摘要
为探讨富水地层中锚杆加固硐室中的渗流、剪胀与中间主应力对围岩变形与锚杆受力的影响规律,首先建立渗流条件下锚杆加固硐室力学分析模型;其次,对力学模型进行求解,导出硐室围岩应力、位移解析解与塑性区半径解析公式;最后,通过数值模拟对理论解答进行验证,并进行广泛的参数分析,探讨围岩变形与锚杆受力的影响规律.结果表明:数值计算结果与理论解答吻合较好;中间主应力、渗流对围岩受力与变形影响明显;随着剪胀角增大,虽对围岩应力与塑性区半径无影响,但使得塑性区围岩位移和锚杆轴力急剧增大,易导致锚杆破断失效.
In order to study the influence of seepage,dilatancy and intermediate principal stress on surrounding rock deformation and bolt stress in bolt reinforced chamber in water rich strata,a mechanical analysis model of bolt reinforced cavern under seepage conditions was first established.Secondly,considering the dilatancy and intermediate principal stress of rock mass,the elastic-plastic analysis of the mechanical model was carried out,and the analytical solutions of stress and displacement of surrounding rock and the analytical formulas of plastic zone radius were derived.Finally,the theoretical solution was verified by numerical simulation,and extensive parameters researches were performed to discuss the influence of intermediate principal stress,dilatancy and seepage on the stress,displacement,plastic zone radius of surrounding rock and stress of bolt.The results show that the intermediate principal stress and seepage have an obvious influence on the stress and deformation of the surrounding rock.In addition,with the increase of dilatancy angle,although it has no influence on the stress and radius of the plastic zone,the displacement of surrounding rock in the plastic zone and the axial force of bolt both increase sharply,which may lead to bolt failure.
作者
吴俊峰
郭剑峰
胡景波
WU Junfeng;GUO Jianfeng;HU Jingbo(Yiwu Industrial&Commercial College,Yiwu 322000,China;Power China HuaDong Engineering Co.,Ltd.,Hangzhou 311100,China;Jinhua Xinsheng Zeolite Development Co.,Ltd.,Jinhua 321000,China)
出处
《三峡大学学报（自然科学版）》
CAS
2021年第6期69-74,共6页
Journal of China Three Gorges University：Natural Sciences
基金
浙江省自然科学基金委员会公益技术应用研究计划项目(LGF19E080002)
四川省交通厅运输科技项目(2021-ZL-01)
浙江省建设厅科研项目(2020K173)
义乌工商职业技术学院科研项目(YY-GJ-201901,ZD2021JZ429-01)。
关键词
富水硐室
锚杆加固
渗流场
剪胀特性
中间主应力
弹塑性分析
water-enriched cavern
bolt reinforcement
seepage field
dilation characteristic
intermediate principal stress
elastoplastic analysis
