Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock
A deep understanding of the anchoring effect of rock bolts on fractured rock is essential for support design in rock engineering. In this paper, cubic specimens containing a single preexisting flaw with different inclination angles were made by high-strength gypsum; uniaxial compression tests were c...
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Wiley
2019-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/9290318 |
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| author | Rongchao Xu Hui Zhou |
| author_facet | Rongchao Xu Hui Zhou |
| author_sort | Rongchao Xu |
| collection | DOAJ |
| description | A deep understanding of the anchoring effect of rock bolts on fractured rock is essential for support design in rock engineering. In this paper, cubic specimens containing a single preexisting flaw with different inclination angles were made by high-strength gypsum; uniaxial compression tests were conducted on bolted and unbolted specimens to study the anchoring effect of the fully bonded bolt and the prestressed bolt on fractured rock. The mechanical parameters and failure characteristics of bolted and unbolted specimens were compared and analyzed in detail. The results indicated that both the prestressed and fully bonded bolt had a significant influence on the mechanical behavior of fractured rock. The average value of E, σi, σp, and σr of bolted specimens all increased due to the effect of the rock bolt. The increase degree was the greatest for the specimens with flaw inclination angle of 45°. The increase in residual strength, σr, was the most significant among all the mechanical parameters. The mechanical parameters of specimens anchored with a prestressed bolt increased with an increase in pretension stress. Besides, the reinforcement effect of the two types of rock bolts was different for different mechanical parameters. The bolted specimens displayed different failure characteristics compared to the unbolted specimens. Variation of tension stress in the prestressed bolt during the loading process was divided into three different stages. With an increase in the inclination angle from 30° to 60°, the peak tension stress value first increased and then decreased and obtained the maximum value at inclination angle of 45°. Besides, the peak tension stress value increased with pretension stress. |
| format | Article |
| id | doaj-art-a85953fedfc54ca99140cdc7b6cb6f22 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
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| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-a85953fedfc54ca99140cdc7b6cb6f222025-02-03T01:00:01ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422019-01-01201910.1155/2019/92903189290318Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured RockRongchao Xu0Hui Zhou1College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, ChinaA deep understanding of the anchoring effect of rock bolts on fractured rock is essential for support design in rock engineering. In this paper, cubic specimens containing a single preexisting flaw with different inclination angles were made by high-strength gypsum; uniaxial compression tests were conducted on bolted and unbolted specimens to study the anchoring effect of the fully bonded bolt and the prestressed bolt on fractured rock. The mechanical parameters and failure characteristics of bolted and unbolted specimens were compared and analyzed in detail. The results indicated that both the prestressed and fully bonded bolt had a significant influence on the mechanical behavior of fractured rock. The average value of E, σi, σp, and σr of bolted specimens all increased due to the effect of the rock bolt. The increase degree was the greatest for the specimens with flaw inclination angle of 45°. The increase in residual strength, σr, was the most significant among all the mechanical parameters. The mechanical parameters of specimens anchored with a prestressed bolt increased with an increase in pretension stress. Besides, the reinforcement effect of the two types of rock bolts was different for different mechanical parameters. The bolted specimens displayed different failure characteristics compared to the unbolted specimens. Variation of tension stress in the prestressed bolt during the loading process was divided into three different stages. With an increase in the inclination angle from 30° to 60°, the peak tension stress value first increased and then decreased and obtained the maximum value at inclination angle of 45°. Besides, the peak tension stress value increased with pretension stress.http://dx.doi.org/10.1155/2019/9290318 |
| spellingShingle | Rongchao Xu Hui Zhou Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock Advances in Materials Science and Engineering |
| title | Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock |
| title_full | Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock |
| title_fullStr | Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock |
| title_full_unstemmed | Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock |
| title_short | Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock |
| title_sort | experimental investigation of the anchoring effect of two different types of rock bolts on fractured rock |
| url | http://dx.doi.org/10.1155/2019/9290318 |
| work_keys_str_mv | AT rongchaoxu experimentalinvestigationoftheanchoringeffectoftwodifferenttypesofrockboltsonfracturedrock AT huizhou experimentalinvestigationoftheanchoringeffectoftwodifferenttypesofrockboltsonfracturedrock |