Abstract
In order to study the deformation stability of rock slope during the excavation of cutting slope and ensure the safety of rock slope during construction and operation period, this article analyzed the deformation law of a typical slope excavation by monitoring the surface deformation and the internal displacement of the rock mass. The surface deformation of the slope is monitored by setting monitoring points, and the internal deformation of the slope is monitored by installing multipoint displacement meters and inclinometers. Therefore, the relationship between slope excavation and deformation is obtained. The analysis of monitoring results shows that the slope is stable before excavation, and the displacement of the slope is gradually increased with the slope excavation. After the excavation, the displacement of each slope tends to converge. The maximum displacement in surface monitoring points is 12.30 mm, and the displacement parallels to the direction of the expressway. The maximum vertical displacement in surface monitoring points is 10.60 mm which occurred in the third step; the maximum internal displacement is 11.02 mm which mainly occurs in the weak structural plane of the rock boundary. During the excavation of the weak rock slope, the slope rock mass is prone to large displacement deformation. After the excavation, the slope surface displacement and internal displacement tend to converge in a short time.
Highlights
Highway reconstruction and expansion becomes one of the methods improving highway transportation capability, and the issue is followed by excavation of original high slopes
The objective of this article is to present a case study of field monitoring on the deformation of high rock slope during highway construction, in which the surface deformation and the internal displacement of rock mass were recorded and analyzed
Based on the data of horizontal displacement monitoring, it can be viewed that the silty clay layer on the slope top presents the potential safety hazard of overall slide down the rock lower soft structural plane
Summary
With the development of highway and transportation industries, traffic flow is larger and larger, and traffic loads of some roads have gradually surpassed their original capacities.[1,2,3] Highway reconstruction and expansion becomes one of the methods improving highway transportation capability, and the issue is followed by excavation of original high slopes. To guarantee safe slope excavation and stable operation, monitoring and analysis of a slope is necessary.[9,10,11,12,13] In recent years, many experts and scholars have obtained many good research developments in monitoring systems.[14,15,16,17,18,19,20] Barsocchi et al.[21] proposed a structural monitoring system by Internet-of-Things wireless sensing devices to monitor their state of health of the buildings. Many new approaches for prediction of the stability of rock slopes are used in the recent year.[37,38,39,40,41,42,43] In this article, a high slope in the Nantang Wenzhou-Huanghua section of the complex line of the Ningbo-Taizhou-Wenzhou expressway in Zhejiang Province is investigated. Common methods for slope monitoring and measurement are used for stability monitoring and analysis during the excavation of the slope, and the safety of the slope is assessed from multiple aspects
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