Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway
The left-hand rolling-thread steel bolt has been proposed as a new bolt for controlling roadway surrounding rock. To explore the mechanism of a left-hand rolling-thread steel bolt in roadway surrounding rock control, its pretightening forces, tensile strengths, anchoring forces, and maximum working...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-03-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/9/3/346 |
| _version_ | 1819168271540158464 |
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| author | Jinpeng Zhang Limin Liu Jun Shao Qinghai Li |
| author_facet | Jinpeng Zhang Limin Liu Jun Shao Qinghai Li |
| author_sort | Jinpeng Zhang |
| collection | DOAJ |
| description | The left-hand rolling-thread steel bolt has been proposed as a new bolt for controlling roadway surrounding rock. To explore the mechanism of a left-hand rolling-thread steel bolt in roadway surrounding rock control, its pretightening forces, tensile strengths, anchoring forces, and maximum working resistances were compared to normal right-hand full-thread steel bolts in the engineering context of the 1301 haulage roadway in the Daxing Coal Mine. Then, the left-hand threaded steel bolt was applied to the 1301 haulage roadway that the right-hand threaded steel bolt failed to control. The results indicated that due to the different effective tensile section area, the yield strength and tensile strength of the left-hand threaded steel bolt with the same material and diameter were more than 10% larger than those of the right-hand threaded steel bolt. Due to the different thread directions, the anchoring forces of the Φ18 and Φ20 left-hand threaded steel bolts were 46.2% and 33.3% greater than those of the right-hand threaded steel bolts, respectively. In the 1301 haulage roadway, the maximum pull-out force of the left-hand rolling-thread steel bolt with the same diameter was obviously greater than that of the right-hand full thread steel bolt. The displacements of the 1301 haulage roadway supported by the left-hand threaded steel bolt were not great. So, the left-hand threaded steel bolt can effectively control the surrounding rock in the 1301 haulage roadway. |
| first_indexed | 2024-12-22T19:00:57Z |
| format | Article |
| id | doaj.art-7609c7554fef49ae8a44c2b7234b3ae8 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-22T19:00:57Z |
| publishDate | 2019-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-7609c7554fef49ae8a44c2b7234b3ae82022-12-21T18:15:56ZengMDPI AGMetals2075-47012019-03-019334610.3390/met9030346met9030346Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress RoadwayJinpeng Zhang0Limin Liu1Jun Shao2Qinghai Li3College of Mining and Safety Engineering, Shandong University of Science and Technology, 266590 Qingdao, ChinaCollege of Mining and Safety Engineering, Shandong University of Science and Technology, 266590 Qingdao, ChinaChongqing Research Institute, China Coal Research Institute, 400037 Chongqing, ChinaCollege of Mining and Safety Engineering, Shandong University of Science and Technology, 266590 Qingdao, ChinaThe left-hand rolling-thread steel bolt has been proposed as a new bolt for controlling roadway surrounding rock. To explore the mechanism of a left-hand rolling-thread steel bolt in roadway surrounding rock control, its pretightening forces, tensile strengths, anchoring forces, and maximum working resistances were compared to normal right-hand full-thread steel bolts in the engineering context of the 1301 haulage roadway in the Daxing Coal Mine. Then, the left-hand threaded steel bolt was applied to the 1301 haulage roadway that the right-hand threaded steel bolt failed to control. The results indicated that due to the different effective tensile section area, the yield strength and tensile strength of the left-hand threaded steel bolt with the same material and diameter were more than 10% larger than those of the right-hand threaded steel bolt. Due to the different thread directions, the anchoring forces of the Φ18 and Φ20 left-hand threaded steel bolts were 46.2% and 33.3% greater than those of the right-hand threaded steel bolts, respectively. In the 1301 haulage roadway, the maximum pull-out force of the left-hand rolling-thread steel bolt with the same diameter was obviously greater than that of the right-hand full thread steel bolt. The displacements of the 1301 haulage roadway supported by the left-hand threaded steel bolt were not great. So, the left-hand threaded steel bolt can effectively control the surrounding rock in the 1301 haulage roadway.http://www.mdpi.com/2075-4701/9/3/346left-hand rolling-thread steel boltright-hand full thread steel boltmechanical propertiessupporting performancesdeep and high stress roadway |
| spellingShingle | Jinpeng Zhang Limin Liu Jun Shao Qinghai Li Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway Metals left-hand rolling-thread steel bolt right-hand full thread steel bolt mechanical properties supporting performances deep and high stress roadway |
| title | Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway |
| title_full | Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway |
| title_fullStr | Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway |
| title_full_unstemmed | Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway |
| title_short | Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway |
| title_sort | mechanical properties and application of right hand rolling thread steel bolt in deep and high stress roadway |
| topic | left-hand rolling-thread steel bolt right-hand full thread steel bolt mechanical properties supporting performances deep and high stress roadway |
| url | http://www.mdpi.com/2075-4701/9/3/346 |
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