摘要
锚杆杆体-黏结剂界面是锚杆锚固作用演化的核心,是研究锚杆支护系统力学传递机制的基础,对于揭示锚固作用机理有着重要的工程实际意义。以杆体-树脂界面为研究对象,基于弹性力学中厚壁筒原理开展了室内试验,采用聚氯乙烯塑料套筒模拟了两种低刚度围岩条件下的套筒拉拔试验,以研究不同法向刚度和肋间距条件下杆体-树脂界面力学特性的演化规律。试验结果表明,两种低刚度围岩条件下的峰值剪切应力对应的最优肋间距为20 mm,耗能值对应的最优肋间距为30 mm;基于厚壁筒原理修正了法向应力测量值,以减弱套筒拉拔试验中的泊松效应,根据拉拔试验结果阐述了界面切向和法向力学特性的演化过程。研究成果为进一步揭示锚杆杆体-黏结剂界面力学演化规律提供参考。
The bolt-binder interface is the core of the anchor role evolution,and is the foundation of studying the mechanical transfer mechanism of the bolt-supporting system,which has important practical engineering significance for revealing the anchorage mechanism.Based on the principle of thick-walled cylinder in elastic mechanics,the bolt-bonding interface was studied,laboratory tests were carried out.Polyvinyl chloride sleeve was used to simulate the drawing test of sleeve under two conditions of low stiffness surrounding rock,so as to study the evolution law of mechanical properties of the interface between rod body and resin under different conditions of normal stiffness and rib spacing.The experimental results show that the optimal rib spacing is 20 mm for the peak shear stress and 30 mm for the energy dissipation value under the condition of two low stiffness surrounding rocks.Based on the principle of thick-walled cylinder,the measured normal stress was modified to reduce the Poisson effect in the sleeve drawing test.According to the drawing test results,the evolution process of interface tangential and normal mechanical properties was described.The research results can provide a basis for revealing the mechanics evolution law of the bolt-binder interface.
作者
周济芳
ZHOU Ji-fang(Yalong River Basin Hydropower Development Co., Ltd., Chengdu 610051, China)
出处
《科学技术与工程》
北大核心
2021年第25期10873-10879,共7页
Science Technology and Engineering
基金
国家自然科学基金(U1765206)
国家重点研发计划(2016YF0600702)。
关键词
树脂锚杆
杆体-树脂界面
拉拔试验
厚壁圆筒原理
锚杆肋间距
the resin anchor rod
rod body-resin interface
drawing test
thick-walled cylinder principle
bolt rib spacing
