摘要
地下工程地质条件复杂多变,受力状态极其复杂,影响其稳定的因素繁多。目前,用于求解地下工程围岩应力及位移的理论及计算方法均为针对某一类具体工况提出的,故在使用时存在局限性。通过对围岩应力及位移的确定方法,即直接测量法、经验法及统计法、理论法进行阐述,总结出了各种方法的适用条件:Peck法可用于计算不排水条件下埋深大、半径小的地下工程围岩的沉降;芬纳公式适用于塑性软岩,而卡斯特纳公式则适用于硬岩;普氏理论适用于围岩破碎、松散不稳定的深埋地下工程;在浅埋地下工程施工地层变形预计中,随机介质理论的应用限于考虑平面情况;太沙基理论公式中的相关参数的选取准确度不高,计算出来的结果偏于保守;芬纳公式、普氏理论、太沙基理论、复变函数求解法可用于深埋地下工程,Peck法、随机介质理论等常用于浅埋地下工程。以此表达对地下工程围岩应力及位移确定方法发展趋势的一些看法。
Underground engineering geological conditions are complex and variable, the stress state is extremely complex, and there are many factors affecting its stability. At present, the theory and calculation method for calculating the stress and displacement of surrounding rock in underground engineering are proposed for a specific working condition, so there are limitations in use. Through expatiating on the determination methods of stress and displacement of surrounding rock, i.e. direct measurement method, empirical method, statistical method and theoretical method, the applicable conditions of various methods are summarized: Peck method can be used to calculate the settlement of surrounding rock of underground engineering with large buried depth and small radius under undrained condition;Fenner formula is suitable for plastic soft rock, while Kastner formula is applicable to hard rock;Poisson’s theory is applicable to deep buried underground engineering where surrounding rock is broken and loose and unstable;in the prediction of stratum deformation in shallow buried underground engineering construction, the application of random medium theory is limited to considering plane conditions;the accuracy of selecting relevant parameters in Terzaghi theoretical formula is not high, and the calculated results tend to be conservative;Fenner’s formula, Poisson’s theory, Terzaghi’s theory, complex function solution method can be used in deep underground engineering, Peck’s method, random medium theory and so on are often used in shallow underground engineering. This paper presents some views on the development trend of determination methods of stress and displacement of surrounding rock in underground engineering.
作者
张祥炳
ZHANG Xiangbing(China Railway 18th Bureau Group Second Engineering Co.,Ltd.,Tangshan,Hebei 063000,China)
出处
《建筑施工》
2019年第12期2210-2213,共4页
Building Construction
基金
国家自然科学基金资助项目（51608141）
国家自然科学基金资助项目（5196810）
关键词
地下工程
围岩应力
围岩位移
求解理论
underground engineering
surrounding rock stress
surrounding rock displacement
solution theory
