Failure of heavy clayey soil layers by explosives. (Part 1) Dotted blasting.:Dotted Blasting

概要

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We experimented with sewage sludge and explosives to improve the physical properties of heavy clayey soil. The layers were tilled to a depth of 1m in order to lower stagnant water level and to accelerate the maturing of heavy clayey soil. Predicting the same effects with this tillage, explosives were buried automatically by a machine which would produce a deep ditch by injecting pressurized sewagesludge, and then the soil layer was loosened by the power of explosives. In order to collect basic experimental data, explosives were buried in the heavy clayey soil and blasting tests (dotted blasting) were carried out.In conclusion, if the quantity of the charged explosives was not enough, there was no change in the soil surface but a cavity was produced in the soil layer. A larger quantity of charged explosive produced upheaving of the soil surface and a larger surface of soil failure in the soil layer. The much more powerful explosives produced a scattering of the soil. The proper quantity of explosives to disrupt heavy clayey soil was empirically given by Lp=0.292W3[kg].
農業機械学会の論文