温度和剪切速率对树脂锚固界面裂隙演化机制的影响

Influence of Temperature and Shear Rate on Crack Evolution Mechanism at Resin Anchorage Interface

摘要:

为研究温度和剪切速率对树脂锚固界面裂隙演化机制的影响，利用变温剪切试验装置对锚固试件进行剪切试验，并利用数字图像相关法（DIC）和扫描电镜（SEM）分析了剪切界面裂隙的演化规律和微观破坏特征.结果表明：锚杆-锚固剂界面的峰值剪应力随着温度和剪切速率的增大而减小；在36°~72°范围内，随着锚杆肋角的增大，锚杆-锚固剂界面的峰值剪应力逐渐增大；温度和剪切速率对锚固剂-岩石试件的裂隙演化和锚固剂-岩石界面的峰值剪应力均有较大影响.

Abstract:

In order to study the influence of temperature and shear rate on the crack evolution mechanism of resin anchorage interface， the shear test of the anchorage specimen was carried out by using a variable temperature shear test device. The fracture evolution mechanism and micro-failure characteristics of the shear interface were analyzed using the digital correlation technique （ DIC ） and scanning electron microscope （ SEM ）. The results show that the peak shear stress at the interface between the anchor and anchoring agent decreases with the increase in temperature and shear rate. In the range of 36°-72°， with the increase of bolt rib angle， the peak shear stress of bolt-anchorage agent interface increases gradually. Temperature and shear rate have great effects on the fracture evolution of anchoring agent-rock specimens and the peak shear stress at the anchoring agent-rock interface.