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基于Lade-Duncan准则的巷道围岩抗力系数 被引量:9

Rrock resistant coefficient in tunnel based on Lade-Duncan failure criterion
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摘要 基于Lade-Duncan屈服准则,合理考虑中主应力、剪胀特性以及塑性区真实弹性应变的综合影响,推导出巷道围岩抗力系数表达式。结果表明:与Mohr-Coulomb强度准则下的围岩抗力系数计算值对比,考虑中主应力影响的Lade-Duncan准则能充分发挥围岩的强度潜能,提高围岩抗力系数;剪胀特性对围岩抗力系数影响不可忽视,不考虑围岩剪胀特性,将高估巷道围岩抗力系数,设计偏危险;另外,假定塑性区的弹性应变为常数将高估围岩抗力系数,在围岩剪胀性较强时误差更明显,实际工程中应考虑围岩塑性区真实弹性应变。 Based on Lade-Duncan failure criterion and considering the comprehensive effect of intermediate principal stress, dilatancy property and the real elastic strains in the plastic zone, a formula of rock resistant coefficient was de- rived. The results show that compared with Mohr-Coulomb failure criterion, Lade-Duncan criterion can increase the rock resistant coefficient and develop the strength potentials of surrounding rock by considering the effect of intermedi- ate principal stress. The effect of dilatancy property on rock resistance coefficient can not be ignored, and if the dilat- ancy property is not considered, it would overestimate the resistant coefficient of surrounding rock, in that way, the de- sign will be very dangerous. The assumption that elastic strain in plastic zone is constant will also overestimate resist- ance coefficient of surrounding rock, the error will become more apparent with increasing the dilatancy property. In the practical engineering, the real elastic strains in the plastic zone of surrounding rock should be considered.
出处 《煤炭学报》 EI CAS CSCD 北大核心 2013年第6期982-986,共5页 Journal of China Coal Society
基金 国家自然科学基金青年基金资助项目(51208301) 上海高校青年教师培养资助计划项目(slg12019) 上海理工大学博士科研启动经费资助项目
关键词 Lade-Duncan准则 抗力系数 中主应力 剪胀 弹性应变 Lade-Duncan failure criterion resistant coefficient intermediate principal stress dilatancy elastic strain
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