Influence of Preconsolidation on the Shear Strength of the Soft Soil in Floodplain Facies of Yangtze River

Cui Zhipeng; Yan Gang; Wang Jun; Zhong Ping; Wang Zhenxiang; Wu Qi

doi:10.3969/j.issn.1007-2993.2024.01.021

Volume 38 Issue 1

Feb. 2024

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Article Navigation > GEOTECHNICAL ENGINEERING TECHNIQUE > 2024 > 38(1): 116-120

Cui Zhipeng, Yan Gang, Wang Jun, Zhong Ping, Wang Zhenxiang, Wu Qi. Influence of Preconsolidation on the Shear Strength of the Soft Soil in Floodplain Facies of Yangtze River[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(1): 116-120. doi: 10.3969/j.issn.1007-2993.2024.01.021

Citation:

Cui Zhipeng, Yan Gang, Wang Jun, Zhong Ping, Wang Zhenxiang, Wu Qi. Influence of Preconsolidation on the Shear Strength of the Soft Soil in Floodplain Facies of Yangtze River[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(1): 116-120. doi: 10.3969/j.issn.1007-2993.2024.01.021

Citation:

Cui Zhipeng, Yan Gang, Wang Jun, Zhong Ping, Wang Zhenxiang, Wu Qi. Influence of Preconsolidation on the Shear Strength of the Soft Soil in Floodplain Facies of Yangtze River[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(1): 116-120. doi: 10.3969/j.issn.1007-2993.2024.01.021

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Influence of Preconsolidation on the Shear Strength of the Soft Soil in Floodplain Facies of Yangtze River

doi: 10.3969/j.issn.1007-2993.2024.01.021

Cui Zhipeng^{1, 2
,},
Yan Gang^{1, 2
,
,},
Wang Jun^{1, 2},
Zhong Ping^{1, 2},
Wang Zhenxiang^{1, 2},
Wu Qi^{2, 3}

1.
The 1st Geological Brigade of Jiangsu Geology and Mineral Exploration Bureau, Nanjing 210041, Jiangsu, China
2.
Total Factor Testing Laboratory of Engineering Technology Innovation Center of Urban Underground Space Exploration and Evaluation, Ministry of Natural Resources, Nanjing 210041, Jiangsu, China
3.
Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China

Received Date: 2023-02-24
Accepted Date: 2023-07-14
Rev Recd Date: 2023-05-08
Publish Date: 2024-02-05

Abstract

Abstract

The consolidation fast shear test is an important method to obtain the consolidation and undrained shear strength of soft soil, and the soft soil of the Yangtze floodplain has the characteristics of high compressibility, large pore ratio, high moisture content, low permeability, and long consolidation time, which seriously affects the production efficiency of soft soil consolidation fast shear test. To study the effect of preconsolidation on the shear strength of the Yangtze River floodplain facies soft soil and explore the method to improve the efficiency of fast shear tests for consolidation of floodplain soft soil, a series of consolidation and shear tests were carried out, taking the Nanjing Yangtze River floodplain soft soil as the research object. The results show that the Yangtze River floodplain facies soft soil is a kind of soft soil with rapid consolidation in the early stage and stable and slow consolidation in the later stage. The consolidation degree can reach 95% when consolidating for 25 minutes, while it takes 5～8 hours to fully consolidate and stabilize. The shear strength of soft soil increased with the increase of consolidation degree U, and its growth rate gradually slowed down. The increase of shear strength with the increase of U under each load condition was basically the same. When the degree of consolidation is 70%～80%, its shear strength reaches 90%～95% of that when fully consolidated. This study can provide a reference for improving the fast shear test method of soft soil consolidation.
- floodplain facies soft soil,
- preconsolidation,
- degree of consolidation,
- consolidation time,
- shear strength

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Influence of Preconsolidation on the Shear Strength of the Soft Soil in Floodplain Facies of Yangtze River

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Influence of Preconsolidation on the Shear Strength of the Soft Soil in Floodplain Facies of Yangtze River

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