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Penetrating-stretching type pore water pressure measurement device and measurement method thereof

A pore water pressure and measuring device technology, which is applied in the direction of fluid pressure measurement using liquid as a pressure-sensitive medium, can solve the problems of difficulty in ensuring the installation requirements of piezometric tubes, large variability, etc., and achieve simple and easy implementation and operation of the measurement method Convenience and simple device structure

Inactive Publication Date: 2012-07-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former uses the wired conduction method to convert the deformation signal of the pore water pressure sensor probe into an electrical signal of resistance change, and then transmits the electrical signal to the user. The disadvantage of this method is that the collected data is affected by many factors through indirect measurement. Influence, great variability, such as the aging of the sensor, expensive costs, only suitable for short-term use in key projects; The disadvantage of measuring pore water pressure is that it is not easy to ensure the installation requirements of piezometric tubes, such as verticality, airtightness and connectivity of sealing quality, etc., which also directly affect the monitoring data results

Method used

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  • Penetrating-stretching type pore water pressure measurement device and measurement method thereof
  • Penetrating-stretching type pore water pressure measurement device and measurement method thereof
  • Penetrating-stretching type pore water pressure measurement device and measurement method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In a construction site in Jilin, the conical penetrating head 4 is first connected with the water filter pipe 2 through pins. The water filter pipe 2 is a PVC pipe, and the filter paper is wrapped around the water filter pipe 2. The pipe 3 is tightly pressed on the shoulder of the tapered penetrating head 4 through the gasket 5, the water filter pipe 2 is slidingly matched with the sleeve pipe 3, the bottom end of the pipe 6 is nested on the sleeve pipe 3, and the diameter of the water filter pipe 2 is 2.0 cm, the diameter of the water seepage hole 7 on the filter pipe 2 is 1 mm, and the distance between the water seepage holes 7 is 2 cm,

[0042] The measurement method of the penetration-extension pore water pressure measuring device comprises the following sequence and steps:

[0043] a. Before the test, the pore water pressure probe 1 and the upper connected conduit 6 are driven into the design depth of the test soil layer by static penetration equipment or impactor;...

Embodiment 2

[0059] At a construction site where a foundation pit was excavated in Tianjin, the conical penetrating head 4 is first connected to the water filter pipe 2 through threads or pins, and the bottom end of the conduit 6 is threaded or nested on the casing 3, and the water filter pipe 2 is equipped with a sleeve The pipe 3, the water filter pipe 2 and the sleeve pipe 3 are slidingly matched, and the sleeve pipe 3 is tightly pressed on the shoulder of the tapered penetrating head 4 through the gasket 5.

[0060] The water filter pipe 2 is provided with water seepage holes 7, and the water seepage holes 7 are equally spaced or irregularly distributed on the water filter pipe 2. The diameter of the water seepage holes 7 is 1.5mm, and the distance between the water seepage holes 7 is 3cm. The diameter of the water filter pipe 2 is 2.0cm. The water pipe 2 is wrapped with filter paper, and the water filter pipe 2 is a PVC pipe, a polyester pipe or a metal pipe.

[0061] The measurement ...

Embodiment 3

[0078] In a reservoir in Tibet, the conical penetrating head 4 is first connected to the filter pipe 2 through threads or pins, the bottom end of the conduit 6 is threaded or nested on the casing 3, the casing 3 is installed outside the filter pipe 2, and the filter pipe 2 Slidingly matched with the casing 3, the casing 3 is tightly pressed on the shoulder of the tapered penetrating head 4 through the washer 5.

[0079] The water filter pipe 2 is provided with seepage holes 7, and the water seepage holes 7 are equally spaced or irregularly distributed on the water filter pipe 2. The diameter of the water seepage holes 7 is 2 mm, and the distance between the water seepage holes 7 is 5 cm. The diameter of the water filter pipe 2 is 2.0 cm. 2 are wrapped with filter paper outside, and the water filter pipe 2 is an iron pipe.

[0080] The measurement method of the penetration-extension pore water pressure measuring device comprises the following sequence and steps:

[0081] a. Be...

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Abstract

The invention relates to a penetrating-stretching type pore water pressure measurement device and a measurement method thereof. A projecting segment of a taper penetration head is inserted into a filter pipe and is connected with the filter pipe through a screw thread or a pin. The filter pipe is externally provided with a sleeve pipe and is in sliding fit with the sleeve pipe. The sleeve pipe is tightly pressed on a shoulder of the sleeve pipe and the taper penetration head through a gasket. A bottom of a conduit is arranged on an upper end of the sleeve pipe through screw thread or nestification. According to the device and the method, problems that pore water pressure monitoring and measurement are complex and data is not direct in a saturated soft soil distribution region are solved, the device and the method are especially suitable for the pore water pressure monitoring and measurement of a fine grain soil layer with formation reasons of a fourth system river delta phase, an oxbow lake phase, a lake phase, a lagoon phase, a marsh phase and the like, measurement of a groundwater table, a perched water level and a confined water head of underground water, underground water monitoring, and water quality layered monitoring and sampling of an underground water environment. Compared with the prior art, the device has the advantages of simple structure, low cost, practicality and convenience, and the measurement method has the advantages of convenience, easy enforcement, convenient operation and reliable data.

Description

technical field [0001] The invention relates to a monitoring instrument, in particular to a direct measuring device and a measuring method for measuring pore water pressure in a soil layer. Background technique [0002] In the field of engineering construction activities in water-saturated soft soil distribution areas, it is often necessary to monitor the dynamic changes of pore water pressure and groundwater level in the soil. For example, in the dam construction of water conservancy projects in soft soil distribution areas, the pore water pressure of the dam foundation should be monitored from time to time, and the construction progress should be determined according to the dynamic changes of pore water pressure in different time periods; The same is true for underground pore water pressure monitoring during filling or foundation pit excavation; there are two commonly used pore water pressure monitoring and measurement methods, one is to use pore water pressure sensors bur...

Claims

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Application Information

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IPC IPC(8): G01L7/18
Inventor 王钢城王媛媛刘冲徐文明赵淑云黄超杨兆华许晓惠
Owner JILIN UNIV
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