不同夹角与厚度交叉裂隙类岩体蠕变力学性能及损伤破坏  

Creep mechanical properties and damage failure of cross-fractured rock masses with different angles and thicknesses

作　　者：卢小雨 李直勇 董春亮 谢雅 张博文 郝建平 LU Xiaoyu;LI Zhiyong;DONG Chunliang;XIE Ya;ZHANG Bowen;HAO Jianping(School of Mechanics and Optoelectronic Physics,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Schoolof Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学力学与光电物理学院,安徽淮南232001 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《水利水电技术(中英文)》2025年第2期216-231,共16页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(52074006,51404011)。

摘　　要：【目的】地下岩体在长期历史地质活动中,内部存在大量裂隙,势必劣化岩体的蠕变力学性能及其抵抗破坏的能力。为揭示分级循环加卸载长期作用下裂隙夹角与厚度的变化对含交叉裂隙类岩体蠕变力学性能和损伤破坏的影响规律。【方法】根据循环加卸载蠕变试验曲线计算各级循环时的能量,并通过能量耗散法和声发射技术结合试样强度分析不同裂隙试样的蠕变力学性能和损伤破坏规律。【结果】结果显示:试样在分级循环加卸载下应力-应变曲线出现明显的滞回圈,裂隙的夹角和厚度对峰值强度与长期强度均起到劣化作用,且后者的影响要略高于前者;试样在不同裂隙条件下的输入能,弹性能和耗散能变化规律相似,损伤变量D值随循环次数增加不断递增;声发射累计振铃数在加卸载过程中会出现明显的突变,且在试样产生裂纹时突变范围越大。【结论】结果表明:从滞回圈和能量损伤D值揭示了试验过程中产生的不可逆损伤是导致试样强度变化的主要因素;从声发射累计振铃计数结合声发射信号定位图可用于判断试样内部裂隙与局部破坏的产生时间和位置,裂隙厚度与夹角越大的试样,累计振铃计数信号出现爆发式增长的时间越早,试样产生破坏时的应力越小。[Objective]In the long-term historical geological activities,there are a large number of fractures in the underground rock mass,which is bound to deteriorate the creep mechanical properties of the rock mass and its ability to resist failure.In order to reveal the influence of the change of fracture angle and thickness on the creep mechanical properties and damage damage of rock mass with cross-fractures under the long-term action of graded cyclic loading and unloading.[Methods]According to the cyclic loading and unloading creep test curves,the energy of each stage of cycling was calculated,and the creep mechanical properties and damage laws of different fractured samples were analyzed by energy dissipation method and acoustic emission technology combined with the strength of the sample.[Results]The results showed that the stress-strain curve of the specimen had an obvious hysteresis circle under graded cyclic loading and unloading,and the angle and thickness of the fracture had a deteriorating effect on both the peak strength and the long-term strength,and the influence of the latter was slightly higher than that of the former.The input energy,elastic energy and dissipation energy of the specimen under different fracture conditions are similar,and the damage variable D value increases with the increase of fracture angle and thickness.The cumulative ringing number of AE will have obvious abrupt changes in the process of loading and unloading,and the abrupt range will be larger when cracks occur in the specimen.[Conclusion]The result show that the irreversible damage caused during the test is the main factor leading to the change of specimen strength from the hysteresis loop and energy damage D value.The larger the crack thickness and angle of the specimen,the earlier the signal appears and increases,and the less stress occurs when the specimen is damaged.

关 键 词：裂隙 循环加卸载 蠕变 能量 损伤变量D值 声发射 力学性能 影响因素 

分 类 号：TU45[建筑科学—岩土工程]