Field Verification of Millisecond Delay Blast Densification of Sand

实验室测试预测， 具有毫秒延迟的砂的爆炸致密化将至少 有效且产生较少振动， 大爆炸的重量等于延迟的总和。 在这 研究，冲击加速度计和动态压力计将测量 爆炸产生的地面运动和压力 一个荷兰圆锥 土壤湿度计和土壤湿度计将记录土壤 渗透阻力和模量随时间和距离 爆炸 爆炸能量，地面 运动，产生的压力，土壤改良的程度， 改善的空间范围和时间。 将进行评估 至于目前现场仪器的发展是否足够， 对于动态事件。

Laboratory tests have predicted that full-scale field blast-densification of sand with millisecond delays will be at least as effective and generate less vibration as densification by a single large blast equal in weight to the sum of the delays. In this research, shock accelerometers and dynamic piezometers will measure the ground motions and pressures generated by the blasts. A Dutch cone penetrometer and a dilatometer will record changes in the soil's penetration resistance and modulus with time and distance from the blast. Relationships will be drawn between explosive energy, ground motion, generated pressures, the degree of soil improvement, the spatial extent of the improvement, and time. Assessments will be made as to whether current developments in situ instrumentation are adequate for dynamic events.