循环爆破作用下锁固型岩质边坡的累积损伤效应及稳定性分析  

Cumulative damage effect and stability analysis of the rock slope with a locked segment under cyclic blasting

作　　者：刘康琦 刘红岩[1] 霍泽楠 薛雷[3] 张光雄 LIU Kangqi;LIU Hongyan;HUO Zenan;XUE Lei;ZHANG Guangxiong(School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Institute of Earth Sciences,University of Lausanne,Lausanne 1015,Switzerland;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Poly Explosive Hami Co.,Ltd.,Hami 839200,Xinjiang,China)

机构地区：[1]中国地质大学(北京)工程技术学院,北京100083 [2]Institute of Earth Sciences,University of Lausanne,Lausanne 1015,Switzerland [3]中国科学院地质与地球物理研究所页岩气与地质工程重点实验室,北京100029 [4]保利民爆哈密有限公司,新疆哈密839200

出　　处：《爆炸与冲击》2025年第4期150-162,共13页Explosion and Shock Waves

基　　金：北京市自然科学基金(8222031);新疆维吾尔自治区天池英才引进计划(创新领军人才)。

摘　　要：岩石中存在许多微裂纹和微孔洞,这些微裂纹和微孔洞在动荷载作用下会萌生、扩展和聚并,导致岩石失稳和破坏。在进行爆破开挖时,预留岩体会受到循环爆破产生的动荷载影响,产生累积损伤,从而导致岩体强度降低,甚至破坏。为了模拟这一物理过程,将现有的能够较好地描述岩石动态损伤的岩石动态损伤本构模型通过二次开发嵌入到FLAC中,用于分析锁固型岩质边坡在循环爆破作用下的损伤效应及稳定性。结果表明:考虑岩质边坡累积损伤效应后,随着循环爆破次数的增加,边坡稳定性逐渐降低。对于锁固型岩质边坡,锁固段的破坏首先发生在两端,然后向中间扩散,岩体在其中呈现递进破坏模式。由于考虑了岩质边坡的累积损伤,每次爆破后边坡的安全系数都会减小。当不考虑累积损伤时,边坡的安全系数基本不变。另外,锁固段在软弱夹层中的位置影响边坡的破坏模式和稳定性。因此,在进行类似工程活动时,应考虑岩体的累积损伤效应,避免工程事故的发生。There are many microcracks and micropores in the rock,which will initiate,propagate,and coalescence under dynamic loading,leading to rock instability and failure.When blasting excavation is carried out,the retained rock mass will be subjected to the dynamic loading generated by cyclic blasting,resulting in cumulative damage,which will lead to the reduction of the rock mass strength,and even failure.In order to simulate this physical process,the existing rock dynamic damage constitutive model,which could perfectly describe the rock dynamic damage induced by blasting,was embedded into FLAC through secondary development to analyze the cumulative damage of rock mass under cyclic blasting.And then it was adopted to simulate the damage effect and stability of the rock slope with the locked segment under cyclic blasting.The stability of the slope under cyclic blasting was determined by the displacement criterion method,and the safety factor of the slope after each blasting was obtained by the strength reduction method.Finally,the relationship between the failure mode and stability of the slope and the location of the locked segment was discussed by analyzing the damage,displacement field,and safety factor of the numerical models for different locations of the locked segment in the soft interlayer.The results show that the slope stability gradually decreases with increasing the number of cyclic blasting after considering the cumulative damage effect of the rock slope.For the rock slope with the locked segment,the damage of the locked segment firstly occurs at both ends,and then propagates to the middle,in which the rock mass shows a progressive failure mode.Because the cumulative damage of the rock slope is considered,the safety factor of the slope will decrease after each blasting.When the cumulative damage is not considered,the safety factor of the slope is basically unchanged.The failure mode of the rock slope with a locked segment under cyclic blasting is the combination of dynamic tensile failure and shear failure c

关 键 词：循环爆破 累积损伤 动态损伤本构模型 二次开发 锁固段 

分 类 号：O383[理学—流体力学]