| In recent years,local wars have occurred frequently in foreign countries.The lives of people,property security and the preservation of military facilities have been seriously threatened.The role of underground roadways is also growing.It can be used as a cover for fortifications,operational headquarters,military underground factories and warehouses.Etc.Therefore,it has become an important research topic to take effective measures to improve the anti-explosion of roadway and lining support performance.In order to further study the anti-explosion performance of the roadway composite structure under the near-explosion,and the supporting effect of the lining on the roadway,the main research contents are as follows:Firstly,the SPH-FEM smooth fluid particle dynamics finite element coupling method is used to establish the explosion effect analysis model of underground roadway to form different simulation schemes.The peak stress of the distribution layer structure of different materials is compared,based on the peak stress peak and energy peak.Compared with the vertical displacement of the dome,the clipping ability of different distribution layer structures is compared,and the peak value of the stress in the near-field of the explosion is compared with the empirical formula.Secondly,according to the relevant rock mass structure surface,combined with the random joint network simulation method of rock mass,UDEC embedded FISH language is used to establish a two-dimensional random joint network simulation model of surrounding rock structural surface to simulate the complex joints of surrounding rock.Then the displacement field evolution characteristics,minimum principal stress distribution,joint shear strain energy and joint friction energy of the surrounding rock of the roadway are analyzed under the condition of certain explosive load.The influence of the lining on the dynamic response of the surrounding rock is investigated.Finally,the relationship between the blasting load strength and the shear strain energy of the joint plane is discussed,and the topological structure of the block network when the shear zone is slipped on the left side of the surrounding rock;the complex network is introduced into the surrounding rock mass of the roadway,based on Three network parameters,such as medium degree,clustering coefficient and average shortest path length,are used to numerically simulate the complex network characteristics of surrounding rock structures under blast loading,and evaluate the supporting effect of lining on surrounding rock. |
