爆破载荷下锚固岩体的累积损伤及承载性能衰减规律

The research of cumulative damage weakened and bearing capacity attenuation caused by blasting load were carried out in this project. Based on the fiber grating sensor dynamic response test of blasting load to bolted rock mass, under conditions of different anchorage mode and bearing condition, the cumulative effect of blasting rounds was systematically studied, and the cumulative damage mechanism and principles of bolted rock mass medium and anchorage interface caused by frequent blasting rounds were revealed. according to the mechanical model and evolution equation of accumulated damage,the blasting weakening effect were quantitatively described.Through analysis of the relationship between cumulative damage and bearing capacity of bolted rock mass, the instability criterion of bolt support structure under blasting rounds conditions was determined.As a result, this will provide important theory basis for blasting damage safety assessment of anchored rock and scientific determination of bolt supporting parameters, and providing important guiding significance in both theory and practice.

本课题围绕爆破载荷对锚固岩体的累积损伤弱化与承载性能衰减，采用光纤光栅全尺度传感锚固结构对爆破载荷的动态响应试验，系统研究不同锚固方式、不同承载条件下爆破载荷对锚固岩体的累积损伤弱化效应，揭示加锚条件下频繁爆破造成的被锚介质、锚固界面的累积损伤机理与发展规律，建立锚固岩体的爆破累积损伤力学模型和演化方程，定量描述多次爆破荷载对锚固岩体累积损伤效应。分析爆破累积损伤与锚固体承载能力下降之间的内在联系，得出以累积损伤为指标的锚固岩体承载性能衰减规律，确定爆破载荷下锚杆支护结构失稳判据，这将为锚固岩体爆破损伤安全评价与合理确定锚杆支护参数提供重要的理论依据和普遍的实践指导意义。

爆破作为巷道掘进常用的破岩手段，在开挖目标岩体的同时必然对巷道锚杆支护结构造成损伤和破坏，本课题围绕爆破载荷对锚固岩体的累积损伤弱化与承载性能衰减，采用光纤光栅全尺度传感锚固结构对爆破载荷的动态响应试验，系统研究不同锚固方式、不同承载条件下爆破载荷对锚固岩体的累积损伤弱化效应，揭示巷道不同部位爆破损伤，建立锚固岩体的爆破累积损伤力学模型和演化方程，定量描述多次爆破荷载对锚固岩体累积损伤效应。分析了循环荷载参数对锚固体承载性能的影响。确定了爆破累积损伤与锚固体承载能力下降之间的内在联系，得出以累积损伤为指标的锚固岩体承载性能衰减规律，确定爆破载荷下锚杆支护结构失稳判据，研究了锚固岩体主要失效模式与锚固系统的长期稳定性，这将为锚固岩体爆破损伤安全评价与合理确定锚杆支护参数提供重要的理论依据和普遍的实践指导意义。