| Slope stability analysis has always been a research topic of great concern to engineers and engineers.It usually involves many engineering fields such as water conservancy,civil engineering,transportation,mining and so on.Whether the slope stability can be correctly analyzed and evaluated plays a vital role in the smooth progress of the project,the safety of the constructors and the reduction of construction costs.Firstly,this paper introduces the common methods of slope stability analysis,the research status at home and abroad,and the constitutive model of numerical simulation of rock and soil mass.Then,taking the Q1 stone yard slope of Kalu River Dam in Sri Lanka as an example,based on the finite difference software FLAC3D,the stability of slope under excavation,rainfall and blasting conditions is calculated and analyzed,and the main conclusions arc as follows:(1)According to the geological conditions of Q1 quarry s.lope of Sri Lanka KALU River dam,six excavation schemes are proposed,and the corresponding numerical model is established by ANSYS.Based on the strength reduction method and FLAC3D,the stress,deformation and stability of the slope under different excavation schemes are analyzed.The calculation results of the first,third and fifth excavation schemes show that:when the excavation slope slows down gradually,the stress and deformation of the slope decrease continuously,and the safety factor increases accordingly;when the rock ridge is reserved(i.c.the second,fourth and sixth excavation schemes),compared with no rock ridge,the stress and deformation of the slope decrease,and the safety factor increases,indicating that slowing down the slope and reserving the rock ridge are conducive to maintaining the slope.Stability.Considering that the construction of Kalu River dam requires a lot of stones and a lot of excavation work,on the premise of ensuring that the slope stability of Ql quarry meets the requirements,through comprehensive comparative analysis,scheme Ⅱ and scheme Ⅲ are preliminarily selected as the proposed excavation scheme.(2)According to scheme Ⅱ and scheme Ⅲ,the stability of Q1 quarry slope rock mass in different excavation stages after blasting damage is analyzed:that is,with the occurrence and excavation of blasting,the stress and deformation of the slope increase continuously,and the safety factor decreases accordingly;the greater the damage degree of the slope retaining body,the worse its stability.That is to say,the blasting damage of rock mass has an adverse effect on the slope stability,but the minimum safety factor of scheme Ⅱ is about 1.13,and the minimum safety factor of scheme Ⅲ is 1.37.There is no obvious plastic zone under both schemes,indicating that the slope can still be in a stablc state.(3)According to scheme 2 and scheme 3,the stability of slopc under rainfall condition is further analyzed.That is to say,due to the influence of rainfall infiltration,the slope surface gradually appears high saturation area.With the continuous occurrence of rainfall,the water in the high saturation area of the slope surface infiltrates into the slope body under gravity,and the distribution range gradually increases;the initial stage of rainfall has a great influence on the deformation and safety coefficient of the slope,but the two schemes have great influence.The downhill is stable.Considering that the reserved rock ridge in scheme Ⅱ will increase the construction difficulty,and the stability is relatively low,scheme Ⅲ is finally selected as the excavation scheme of Q1 quarry slope of Kalu River dam.Under this scheme,the follow-up works are progressing smoothly,the dam is completed on schedule,and the slope of stock yard has not been obviously deformed or destabilized. |
PDF Full Text Request