| The red beds are widely distributed in China,among which the red beds in the southwest are the most widely distributed and the most representative.The red beds in the southwest are mainly distributed in Sichuan,Chongqing and remote areas of Sichuan Basin.The red layer has the characteristics of high clay mineral content,poor aging,poor interlayer bonding,soft and hard interbedded layer,so its soil strength is low,easy to disintegrate after water,softening high,uniaxial compressive strength Low bad mechanical properties.In this paper,curing agent is used to cure red soil in Mianyang area,Sichuan Province.The factors influencing the compressive strength,shear strength,impermeability and water stability of the cured red soil were studied by means of indoor geotechnical and artificial simulated slope erosion test.The main factors affecting the stability of slope slope were analyzed And to explore the protective effect of curing agent solid-soil method on improving slope stability and erosion resistance.The main research results are as follows:(1)The soil has poor water stability,the internal friction angle is 25.20 °,and the cohesion is 8.82 k Pa,the compressive strength is 50 k Pa,the red soil soil slope project is prone to slope due to the low strength Destabilizing damage.Two kinds of curing agent,three kinds of reinforcement methods can effectively improve the red layer of soil shear,compressive strength and water stability.And the cohesive force C increased by 23.0%~200.9% compared with the red soil,the internal friction angle ? increased by 3.1%~82.6% and the unconfined compressive strength increased by 31.3%~504.8%.(2)The factors affecting the shear strength and compressive strength of the red soil mainly include the amount of curing agent and the curing age.The internal friction angle,cohesion and unconfined compressive strength of the cured red soil are all increased with the increase of the curing agent and the curing age.However,it is important to note that the clay fossil and cement mixture are cured When the content of cement is high,the shear strength and compressive strength of the solidified soil specimen decrease with the increase of the content of clay and petrochemical.However,when the cement content is 5% The strength of the cured soil decreased significantly,and the clay curing agent had some "repair" effect on the unconfined compressive strength of the remolded specimen,and the loss of unconfined compressive strength was reduced after the specimen was destroyed.(3)The main factors influencing the stability and anti-scouring ability of the red soil and the soil slope are slope discharge and slope.With the increase in flow and slope,runoff also continued to increase.The amount of solid particles and the amount of solid particles in the runoff increased with the increase of the flow rate,and increased with the increase of the slope gradient.The limit slope value was 45 °.Under different discharge flow and slope conditions,the change trend of runoff intensity is the same,and the increase rate is larger in the initial stage(0~ 5min).After 5min,the increasing trend becomes smaller and gradually stabilizes,and the flow rate The influence of runoff intensity is large,and the effect of slope on runoff intensity is small.(4)Compared with the soil slope,the total sediment content of the sloping slope of the cured soil decreased by 62.23%~77.86%,and the total sediment content was decreased,The results showed that the runoff with solid particles had a significant decrease in the amount of solid particles,and the variation of the amount of solid particles in runoff with the scouring time was smaller.It is shown that the curing agent has a significant effect on reducing the amount of solid particles in slope runoff and improving the erosion resistance of slope.Considering the influence of cement and clay petrochemicals on the mechanical properties and the erosion resistance of the red soil,it is suggested that the cement and clay petrochemical mixture should be reinforced in the red soil slope reinforcement project in Sichuan area.The optimum dosage of clay petrochemical is 5% and the curing age is more than 7 days,which can improve the mechanical properties and erosion resistance of slope soil and prevent slope instability caused by slope erosion. |
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