冻融循环作用下的花岗岩边坡岩体强度研究  

Study on the Strength of Granite Slope Rock Mass under Freeze-thaw Cycles

作　　者：刘宏 张诏飞 李兆龙 刁虎 LIU Hong;ZHANG Zhaofei;LI Zhaolong;DIAO Hu(Yichun Luming Mining Co.,Ltd.,Yichun 152500,China;China Railway Resources Group Survey and Design Co.,Ltd.,Langfang 065000,China;Hebei Province Technology Innovation Center of Non-coal Geotechnical Engineering,Langfang 065000,China;Sinosteel Maanshan General Institute of Mining Research Co.,Ld.,Maanshan 243000,China)

机构地区：[1]伊春鹿鸣矿业有限公司,黑龙江伊春152500 [2]中铁资源集团勘察设计有限公司,河北廊坊065000 [3]河北省非煤矿山岩土工程技术创新中心,河北廊坊065000 [4]中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山243000

出　　处：《金属矿山》2024年第2期255-261,共7页Metal Mine

基　　金：“十四五”国家重点研发计划项目(编号:2022YFC2904500)。

摘　　要：以伊春鹿鸣钼矿发育的花岗岩边坡岩体为例,开展不同风化程度的花岗岩岩石样品的冻融循环单轴抗压强度试验和纵波波速试验,得到不同风化程度的花岗岩冻融循环单轴抗压强度和纵波波速损失程度不同,风化程度高的花岗岩冻融系数较低;冻融循环作用下的花岗岩单轴抗压强度冻融系数与纵波波速损伤变量之间为线性关系,对于不同风化类型的花岗岩,其线性关系高度相近。从边坡稳定性分析的角度出发,提出了2种获取冻融循环花岗岩边坡岩体强度参数的方法,并进行了计算验证。结果显示:采用单轴抗压强度冻融系数直接折减抗剪强度,或采用纵波波速冻融系数折减RMR值后推导抗剪强度,所得结果均可进行边坡稳定性计算;相对来讲,后者计算的安全系数与边坡体实际稳定状态更为接近。Taking the granite slope rock mass in Yichun Luming Molybdenum Mine as an example,freeze-thaw cyclic u-niaxial compressive strength tests and longitudinal wave velocity tests were conducted on granite rock samples with different de-grees of weathering.It was found that the freeze-thaw cyclic uniaxial compressive strength and longitudinal wave velocity losses of granite with different degrees of weathering were different,and the freeze-thaw coefficient of granite with high degrees of weathering was lower;There is a linear relationship between the freeze-thaw coefficient of uniaxial compressive strength of gran-ite under freeze-thaw cycle and the damage variable of p-wave wave velocity,and the linear relationship is similar for different weathering types of granite.From the perspective of slope stability analysis,two methods for obtaining the strength parameters of granite slope rock mass under freeze-thaw cycles were proposed and verified through calculation.The results showed that:using uniaxial compressive strength freeze-thaw coefficient to directly reduce shear strength,or using longitudinal wave rapid freeze-thaw coefficient to reduce RMR value to derive shear strength,the obtained results can be used for slope stability calculation;Relatively speaking,the Factor of safety calculated by the latter is closer to the actual stability state of the slope.

关 键 词：花岗岩 冻融循环 单轴抗压强度 纵波波速 

分 类 号：TD854.6[矿业工程—金属矿开采]