| In recent years,rock blasting technology has been widely used in mineral resources mining and underground geotechnical engineering excavation.When deep blasting is carried out,rock mass is affected by in-situ stress and natural defects such as joints and cracks,which makes the blasting process more complex and even causes the unstable failure of the whole rock mass.Therefore,studying the blasting process of rock mass under in-situ stress conditions and joints structures have important guiding significance and application value for engineering blasting.In this paper,a simulation modal was established under the blasting loading to study using Realistic Failure Process Analysis 2D-Dynamic software(RFPA2D-Dynamic).The effects of explosion stress wave methods,in-situ stress conditions and joints conditions were deeply analyzed.The main research contents are as following:The process of rock fracturing under the different blasting loading conditions were simulated,focusing on the effects of explosion stress wave loading rate,duration,peak strength on rock fracturing.The results showed that the relationship between rock fracture morphology and failure strength is directly correlated.Furthermore,the simulation model of single hole blasting and double hole blasting in rock mass under stress settings was established respectively to study the process of initiation,propagation and coalescence under blasting loading.The effects on crack propagation with lateral pressure coeff-icient were discussed.The results showed that the characteristics of rock blasting and the propagation of fracture pattern is seriously influenced by in-situ stress.A simulation modal in jointed rock mass was built to simulate the process of rock mass fracturing and then the effects of relative position between joint and blast hole,joint length,joint count and joint angle on rock mass fracturing were mainly analyzed.The results show that the blasting effect is related to the structural shape of joint in rock mass. |
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