并行电法技术在爆破振动影响庵基山塘大坝渗流稳定性分析中的应用

Application of Impact Analysis of Blasting Vibration on Seepage Stability of Anji Small Reservoir Dam Based on Parallel Electrical Method

工程钻爆法施工会对邻近既有建筑物产生振动影响,因此有必要评价结构体的安全。以某隧洞爆破作用对庵基山塘大坝渗流稳定性评价为例,引进并行电法技术评估大坝开展爆破施工前、施工过程中及爆破影响区外的渗流性态,并与实测的大坝水位数据进行对比分析。地电场的监测成果表明,大坝电阻率在爆破施工过程中变化较小,结合测压管中的水位过程线可知,大坝在爆破施工结束后仍处于相对稳定状态。可见电阻率可反映内部渗流场的变化规律,为土石坝爆破损伤评价提供了依据。

The construction of drilling and blasting method influences the vibration of the adjacent existing buildings.Therefore,it is necessary to conduct the safety assessment of structures.Based on the evaluation of seepage stability of Anji small reservoir by the blasting effect of a tunnel,the parallel electric method technology was introduced to evaluate the seepage behavior of the dam before,during and outside the affected area of blasting.Besides,it was compared and analyzed with the measured water level data.According to the monitoring results of the electric field,the resistivity of the dam changes relatively slightly in the blasting process.Combined with the water level process line in the pressure tube,it indicates that the dam is still in a relatively stable state after the blasting process.The experiment results show that resistivity can monitor the change rule of internal seepage field,and provide evidence for the evaluation of blasting damage of earth-rock dam.