| 摘要 |
PURPOSE:To easily measure the compactness of soil on site by a method in which the compactness of wet soil is obtained from the volume of a test hole and the weight of soil sampled by excavation from the test hole, and the dryness of the soil is obtained from the compactness and water content of wet soil. CONSTITUTION:A rubber balloon 7 is provided to a container of a volume V1. A piston 6b is pushed to add a pressure to the balloon 7, the value (r1) of a volume-indicating graduation 6e when the balloon 7 is maximumly expanded is read, and the value (r2) for a volume V2 is also read. A comparision constant K is obtained by the following formula. K=V2-V1/r2-r1(cm<3>). The initial value (r0) of the graduation 6e for a container of V0 is read, and a test hole 10 is excavated to take soil of a weight (m). The water content W of the soil is obtained, and the value (r3) when the balloon 7 is expanded in the hole 10 until the graduation 6e becomes unchanged is read. The compactness Pt of wet soil on site is obtained by the following formula. V=V0+K(r3-r0)-C, where V is volume of the hole 10 and C is volume of the hole 2a of a plate 2. Pt=m/V(t/cm<3>) and Pd (dry compactness) = Pt/(W+100)X100(t/cm<3>). |
