Post-embedded monitoring device capable of simultaneously measuring seepage pressure of groundwater at multiple points

Abstract

The invention discloses a post-embedded monitoring device capable of simultaneously measuring the seepage pressure of groundwater at multiple points. The monitoring device mainly comprises a measuring unit and a sealing unit. The measuring unit is composed of a seepage pressure measuring unit outer pipe, a top isolation bracket, a middle bracket, a sealing material, a line pipe, an osmometer body, a permeable stone, and an osmometer data line. The sealing unit is composed of a sealing unit main pipe, a rubber capsule, a grouting pipe, and an exhaust pipe. The measuring unit and the sealing unit can be expanded by connecting heads and connecting bolts to realize simultaneous measurement at multiple points and to measure and monitor the seepage pressure of groundwater in different water-bearing layers or at different positions of the same water-bearing layer. The monitoring device can be embedded into a position needing measuring and monitoring through drilling in the late period to measure and monitor the pressure of groundwater. The monitoring device can meet the requirements for distribution and location measurement of different water-bearing layers. The monitoring device can be used to measure and monitor the seepage pressure in multiple layers or at multiple positions. The monitoring device is simple in installation, and is convenient and reliable.

Description

technical field [0001] The invention relates to the fields of underground engineering and groundwater, in particular to a post-buried monitoring device capable of simultaneously measuring groundwater seepage pressure at multiple points. Background technique [0002] During the investigation, construction and operation of underground engineering, for design and monitoring purposes, real-time monitoring of groundwater seepage pressure in rock mass is required for lining design, water inflow calculation, leakage analysis, lining stability evaluation, etc. At present, the groundwater pressure in the rock mass is mainly measured by embedding piezometers in boreholes. However, in the process of embedding piezometers, it is necessary to backfill the drill hole with cement grout to prevent water leakage from the orifice and affect the measurement accuracy. At the same time, it is necessary to backfill a certain thickness of filter material at the top of the piezometer, so that the g...

AI Technical Summary

Problems solved by technology

In the above process, the technical and experience requirements for construction personnel are relatively high. If the quality of cement grout backfilling and backfilling of filter materials cannot be guaranteed, there is a high possibility that the installation of the piezometer will fail or the measured readings are not in-situ groundwater seepage. Pressure value, disturbance affects engineering calculation and judgment

[0003] In addition, at present, only one piezometer can be buried in a single borehole in geotechnical engineering. If it is necessary to measure the seepage pressure at different parts in the same borehole of deep rock mass, different boreholes need to be drilled, which will increase the project cost and prolong the project period.

Based on the above analysis, the current underground engineering rock mass seepage pressure monitoring device has many deficiencies, including: first, the construction quality of cement grout backfill grouting is difficult to control; second, the backfill quality of reverse filter materials cannot be guaranteed; third, Simultaneous monitoring of seepage pressure in different aquifers or different locations is not possible

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