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| Size effect on anchorage resistance of Quasi-NPR bolt |
| HUANG Man1, 2, WANG Yuhao1, 2, TAO Zhigang3, HONG Chenjie1, 2*, WENG Hanqian3, ZHANG Guangtao1, 2, ZHANG Haijiang1, 2 |
(1. State Key Laboratory of Intelligent Deep Metal Mining and Equipment, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Zhejiang Key Laboratory of Rock Mechanics and Geohazards, School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 3. State Key Laboratory of Tunnel Engineering, China University of Mining and
Technology (Beijing), Beijing 100083, China) |
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Abstract Quasi-negative Poisson′s ratio (Quasi-NPR) bolts, a novel reinforcement component, have been increasingly utilized in slope and tunnel support engineering. To further investigate their anchoring characteristics in large-scale rock masses with muddy interlayers, direct shear tests were conducted on mud-filled joints anchored with Quasi-NPR bolts. The analysis evaluated the anchorage shear performance under varying filling degrees (0–2) and joint lengths (100–400 mm), with comparisons made to conventional positive Poisson′s ratio (PR) bolts (HRB400). The results indicate the following: (1) At the same filling degrees, the post-peak stress drop in HRB400-bolted filled joints becomes more pronounced with increasing joint length. In contrast, Quasi-NPR-bolted filled joints exhibit relatively stable performance, accompanied by a gradually diminishing decay in residual shear strength. This suggests that Quasi-NPR bolts offer anchoring advantages during the residual stage, primarily due to their ability to mitigate the size effect on residual shear strength. (2) Although Quasi-NPR bolts develop smaller plastic hinges in small-scale specimens, these hinges gradually expand with increasing joint length, ultimately exceeding those observed in HRB400 bolts. This highlights the superior deformation adaptability of Quasi-NPR bolts in large-scale jointed rock masses. (3) The anchorage resistance ratio of Quasi-NPR bolts decreases with increasing filling degree and joint length. When the filling degree exceeds 1.6 and the joint length surpasses 300 mm, the ratio tends to stabilize. These findings provide valuable guidance for determining key design parameters of Quasi-NPR bolts in the reinforcement of muddy interlayer rock masses.
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2026, Vol. 45 
