| In the Oil and gas exploration,the development of the rock by its own mechanical and structural characteristics,reservoir stress conditions,fracturing process and other factors.For natural fractured rock mass,natural fractures have an important effect on the fracture of rock mass,and the fracture process is very complicated.In this paper,analyzed the stress state of rock mass with natural cracks,and the fracture system of rock mass is studied.Through the experiment and numerical simulation,the influence of rock fracture on natural fractures is studied.It is discussed that the basic parameters of rock fracture are affected by natural fractures and its extended characteristics,which can provide reference for rock fracture under the influence of natural fractures.The rock mass model with different natural fractures,such as different crack angle,length and distance of natural fractures,was established by numerical software.The stress intensity factor,J integral and fracture angle were established under the same external load.With the natural geometric distribution of cracks in the situation.Through the test method of three-point bending,observed the behavior of natural cracks,the initiation and development of cracks after the prefabricated fractures were cracked.Also observed the changes of cracks and the starting loads with different natural crack angle.Based on the experimental results of three-point bending test and numerical simulation,summarized the basic parameters of rock mass fracture and the characteristics of crack propagation under the influence of different factors,which can provide reference for future research. |
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