Research On Design Calculation And Engineering Application Of Curve-type Retaining Wall

Recently,with mountainous highways expanding rapidly,the V-shaped gully was crossed inevitably in construction of mountainous highways,so high embankments were chosen as usual structural style.The filling height of high embankments was 20m~40m generally,so the stability of high embankments was prominent.Currently,the stability and deformation of high embankment over V-shaped gully were studiedrarely at home and abroad.There were many factors that influence the stability and deformation of high embankment over V-shaped gully.Especially,the factors,the topographical features of V-shaped gullies and the forms of retaining structures,should be grasped,which was very necessary for researching the stability and deformation of high embankment over V-shaped gully.Therefore,to study the stability and deformation of high embankment over V-shaped gully was of greatly theoretical significance and good value in engineering application.This paper starting from the general linear retaining wall,taking the case of gravity retaining wall,Analyzed the characteristics of the pressure of the linear retaining wall and introduced the stability calculation of retaining wall.Combined the characteristics of the pressure of high embankment over V-shaped gully,paper analyzed the stability of high embankment over V-shaped gully and lead to the curvilinear retaining wall.Finally,Taking the high embankment over V-shaped gully in Fengjie east interchange as support project,conclude the appropriate type of retaining structure for high embankment over V-shaped gully.With the above research,the results show that:(1)Taking the usual types of retaining structures in highway engineering as a starting point,the structure of gravity arch wall for high embankment over V-Shaped gully was proposed in reference to the common types of dam structures for the first time.The z-axis displacement,x-axis displacement,maximum compressive stress and maximum tension stress of the gravity arch wall with five different radius of a single center were analyzed through numerical analysis method.Using principle of equivalent stress,the rational radius of arch walls was obtained.The radius is 20 m.To maintain the same radius of 20 m,when the top width of the arch wall adopted lm~2.4m,the deformation and internal force of the gravity arch wall itself could be reduced by increasing the weight of its own wall.It finds that when maintaining the top width of skewback 1m and top width of the center of arch wall B0?1.5m,the deformation and strain of the wall reduced greatly with the weight increase of it.If the top width of the center of arch wall with variable cross-section was 1.5m and that of the arch wall with single center was also 1.5m,the concrete requirement of the former was 82.1m3 less than that of the latter.And the tensile stress increased by only 0.01 MPa.It could reduce the project cost effectively and have some directive significance to the construction of mountainous highways.(2)First of all,even if the v-shaped gully of high fill roadbed 3 d constraints on the action from a certain Angle,but also conducive to the stability of the subgrade,however,the comprehensive function or other factors must be considered.Therefore,it is necessary to consider in the setting of slope retaining wall.According to regulations,the safety factor shall not be less than 1.3,according to the coefficient of control,through calculation and analysis,phase at the same time,he wall body section type curve of the stress and deformation of the retaining wall are smaller than the linear type.Further study found that when using material for concrete retaining wall strength design value of the maximum tensile stress in 1.27 MPa control,to form the axis of the wall body and reasonable radius of the circular arc of the 70 m.In addition,from the filling height and the relationship between the earth pressure on the one hand,on both sides of the gully and the center is different,low on both sides of the filling height,ditch heart is high,thus the corresponding on both sides of earth pressure is small,ditch the heart.So you can think of,in retaining wall maximum tensile stress under the condition of not high 1.27 MPa,gradually make the thickness of the retaining wall transition from thick to thin gradually,finally get a v-shaped gully high fill subgrade rational support form for both ends of the middle thick gradually thin type of variable cross-section curve "arch type" the structure of retaining wall.System research v-shaped gully high fill embankment stability and its rational support form,thus the curve type retaining wall design calculation and engineering application research,so as to further grasp the v-shaped gully change mechanism of high fill embankment stability and change trend of area in the development of the western mountain gully of highway side slope support form provides a technically feasible,economically reasonable solution.