Rigid-discrete Coupling Stability Analysis Of Ruins In The Digging Process

Due to the squeezing action of the Pacific plate,the India plate and the Philippines Sea plate,the earthquake fault zone in our country is well developed,a lot of destructive earthquake had caused major personnel and property losses to the local people,in which the collapse and destruction of the buildings was the main cause of casualties.The masonry structure,as one of the main type of building structures in China,has been the most severely destroyed during previous earthquakes,besides,it is more difficult to rescue.In order to minimize the loss of personnel and property as well as improve the efficiency of rescue and rescue success rate,the study on the earthquake rescue process is particularly important.Using in situ experiment or scale model during earthquake rescue is a kind of classical simulation method,however,these methods require a lot of manpower,material and financial resources.What's more,it is difficult to carry out multiple experiments for different situations.Therefore,this paper adopts the discrete element software PFC^3D instead to simulate the earthquake rescue process.The following work has been mainly carried out:?1?The application status,basic ideas of discrete element software PFC^3D are introduced in detail and the parallel bonds model and the mechanism of rigid-discrete coupling are specially introduced.At the same time,through consulting a large number of masonry earthquake hazard data,the earthquake hazard characteristics of masonry structure are fully discussed in this paper.All the above make preparation for establishing the masonry structure model and simulating the rigid discrete coupling.?2?A model of two layers and three units of masonry structure is established by using discrete element software PFC^3D,and simulate many kinds of earthquake hazard of masonry structure under earthquake.And compared with the actual earthquake hazard,the rescue difficulty under the earthquake hazard is analyzed,which effectively verified the capability of PFC^3D to simulate the earthquake hazard of masonry structure.And we build a rigid bucket model according to the actual excavator bucket size,which will lay a good foundation for future earthquake rescue research.?3?The rigid bucket is acted on the discrete ruins and achieve rigid-discrete coupling,Successfully Simulated the dynamic digging process,and analyze the changing regularityof force,velocity and displacement in the rigid-discrete coupling process.Analyze the stability of ruins under the action of excavation bucket,the common problems in the excavation process are obtained.Assessing the dangerousness of excavation in different collapse sites,and get the reasonable construction sequence of rescue.In this paper,the application of three-dimensional discrete element software PFC^3D,successfully simulate the discrete ruins of earthquake and establish a rigid bucket model and preferably achieve the rigid-discrete coupling process,which can provide a reference for the safe and efficient implementation of earthquake rescue and has a strong forward looking.