套孔应力解除法在老营盘隧道洞身段的应用  

Application of Stress Relief by Overcoring at The Laoyingpan unnel section

作　　者：满军 周子明 王耀华 豆留盼 MAN Jun;ZHOU Ziming;WANG Yaohua;DOU Liupan(China Railway Erju 6TH Engineering Co.,Ltd.,Chengdu Sichuan 610000,China;China Railway Second Institute Construction and Development Co.,Ltd.,Chengdu Sichuan 610000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]中铁二局第六工程有限公司,四川成都610000 [2]中铁二院建设发展有限责任公司,四川成都610000 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《交通节能与环保》2024年第2期233-237,共5页Transport Energy Conservation & Environmental Protection

摘　　要：依托老营盘隧道工程,本文采用应力解除法对隧道洞身段Z1K17+880处进行现场地应力测试。由测孔内的原岩应变,利用岩石的本构关系来间接计算原岩应力,同时将取出的岩芯制成标准试件,进行室内试验以获取原岩的力学参数。计算结果表明,最大主应力大小为27.44MPa,倾角-16.56°,方位角192.60°,测点岩石抗压强度与隧道洞身最大主应力之比为0.24。测试结果表明隧道测点处属于极高地应力状态,隧道在施工过程中可能会出现软岩大变形。Based on the Laoyingpan tunnel project,this paper uses the stress relief method to test the in-situ stress at Z1K17+880 of the tunnel section.From the original rock strain in the measuring hole,the original rock stress is indirectly calculated by using the constitutive relationship of the rock.At the same time,the rock core is made into a standard specimen,and the indoor test is carried out to obtain the mechanical parameters of the original rock.The results show that the maximum principal stress is 27.44 MPa,the dip angle is-16.56°,the azimuth angle is 192.60°,and the ratio of the compressive strength of the measured rock to the maximum principal stress of the tunnel is 0.24.The test results show that the tunnel measuring point belongs to the extremely high ground stress state,and the tunnel may have large deformation of soft rock during construction.

关 键 词：公路隧道 软岩大变形 地应力测试 应力解除法 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]