摘要
基于黏弹塑性理论和侏罗系冻结岩石表征为不稳定蠕变的试验结果,将冻结壁视为理想的黏弹塑性体,引进Kachnov损伤理论,建立侏罗系冻结岩石广义Kelvin弹塑性损伤模型。依据模型,在分析冻结壁与井壁及外围岩体共同作用的基础上,推导出侏罗系地层冻结壁塑性区半径和冻结压力p1隐式表达,揭示作用于井壁上的冻结压力分布规律。将冻结岩石蠕变试验曲线拟合参数代入理论公式计算出冻结压力,并与现场实测结果进行对比,验证所提出的理论公式合理性,其对今后侏罗系地层冻结壁和井壁结构设计具有理论指导意义。
Based on viscoelastic plastic theory and experimental results of unstable creep of frozen rock in Jurassic system,in this paper,with frozen wall taken as ideal viscoelastic plastic body,generalized Kelvin elastoplastic damage model of frozen rock in Jurassic system was established following Kachnov damage theory.In view of the established model,based on analysis of interaction among frozen wall,shaft wall,and surrounding rock mass,implicit expression of plastic zone radius and freezing pressure p1 of frozen wall in Jurassic strata was derived,and distribution regularity of freezing pressure on shaft wall was revealed.By putting fitting parameters of frozen rock creep test curve into theoretical formula,calculated freezing pressure was compared with field measured results,which verified the rationality of proposed theoretical formula.The results have theoretical guiding significance for the future design of frozen wall and shaft lining structure in Jurassic strata.
作者
曹广勇
程桦
荣传新
CAO Guangyong;CHENG Hua;RONG Chuanxin(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Civil Engineering,Anhui Jianzhu University,Hefei,Anhui 230601,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2021年第5期972-978,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51474004)。
