考虑黏结特性的水电地下洞室块体地震响应分析  

Seismic Responses of Underground Cavern Block in Hydraulic Engineering Considering Bond Characteristics

作　　者：李文倩[1] 佟大威[1] 王振[1] 鲁文妍[1,2] 朱晓斌[1] 钟登华[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]南京水利科学研究院,南京210029

出　　处：《天津大学学报（自然科学与工程技术版）》2016年第4期369-375,共7页Journal of Tianjin University：Science and Technology

基　　金：国家创新研究群体基金资助项目(51321065);国家自然科学基金重点资助项目(51439005);天津市自然科学基金青年基金资助项目(13JCQNJC08900)

摘　　要：在水电工程地下洞室的施工及运行过程中,地震作用下块体可能出现滑移失稳甚至破坏,将会给工程带来严重威胁,因此研究地震作用下地下洞室块体的抗滑稳定性具有十分重要的意义.实际工程中块体与周边岩体界面上存在黏结作用,而ABAQUS的接触属性中自带的抗滑模型未考虑该特点,为此建立了考虑黏结强度影响效应的地下洞室块体修正抗滑模型,完善了块体与基岩间的静态作用与动态相对滑动的影响机理.通过验证模型与工程算例,研究了块体在静态及动态荷载激励下的响应特征与稳定性,实现了抗滑模型合理性与有效性的验证.对比经典抗滑模型与修正抗滑模型的分析结果,在重力阶段最大竖向位移分别为1.04,cm和0.05,cm,在地震过程中的平均竖向位移与最大竖向位移分别为2.24,cm、3.91,cm和2.07,cm、3.38,cm.上述结果反映了块体在黏结特性的作用下具有更好的稳定性.依次改变抗滑接触属性中的关键参数,讨论了摩擦系数及黏聚力对块体响应与接触面动态特性的影响.During the construction and operational process of underground cavern in hydraulic engineering, it is of great significance to study the anti-sliding stability of underground cavern blocks excited by earthquake because the occurrence of block＇s instability and damage induced by seismic loads may bring a serious threat to the projects. In view of the bond characteristics on the contact surface between block and rock in the practical projects, an antisliding model for the underground cavern block considering the effect of bond strength was proposed to improve the contact simulation performance of original Coulomb model in ABAQUS and perfect the influencing mechanism of the static behavior and dynamic relative sliding between block and rock. Further, not only the response behavior and stability of the blocks under the static and dynamic excitations was researched, but also the rationality and validity of the anti-sliding model was verified. Under the separate simulation by classical and modified models, the maximum vertical displacements of block in gravity stage are 1.04 cm and 0.05 cm, respectively, and the average vertical dis- placements and the maximum vertical displacements of block in seismic stage are 2.24 cm, 3.91 cm and 2.07 cm, 3.38 cm, respectively. The comparison result indicates that the anti-sliding model considering the bond effect has better stability. In addition, the influences of friction coefficient and cohesion in the anti-sliding model on block re- sponses and dynamic characteristics on the contact surface were also discussed comprehensively.

关 键 词：岩石块体 地下洞室 抗滑模型 动力响应分析 ABAQUS 

分 类 号：TV312[水利工程—水工结构工程]