摘要
为探明采用点荷载对机制砂用隧道洞渣饱和抗压强度进行快速评价的可行性,以点荷载强度指数为评价指标,研究加载方式、含水状态对20种不同岩性隧道洞渣点荷载强度指数的影响规律,建立隧道洞渣点荷载强度指数与饱和抗压强度的关系。结果表明:1)隧道洞渣点荷载强度指数与其饱和抗压强度具有较高的相关性,依据变质岩、沉积岩及岩浆岩等不同岩性分类得到的关系式相关性更高;2)当轴向点荷载强度指数超过8.0 MPa时,不同加载方式下的隧道洞渣点荷载强度指数存在差异,径向加载与轴向加载的点荷载强度指数相近,不规则块体加载与轴向加载的点荷载强度指数差值增大;3)隧道洞渣点荷载强度损失率与其含水率具有线性相关性,含水率越高,点荷载强度损失率越大。基于此,提出不同含水状态下的隧道洞渣饱和抗压强度预测公式。
Herein,the feasibility of using a point load for rapid evaluation of the saturated compressive strength(SCS)of tunnel muck is assessed by analyzing the effect of the loading mode and hydrous state of tunnel muck on the point load strength index(PLSI)of 20 tunnel muck samples with various lithologies.A correlation analysis is performed on the PLSI and SCS of the tunnel muck.The following results are obtained:(1)The PLSI is highly correlated with the SCS for samples with different lithologies,including metamorphic,sedimentary,and igneous rocks.(2)When the axial PLSI is>8.0 MPa,the PLSIs measured under different loading modes vary;the PLSIs measured under radial and axial loading are similar.However,the difference in the PLSIs measured under irregular and axial loading increases with the point load.The loss rate of the PLSI is positively and linearly correlated with the water content of the tunnel muck.The aforementioned results are used to propose prediction formulas for tunnel muck SCS in different hydrous states.
作者
谢京谕
李化建
王振
黄法礼
易忠来
XIE Jingyu;LI Huajian;WANG Zhen;HUANG Fali;YI Zhonglai(China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory for Track Technology of High-Speed Railway,Beijing 100081,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2023年第7期1161-1169,共9页
Tunnel Construction
基金
国铁集团科技研究开发计划课题(J2022Z505)
铁科院院基金(2020YJ049)。
关键词
隧道洞渣
点荷载
饱和抗压强度
快速评价
tunnel muck
point load
saturated compressive strength
rapid evaluation
