›› 2009, Vol. 30 ›› Issue (S1): 15-18.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Numerical simulation and test of lamination effect caused by blasting in layered rock slope with weak intercalated layer

XIAO Zheng-xue1, GUO Xue-bin1, ZHANG Ji-chun2, PU Chuan-jin1, XIAO Ding-jun1, XIA Zhen-kun1   

  1. 1. School of Environment Resource, Southwest University of Science and Technology, Mianyang 621002, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2009-04-20 Online:2009-08-10 Published:2011-03-16

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Abstract:

Numerical simulation of single hole blasting in layered rock slope with weak intercalation is carried out; then analyses of stress effect of the rock mass overlying, lamination effect caused by blasting and its affect on the slope stability are conducted. The simulation results that lamination effect has zoning characteristics. Blasting cavity region is formed by explosive gas scouring and lapsing the weak intercalation, the regions out of blasting cavity region are tightness region and segregation region. The weak intercalation out of segregation region is not effected by lamination effect. The rock mass over cavity region is subjected to expansion pressure from explosive gas , the peak pressure of rock mass adjacent to the interlayer wall reaches to 0.75 GPa; the tightness region is subjected to upward pressure derived from squeezing of interlayer, the peak pressure reaches to 0.21 GPa; and the pressure attenuation is relatively slow. The stability of model is decreased by the detachment of rock masses from weak intercalation and tightness region, and segregation region changes the contact state. The lamination effect which decreases the stability of model is testified by shear test.

Key words: slope blasting, weak intercalation, numerical simulation, shear test

CLC Number: 

  • TU 443
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