对卸荷拱理论的讨论及改进  

Discussion and improvement of unloading arch theory

作　　者：王安宝 张子寒 李引 王武 邓国强 WANG Anbao;ZHANG Zihan;LI Yin;WANG Wu;DENG Guoqiang(State Key Laboratory of Target Vulnerability Asscssment,Defense Engineering Institute,AMS,PLA;Defense Engineering Institute,AMS,PLA)

机构地区：[1]军事科学院国防工程研究院目标易损性评估全国重点实验室 [2]军事科学院国防工程研究院

出　　处：《防护工程》2024年第4期28-33,共6页Protective Engineering

摘　　要：卸荷拱理论是当前地下防护工程结构常用的承载能力计算方法,实际应用中发现该理论从假设到计算模型尚存在一些不尽合理之处。例如,在计算弯曲受压破坏时的承载力偏高,剪切破坏时的承载力偏低等等,需要进行完善和修正。采用变截面抛物线拱承载模型来表征岩石过梁弯曲受压产生的面力效应,用坑道侧壁临界面直剪破坏模型来表征岩石深梁剪切破坏。计算结果表明,该改进模型较好地适应了防护工程静荷段和动荷段一体化设计的现实需求。The unloading arch theory is a calculation method that is commonly used for the bearing capacity of underground protective engineering structures.In practical applications,the theory still has some unreasonable aspects from hypothesis to calculation model.For example,the bearing capacity is on the high side when calculating bending and compression failure,while it is on the low side when calculating shear failure,etc.,which needs to be improved and corrected.The variable cross-section parabolic arch bearing model is used to represent the surface force effect generated by the bending and compression of the rock lintel,and the direct shear damage model of the critical interface of the tunnel sidewall is used to represent the shear damage of the deep rock beam.The calculation results show that the improved model better meets the practical needs of the integrated design of the static load section and the dynamic load section of the protective engineering.

关 键 词：动被覆 卸荷拱理论 下限定理 直剪破坏 

分 类 号：TU31[建筑科学—结构工程]