环刀取样试验的步骤（Procedures for the sampling of ring knives）.docVIP

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环刀取样试验的步骤（Procedures for the sampling of ring knives）.doc

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环刀取样试验的步骤（Procedures for the sampling of ring knives）

环刀取样试验的步骤（Procedures for the sampling of ring knives） Ring cutter sampling rule: The requirement of foundation pit is one point every 100 square meters. The foundation pit is larger than 3000 square meters, take one point every 300 square meters Trench requirements every 50 meter to take a point. For the requirements of the humidity field to judge method: hand into a group, the hand does not come loose, fall flowering. Using ring knife to measure soil bulk density, steps are as follows: 1. first select the excavation of the soil profile location, and then dig soil profiles, according to the level of stratification, stratified sampling, repeated 3 times per layer. If only the soil bulk density of tillage layer is determined, the soil profile should not be excavated. 2. place the ring holder on the ring knife of the known weight and press the ring blade down vertically until the ring is filled with the sample. Ring knife into the smooth, consistent force. 3. place the earth knife holder on the ring knife of the known weight and press the ring blade down vertically until the ring is filled with the sample. Ring knife into the smooth, consistent force. 4. soil cut knife cutting ring around the soil, remove the ring knife has been filled with soil, carefully cut the cutting ring at both ends of the excess soil, and wipe the knife ring outside the earth. Ring knife at both ends immediately stamped, so as not to water evaporation. Weigh immediately (accurate to 0.01g) and record. 5. simultaneous sampling at the same level, sampling the aluminum box to determine the soil water content. Or take out the sample directly from the ring barrel and measure the soil moisture content. Results the soil bulk density was calculated by pressing type. D=g? 100/[V? (100+W)] Formula: D - soil bulk density (g/cm3); G - wet soil weight (g) in ring knife V - ring knife volume (cm3) W - sample water content (%) Pointed out that the lime soil cushion quality inspection process, part of the comp