Open Access

ARTICLE

A Pull-Out Test Study on the Working State of Fully Grouted Bolts

Ruixin Zhao^1,*, Zhongju Feng¹, Guan Jiang¹, Fuchun Wang¹, Yidong Zhang², Changan Zhang³, Zhenbing Wang¹

1 School of Highway, Chang’an University, Xi’an, 710064, China
2 Shandong Hi-speed Group Co., Ltd., Jinan, 250098, China
3 Shandong Provincial Communications Planning and Design Co., Ltd., Jinan, 250031, China

* Corresponding Author: Ruixin Zhao. Email:

Fluid Dynamics & Materials Processing 2021, 17(2), 441-453. https://doi.org/10.32604/fdmp.2021.010595

Received 12 March 2020; Accepted 20 February 2021; Issue published 02 April 2021

Abstract

The present study examines the working conditions of fully grouted bolts used for the construction and expansion of high slopes. On the basis of a pull out destructive test, the work load and the ultimate load are obtained on site, and the Flac3d numerical simulation method is employed to determine the axial force distribution and the effective anchor length. The test results show that (1) the Q-S (load-displacement) curve of the bolt displays a certain degree of deformation coupled with the creep of the surrounding rock; (2) the working load of the bolt is closely related to the sliding deformation trend of the slope, while the ultimate load depends on the design parameters of the bolt and the lithology of the slope; (3) the distribution of bolt axial force is characterized by a single peak along the bolt length and the effective anchorage length of the bolt is 3 m; (4) after 20 years, the bolt’s ultimate load has a maximum loss of 31.94%.

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Keywords

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