doi:10.1016/S0267-7261(00)00104-4 
Copyright © 2001 Elsevier Science Ltd. All rights reserved.
Characteristics of surface ground motions induced by blasts in jointed rock mass
Hong Hao
, 
, a, Yaokun Wua, Guowei Maa and Yingxin Zhoub
a Protective Technology Research Center, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
b Lands and Estates Organization, Ministry of Defence, Depot Road, Singapore 109679, Singapore
Accepted 25 November 2000.
Available online 20 February 2001.
References and further reading may be available for this article. To view references and further reading you must
purchase this article.
Abstract
An in-situ experimental program in a jointed rock mass was designed and implemented to investigate the rock joint effects on stress wave propagation. Accelerometers were placed on rock surface along three lines at 0, 45 and 90° to the predominant rock joint strike direction. Eight blasts were detonated in a charge hole drilled in the rock mass. The equivalent TNT blast weight ranged from 2.5 to 50.0 kg and the loading density (charge weight divided by the charge chamber volume) varied from 1 to 20.0 kg/m3. A fully coupled detonation with a charge weight of 25.0 kg was also exploded to study the coupling effect. The recorded data are presented and analyzed in this paper. The effects of rock joints on characteristics of stress wave propagation such as peak value attenuation, spectrum, and spatial variations are discussed.
Fig. 1. Configuration of the measurement site (not to scale).
Fig. 2. Ground accelerations recorded during test 6 at 50 m from charge hole in three azimuths. Charge weight 25.0 kg, loading density 10 kg/m3.
Fig. 3. Corresponding ground velocities obtained from test 6.
Fig. 4. Power spectral density functions of the recorded accelerations during test 6.
Fig. 5. Ground accelerations recorded during test 8 at 50 m from charge hole in three azimuths. Charge weight 50.0 kg, loading density 20 kg/m3.
Fig. 6. Power spectral density functions of the recorded accelerations during test 8.
Fig. 7. Ground accelerations recorded during test 4 at 25 and 50 m from charge hole in parallel and perpendicular directions to rock joint orientation. Charge weight 25.0 kg fully coupled charge.
Fig. 8. Corresponding ground velocities obtained from test 4.
Fig. 9. Power spectral density functions of the recorded accelerations during test 4.
Fig. 10. PGA and PPV of ground motion on rock surface.
Fig. 11. Coherency functions of the recorded accelerations during test 6.
Fig. 12. Cross correlation between recorded acceleration during test 6.
Fig. 13. Coherency functions of the recorded accelerations during test 4.
Fig. 14. Cross correlation between recorded accelerations during test 6.
Table 1. Best fitted functions for PGA and PPV (R is distance in meters measured from charge center, W is equivalent TNT charge weight in kilograms, COR is correlation factor of the function with the data)
Abstract
Purchase PDF (880 K)
E-mail Article
Add to my Quick Links
Cited By in Scopus (9)
Purchase PDF (341 K)
