Physical and Mechanical Performance of Frozen Rocks and Soil in Different Regions
The artificial freezing method is extensively used in the reinforcement of engineering strata in various regions for shaft excavation and subway connection channels. In this study, representative rock and soil strata from different regions were subjected to low-temperature physical and mechanical pe...
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8867414 |
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| author | Junhao Chen Lexiao Wang Zhaoming Yao |
| author_facet | Junhao Chen Lexiao Wang Zhaoming Yao |
| author_sort | Junhao Chen |
| collection | DOAJ |
| description | The artificial freezing method is extensively used in the reinforcement of engineering strata in various regions for shaft excavation and subway connection channels. In this study, representative rock and soil strata from different regions were subjected to low-temperature physical and mechanical performance tests. The results show that, compared with Cretaceous and Jurassic rock and soil strata, deep topsoil and shallow coastal topsoil have high water content, low thermal conductivities, high frost heave rates, and high freezing temperatures. In addition, the results show that, as the curing temperature decreases, the uniaxial compressive strengths and elastic moduli of deep topsoil and shallow coastal topsoil increase almost linearly. The strength of the sandy soil strata is the highest, followed by the cohesive soil strata, and the strength of the mucky soil and the calcareous clay is the lowest. The strength of the frozen wall and the waterproof requirements must both be taken into account in the freezing design. Deep Cretaceous and Jurassic rocks can have high strength of more than 5 MPa under normal temperature conditions. An increase in the uniaxial compressive strength and elastic modulus with decreasing curing temperature is mainly manifested within the range from the normal temperature to −10°C. The strength can reach more than 10 MPa at −10°C, and only the strength requirements of the frozen wall need to be considered in the freezing design. At low temperatures, deep topsoil and shallow coastal topsoil are dominated by the form of compression failure. The average failure strain at −10°C is typically greater than 5%. When excavating the strata, it is essential to pay attention to the effect of creep. The failure strain of deep Cretaceous and Jurassic rocks is between 1% and 2%, and the breaking and sudden collapse of surrounding rocks should be prevented. |
| format | Article |
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| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
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| series | Advances in Civil Engineering |
| spelling | doaj-art-a0ee2c62142a49499b0afe252352d0c12025-02-03T06:46:57ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88674148867414Physical and Mechanical Performance of Frozen Rocks and Soil in Different RegionsJunhao Chen0Lexiao Wang1Zhaoming Yao2Key Laboratory of Underground Engineering, Fujian Province University, Fuzhou 350118, ChinaSchool of Civil Engineering, Fujian University of Technology, Fuzhou 350118, ChinaKey Laboratory of Underground Engineering, Fujian Province University, Fuzhou 350118, ChinaThe artificial freezing method is extensively used in the reinforcement of engineering strata in various regions for shaft excavation and subway connection channels. In this study, representative rock and soil strata from different regions were subjected to low-temperature physical and mechanical performance tests. The results show that, compared with Cretaceous and Jurassic rock and soil strata, deep topsoil and shallow coastal topsoil have high water content, low thermal conductivities, high frost heave rates, and high freezing temperatures. In addition, the results show that, as the curing temperature decreases, the uniaxial compressive strengths and elastic moduli of deep topsoil and shallow coastal topsoil increase almost linearly. The strength of the sandy soil strata is the highest, followed by the cohesive soil strata, and the strength of the mucky soil and the calcareous clay is the lowest. The strength of the frozen wall and the waterproof requirements must both be taken into account in the freezing design. Deep Cretaceous and Jurassic rocks can have high strength of more than 5 MPa under normal temperature conditions. An increase in the uniaxial compressive strength and elastic modulus with decreasing curing temperature is mainly manifested within the range from the normal temperature to −10°C. The strength can reach more than 10 MPa at −10°C, and only the strength requirements of the frozen wall need to be considered in the freezing design. At low temperatures, deep topsoil and shallow coastal topsoil are dominated by the form of compression failure. The average failure strain at −10°C is typically greater than 5%. When excavating the strata, it is essential to pay attention to the effect of creep. The failure strain of deep Cretaceous and Jurassic rocks is between 1% and 2%, and the breaking and sudden collapse of surrounding rocks should be prevented.http://dx.doi.org/10.1155/2020/8867414 |
| spellingShingle | Junhao Chen Lexiao Wang Zhaoming Yao Physical and Mechanical Performance of Frozen Rocks and Soil in Different Regions Advances in Civil Engineering |
| title | Physical and Mechanical Performance of Frozen Rocks and Soil in Different Regions |
| title_full | Physical and Mechanical Performance of Frozen Rocks and Soil in Different Regions |
| title_fullStr | Physical and Mechanical Performance of Frozen Rocks and Soil in Different Regions |
| title_full_unstemmed | Physical and Mechanical Performance of Frozen Rocks and Soil in Different Regions |
| title_short | Physical and Mechanical Performance of Frozen Rocks and Soil in Different Regions |
| title_sort | physical and mechanical performance of frozen rocks and soil in different regions |
| url | http://dx.doi.org/10.1155/2020/8867414 |
| work_keys_str_mv | AT junhaochen physicalandmechanicalperformanceoffrozenrocksandsoilindifferentregions AT lexiaowang physicalandmechanicalperformanceoffrozenrocksandsoilindifferentregions AT zhaomingyao physicalandmechanicalperformanceoffrozenrocksandsoilindifferentregions |