摘要
深部岩体沿结构面发生滑移失稳的过程与能量转换密切相关。为研究结构面剪切过程中峰前弹性应变能的演化规律,分别选取起伏角为15°、30°、45°的红砂岩规则锯齿结构面,开展了不同法向应力条件下的直接剪切和逐级加卸载剪切试验,发现了红砂岩结构面在峰前阶段不同剪应力水平下的弹性应变能和储能效率的变化规律。试验结果表明,随着法向应力增大,峰前输入能、弹性应变能及耗散应变能均不断增大;不同起伏角与法向应力条件下红砂岩结构面的弹性应变能、耗散能与剪应力的平方均具有良好的线性关系;不同起伏角与法向应力条件下红砂岩结构面的弹性应变能满足线性储能规律,可据此估算峰值剪应力处的弹性应变能。研究结果可为从能量角度揭示岩石结构面的破坏行为提供数据支撑。
The process of slip instability of deep rock masses along a structural plane is closely related to energy conversion.To investigate the evolution law of pre-peak elastic strain energy during the shear process of structural planes,regular serrated structural planes of red sandstone with undulation angles of 15°,30°,and 45°were selected.Direct shear tests and stepwise loading-unloading shear tests were carried out under different normal stress conditions.The variation laws of elastic strain energy and energy storage efficiency of red sandstone structural planes at different shear stress levels in the pre-peak stage were obtained.The test results show that as normal stress increases,the pre-peak input energy,elastic strain energy,and dissipated strain energy all continuously increase;under different undulation angle and normal stress conditions,the elastic strain energy and dissipated energy of red sandstone structural planes have a good linear relationship with the square of shear stress;under different undulation angle and normal stress conditions,the elastic strain energy of red sandstone structural planes conforms to the linear energy storage law,and the elastic strain energy at the peak shear stress moment can be estimated based on this.The research results can provide data support for revealing the failure behavior of rock structural planes from the perspective of energy.
作者
李胜
熊自明
邢灏喆
杨启亮
范鹏贤
LI Sheng;XIONG Ziming;XING Haozhe;YANG Qiliang;FAN Pengxian(College of National Defense Engineering,Army Engineering University of PLA,Nanjing 210007,China)
出处
《陆军工程大学学报》
2025年第6期34-41,共8页
Journal of Army Engineering University of PLA
基金
国家重点研发计划(2024YFF0508204)
国家自然科学基金面上项目(52278419)
江苏省自然科学基金(Bk20240201)。
关键词
红砂岩结构面
弹性应变能
线性储能规律
加卸载直剪试验
red sandstone structural planes
elastic strain energy
linear energy storage law
loadingunloading direct shear test
