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Wang H.,Air Force Engineering Design and Research Bureau | Yao H.,Air Force Engineering Design and Research Bureau | Yan Z.,Lanzhou University | Zhang J.,Air Force Engineering Design and Research Bureau | Yang J.,Air Force Engineering Design and Research Bureau
Journal of Earthquake Engineering and Engineering Vibration | Year: 2013

For the problem of pile foundation design of ground protective projects subjected to blast loading, a series of resrearches of dynamic property of soil and bearing capacity of pile under shock waves are carried out by the methods of dynamic triaxial test and dynamic FEM and so on. The result shows that the dynamic bearing capacity of pile is two times greater than that of static bearing capacity and 1.25 ∼ 1.5 times greater than that of current pile code method. Therefore it is conservative to estimate the dynamic bearing capacity of pile with current pile code method. Source


Yan Z.,Lanzhou University | Jiang P.,Lanzhou University | Wang H.,Air Force Engineering Design and Research Bureau
Advanced Materials Research | Year: 2012

The research deals with the issues and handling regarding the safety of complexlystructured round water pressure blast of cisterns, including calculating the safety-needed explosive quantity, explosive distribution mode, pre-treatment before the blast, safe construction and safe checking. The research specially focuses upon some safety issues and a general introduction to the safety measures to take in the project. Similar projects can also refer to it. © (2012) Trans Tech Publications, Switzerland. Source


Yan Z.-X.,Lanzhou University | Duan J.,Lanzhou University | Wang H.-Y.,Air Force Engineering Design and Research Bureau
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

According to the rule that rock mass structure plane and its shear strength properties were dominant in controlling the stability of rock slope, on the basis of rock mass structure plane network and its engineering boundary conditions, every possible slide path of rock slope was searched. By applying the theory of Lajtai and Einstein, Equivalent Mohr-Coulomb Yield Criterion, anti-slide force and sliding force of rock bridge and structure plane were calculated. Furthermore, got a rigorous formula for calculating safety coefficients; and moreover, skid-resisting reserve on each section of different slide paths and total skid-resisting reserve were ascertained. The comparative research of different slide path safety coefficients, total skid-resisting reserve and the density of total skid-resisting reserve was established. The research method for exploring dangerous slide path and stability of rock slope without obvious slip surface was studied. The example shows that applying safety coefficients and density of total skid-resisting reserve in assessing rock slope stability is feasible. Source


Yan Z.-X.,Lanzhou University | Yan L.,Xian Jiaotong University | Jiang P.,Lanzhou University | Wang H.-Y.,Air Force Engineering Design and Research Bureau
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

Blasting does work using explosion energy. It is a cheap and economical means of rock and soil excavation and widely used in ground and underground excavating engineering projects. Blast-induced ground vibration has harmful impacts on nearby structures and fields. The peak particle vibration velocity produced by ground vibration is commonly used to evaluate the risk of blast earthquake. There have been some empirical equations and methods to predict the peak ground vibration velocity, however, these equations are invalid when the specific conditions used for deduction can't be met. When blast earthquake wave propagates in rock and soil masses, ground vibration is complex and is influenced by many parameters. A discussion about the empirical equations and Fourmap method predicting the peak ground vibration velocity due to blasting was performed. Farther more, an attempt was made to predict the peak ground vibration velocity in blast earthquake by using an artificial neural network. Source


Yan Z.-X.,Lanzhou University | Peng N.-B.,Lanzhou University | Jiang P.,Lanzhou University | Wang H.-Y.,Air Force Engineering Design and Research Bureau
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

The vibration security issues and the methods of determining safety distance in blasting engineering projects were studied. Through applying structural dynamics and structural seismic principle, taking the peak velocity and the frequency of blasting-induced seismic wave into account, following the principle of discriminatively treating structural form and dynamic reaction characteristics, aiming at presently applied blasting safety regulation GB 6722-2003, the safety permission criteria and the safety distance of structural blasting vibration were investigated, the deficiency of regulation GB 6722-2003 was pointed out. Furthermore, the management and prediction of blasting-induced vibration strength were explored. Source

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