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Outline
To investigate the influence of Nano-SiO2 (NS) on the performance of ultrafine cement and evaluate its application efficacy in grouted bolts, test groups with varying NS dosages were established. A series of tests, including fluidity, initial setting time, mechanical properties of the grouted body, SEM microstructure, and pullout performance, were systematically conducted. Furthermore, optical frequency domain reflectometry (OFDR) was employed to monitor the strain distribution during the pullout process. The results indicate that the incorporation of NS decreases the fluidity and initial setting time of the nano-composite grouting materials while accelerating the early hydration reaction rate. At an optimal NS dosage of 2%, the compressive and flexural strengths of the grouted body are maximized, and the microstructure becomes significantly denser. The pullout tests and OFDR fiber monitoring reveal that the ultimate bearing capacity of the nano-composite grouted bolt is elevated to 210 kN. Additionally, the load-displacement curve exhibits enhanced ductility and higher residual strength; concurrently, the strain distribution along the bolt rod is more uniform, with a reduction in abrupt local strain variations. These findings verify the feasibility and effectiveness of nano-composite grouting materials in improving anchoring performance, providing robust technical support for the optimization of anchoring systems in geotechnical engineering.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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