In terms of rock engineering and technology in hydropower construction,the slope stability and monitoring techniques for high slopes of Three Gorges Project,the stability and support technology for high slopes of hydr...In terms of rock engineering and technology in hydropower construction,the slope stability and monitoring techniques for high slopes of Three Gorges Project,the stability and support technology for high slopes of hydropower projects in deep river valley,the stabilization techniques for underground cavern group with large span and high side walls are introduced in this paper.As for rock engineering and technology in highway and railway construction,the Qinghai-Tibet Railway — new construction techniques in permafrost,the support techniques for large squeezing deformation in Wuqiaoling Tunnel,the construction techniques for tunnels in alpine and high-altitude region,the geological prediction techniques for tunnels in karst region,the microseismic monitoring and early warning techniques for rockbursts in deep and long tunnels are presented.For rock engineering and technology inmining engineering,the innovative techniques for roadway support inmines,the simultaneous extraction technique of pillarless coal and gas in coal seams with low permeability,the safe and efficient deep openmining technology,advances in monitoring,early warning and treatment ofmine dynamic disasters are discussed.In addition,the new anchorage techniques and precision blasting technique in rock engineering are introduced.展开更多
Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example, the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock blast- ing process. The computation model was based on dynamica...Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example, the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock blast- ing process. The computation model was based on dynamical response of nonlinear elasto-plasticity material. According to analyses of the distribution and transmission of stress field, displacement field, velocity field, and acceleration in the course of blasting, and discusses of the blasting vibration influence to the rocky cut slope from many sides. the calculated results met well with that of in situ measured results. It is easy to determine vibration state of any point in the slope such as stress, displacement, velocity and accel- eration, which confirm that numerical simulation method is feasible. The meaning of this research is not only to design the blasting construction to forecast and prevent the ex- pressway rocky slope from disaster in mountains area, but also to offer a new experience of numerical method in geotechnical field.展开更多
This work studied the effect of increasing degree of metamorphism on the properties of rocks.The properties investigated are the physical,mechanical and dynamic parameters.They are important inputs in the design of ma...This work studied the effect of increasing degree of metamorphism on the properties of rocks.The properties investigated are the physical,mechanical and dynamic parameters.They are important inputs in the design of many mining and civil engineering techniques such as in tunnelling,slope stability and dynamic activities associated with seismicity and fragmentation.This work compared the degree of metamorphism examined through petrographic studies of the Transvaal Sequence in South Africa with the properties of the rocks.The study shows that as the effect metamorphism increases,the state of stress,compaction of grains,cementation and the brittleness of the rocks increases.In addition,increase in the metamorphic effect increases the value of the rock property.The degree of metamorphism of an outcrop is the key factor influencing its property value.Therefore the metamorphism effect of an outcrop may act as a guide to its engineering properties.展开更多
文摘In terms of rock engineering and technology in hydropower construction,the slope stability and monitoring techniques for high slopes of Three Gorges Project,the stability and support technology for high slopes of hydropower projects in deep river valley,the stabilization techniques for underground cavern group with large span and high side walls are introduced in this paper.As for rock engineering and technology in highway and railway construction,the Qinghai-Tibet Railway — new construction techniques in permafrost,the support techniques for large squeezing deformation in Wuqiaoling Tunnel,the construction techniques for tunnels in alpine and high-altitude region,the geological prediction techniques for tunnels in karst region,the microseismic monitoring and early warning techniques for rockbursts in deep and long tunnels are presented.For rock engineering and technology inmining engineering,the innovative techniques for roadway support inmines,the simultaneous extraction technique of pillarless coal and gas in coal seams with low permeability,the safe and efficient deep openmining technology,advances in monitoring,early warning and treatment ofmine dynamic disasters are discussed.In addition,the new anchorage techniques and precision blasting technique in rock engineering are introduced.
基金Supported by the National Nature Science Foundation of China(50074002)
文摘Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example, the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock blast- ing process. The computation model was based on dynamical response of nonlinear elasto-plasticity material. According to analyses of the distribution and transmission of stress field, displacement field, velocity field, and acceleration in the course of blasting, and discusses of the blasting vibration influence to the rocky cut slope from many sides. the calculated results met well with that of in situ measured results. It is easy to determine vibration state of any point in the slope such as stress, displacement, velocity and accel- eration, which confirm that numerical simulation method is feasible. The meaning of this research is not only to design the blasting construction to forecast and prevent the ex- pressway rocky slope from disaster in mountains area, but also to offer a new experience of numerical method in geotechnical field.
基金The School of Mining Engineering,University of the Witwatersrand South Africa is acknowledged for providing support towards the success of this researchSpecifically the Centennial Trust Fund for Rock Engineering is appreciated for funding part of this research
文摘This work studied the effect of increasing degree of metamorphism on the properties of rocks.The properties investigated are the physical,mechanical and dynamic parameters.They are important inputs in the design of many mining and civil engineering techniques such as in tunnelling,slope stability and dynamic activities associated with seismicity and fragmentation.This work compared the degree of metamorphism examined through petrographic studies of the Transvaal Sequence in South Africa with the properties of the rocks.The study shows that as the effect metamorphism increases,the state of stress,compaction of grains,cementation and the brittleness of the rocks increases.In addition,increase in the metamorphic effect increases the value of the rock property.The degree of metamorphism of an outcrop is the key factor influencing its property value.Therefore the metamorphism effect of an outcrop may act as a guide to its engineering properties.
