粘土中柱状药包爆炸压密区的土性变化规律研究

Study on the Change Regularity of Soil Properties in Compaction Area under Column Charge Blasting in Clay

通过粘土中不同直径柱状药包的现场爆破试验,分析了爆炸压密范围及该区内土介质密度、含水量和抗剪强度的变化规律。结果表明:压密区半径约为药包直径的25～35倍,其大小与药量平方根成正比,与不耦合系数成指数关系。土介质密度、含水量和抗剪强度随径向距离增加先增大后减小。其中,平均压密系数范围为1.03～1.06,最大压密系数范围为1.030～1.095,最大压密位置在约16～18倍药包直径处;含水量出现降低区、升高区和恢复区,含水量在18～24倍药包直径处达到最大值,提高的最大百分比范围约为3.5%～9.7%;压密区内土介质剪切强度有所提高。

According to the blasting tests of column charge under different charge diameter in clay, the zone of explosion compaction and the change regularity of the density, water content and shearing strength of clay in this zone were analyzed. The results showed that the compaction area radius was about 25 to 35 times of charge diameter. It was proportional to dosage square-root and increased in positive exponent with decouple coefficient. The density, water content and shearing strength increased at first and then decreased with the increase of radial distance. The range of the average compaction coefficient was from 1.03 to 1.06, and the range of the maximum compaction coefficient was from 1.030 to 1.095. The maximum density was reached at about 16 to 18 times of charge diameterl there are lower area, higher area and restoration area of moisture content, the maximum point of moisture content was reached at about 16 to 18 times of charge diameter, the maximum increase percentage was about 3.5% to 9.7%; the shearing strength of medium in the soil compaction area was increased.