Evaluation And Research On The Treatment Effect Of Gravity Retaining Wall On Building Slope In Loess Area

As a type of retaining structure,gravity retaining wall is widely used in slope engineering in loess area.There is no doubt that the building slope will remain stable for a period of time after scientific and reasonable treatment,but the slope engineering service period will be affected by many external factors,and the strength of the soil will be attenuated to varying degrees,resulting in a decrease in stability..However,at present,the evaluation of the treatment effect of the retaining wall on the slope of the building in the loess area is still in the preliminary exploration stage.This study took the slope of the retaining wall building during the typical service period in the loess area as the research object.Through a combination of field investigation,on-site monitoring,model test and numerical simulation,the treatment effect of the gravity retaining wall on the building slope in the loess area was carried out.Research,grasp the stability status of building slope retaining wall in the loess area during the service period,reveal the force and deformation law of slope retaining wall under the influence of hydrological environment and service time,and establish an evaluation system for the treatment effect of building slope gravity retaining wall.The research of the thesis has achieved the following results:(1)The types and main influencing factors of the retaining walls of the building slopes in the loess area are summarized.Based on the systematic investigation of the slope of the retaining wall during the typical service period in the loess area,it is concluded that the retaining wall diseases are mainly divided into cracks,mortar shedding,bulging deformation,misalignment,fracture,internal hollowing,foundation slippage and drain hole Blocked.The analysis shows that the main influencing factors affecting the retaining wall slope during the service period are:slope height,slope,hydrological environment,slope damage,supporting structure damage,interception and drainage engineering effect,treatment time,construction difficulty,treatment The service time of the project,and the use of AHP method to compare the weight of each influencing factor,it is calculated that the hydrological environment and the service time of the treatment project have a greater impact on the slope of the retaining wall building in the loess area.(2)Established a prediction model for the slope displacement of the retaining wall building.Based on the field monitoring displacement data,the time series projection pursuit regression model is improved by accelerating the exponential transformation and geometric mean generation transformation of the original data.Predict the displacement within a period of time after the end of the monitoring,and obtain the rule of "rapid growth-severe fluctuation-slow growth-stability" in the displacement with time,and predict the initial stability time of the retaining wall of the building slope,and the calculation is The initial stabilization time of the retaining walls of the slopes A and B in the loess area was 43.90 months and 26.23 months,respectively.(3)A numerical model for the creep of the retaining wall building slope was established.Considering the time effect of the retaining wall building slope,based on the MIDAS numerical simulation software,the displacement variation of the retaining wall slope under different slope height,slope,creep time,and rainfall intensity is obtained,and it is established with the help of Matlab’s own ones function The four-order expressions of the maximum displacement of the slope and the slope height,slope,creep time,and rainfall intensity are calculated.(4)Established an evaluation system for the treatment effect of the retaining wall on the slope of the building in the loess area.The method of combining quantitative evaluation and qualitative evaluation is used to evaluate the treatment effect of the slope retaining wall during the typical service period.Quantitative assessment is based on unascertained theory,taking slope height,slope,hydrological environment,slope damage,supporting structure damage,interception and drainage engineering effects,treatment time,construction difficulty,and service time of treatment projects as evaluation factors,Select a single index measurement function to build a matrix for evaluation,and use a slope safety grade division table for qualitative evaluation,and combine the two to evaluate the effectiveness of slope retaining walls during typical service periods.