Stability Analysis of Tunnel Upward-slope in Marshy Soil Layer of High Altitude and Cold Region

Keyan Zhao ； Xiaochuan Wang ； Haonan Yang

《International Core Journal of Engineering》 8卷9期 (2022/09) Pp. 29-33

https://doi.org/10.6919/ICJE.202209_8(9).0006

摘要

It is very important to control the stability of upward-slope during excavation. In this paper, finite element numerical simulation software is used to analyze the distribution of plastic zone and the increment of horizontal and vertical displacement of upward-slope during excavation, so as to evaluate the stability of slope during excavation. The results show that as the plastic zone area of the upward-slope continues to expand, the plastic zone area reaches the maximum after the completion of the upward-slope excavation, and the upper and lower parts of the slope tend to be transfixed from the high terrain to the low terrain plastic zone. After the completion of the upward-slope excavation, a new face is formed, and a large displacement is generated from the upward-slope to the direction of the face. The maximum displacement is mainly concentrated in the upper left of the upward-slope, and a large uplift occurs at the bottom of the slope platform. The maximum horizontal displacement of the left slope is mainly concentrated near the second and third grade slopes, and the maximum horizontal displacement is about 4cm. The maximum horizontal displacement of the right slope is mainly concentrated at the first grade slope, namely the foot of the slope, and the maximum horizontal displacement is about 4cm.

關鍵字

High Altitude Cold Region ； Marshy Soil Layer ； Transfixion of Plastic Zone ； Stability

參考文獻

H Ma. High slope classification scheme of excavation unloading study [J]. Journal of traffic in the north, 2018 (7) : 114-118. The DOI: 10.15996 / j.carol carroll nki BFJT. 2018.07.030.

X J LI. Numerical simulation and safety analysis of deep foundation pit slope excavation and support for underground tunnel [J]. Journal of safety and the environment: 1-9 [2022-04-08]. DOI: 10.13637 / j.i SSN. 1009-6094.2021.1973.

A S Zhang,Y D Wei. Sichuan Cement,2019(07):310-311. (in Chinese).

B XIONG. Simulation and stability evaluation of slope excavation based on ANSYS software.[J]. Prospecting engineering (rock and soil drilling and excavation engineering), 2009,36(02):64-68.

C R Tan,S X Liang,Y P Dong, et al. Study on supporting effect of side slope in loose rock pile tunnel construction [J]. Highway,2020,65(11):366-372.