Research On The Stability Of Diseased Retaining Wall In Reservoir Area Affected By Impact Load

After the storage of the Three Gorges reservoir,the bank retaining wall is affected by the change of water level.The strength of the soil behind the wall decreases,which affects the stability of the retaining wall.There are many diseases along the bank retaining wall.Pile structure is a common structure form of reinforcement retaining wall of disease,but studies have more centralized optimization method of reinforcing structure and sheet pile retaining wall in the disease after disease resistance to deformation of the retaining wall reinforcement effect,less consideration of pile structure influence on the original disease reservoir retaining walls produced in the reinforcement construction process.There are many examples of damage caused by impact loading during construction,and the impact of impact load on the stability of buildings becomes more and more important.In this paper,on the basis of previous studies,using finite element analysis software PLAXIS,the effects of 5 kinds of construction of retaining wall in front of punching construction conditions,the stability of retaining wall,and the multi pile construction at the same time under the effect of distance on the stability of retaining wall is analyzed.The main work and achievements of this paper are as follows:(1)The constitutive model of the impacted soil and the formula for calculating the peak value of the impact load are discussed and analyzed.The soil constitutive model and the method for calculating the impact load are determined.(2)Before the failure,the retaining wall’s ability to resist deformation increases with the increase of the number of hammer strikes.With the increase of water level,the displacement value of retaining walls first increases and then decreases.At the same time,the peak value of impact force and the change of shock frequency also affect the displacement of retaining wall.(3)The surface layer of hammer retaining wall deformation value of the greatest impact,and with the increase of hammer depth,the effect of deformation degree decrease greatly,first proposed in the construction of small shock can punch displacement of retaining wall construction,and focus on monitoring began punching.With the increase of steel casing embedment depth,impact load generated by the hammer of the retaining wall is small,the displacement will greatly decrease in steel tube embedded in the weathering layer,the proposed construction,at least to the steel tube embedded weathered layer,preferably directly embedded in the weathering layer after punching construction.(4)Multi pile synchronous construction can greatly increase the displacement of the retaining wall deformation,construction of longer distance,influence the stability of the retaining wall is small,when the construction space increased to 8D(D is the diameter of thepile),which jumped 3 piles during construction,and then increase the construction spacing decreased when the effect of weak wall displacement values,so the actual construction recommended construction space in 8D.At the same time in the construction of the need to focus on monitoring the construction of retaining wall due to the deformation of the pile.