摘要
地下巷道(硐室)顶板常因弯曲离层而破断,其破断位置与裂隙几何形态和位置密切关联。为揭示裂隙对岩层断裂的影响,建立了岩体偏置斜裂隙的三点弯曲模型,定义了裂隙的偏置系数和贯通率,分析了裂隙偏置系数、倾角和贯通率三者之间的关系,基于力学平衡原理和σ-K关系导出了偏置斜裂隙与偏置竖裂隙应力强度因子K的关系式。同时分析了裂隙倾角、贯通率和偏置系数对应力强度因子的影响规律。该方法可为裂隙影响下巷道(硐室)顶板的张拉断裂提供判定依据。
The roof of underground roadway(chambers)often breaks due to bending and delamination,and the location of the break is closely related to the geometric shape and position of the cracks.To reveal the impact of cracks on rock fracture,a three-point bending model of rock mass with offset oblique cracks was established.The offset coefficient and connectivity ratio of cracks were defined,and the relationship between the offset coefficient,inclination angle,and connectivity of cracks was ana-lyzed.Based on the principle of mechanical equilibrium and theσ-K relationship derives the stress intensity factor K correlation between offset oblique cracks and offset vertical cracks.At the same time,the influence of crack inclination angle,connectivity,and offset coefficient on the stress intensity factor was analyzed.This method can provide a judgment basis for the tensile frac-ture of the roof of the roadway(chamber)under the influence of cracks.
作者
王超
伍永平
赵自豪
曹健
段会强
杨盼盼
WANG Chao;WU Yongping;ZHAO Zihao;CAO Jian;DUAN Huiqiang;YANG Panpan(School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Key Laboratory of Mining Engineering,Baotou 014010,China;Inner Mongolia Research Center for Coal Safety Mining and Utilization Engineering and Technology,Baotou 014010,China;Inner Mongolia Cooperative Innovation Center for Coal Green Mining and Green Utilization,Baotou 014010,China;School of Energy Sources,Xi′an University of Science and Technology,Xi′an 710054,China)
出处
《金属矿山》
CAS
北大核心
2024年第2期114-122,共9页
Metal Mine
基金
国家自然科学基金项目(编号:51964037)
内蒙古自然科学基金项目(编号:2022QN05007,2021BS05002,2019MS04016)。
关键词
三点弯曲
应力强度因子
岩体
偏置斜裂隙
贯通率
three-point bending
stress intensity factor
rock mass
offset oblique crack
connectivity ratio
