摘要
采用物理力学性质试验,对大别山地区片麻岩风化带岩土体的强度特征进行研究。不同风化程度片麻岩的物理性质试验表明,随着风化程度的加深,片麻岩风化物内部孔隙体积逐渐增大,密度逐渐减小,越容易受到风化营力的影响;水理性质试验表明,随着风化程度的加深,片麻岩风化物的吸水率、饱水率及渗透系数均大幅增加;力学性质试验表明,随着风化程度的加深,片麻岩风化物各类力学参数均显著降低。在差异风化条件下将大别山地区片麻岩边坡局部变形破坏模式归纳为层内弧面滑动型、结构面直线滑动型、坡面流滑型、顺层滑移拉裂型、楔形体破坏型、倾倒破坏型六种,同时以蕲春某高切坡为实例,对防治对策进行研究,以期为今后片麻岩边坡调查、评价、治理、监测工作提供参考。
In this paper,physical and mechanical properties tests are used to study the strength characteristics of rock and soil in gneiss weathered zone.The physical properties of gneiss with different weathering degrees show that with the deepening of weathering,the pore volume of gneiss weathering gradually increases,the density gradually decreases,and the more vulnerable to the influence of weathering.Hydrological properties test show that with the deepening of weathering degree,the water absorption,saturation rate and permeability coefficient of gneiss weathering increase significantly.The mechanical properties test show that with the deepening of weathering degree,all kinds of mechanical parameters of gneiss weathering materials are significantly reduced.The local deformation and failure modes of gneiss slope in Dabie Mountain area under different weathering conditions are summarized as six failure types:in-layer arc sliding type,structural plane linear sliding type,slope flow sliding type,bedding sliding tensile type,wedge damage type and dumping damage type.At the same time,taking a high cutting slope in Qichun as an example,the prevention and control countermeasures are studied,in order to provide reference for the investigation,evaluation,treatment and monitoring of gneiss slope in the future.
作者
张攀
何明明
艾广申
陆浩
吴鹏飞
Zhang Pan;He Mingming;Ai Guangsheng;Lu Hao;Wu Pengfei(Third Geological Brigade of Hubei Geological Bureau,Huanggang,Hubei 438000)
出处
《资源环境与工程》
2021年第5期719-726,750,共9页
Resources Environment & Engineering
关键词
差异风化
大别山地区
片麻岩
边坡
变形破坏模式
防治对策
differential weathering
Dabie Mountain area
gneiss
slope
deformation and failure mode
control measures
