工程科学与技术2024，Vol.56Issue(2)：186-195,10.DOI:10.15961/j.jsuese.202200813
静水压环境下岩石动态压剪耦合力学响应与本构模型
Dynamic Responses and Damage Constitutive Model of Hydrostatically Pressurized Rocks Subjected to Combined Compressive-Shear Impacting
摘要
Abstract
Rocks in the deep underground are commonly situated in a hydrostatic stress state,and it is susceptible to complex dynamic compress-ive-shear disturbances due to the existence of a multi-scale structural surface.Thus,it is of great significance to investigate the dynamic responses and the constitutive model of hydrostatically pressurized rocks subjected to combined compressive-shear impacting for rock stability assessment and disaster prevention in the deep underground.Using the modified split Hopkinson pressure bar(SHPB),the dynamic compression-shear im-pacting tests were conducted on the oblique sandstone specimens with hydrostatic confinement.The effects of hydrostatic confining pressure,the shear component in the dynamic loading and the loading rate on the rock mechanical properties have been revealed.Based on the Drucker-Prager criterion and Weibull distribution,the damage constitutive model of hydrostatically pressurized rocks under combined compressive-shear impact-ing was established.Results showed that as loading rate and hydrostatic confining pressure increased,dynamic strength and deformation modulus of rock showed an increasing trend.It indicated that both the hydrostatic confining pressure and loading rate had an enhancement effect on the rock dynamic strength.The shear component in dynamic load weakened the stiffness of rocks and improved its deformation ability.As the tilting angle and hydrostatic confining pressure increased,the impact failure pattern of rocks under coupled hydrostatic confining pressure and compress-ive-shear impacting changed from the tensile-dominated failure with a truncated conical surface to the shear-dominated failure with a single shear plane along the short diagonal of the specimen.The shear component in dynamic load had obvious limitations on the fragmentation of rock with hydrostatic confinement.Furthermore,the analytical expression of distribution parameters F0,m,and q were deduced,and the influence of such distribution parameters on the constitutive model was explored for a better understanding of their physical significance.Experimental and theoret-ical stress-strain curves were compared,and the consistency between these two category curves indicated that the established damage constitutive model could characterize the mechanical properties of hydrostatically pressurized rocks under combined compressive-shear impacting.This study could provide some theoretical support for safety construction and disaster protection of deep rock engineering under complex dynamic disturb-ance.关键词
深部岩石/静水围压/霍普金森压杆/动态压剪耦合/动力响应/损伤本构模型Key words
deep underground rocks/hydrostatic confinement/SHPB/compressive-shear impacting/dynamic responses/damage constitutive model分类
数理科学引用本文复制引用
杜洪波,王鑫婷,魏明东,阿比尔的,王浩然..静水压环境下岩石动态压剪耦合力学响应与本构模型[J].工程科学与技术,2024,56(2):186-195,10.基金项目
国家自然科学基金青年项目(52209121 （）
41907261) （）
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0952) （cstc2021jcyj-msxmX0952）
