Testing Mechanical Properties of Rock Bolt under Different Supports Using Fiber Bragg Grating Technology

Guo, Xinxin; Wang, Bo; Ma, Zhenwang; Wang, Zhenyu

doi:10.3390/s19194098

Cited by 13 publications

(7 citation statements)

References 37 publications

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“…In slope engineering, anchors bolts are divided into two categories: the prestressed anchors and the non-prestressed anchors; the former can also be called prestressed anchor cables if the reinforcement body consists of steel strands and wires, while the latter are often called full grouted bolts (Cheng et al, 2015). The prestressed anchor implements the pre-stress in advance is a sort of active supporting technology, while the non-prestressed anchor is activated by the deformation of the surrounding rock; this is a sort of passive supporting technology (Guo et al, 2019).…”

Section: Classification Of Anchor Bolts In Slope Engineeringmentioning

confidence: 99%

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

Li²,

Chicas³

et al. 2022

Front. Environ. Sci.

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Geotechnical anchoring technology is an important tool for disaster prevention and mitigation in slope engineering. Anchor bolts which are commonly used in slope engineering can be divided into prestressed anchors and non-prestressed anchors. Due to the superiority of anchor support technology, research on various aspects of anchor bolts, such as mechanical mechanism, anchorage effect, and the development of new-type anchor bolts, has been a significant research topic for scholars. This mini-review sums up the diverse past and current literature on anchor support technology of slope engineering in China. It focuses on the characteristics, applications, research methods, and practical cases of anchor bolts and briefly describes the history of slope anchor bolt development in China in the past 3 decades. Nowadays, the demand for engineering construction processes is increasing, and engineering geological conditions are becoming more complex, which promotes the development of anchor support technology. At the international level, achieving carbon neutrality is both an international trend and a general objective. Against the background of global commitment to carbon neutrality, the potential future perspectives for the developments of anchor support technology have been prospected in light of actual engineering needs.

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Section: Classification Of Anchor Bolts In Slope Engineeringmentioning

confidence: 99%

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

Li²,

Chicas³

et al. 2022

Front. Environ. Sci.

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“…When the λ of the incident light of the fiber satisfies the Bragg diffraction condition, the expression is as follows [ 26 ]:

where λ B is the center peak wavelength of fiber Bragg grating; n eff is the refractive index of the effective fiber core; and Λ is the grid distance between adjacent gratings, which is called the period of fiber gratings.…”

Section: Principle Of Fbg Sensingmentioning

confidence: 99%

Fiber Bragg Grating Monitoring of Full-bolt Axial Force of the Bolt in the Deep Strong Mining Roadway

Wang

Zhang

Kan

et al. 2020

Sensors

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With the increase of mining depth and strength, the evolution of bolt axial force is increasingly becoming important for ensuring the reliability and safety of support. To improve the problem of the existing coal mine roadway pressure-monitoring method, whereby it is difficult to continuously monitor the axial force of the bolt over a long period of time, a full rod fiber bragg grating (FBG) force-measuring bolt and system were designed based on the principle of fiber grating sensing. It was found that a trapezoidal groove is a relatively better groove. The linearity between the center wavelength offset of the fiber grating and the axial force was more than 0.99, and the conversion formula between the axial force of the bolt rod and the wavelength change of the fiber grating were obtained. The real-time monitoring revealed that the axial force of the bolt obviously changed before and after compression. The axial force distribution curve can be divided into the stable zone, growth zone, and peak zone. The influence of the roadway abutment pressure was approximately 130 m ahead of the working face, and the peak area was within the 25–35 m range of the advance working face. The axial force of the bolt rod at the end of the anchorage linearly increased with the tail end of the bolt, the axial force of the free segment was the largest, and the overall stress was essentially the same. The application results demonstrate the feasibility and effectiveness of the FBG full-length force bolt.

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“…Globally, research is underway to address these problems. Studies have been conducted on methods for designing a shaft-style jack anchor to reduce the loss of tensile force in earth anchors [ 5 ], measuring anchor loads via load tests using a fiber Bragg grating (FBG) sensor attached to the surface of existing load cells [ 6 ], performing pull-out tests to observe the anchor behavior by installing anchors of different types (tension, compression, and composite anchors) at different depths [ 7 ], and measuring anchor prestressed force using wireless force sensors [ 8 ] and FBG sensors [ 9 , 10 ]. Domestic studies include the measurement of anchor axial force and changes in prestressed force using load cells on anchor heads [ 11 , 12 ] and the measurement of load transfer distribution of tension and compression anchors using strain gauges, embedded gauges, load cells, etc.…”

Section: Introductionmentioning

confidence: 99%

Residual tensile force estimation method for earth anchor using elasto-magnetic sensing system

2022

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The earth anchor method is used to prevent landslides, and repair and reinforce cut or steep slopes due to its benefits of ease of construction and economic feasibility. However, the loss of anchor force has become a problem, which may cause failure and collapse of slopes when the anchor force drops below the design anchor force. While numerous studies have been conducted to solve this problem, measuring the residual tensile force of existing earth anchors remains a challenge, as prior studies required sensors to be installed inside structural members at the time of construction. Therefore, to address this limitation, an experiment was performed in this study to develop an elasto-magnetic (EM) sensor for measuring tensile force based on the EM effect, which could be installed on externally exposed anchor heads. The commercial software ANSYS Maxwell was used to analyze the optimal sensor design for the experiment. Additionally, a series of tests to measure the tensile force was conducted by fabricating the sensor based on the numerical analysis results. The area of B-H curves measured by developed EM sensor was increased according to the decrease of tensile force. Also, The tensile force estimation equation was derived and verified using measured data. According to the results, the proposed method can be one of the solution for measuring residual tensile force of earth anchor.

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Testing Mechanical Properties of Rock Bolt under Different Supports Using Fiber Bragg Grating Technology

Cited by 13 publications

References 37 publications

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

Fiber Bragg Grating Monitoring of Full-bolt Axial Force of the Bolt in the Deep Strong Mining Roadway

Residual tensile force estimation method for earth anchor using elasto-magnetic sensing system

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