectonic history, the means of permeability differ greatly at different formations as a result of different mudrock contents. It has also been found that in the same formation, permeability can be significantly increased as a result of faulting. The well‐known phenomenon, the decrease in permeability with depth, is found to be caused by the fractures in the rock mass, and the relationship between permeability and depth can be established in the form of logω–logd. After subtracting the trend of ω with absolute depth, the mean of the residual value at each relative depth can be well correlated with the distribution of mudstone. The methods proposed in this paper can be utilized to research in similar study areas. |
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Keywords: | fractured media permeability heterogeneity declustering distribution of mudstone |
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