软弱岩体锚杆物理锚固装置参数优化分析及试验研究  

Parameter optimization and experimental study of anchorage device for soft rock mass bolt

作　　者：郭鹏飞 王戌 徐飞龙 孙岩 刘鑫 GUO Peng-fei;WANG Xu;XU Fei-long;SUN Yan;LIU Xin(School of Civil Engineering,Shaoxing University,Shaoxing,Zhejiang 312000,China)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴312000

出　　处：《岩土力学》2024年第10期2961-2970,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.59104188)。

摘　　要：对于软弱岩体的锚杆支护,传统锚固剂锚固往往不能发挥理想的锚固效果。针对软弱岩体锚固性能差、锚固力易衰减的技术难题,提出一种物理锚固装置对软岩进行锚固,增强锚杆对软弱岩体的支护效果,确保锚固能力的持续稳定。采用数值模拟及室内试验相结合的方法开展系统研究。数值模拟结果表明:在设计参数范围内,锚固装置上倒齿的高度越大,锚固力越大;倒齿的角度越小,锚固力越小;倒齿的排数越多,锚固力越大,而倒齿间距对锚固力影响不显著。在数值模拟的基础上,选取锚固装置倒齿的最优参数并进行拉拔试验。试验结果表明:物理锚固装置能保证锚固力长时间不衰减,并且3排倒齿的锚固装置能提供的锚固力高于传统锚固剂锚固。本研究有助于解决软岩条件下锚杆锚固性能差的核心问题,为确保软弱岩体的锚杆支护效果提供了重要参考。Traditional anchoring agents often fail to provide effective bolt support for soft rock mass.To address the issues of poor anchoring performance and easy attenuation of anchoring force in soft rock mass,a physical anchoring device is proposed.This device aims to enhance the support effect of bolt and ensure continuous stability of anchoring ability.This study combines numerical simulations and laboratory experiments for systematic research.Numerical simulation results show that within the range of design parameters,higher inverted teeth on the anchoring device results in greater anchoring force.A smaller tooth angle decreases the anchoring force.More rows of inverted teeth increase the anchoring force,while the spacing of inverted teeth has no significant effect on the anchoring force.Based on numerical simulations,the optimal parameters for the inverted teeth of the anchoring device were selected,and drawing experiments were carried out.Experimental results show that the physical anchoring device maintains anchoring force over a long period.The three-row inverted teeth anchoring device provides higher anchoring force compared to traditional anchoring agents.This study helps to solve the core problem of poor anchoring performance in soft rock conditions,and provides a valuable reference for improving bolt support in soft rock mass.

关 键 词：软弱岩体 锚杆支护 物理锚固 参数优化 拉拔试验 

分 类 号：TU457[建筑科学—岩土工程]