White Dragon Playground Slope Stability And Reinforcement Analysis

During the rainy season in 1997,BaiLong playground slope slided, manpower-dig-hole-picket and concrete wall was constructed to fasten the slope in 1998,however repair not meet anticipation.As time goes on,the deformation of slope geted expand,especially the middle segmentmid, resulting in crack and subside at the crest of slope. In 1999 rainy season, slided further,pre-stress anchor-nail was adopted to fasten the slope in 2000 with the same result. Observation data shows BaiLong playground slope is still in a state of instability,and its side deformation continues in middle segmentEndured two repairs in five years, The slope is not still stable.So it indicates that the slope stability problem is typical of complicated soil slope.By applying the theory of inherent mechanism of rainwater inducing a premium on slope with non-saturatied soil,simulating slope stability in prophase and current with limit equilibrium of soil,changing soil's resist shear intensity index value of C(cohesion) and f to simulated non-saturatied soil-water characteristic change,to simulate stability variation from water to slope,conclusion can be made that rainfall was the real cause of slid which located on the fleet layer of non-saturatied soil in the top of slope.By measuring the slope in detail on the spot,accurate landform information and section plane drawing can be obtained,In addition, many reconnaissance on the slope helps find out current evidence of slope and achieve full informations of slope which is needed for studing the slope.Analzing the slope after repair with limiting equilibrium theory indicates that safety factor K goes down with the declining of pre-stress anchor-hold. The instability state of BaiLong playground slope was caused by anchor-hold of anti-slide pile and invalidation of pre-stress anchor-pire.Groundwater reduces resist shear intensity of soil,destructed stability of the BaiLong playground slope, resulting in slope deformation.The two repairs have reinforced the top of the slope,and the stress of the slope has been redistributed distribut. Analzing the slope with FEM(finite elements method) and FDM(finite difference method) contributes to finding the deformation trend of the slope,offening reliable data for reinforce.On the base of the abave analysis,the first reinforce scheme is anti-slide pile to reinforceslope.Design and calculate anti-slide pile on theory of elasticity pile and rigidity pile.The second reinforcing scheme: reinforce soil of slope.Pour plasm and reduce containing water to reinforce the soil of the slope.The paper summarizes methods of analysing and reinforcing slope on the base of analyzing stability and reinfotcement (a cast study) of BaiLong playground slope.