Research on the Causes of Soft Soil and Roadbed Defect Treatment in Carbonaceous Rock Slope
National or industry specifications do not yet have a term for slope soft soil,but it is a special rock and soil which is often encountered in highway construction.The soft soil is prone to landslide damage along the interface of soil and rock under excavation or loading.In this paper,the characteristics,causes and treatment schemes of slope soft soil in carbonaceous rock area are studied by means of data collection,drilling,geotechnical test,rock thin section and X-ray diffraction mineral analysis.The following conclusions are drawn:(1)The slope soft soil in carbonaceous rock area has the characteristics of flake,lenticular or chicken nest distribution,the thickness is bounded by the interface of soil and rock,the underlying stratum lacks the whole weathering layer,the weathering residual and collapse slope accumulation are the main causes,and the upper part has the characteristics of hard shell layer,and has the characteristics of high natural water content,large void ratio,high compressibility,low strength and weak expansion.(2)Clay minerals,oxidation reaction and dissolution are the internal causes of the formation of carbonaceous rock slope soft soil.Climate,structure,favorable terrain and water are the external causes of its formation.(3)Settlement and landslide are geological disasters that are prone to occur in the construction of soft soil highways on carbonaceous rock slopes.For embankments,replacement method,micro-pile+replacement method,anti-slide pile pre-reinforcement method,composite pile method and bridge span method can be used for optimal treatment.For cutting,gravity retaining wall,sheet pile wall,reinforced soil retaining wall,pre-reinforcement and excavation and waterproof and drainage can be used for comprehensive treatment.
treatment of roadbed defectscarbonaceous rockslope soft soilcauseslandslide
万方数据
维普
