全长粘结锚杆锚固能力分析研究

全长粘结锚杆在岩土介质中受力的复杂性、多变性,使得确定锚固能力十分困难。根据粘结锚杆锚固能力试验、作用机理和应力应变模式分析,建立了锚固作用力学模型,导出了参数计算的理论解。计算结果为:对于中硬岩,粘锚能力是抗拔力的(1 04～1 67)l倍,为(62 4～100)lkN;对于软岩,粘锚能力是抗拔力的(0 47～0 64)l倍,为(28 2～38 4)lkN;研究表明,钻孔、锚杆、药卷直径的合理匹配,可提高粘锚能力和切向锚固能力。

STUDY ON ANCHORING ABILITY OF FULL-GROUTED BOLTS

Because of complex and variable stress of full grouted bolts in rock and soil media, it is very difficult to determine the anchoring ability of them. Based on the experiment for anchoring ability, the action mechanism and the analysis on stress strain mode, a mechanical model for anchoring mechanism is established and used for the theoretical solution of bolt parameters. The calculation result is that anchoring force is (624～100)l kN for medium hard and hard rocks, (1.04～1.67)l times pullout force, and (282～384)l kN for soft rock, (0.47～0.64)l times pullout force. The study shows that reasonable matching of borehole, bolt rod and cement cartridge diameters can increase the bonding and shearing anchoring force.