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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。
The proposed slope engineering strata are mainly Quaternary sediments and Silurian phyllite phase metamorphic rocks. In order to study the mechanics characteristics of the rock slope, two typical sections were selected and the large-scale on-site shear test was conducted by using the push-push method. The results show that the results of field shear test objectively reflect the basic characters and actual conditions of the test object. The shear characteristics and dilatancy shear-shrinkage characteristics of the strongly weathered phyllite are related to the degree of weathering and the integrity of the rock mass. When the degree of weathering is low and the degree of weathering is low, the mechanical properties of the rock are obvious. The shear failure is brittle failure and continuous dilatancy. When the weathering is severe and the rock mass is broken, the mechanical properties of some of the soil show plastic failure The shear strength of the gravel soil is related to the gravel content. The larger the gravel content is, the higher the shear strength is, which shows dilatancy under low normal stress. Under high normal stress The performance of the first shear after dilatation. The stability of the slope is analyzed by using the shear strength parameters obtained by different methods. It is concluded that the results of the large-scale direct shear test in the field are more conducive to slope stability analysis and reinforcement engineering design.