Monitoring Behavior of Grouted Anchors Using Vibrating-Wire Gauges

Benmokrane, Brahim; Chekired, Mohamed; Xu, Haixue

doi:10.1061/(asce)0733-9410(1995)121:6(466)

Cited by 51 publications

(23 citation statements)

References 10 publications

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“…In practice, such task is carried out by anchor tests. This is also represented in the fact that most codes are reluctant to stipulate a specific procedure to evaluate the factor of safety for the calculated external ultimate resistance and therefore, a minimum factor of safety of at least 2.5 to 3 is suggested unless full-scale field tests confirm that a lower value is satisfactory [1] [2] .…”

Section: Ground Anchorsmentioning

confidence: 99%

Monitoring of stress distribution along a ground anchor using BOTDA

Iten

Puzrin

2010

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010

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For the understanding of the bearing behavior of a loaded ground anchor, the measuring and monitoring of the stress distribution in the anchor tendon is essential. This paper proposes a novel monitoring ground anchor using embedded optical fibers for the continuous strain assessment along the anchor tendon. In a first step, optical sensors have been integrated into short tendons using different methods and laboratory strain testing was performed on these instrumented tendons. The evaluation of the laboratory testing enabled the design and development of an 8m long monitoring ground anchor for field application. In 2009, this anchor has been placed into a wall supporting an excavation pit and subsequently, anchor pullout test was carried out. The anchor was loaded stepwise up to 470kN, almost reaching its ultimate bearing capacity. Optical measurements were taken successfully at each load step. Comparison of the optical data with data acquired using conventional methods indicated good consistency of the results. To a geotechnical engineer, this proposed monitoring anchor provides a powerful tool for the measuring of the pullout load, the anchor head displacement and the load distribution in the anchor tendon.

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Section: Ground Anchorsmentioning

confidence: 99%

Monitoring of stress distribution along a ground anchor using BOTDA

Iten

Puzrin

2010

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010

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“…The three quantities of primary significance are the applied load at the rock bolts, the bolt head displacement, and the load distribution along the anchored length [1]. …”

Section: Rock Bolt Monitoring Using Smart Sensorsmentioning

confidence: 99%

A Review of Rock Bolt Monitoring Using Smart Sensors

Song

Wang

et al. 2017

Sensors

114

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Rock bolts have been widely used as rock reinforcing members in underground coal mine roadways and tunnels. Failures of rock bolts occur as a result of overloading, corrosion, seismic burst and bad grouting, leading to catastrophic economic and personnel losses. Monitoring the health condition of the rock bolts plays an important role in ensuring the safe operation of underground mines. This work presents a brief introduction on the types of rock bolts followed by a comprehensive review of rock bolt monitoring using smart sensors. Smart sensors that are used to assess rock bolt integrity are reviewed to provide a firm perception of the application of smart sensors for enhanced performance and reliability of rock bolts. The most widely used smart sensors for rock bolt monitoring are the piezoelectric sensors and the fiber optic sensors. The methodologies and principles of these smart sensors are reviewed from the point of view of rock bolt integrity monitoring. The applications of smart sensors in monitoring the critical status of rock bolts, such as the axial force, corrosion occurrence, grout quality and resin delamination, are highlighted. In addition, several prototypes or commercially available smart rock bolt devices are also introduced.

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“…A more appropriate approach is to implement sensors measuring deformations into the concrete structure, such as Vibrating-Wire Gauges (VWG). This type of sensor has already been used in civil ':'This work was supported by the ANDRA (French National Agency for Radioactive Waste Management), in particular the SAGD and URL MFS teams 1 V. Sircoulomb, N. Stoffels [7], [8]. On top of that, as these sensors are inserted into the concrete structure, they allow a permanent monitoring.…”

Section: Introductionmentioning

confidence: 99%