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台山核电站场平一期边坡的稳定性直接关系到电站的顺利建设及核电站运营期间的安全。通过现场爆破振动监测,分析了爆破开挖时边坡的振动速度衰减规律,发现爆区上方马道内侧质点振动速度随高程增加存在放大效应,并且这种放大效应在水平径向比垂直向更为显著;另外,在爆区上方第1级马道内侧,质点垂直向振动速度一般比水平径向振动速度大,平均为其1.5倍左右,而后随着应力波向坡体传播,垂直向速度迅速衰减,而水平径向速度衰减相对较慢,到第3级马道内侧,质点水平径向速度已和垂直向持平或略大。同时,结合三维离散元数值软件(3DEC)进行数值模拟,对边坡在爆破荷载作用下质点振动速度、位移以及塑性区状态进行分析,并与现场监测结果进行比较。结果表明,数值计算值与实测值误差在15%以内;在爆破荷载作用下边坡各级马道外侧顶点产生永久位移,但均较小,且趋于稳定;塑性区仅限于爆区周围,边坡整体是稳定的。
The stability of the first-phase slope of Taishan NPP directly affects the smooth construction of the power station and the safety during the operation of the nuclear power station. Through the on-site blasting vibration monitoring, the attenuation law of the vibration velocity of the slope during blasting excavation is analyzed. It is found that the vibration velocity of the inner side of the equator above the blasting area has the amplification effect with elevation increase, and the amplification effect is more In addition, within the first stage above the blasting area, the vibration velocity of the particle in the vertical direction is generally larger than the horizontal radial vibration velocity by an average of about 1.5 times, and then propagates to the slope with the stress wave, and the vertical velocity rapidly decays , While the horizontal radial velocity attenuation is relatively slow. To the inside of the third grade equestrian track, the radial velocity of the particle level is flat or slightly larger than the vertical. At the same time, 3D numerical simulation software 3DEC was used to analyze the vibration velocity, displacement and plastic zone condition of the slope under blasting load. The results were compared with the field monitoring results. The results show that the error between the calculated value and the measured value is less than 15%. Under the action of blasting load, the outer apex of the equatorial roadway is permanently displaced, but both are small and tend to be stable. The plastic zone is limited to the area around the blasting zone, The whole is stable.