67results about How to "Accurate pressure value" patented technology

The invention discloses a method for simultaneously testing effective stress coefficient and porosity of porous rock under the stress conditions. According to the test method, pores of a rock sample are pressurized through a pore pressure loading pump while position of a piston inside the pump is positioned and volume of a fluid inside the pump is recorded; pore volume data of the rock sample is obtained by the use of volume change data of the fluid inside the pump; and through a standard cylindrical steel sample calibration test, pore volume measurement errors caused by fluid volume consumption by a pore pressure loop of test equipment are eliminated. Effective stress coefficient and porosity of porous rock can be obtained by the utilization of rock strain data, stress data and pore volume change data during external load and pore pressure loading process. By changing different confining pressure conditions, bias conditions and pore pressures, effective stress coefficient and porosity of porous rock under different stress conditions can be tested.

An embodiment of the invention relates to a planar pressure detecting device, comprising: a first body and a second body, wherein the first body and the second body are movably connected by a connecting portion; the first body and the second body are both provided with plate-type pressure sensors that comprises: a first circuit board layer, a second circuit board layer, a first conductive strip group, a pressure-sensitive conductive material layer and a second conductive strip group; the first circuit board layer is provided with the first conductive strip group, the second circuit board layeris provided with the second conductive strip group; the first conductive strip group is in contact with the first surface of the pressure-sensitive conductive material layer, and the second conductive strip group is in contact with the second surface of the pressure-sensitive conductive material layer; the first conductive strip group and the second conductive strip group respectively comprise aplurality of mutually isolated conductive strips; and the projections of the conductive strips in the first conductive strip group and that of the conductive strips in the second conductive strip group cross on the pressure-sensitive conductive material layer.

The invention discloses a gas drainer and a method for realizing pressure tapping by using the gas drainer. The gas drainer is provided with N horizontal communicating vessels which are connected in series with one another, wherein water is filled in a water sealing chamber of each communicating vessel and a water sealing pipe is vertically arranged in the water sealing chamber; the lower end of each water sealing pipe is open; the upper ports of the second stage of water sealing pipe to the final stage of water sealing pipe are communicated with previous stages of water sealing chambers; the upper port of the first stage of communicating vessel is an inlet for receiving gas pressure; and the final stage of communicating vessel is provided with an outlet which is communicated with atmosphere. The method for realizing pressure tapping by using the gas drainer comprises the following steps that: the top of a water sealing chamber accommodating chamber between every two adjacent water sealing pipes is provided with a pressure tapping port; each port is provided with a sealed pressure tapping adjustment pipe which can adjust the length of the part inserted into plugging water within a vertical length L range; the pressure tapping port is directly formed above the first stage of water sealing pipe; or as required, extension length of the pressure tapping adjustment pipe at a corresponding port is adjusted to realize pressure tapping at the pressure tapping port, or the pressure tapping port is directly formed above the water sealing pipe of the first stage of communicating vessel to tap pressure Vmax. The method can expand the application of the gas drainer and can be easily mastered by operation personnel.

The application provides a tunnel deformation testing device including a bracket, an outer pipe assembly, a support rod, a collar, and a test rod assembly. One end of the test rod assembly is fixed on the outer wall of the collar, and the other end is fixed or supported on the tunnel wall; The test rod assembly includes a telescopic ruler. The telescopic ruler includes a main pipe, an auxiliary pipe and a return spring. The auxiliary pipe is inserted into the main pipe through the plug-in end of the main pipe and can be retracted into the main pipe. It is used to drive the auxiliary pipe to reset, and the outer pipe assembly wall of the auxiliary pipe is provided with an axial length scale line, and the length scale line is used to indicate the real-time length of the telescopic ruler. The displacement test device of the present application is simple to assemble, easy to operate, easy to fix the reference point, light in weight and easy to move, unlimited in monitoring points, comprehensive in monitoring range, high in monitoring accuracy, low in cost and reusable, and can be applied to tunnels under different conditions. Research.