Study On The Mechanism And Treatment Method Of Cutting Slope Disease On The Erlianhaote-Guangzhou Expressway Under Rainy Environment

The problem of slope disease control is a hot issue both in the past and now.China has made great strides in infrastructure construction in recent decades.With the development of highway,railway,Hydropower engineering,mining and other engineering projects,many considered caused slopes have been formed,many man-made slopes have been formed,such as road,railway and other excavation caused by cutting slope,embankment slope caused by filling,mining caused by a series of slopes.In the experience of rain erosion,weathering erosion,earthquake,human disturbance and other factors,the slope will often occur in different degrees of disease,forming potential landslide risk.It is of great significance to find the disease in time and reinforce the slope.In this paper,the slope with left cut disease at K2658+755 of ErlianhaoteGuangzhou expressway is analyzed by using unbalanced thrust method,MorgensternPrice method and FLAC3 D numerical simulation method.The current stable state of the slope and the mechanism of damages are obtained.Through the comparison and selection of several schemes,this paper puts forward a slope disease control scheme with prestressed anchor cable and lattice beam as the main reinforcement structure.This paper also analyzes the action mechanism and characteristics of the reinforcement mode of prestressed anchor cable lattice beam.Through the inverted beam method,Winkler elastic foundation beam method and FLAC3 D numerical simulation method,the internal force distribution law of lattice beam in the reinforced structure is studied,and the influence of the spacing of anchor cable in the prestressed anchor cable,the length of anchor cable and the inclination Angle on the reinforcement effect is analyzed,on this basis,the optimum control scheme of the slope is put forward.The main conclusions are as follows:(1)Based on the quantitative analysis of the slope of that current slope disease produces the main reason is: under the condition of strong rainfall,rain infiltration on slope along the slope surface and cracks can not discharge in time,the waterproof layer to form a layer of water on the surface,weak interlayers in slope body under the effect of soaking rain further,the shear strength index is greatly reduced,the slope diseases.(2)Through the comparison and selection of several reinforcement schemes,it is determined that the prestressed cable lattice beam is the most reasonable reinforcement method under the current slope state.(3)The internal force of the lattice beam obtained by Winkler elastic foundation beam method is in good agreement with that obtained by FLAC3 D numerical simulation,and the bending moment of the lattice beam obtained by inverted beam method is relatively large.The difference of bending moment between different longitudinal beams is small,the negative bending moment reaches the maximum value at the concentrated force,and the positive bending moment value appears in the middle,and the peak value of the negative bending moment of the longitudinal beam is near the concentrated force at the slope top,and the bending moment value at the concentrated force at the foot of the slope and the concentrated force in the middle is smaller.There are obvious differences in bending moment values between different beams.The bending moment of the beam located at the lower part of the slope is larger than that at the upper part of the slope.(4)Anchor cable spacing,dip Angle and anchor length all have an impact on the reinforcement effect.Under the engineering geological conditions,anchor cable spacing is 4m,anchor cable dip Angle is 25° and anchor length is 10 m,so the reinforcement effect is better.