METHOD FOR IN-SITU DETERMINING THE COMPACTNESS OF GRAINY MATERIAL LAYERS AND DEVICE FOR PERFORMING THE PROCESS
The object of the invention is a device for in-situ determining the compactness of grainy material layers, especially determining the compactness of material layers containing equally solid part, liquid and gaseous phases e. g. soils, that consists of a guide body, a loading disc connected with the guide body and a dropping-weight movable relating the loading disc along the guide body. The characteric feature of the device is that an indicator figure (20) is adjusted to a dropping weight (13), the indicator figure (20) has a guide organ (21), wherein one of the guide organs (21) and the guide body (11) are at least periodically in a connection with each other restricting the direction of movement and the guide body (11) is complemented with a length measuring unit (30). Furthermore, the object of the invention is also a method for in-situ determining the compactness of grainy material layers, especially determining the compactness of material layers containing equally solid part, liquid and gaseous phases e. g. soils; using a device consisting of a loading disc connected with a guide body and a dropping- weight movable relating the loading disc along the guide body, as measuring tool. The loading disc is placed on the surface of the material layer to be examined, then with the help of the dropping weight deforming impact energy of given value is transmitted to the loading disc, and following it the compactness of the material layer is determined. The characteristic part of the method of the invention is that before transmitting the deforming impact energy we associate the dropping weight (13) with the indicator figure (20), then after transmitting the deforming impact energy to the loading disc we determine the value of recoiling of the dropping weight (13) from the loading disc with the help of the indicator figure (20) and we establish the compactness of the material layer under the loading disc (12) on the base of recoiling value.