Vacuum preloading underground water level measurement device and method

Abstract

The invention discloses a vacuum preloading underground water level measurement device which comprises a water level pipe, a forward and backward rotation motor, a water level probe and a recording apparatus. The water level pipe is embedded in a soil body. A coil pulley is arranged at the lower portion of the forward and backward rotation motor and connected with a rotating shaft of the forward and backward rotation motor. Wires of control circuits are wound around the coil pulley. The recording apparatus is arranged on the coil pulley. The lower portions of the wires of the control circuits are connected with the water level probe. Two pairs of electrical connecting points are arranged on the water level probe and connected with the two control circuits. The invention further discloses a vacuum preloading underground water level measurement method. The elevation between the coil pulley and the ground is measured, the changes of the wires, namely, the changes of the height of the probe, are measured through the recording apparatus, and therefore the underground water level elevation can be indirectly obtained. The vacuum preloading underground water level measurement device is isolated from the atmosphere, it is ensured that the water level and air pressure of soil bodies in and around the water level pipe are consistent, and meanwhile the underground water level height is automatically measured so that errors can be reduced as mush as possible.

Description

technical field [0001] The invention relates to a groundwater level measuring device and method, in particular to a vacuum preloading groundwater level measuring device and method. Background technique [0002] The vacuum preloading method has been used in a large number of projects in our country. However, some theoretical researches on the vacuum preloading method still have some problems. Whether or not the groundwater level drops during the vacuum preloading process is related to whether the vacuum preloading method has the effect of precipitation preloading in addition to the effect of vacuum transforming the effective stress of the soil, it is important to evaluate the effect of vacuum preloading and study the reinforcement mechanism. important content and basis, so it is of great significance. In actual engineering, the traditional groundwater level measurement method is: first set up a water level pipe, and then measure it with a water level gauge. However, when th...

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Problems solved by technology

However, this method has a certain hysteresis phenomenon, the error is large when calculating the area, and the design is not sealed

Chinese patent (patent application number: 200720187132.5) discloses "a device for indirect measurement of groundwater level" using a resistive water level probe to measure groundwater level in a sealed water level pipe, but the sealing effect of the device is questionable and the operation is cumbersome

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