Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of China
Carbonaceous rock is a special soft rock containing TOC organic carbon 6%∼40%. In order to reveal the influence of engineering characteristics of carbonaceous rock on the engineering construction, firstly the stratigraphic distribution of carbonaceous Rocks in Guangxi is investigated, and the geneti...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8810648 |
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| author | Junhui Luo Yong Wu Decai Mi Qiongyao Ye Haifeng Huang Zhenchao Chang Qinglin Chen Tao Zhang Guanhua Sun Xueheng Wang Yu Wang Xianlin Liu |
| author_facet | Junhui Luo Yong Wu Decai Mi Qiongyao Ye Haifeng Huang Zhenchao Chang Qinglin Chen Tao Zhang Guanhua Sun Xueheng Wang Yu Wang Xianlin Liu |
| author_sort | Junhui Luo |
| collection | DOAJ |
| description | Carbonaceous rock is a special soft rock containing TOC organic carbon 6%∼40%. In order to reveal the influence of engineering characteristics of carbonaceous rock on the engineering construction, firstly the stratigraphic distribution of carbonaceous Rocks in Guangxi is investigated, and the genetic mechanism and tectonic environment of carbonaceous rocks are discussed. Secondly, the influence of pore microstructure on the disintegration characteristics of carbonaceous rocks is analyzed. The role of geochemical characteristics of carbonaceous rocks (mineral composition, TOC total organic matter content, and type) on engineering properties is revealed. Finally, combined with the distribution, structure, microstructure, and microscopic characteristics of the previous studies, the disintegration mechanism of carbonaceous rocks in water swelling and heat dehydration is discussed. The results are as follows. (1) Carbonaceous rocks in Guangxi are mainly distributed in Devonian, Carboniferous, and Cambrian systems. It is mainly formed in anoxic and reductive deep water basins, slopes, and relatively confined coastal lagoons and swamps. The carbonaceous rocks in the Devonian Luofu formation are most typical. (2) The pores of carbonaceous rocks are divided into mineral pores, organic matter pores, and microfracture, which are mainly mineral pores. The more developed pores in mineral pores are intragranular dissolved pores. Secondly, mineral intergranular pores and a small amount of intergranular dissolution pores and less inner pores. Organic matter porosity increases with the increase of shale organic carbon content and maturity, but the shale porosity and adsorption capacity decrease when shale maturity reaches more than 2.4%. (3) Clay minerals in carbonaceous shale mainly consist of illite and illite/montmorillonite layer, which have water swelling and heat dehydration. The total average value of TOC (total organic matter content) is more than 1%, which belongs to carbonaceous rocks of medium high grade hydrocarbon source rocks. Organic matter is mainly dominated by type I and II1-II2 type with large hydrocarbon generating potential, which is prone to oxidation-reduction reaction and cause rock disintegration. |
| format | Article |
| id | doaj-art-81caaf4f4a3f4b5dacf64d43a4ccfb9c |
| institution | OA Journals |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-81caaf4f4a3f4b5dacf64d43a4ccfb9c2025-08-20T02:09:05ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88106488810648Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of ChinaJunhui Luo0Yong Wu1Decai Mi2Qiongyao Ye3Haifeng Huang4Zhenchao Chang5Qinglin Chen6Tao Zhang7Guanhua Sun8Xueheng Wang9Yu Wang10Xianlin Liu11Guangxi Xinfazhan Communications Group Co., Ltd., Nanning, Guangxi 530029, ChinaGuangxi Communication Design Group Co., Ltd., Nanning, Guangxi 530029, ChinaGuangxi Communication Design Group Co., Ltd., Nanning, Guangxi 530029, ChinaGuangxi Communication Design Group Co., Ltd., Nanning, Guangxi 530029, ChinaGuangxi Beitou Transportation Maintenance Technology Group Co., Ltd., Nanning, Guangxi 530029, ChinaGuangxi Beitou Transportation Maintenance Technology Group Co., Ltd., Nanning, Guangxi 530029, ChinaGuangxi Beitou Transportation Maintenance Technology Group Co., Ltd., Nanning, Guangxi 530029, ChinaFaculty of Engineering, China University of Geosciences, Wuhan 430074, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, ChinaGuangxi Institute of Geological Survey, Nanning, Guangxi 530023, ChinaGuangxi Road and Bridge Engineering Group Co., Ltd., Nanning, Guangxi 530200, ChinaGuangxi Communication Design Group Co., Ltd., Nanning, Guangxi 530029, ChinaCarbonaceous rock is a special soft rock containing TOC organic carbon 6%∼40%. In order to reveal the influence of engineering characteristics of carbonaceous rock on the engineering construction, firstly the stratigraphic distribution of carbonaceous Rocks in Guangxi is investigated, and the genetic mechanism and tectonic environment of carbonaceous rocks are discussed. Secondly, the influence of pore microstructure on the disintegration characteristics of carbonaceous rocks is analyzed. The role of geochemical characteristics of carbonaceous rocks (mineral composition, TOC total organic matter content, and type) on engineering properties is revealed. Finally, combined with the distribution, structure, microstructure, and microscopic characteristics of the previous studies, the disintegration mechanism of carbonaceous rocks in water swelling and heat dehydration is discussed. The results are as follows. (1) Carbonaceous rocks in Guangxi are mainly distributed in Devonian, Carboniferous, and Cambrian systems. It is mainly formed in anoxic and reductive deep water basins, slopes, and relatively confined coastal lagoons and swamps. The carbonaceous rocks in the Devonian Luofu formation are most typical. (2) The pores of carbonaceous rocks are divided into mineral pores, organic matter pores, and microfracture, which are mainly mineral pores. The more developed pores in mineral pores are intragranular dissolved pores. Secondly, mineral intergranular pores and a small amount of intergranular dissolution pores and less inner pores. Organic matter porosity increases with the increase of shale organic carbon content and maturity, but the shale porosity and adsorption capacity decrease when shale maturity reaches more than 2.4%. (3) Clay minerals in carbonaceous shale mainly consist of illite and illite/montmorillonite layer, which have water swelling and heat dehydration. The total average value of TOC (total organic matter content) is more than 1%, which belongs to carbonaceous rocks of medium high grade hydrocarbon source rocks. Organic matter is mainly dominated by type I and II1-II2 type with large hydrocarbon generating potential, which is prone to oxidation-reduction reaction and cause rock disintegration.http://dx.doi.org/10.1155/2020/8810648 |
| spellingShingle | Junhui Luo Yong Wu Decai Mi Qiongyao Ye Haifeng Huang Zhenchao Chang Qinglin Chen Tao Zhang Guanhua Sun Xueheng Wang Yu Wang Xianlin Liu Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of China Advances in Civil Engineering |
| title | Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of China |
| title_full | Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of China |
| title_fullStr | Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of China |
| title_full_unstemmed | Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of China |
| title_short | Analysis of the Distribution and Microscopic Characteristics and Disintegration Characteristics of Carbonaceous Rocks: A Case Study of the Middle Devonian Luofu Formation in Western Guangxi of China |
| title_sort | analysis of the distribution and microscopic characteristics and disintegration characteristics of carbonaceous rocks a case study of the middle devonian luofu formation in western guangxi of china |
| url | http://dx.doi.org/10.1155/2020/8810648 |
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