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作 者:朱彦鹏[1,2] 张强[1,2] 马天忠[1,2] 来春景[1,2] 李京榜
机构地区:[1]兰州理工大学土木工程学院,兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,兰州730050
出 处:《防灾减灾工程学报》2015年第3期404-410,共7页Journal of Disaster Prevention and Mitigation Engineering
基 金:国家科技支撑计划项目(2011BAK12B07)资助
摘 要:拟建边坡工程地层主要为表层第四系坡积物、志留系千枚岩相变质岩。为了研究该边坡岩层的力学特性,选取2个典型地段采用平推法进行现场大型剪切试验。结果表明:现场剪切试验成果客观地反映了试验对象的基本性状和实际情况;强风化千枚岩的剪切特性和剪胀剪缩特性与其风化程度和岩体的完整性有关,当岩体完整、风化程度低时,岩石力学性质明显,其剪切破坏为脆性破坏,并表现为持续剪胀;当风化严重、岩体破碎时,表现出某些土的力学性质,呈塑性破坏,且表现为先剪缩后剪胀;砾石土抗剪强度与含砾石量有关,含砾石量越大,抗剪强度越高,其在低法向应力下表现为剪胀,在高法向应力下表现为先剪缩后剪胀。通过使用不同方法获得的抗剪强度参数对边坡进行稳定性分析,得出了现场大型直剪试验的成果更有利于边坡稳定性分析和加固工程设计的结论。We prepare to rebuild slope project′s stratum,which consists of the quaternary slope sediment in surface and silurian phyllite metamorphic rock.In order to identify the mechanical properties of the proposed slope of rock,we selected two typical areas for big shear experiments.The results showed:field shearing test can objectively reflect the basic characters and actual situation of the experimental subject;shear properties and shear compression and dilation of strongly weathered phyllite is related to their degree of weathering and integrity features of rock,and when the integrity features of rock is well and the degree of weathering is low,the rock mechanical properties is significant,the shear failure is brittle failure shows sustained dilatancy;when the weathering is bad,broken rock shows some mechanical properties of the soil,the shear failure is plastic failure and the performance is first compression then dilation;the shear strength of the gravel soil is related to the amount of gravel,when it is larger,the shear strength is higher,its performance is in dilatancy under low normal stress,and under high normal stress,its performance is first compression then dilation.By using shear strength parameters obtained by different methods to analyze slope stability,the results obtained in the large direct shear test in the field are more helpful to the slope stability analysis and engineering design,and provide a scientific basis for slope stability analysis and design.
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