Comparison analysis of the impact of soft ground improvement construction on existing railways near newly constructed lines

HE Xiao; WANG Weizhi; XU Yongfu; WANG Hu; YANG Yuanzhi; YANG Weilin; AO Jiangzhong; XIAN Yi; NI Shuntian; YE Huayang

doi:10.16030/j.cnki.issn.1000-3665.202211054

2024 Vol. 51, No. 1

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Article navigation > Hydrogeology & Engineering Geology > 2024 > 51(1): 111-122

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HE Xiao, WANG Weizhi, XU Yongfu, WANG Hu, YANG Yuanzhi, YANG Weilin, AO Jiangzhong, XIAN Yi, NI Shuntian, YE Huayang. Comparison analysis of the impact of soft ground improvement construction on existing railways near newly constructed lines[J]. Hydrogeology & Engineering Geology, 2024, 51(1): 111-122. doi: 10.16030/j.cnki.issn.1000-3665.202211054

Citation:

HE Xiao, WANG Weizhi, XU Yongfu, WANG Hu, YANG Yuanzhi, YANG Weilin, AO Jiangzhong, XIAN Yi, NI Shuntian, YE Huayang. Comparison analysis of the impact of soft ground improvement construction on existing railways near newly constructed lines[J]. Hydrogeology & Engineering Geology, 2024, 51(1): 111-122. doi: 10.16030/j.cnki.issn.1000-3665.202211054

Comparison analysis of the impact of soft ground improvement construction on existing railways near newly constructed lines

1.
Xiaoyong Railway Co. Ltd., Ningbo, Zhejiang　315010, China
2.
Shanghai Railway Key Project Construction Headquarters, Shanghai　200071, China
3.
Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai　200240, China
4.
Construction Headquarter of Nanjing Railway Key Project, Nanjing, Jiangsu　210031, China
5.
China Railway Erju Group Corporation, Chengdu, Sichuan　610031, China

More Information

Corresponding author: XU Yongfu, yongfuxu@sjtu.ed.cn

Received Date: 17 November 2022

Revised Date: 15 January 2023

Publish Date: 15 January 2024

Abstract

Abstract

In the southeast coastal area of China, existing railway lines, constructed long ago with low construction standards for railway subgrades, face significant impacts from the construction of soft ground improvement for newly built railway lines. Through on-site monitoring of foundation treatment construction, it is crucial to select the soft ground improvement method with minimal construction impact to ensure the operation safety of the existing railway. Based on the on-site monitoring data of the excess pore water pressure, surface displacement, and deep displacement in the construction of soft ground improvement, the study assesses the extent and magnitude of construction impact. The key findings include: (1) Ranking of construction impact magnitude: High-pressure jet grouting column (pipe pile) > deep cement mixing column > MJS column > geosynthetic reinforced column; (2) Construction impact range: deep cement mixing column, high-pressure jet grouting column, geosynthetic reinforced column and MJS column are about 5 m, 10 m, 3 m and 4 m, respectively. The construction disturbance of high-pressure jet grouting pile, pipe pile, polymer bag grouting pile and deep cement mixing column are compared based on the differences of excess pore water pressure, surface displacement, deep displacement and construction disturbance range. It is provided a basis for comparison and selection of schemes for soft ground improvement of new railway lines adjacent to existing railways. This optimization effectively controls the construction disturbance of the soft ground treatment of the new line and ensures the safety of the existing railway.
- railway line /
- soft ground improvement /
- construction disturbance /
- deep cement mixing column /
- high-pressure jetgrouting column /
- geosynthetic reinforced column /
- MJS column

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References

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