摘要
随着深部地下工程开发,工程扰动诱发地质灾害问题受到广泛关注。建立扰动条件下节理岩石破坏特征关系,对于工程施工和地质灾害防治具有重大意义,基于PFC^(3D)开展扰动条件不同角度裂纹试验。结果表明:扰动条件下,改变了能量转化过程,细观能量表现为胶结能和应变能缓慢减少、阻尼能和摩擦能快速上升、动能维持稳定。声发射曲线表现为随应力突变而突变;破坏块体和接触力链扰动条件下表现为破坏模式改变和破坏程度加剧,扰动加载岩石试样破坏严重。从细观能量角度揭示了扰动加载方式下未达到峰值强度试样发生破坏现象,分析了扰动加载方式下不同节理角度的细观力学特征,为工程施工设计提供理论依据。
With the continuous development of deep underground engineering,the problem of geological disasters induced by engineering disturbance has received widespread attention.Establishing the relationship of failure characteristics of jointed rocks under disturbance conditions is of great significance for engineering construction and geological disaster prevention and control.Based on PFC^(3D),different angle crack tests under disturbance conditions were carried out.The results show that under disturbance conditions,the energy conversion process is changed.The meso-scopic energy is characterized by a slow decrease in bonding energy and strain energy,a rapid increase in damping energy and friction energy,and a stable kinetic energy.The acoustic emission curve shows a sudden change with the sudden change of stress.The failure blocks and contact force chains under disturbance conditions show a change in failure mode and an increase in failure degree,and the rock samples under disturbance load-ing are severely damaged.This paper reveals the failure phenomenon of the samples under disturbance loading without reaching the peak strength from the perspective of mesoscopic energy,analyzes the mesoscopic mechanical characteristics of different joint angles under disturbance loading,and provides a theoretical basis for engineering construction design.
作者
封占锁
曾顺洪
罗敬国
李怀鹏
Feng Zhansuo;Zeng Shunhong;Luo Jingguo;Li Huaipeng(Yunnan Yuntianhua Polycrystalline New Materials Co.,Ltd.,Yunnan,657000)
出处
《当代化工研究》
2025年第10期72-74,共3页
Modern Chemical Research
关键词
扰动加载
细观能量特征
细观声发射特征
细观破坏特征
disturbance loading
meso-energy characteristics
meso-acoustic emission characteristics
meso-failure characteristics
