Research On Design Technology And Visualization Realization Of Drainage System Of Accumulation Landslide

Accumulation landslide is one of the most widely distributed and persistent geological disasters in the mountainous area of southern Shaanxi,accounting for more than 80% of the total number of landslides in the area,which poses a serious threat to the lives,property and normal production activities of local people.Analysis shows that the rainfall is induced in accumulation of the main causes of landslide formation,so the reasonable design of landslide drainage system and perfect the function of disaster prevention and mitigation of drainage system,can effectively will be on the surface of the slope rainfall collection and drainage ditch along the set quickly from the scope of landslide,the slope disaster reduction and promoting the development of mountain area economy has important practical significance.In this paper,taking shizigou accumulation landslide in Mian County,southern Shaanxi as an example,the characteristics of landslide engineering and the cause of water damage of drainage facilities in the area are investigated and analyzed,and the two-dimensional plane design of landslide drainage system and three-dimensional parametric design of drainage components are carried out according to the current code.BIM technology is applied to study the construction of three-dimensional geological model of landslide and drainage system visualization model,realize multi-software collaborative design and integrated application,so as to achieve the purpose of accurate design and construction visualization.The main research contents and achievements of this paper are as follows:(1)Through the analysis of the geological environment characteristics and the basic characteristics of the accumulation landslide in Mian county,it is shown that the failure characteristics of the accumulation landslide in Shizigou are mainly the overall revival of the old landslide and the local failure of the landslide front induced by the coupling effect of earthquake and rainfall.Its formation is the result of the comprehensive action of environmental internal and induced external factors.Topography,formation lithology,geological structure and neotectonic movement are the internal factors of the environment,while rainfall infiltration,slope toe excavation and earthquake are the external factors that affect and induce the formation of geological disasters.At the same time,from the macroscopic point of view,the formation mechanism of the accumulation landslide induced by three kinds of external factors is deeply analyzed.(2)Based on the investigation of the drainage system built in the accumulation landslide area in the mountainous area of southern Shaanxi,the damage forms and causes of various main drainage facilities are analyzed and summarized,and it is concluded that the typical damage forms of drainage facilities in this area are silting up in the channel,ditch collapse,ditch bottom leakage and ditch body fracture;The "three common problems" of drainage facilities in landslide area and the "three improvement" measures of drainage efficiency of drainage system are put forward.Starting from the design concept of drainage system in landslide area,three factors affecting drainage system design are analyzed and discussed.(3)On the basis of the current code and related research,the design parameters of design rainfall return period,safety height of ditches,design discharge and scouring and silting conditions in southern Shaanxi landslide area are analyzed,supplemented and listed.According to the plane form and topographic characteristics of the shizigou landslide in Mian County,the drainage control measures of "surface interception drainage and sealing seepage prevention" are adopted comprehensively.Combined with relevant design principles,design content,engineering characteristics and design theory calculation,the two-dimensional plane design of drainage system is carried out,and the layout scheme of drainage facilities is determined,which provides design foundation support for the subsequent collaborative design and integrated application of various three-dimensional software.(4)Based on the design example of the drainage system of The Accumulation landslide in Mian County,and based on the basic theory of BIM technology and related software,the realization process of the application of BIM model visualization simulation is studied and explored.The three dimensional parametric design and modeling of each drainage component and two drainage combinations were carried out,and the parametric component family library of the drainage system of Shizigou landslide was established.The Civil 3D platform was used to establish the three-dimensional geological model of accumulation layer landslide,and the BIM visualization model of drainage system was built and assembled based on BIM technology and Revit software.With the help of Lumion platform,the BIM visualization model is rendered and applied to realize the three-dimensional spatial visualization expression of the landslide drainage system.