Test device and test method for simulating dam piping under high water-level condition

A simulation test, high water level technology, applied in measuring devices, soil material testing, material inspection products, etc., can solve problems such as the inability to effectively observe the change law of sand gushing time during the development and change of piping, and achieve fast monitoring and test error tolerance. High, simple principle effect

Pending Publication Date: 2019-09-24
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional test devices are limited by size and observation, and can only determine the critical water head, and cannot effectively observe the development and change of piping and the law of sand gushing over time, etc.

Method used

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  • Test device and test method for simulating dam piping under high water-level condition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A dam piping simulation test device at a high water level, the device includes a test box, the test box is separated into a closed water storage chamber 6 and a soil sample filling room with an upper end opening through a permeable partition 7, and the soil sample filling room The test sand layer 9 with a certain thickness is filled indoors as required, in some embodiments, such as figure 1 As shown, the bottom of the test sand layer 9 is filled with a sand and gravel cushion 8, and the top is provided with a clay covering layer 10. Inside the test sand layer 9, colored glass beads 12, pore water pressure sensors 13 and coarse sand isolation belts 11 are arranged at different positions along the nozzle axis; Outlet 14, the piping outlet 14 is connected and drawn out through the water and sand discharge pipeline 15; Funnel 16; the funnel 16 is provided with a filtering device, and the filtered water is discharged through the drainage conduit at the bottom of the funnel ...

Embodiment 2

[0043] This embodiment is the test method of the embankment piping simulation test device under the high water level in the first embodiment, comprising the following steps:

[0044] 1) Fill a certain thick soil layer in the soil sample filling room according to the demand. The bottom layer is filled with sand and gravel cushion layer 8, the middle layer is the test sand layer 9, and the surface layer is laid with clay covering layer 10; 9 Lay three rows of colored glass beads 12 along the axial direction, and bury pore water pressure sensors 13 and coarse sand isolation belts 11 in the test sand layer 9 at the same time.

[0045] 2) Turn on the water pump 2 to pump water from the water storage tank 1 into the pressure regulating water tank 4, the water flows into the water storage chamber 6 through the pipeline, keep the permeable partition 7 closed, and open the permeable partition when the water level in the water storage chamber 6 rises to the required height Plate 7 was t...

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Abstract

The invention discloses a test device and test method for simulating dam piping under a high water-level condition. A test box is divided into a water storage chamber and a soil sample filling chamber through a water permeable partition plate; a valve ball is arranged in a pressure regulating water tank; the height of the valve ball can be adjusted; the water inlet of the water storage chamber is communicated with the water outlet of the pressure regulating water tank through a pipeline; the pressure regulating water tank can be adopted to supply water and regulate the pressure of the water; the height of the pressure regulating water tank is adjustable; the switching on and switching off of a water pump are controlled through the valve ball in the pressure regulating water tank; the pressure regulating water tank and the valve ball are matched with each other so as to accurately control the water level height of the water storage chamber; a sand gravel cushion layer is laid at the bottom of the soil sample filling chamber; a test sandy soil layer is arranged on the upper surface of the sand gravel cushion layer; a pore water pressure sensor is buried in the test sandy soil layer; color glass beads are laid on the top of the test sand layer along an axis direction; the colored glass beads are used for tracing the upstream development trajectory of piping; a piping outlet is communicated and led out through a water-sand discharging pipeline; and a funnel for collecting gushing sand is arranged below the outlet of the water-sand discharging pipeline.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a embankment piping simulation test device and test method under high water level. Background technique [0002] Piping is a serious hazard in the seepage failure of dams, and its development mechanism is as follows: due to the high upstream water head, the seepage slope of the sand layer of the dam foundation exceeds the allowable value, and part of the sand gushes out downstream; with the occurrence of sand gushing at the outlet, the shortened The base seepage diameter and the increased seepage slope of the base sand layer will further intensify the sand gushing at the outlet until the dam fails. It is of great significance to study piping tests in sandy soil layers of embankment foundations for piping protection and emergency response. Among them, determining the critical water head for piping in sandy soil layers and the relationship between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N15/08
CPCG01N15/082G01N33/24
Inventor 李子阳马福恒叶伟胡江邱莉婷霍吉祥陈诚成荣亮
Owner NANJING HYDRAULIC RES INST
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