Abstract
This paper presents the results of the stability analysis of a deposit slope with an artificial scarp in a tunnel exit and an evaluation of the effectiveness of four proposed reinforcement schemes. A typical slope section was used to study the deposit slope stability and retaining mechanisms of the reinforcement systems. A series of two‐dimensional (2D) finite element models (FEM), combined with a strength reduction technique, was established using the Phase2 software. According to field monitoring results, the horizontal displacements of the front, middle, and rear of the slope decreased gradually, and the safety factor increased successively. The front of the deposit slope was in a state of limit equilibrium as a result of the artificial scarp formed by long‐term manual excavation. Anchors and concrete frame beams provided stress compensation and improve the stability of the deposit slope, and front prestressed anchor cables and stability piles strengthened the mechanical properties of the rock and soil masses and provided resistance at the front of the deposit. Rear stability piles prevented the front of the deposit from being pushed and the middle and rear of the deposit from being pulled and provided resistance at the front of the deposit. The field monitoring also showed that the deformation of the deposit slope was effectively controlled. The study results provide insights into the effectiveness of measures for reinforcing and maintaining the stability of deposit slope with artificial scarps.
Highlights
Over the past few years, transportation facilities have increasingly been extended into mountainous and hilly areas in conjunction with rapid economic and social development [1,2,3,4,5]
The deformation area was located at the front edge of the deformation body of the deposit slope. e anchors and concrete frame beams provided stress compensation for the artificial scarp and restricted the upper soil from continuing to be pulled. us, the analysis shows that the anchors and concrete frame beams significantly improved the stability of the deposit slope
A deposit slope at an exit of the Taihedong tunnel, which is located in the city of Qingyuan in Guangdong Province, China, was analyzed in this study. e deposit slope, with surface cracks, had a scarp formed by a long-term excavation at the toe of the slope and was in a state of limit equilibrium
Summary
Over the past few years, transportation facilities (e.g., railroads and highways) have increasingly been extended into mountainous and hilly areas in conjunction with rapid economic and social development [1,2,3,4,5] During tunnelling in such areas, rock engineers normally encounter the problem of slope stability. Erefore, stability assessment and reinforcement on slope in mountainous regions are the premise for tunnel construction and operation [10]. Stability piles and anchor frame beams are typical reinforcing measures used for large-scale slope engineering. E movement of the deposit slope was monitored during construction, and the field measurements were compared to the numerical analysis results. We were able to perform a comprehensive evaluation of risks associated with the Taihedong tunnel deposit slope with an artificial scarp. We performed a reinforcement system design to ensure the safety of tunnel slope construction and operation
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