Critical application zone of the jet grouting piles in the vicinity of existing high-speed railway bridge in deep soft soils with medium sensibility

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-12-18 DOI:10.1016/j.sandf.2023.101407

Yao Shan , Jun Luo , Binglong Wang , Shunhua Zhou , Bo Zhang

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Abstract

Jet grouting piles were widely employed for ground reinforcement in building and infrastructure engineering due to the low cost and construction convenience. However, this foundation treatment method is not allowed to be used in high-speed railway involved constructions in China because of the concerning of the negative effect on the lateral displacement of the existing high-speed railway. To find a reasonable application distance of jet grouting piles away from existing high-speed railway bridge in deep soft soils with medium sensibility, a series of laboratory and in-situ tests on the influence of the jet grouting piling on the deformation of surrounding soils and adjacent high-speed railway bridge are carried out. The geological characteristics of the construction site and the mechanical properties of the soft soil are deeply investigated by utilizing field and laboratory tests. The piling induced lateral displacement of the surrounding soils is monitored as well as the displacement of an adjacent high-speed railway bridge. The monitoring data reveal that the influence area of the jet grouting piling is approximately 1.75 ∼ 1.85 times of the pile length in deep soft soils. The critical distance of the jet grouting piles from the existing high-speed bridge should be larger than 2 times of the pile length.

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既有高速铁路桥附近深厚软土（中等敏感性）中喷射注浆桩的临界应用区

喷射灌注桩由于成本低、施工方便，被广泛应用于建筑和基础设施工程的地基加固。然而，由于担心对既有高速铁路的侧向位移产生负面影响，这种地基处理方法在中国的高速铁路建设中不被允许使用。为了找到喷射注浆桩在中等感度深厚软土中远离既有高速铁路桥梁的合理应用距离，对喷射注浆桩对周围土体及相邻高速铁路桥梁变形的影响进行了一系列实验室和现场试验。通过现场和实验室试验，深入研究了施工现场的地质特征和软土的力学性能。监测了打桩引起的周围土壤横向位移以及相邻高速铁路桥梁的位移。监测数据显示，在深层软土中，喷射注浆桩的影响范围约为桩长的 1.75 ～ 1.85 倍。喷射注浆桩与既有高速桥梁的临界距离应大于桩长的 2 倍。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.