Rock dynamics research related to cavern development for Ammunition storage

Zhao, Jun; Zhou, Yingxin; Hefny, A. M.; Cai, Jiangdong; Chen, S.G.; Li, H.B.; Liu, J.F.; Jain, Manisha; Foo, Shc; Seah, C. C.

doi:10.1016/s0886-7798(00)00013-4

Cited by 122 publications

(34 citation statements)

References 21 publications

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“…Then, it was gradually imported into the studies of brittle materials like rock, ceramic, and concrete (Kumar 1968;Ravichandran and Subhash 1994;Li and Gu 1994;Al-Mousawi et al 1997;Tedesco and Ross 1998;Zhao et al 1999;Cai et al 2007;Demirdag et al 2010;Zhang and Zhao 2013a). However, because of the brittle and heterogeneous characteristics of rock-like materials, the technique was plagued with the following problems:…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method

2013

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A split Hopkinson pressure bar (SHPB) system with a special shape striker has been suggested as the test method by the International Society for Rock Mechanics (ISRM) to determine the dynamic characteristics of rock materials. In order to further verify this testing technique and microscopically reveal the dynamic responses of specimens in SHPB tests, a numerical SHPB test system was established based on particle flow code (PFC). Numerical dynamic tests under different impact velocities were conducted. Investigation of the stresses at the ends of a specimen showed that the specimen could reach stress equilibrium after several wave reverberations, and this balance could be maintained well for a certain time period after the peak stress. In addition, analyses of the reflected waves showed that there was a clear relationship between the variation of the reflected wave and the stress equilibrium state in the specimen, and the turning point of the reflected wave corresponded well with the peak stress in the specimen. Furthermore, the reflected waves can be classified into three types according to their patterns. Under certain impact velocities, the specimen deforms at a constant strain rate during the whole loading process. Finally, the influence of the micro-strength ratio (s c =r c ) and distribution pattern on the dynamic increase factor (DIF) of the strength DIF were studied, and the lateral inertia confinement and heterogeneity were found to be two important factors causing the strain rate effect for rock materials.Keywords SHPB Á Special shape striker Á Discrete element method Á Strain rate effect Micro-strength ratio (ratio of contact-bond shear to normal strength) n Time-step N Current time-step DTðnÞ Interval time under time-step n(s) l Frictional coefficient at the specimen/bar interface

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method

2013

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“…The first set of caverns in Singapore is now under construction in the Bukit Timah Granite [4,5]. Extensive site and laboratory investigations have been carried out prior to the construction phase.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive site and laboratory investigations have been carried out prior to the construction phase. The site investigations have included geological mapping, seismic reflection and refraction surveys, resistivity survey, deep coring, geophysical borehole logging and cross-hole tomography, as well as in situ stress measurements [5,6]. The in situ stress tests have been performed in the Bukit Timah Granite using the hydraulic fracturing technique.…”

Section: Introductionmentioning

confidence: 99%

Hydrofracturing in situ stress measurements in Singapore granite

Zhao

Hefny

Zhou

2005

International Journal of Rock Mechanics and Mining Sciences

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“…For instance, in theoretical research, Wang [1] , Li [2] proposed a theoretical model to describe the characteristics of stress wave pass through the linear structural plane perpendicularly and furthermore given the corresponding transmission and reflection coefficients. Zhao [3] , Cai [4] , Li [5] conducted a further research on the multiple reflection of stress wave in the multi-parallel linear deformation structural planes, as well as the numerical simulations with UDEC [6][7][8] . For the structural plane nonlinear deformation characteristics of the large amplitude blasting vibration, Zhao, Yu and Song [9][10][11][12] explored the structural plane nonlinearity effect on the traffic ability and the corresponding theoretical mechanism of stress waves.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Propagation Characteristics of Blasting Vibration in Layered Rock Masses

Zou¹,

Gong²

2017

dtetr

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ABSTRACT Blasting vibration propagates anisotropically in the layered rock mass. Combined with a typical engineering case, propagation and attenuation characteristics of blasting vibration along different propagation paths were studied based on the blasting experiment and vibration measurement result. According to the analysis result, the engineering area was classified into vibration-sensitive region, surrounding region and general region considering their different influences on the protected buildings. To comply with the vibration velocity control requirements, the blasting parameters for different regions were specifically proposed so as to ensure the safety of the neighboring building and the construction period of the project.The analysis method of blasting vibration test can provide a useful and important reference for the similar construction cases.

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Rock dynamics research related to cavern development for Ammunition storage

Cited by 122 publications

References 21 publications

Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method

Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method

Hydrofracturing in situ stress measurements in Singapore granite

Experimental Study on the Propagation Characteristics of Blasting Vibration in Layered Rock Masses

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