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Reinforcement Mechanisms of Rock Bolt: A Laboratory Investigation

Mohd For Mohd Amin, and Khoo, Kai Siang, and Chai, Hui Chon, (2004) Reinforcement Mechanisms of Rock Bolt: A Laboratory Investigation. Malaysian Journal of Civil Engineering, 16 (1). pp. 1-12.

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Official URL: http://web.utm.my/ipasa/images/stories/MJCE/2004/vol_16_no_1/Reinforcement%20Mechanisms%20of%20Rock%20Bolt_a%20Laboratory%20Investigation.pdf

Affiliations

Universiti Teknologi Malaysia, Faculty of Civil Engineering, Dept. of Geotechnic & Transportation.
Universiti Teknologi Malaysia, Faculty of Civil Engineering.
Universiti Teknologi Malaysia, Faculty of Civil Engineering.

Abstract

The use of rock bolts as rock reinforcement is becoming more popular in Malaysia. However, its effectiveness depends on a number of factors particularly with regards to the technique of installing the bolt. Its reinforcement mechanism also restricts its application for certain modes of instability and types of rock. This paper highlights a laboratory investigation on the reinforcement mechanisms of rock bolts, specifically on bolt inclination, anchorage type and level of pre-tension. The investigation was conducted using a physical model of a rock bolt intersecting a joint plane. Results obtained show that a better reinforcement can be obtained if bolt is inclined at an angle to the joint plane so that it elongates upon joint displacement. Full-bonded bolt is more superior in terms of mobilising the anchorage capacity and consequently, this allows for immediate utilisation of the reinforcing element. Pre-tensioning of bolt induces clamping effect
on joint surface consequently, helps to reduce joint dilatation and increases the inherent shear strength of the joint.

Penggunaan bolt batuan sebagai kaedah pengukuhan batuan semakin popular di Malaysia. Walau bagaimana pun, keberkesanan kaedah ini dipengaruhi oleh beberapa faktor terutamanya yang berkaitan dengan teknik pemasangan bolt. Mekanisme pengukuhan kaedah ini juga menyebabkan penggunaannya terhad pada jenis batuan dan ragam kegagalan tertentu. Kertas kerja ini membincangkan satu kajian makmal ke atas mekanisme pengukuhan bolt batuan khususnya, mengenai kesan orientasi bolt, jenis ikatan dan tahap pra-tegangan. Kajian dilaksanakan menggunakan satu model fizikal bolt batuan yang bersilang dengan satah kekar.
Keputusan kajian menunjukkan tahap keupayaan pengukuhan meningkat apabila bolt dipasang secara condong terhadap satah kekar bagi membolehkan ia mengalami pemanjangan apabila berlaku anjakan pada kekar. Bolt yang diturap sepenuhnya lebih baik dari segi menggerakkan keupayaan pengukuhan dan oleh yang demikian, kesan elemen pengukuhan dapat dimanafaatkan dengan serta merta. Pra-tegangan pada bolt dapat mengaruhkan kesan pengapitan pada permukaan
kekar dan ini dapat mengurangkan dilatasi serta meningkatkan kekuatan ricih kekar.

Item Type:Journal
Keywords:Rock bolt; bolt inclination; bonded-length; tension level Rock bolt; orientasi bolt; panjang ikatan; tahap tegangan.
Subjects:T Technology, Engineering
ID Code:6513

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