Abstract
Deformation control of fill subgrade is a difficult point in the field of highway engineering. This article relies on the treatment project of micro-piles for subgrade deformation of K555 + 070～K557 + 710 section of Qingdao-Yinchuan Expressway. Settlement and stress monitoring was carried out at the toe of the roadbed, the shoulder, and the center of the roadbed. We use Midas/GTS modeling trial calculation. A new method to check the simulation results of the deviation rate is proposed. A calculation model of the stress and deformation of the subgrade in the whole life cycle is established. The results of comparative analysis, monitoring, and simulation are as follows. ① The compression and consolidation of the fill account for most of the settlement and deformation of the roadbed in the whole life cycle. ② Subgrade center settlement is the sensitive part of subgrade deformation. ③ After piles are added, the deformation extremes at the toe of the slope, the shoulder, and the center of the roadbed are all reduced by more than 96%. The research results can provide theoretical guidance for the analysis of the stress and deformation characteristics of the subgrade before and after the micro-pile treatment.
Highlights
A micro-anti-slide pile— known as a “micro-pile”—is a small anti-slide pile with a diameter of less than 300 mm that can be constructed by drilling a hole, reinforcing the structure, and filling the hole by pressure grouting
As micro-piles are easy and quick to construct and can be flexibly positioned according to the needs of the project, they are widely used in slope engineering projects for reinforcement and slip prevention [1,2,3,4]. ough micro-piles were initially used for foundation reinforcement, they have more recently been applied to a variety of advanced engineering projects including landslide treatment and deep foundation pit support [5,6,7]
The ability to construct micro-piles rapidly is valuable in emergency projects, such as those for landslide treatment; micro-piles offer an advantage over traditional anti-slide piles as they can be constructed with less disturbance to the slope
Summary
A micro-anti-slide pile— known as a “micro-pile”—is a small anti-slide pile with a diameter of less than 300 mm that can be constructed by drilling a hole, reinforcing the structure, and filling the hole by pressure grouting. Zhu et al [15] found through experiments that the horizontal bearing capacity of a micro-pile is directly related to the type of slope rock and soil in which it is embedded in addition to the conventionally considered parameters—pile section, flexural rigidity, and pile layout. Is study aims to address this challenge by researching the micro-pile treatment of the filled subgrade along the K555 + 070 to K557 + 710 section of the Qingdao-Yinchuan Expressway. To this end, the deformation and stress of the subgrade were monitored and Midas/GTS software was used to create and validate a numerical simulation of this project based on the monitoring data
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