公路岩质高陡边坡爆破开挖稳定性研究

Stability Analysis about Blasting Excavation on Highway High-steep Rock Slope

为研究秘鲁卡哈马卡省C.P.Otuzco—C.P.Combayo道路拓宽项目边坡爆破开挖安全性,模拟了爆破开挖下边坡应力、位移、质点振速状况并与实际监控数据对比。研究结果表明:浅孔预裂爆破开挖造成的最大变形值为7.88×10-2 m,上台阶位移较小;爆破压力施加之后1 ms内荷载施加工作面附近质点已达最大振动速度,上台阶为0.19 m/s,下台阶为0.18 m/s,满足《爆破安全规程》要求;爆破开挖后,典型监测点位移值在-14~10 mm间波动,最终趋于稳定值;纵向位移相较横向位移波动更大,但位移值更小,其波动幅度也逐渐趋于稳定。

In order to study the slope blasting excavation safety for the road widening project of C.P.Otuzco—C.P.Combayo in Cajamaca,Peru,the slope stress,displacement and particle vibration velocity under blasting excavation has been simulated and compared with the actual monitoring data in this paper.The research result shows that the maximum deformation value caused by shallow hole pre-splitting blasting excavation is 7.88×10-2 m with a small upper step displacement.Under the blasting pressure,the particle near the working face under the load within 1ms has reached the maximum vibration velocity.The upper step is 0.19 m/s,while the lower step is 0.18 m/s,which meets the requirements of Blasting Safety Regulations.After blasting excavation,the displacement value of typical monitoring points fluctuates between-14 and 10 mm and finally tends to be stable.Compared with the transverse displacement,the longitudinal displacement fluctuates more,but the displacement value is smaller whose fluctuation amplitude gradually tends to be stable as well.