Research on the reasonable pile spacing of micro pile composite soil nailing

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Liu, Jun Yan^1,2 ; Liu, Yan^1,2 ; Song, Xiang Hua^1,2

School of Civil Engineering and Architecture, University of Jinan, Jinan

250022, China^1

Eng. Technol. Res. Ctr. for Urban Underground Eng. Supporting and Risk Monitoring of Shandong Prov., China^2

关键词: Composite soil nailing;    Composite support;    Design and construction;    Displacement field;    Numerical simulation software;    Sliding surface;    Supporting effect;    Synergetic effect;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012157/pdf
DOI  :  10.1088/1755-1315/81/1/012157

来源: IOP

【 摘 要 】

Through the numerical simulation software FLAC3D, study on the synergetic effect of micro pile composite soil nailing will be studied. By adjusting the micro pile spacing and analysing the displacement field and stress field of soil, we can find that supporting effect of the soil nail hasn't work yet when the micro pile spacing is 2D. The soil arching between piles has been formed in the pile spacing 4D ∼ 6D. The composite effect of micro pile and soil nailing will be the best and the soil arch behind piles will be firstly formed in 6D, the horizontal saddle soil arch will be formed between the nails. The nail head coincidence pressure area and micro pile pressure area are overlapping to maintain stability in the soil between piles. When the micro pile spacing is 9D, the arch behind piles will be failure, the soil flows around, but the saddle arch between the nails into circular arch, the supporting effect of the soil nailing is enhanced. When the micro pile spacing is 12D, the arch of the nails becomes smaller, sliding surface appears primitively. Based on the conclusions above, it is suggested that the micro pile spacing between 2D ∼ 6D is suitable for the micro pile and soil nailing composite support. The conclusion can provide theoretical basis for the design and construction of micro pile composite soil nailing.