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Indoor simultaneous determination device and method of piping critical hydraulic gradient and particle wastage rate

A critical hydraulic gradient and particle loss technology, applied in soil material testing, material inspection products, etc., can solve problems such as particle loss rate of soil that has not yet formed mature piping, inability to obtain piping, etc., to save measurement costs, improve preparation, time saving effect

Inactive Publication Date: 2015-02-11
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the laboratory test methods for piping only focus on the determination of the critical conditions of piping, and the relevant parameters that characterize the development speed of piping cannot be obtained only through the critical hydraulic gradient. At the same time, no mature measurement technology for the particle loss rate of piping soil

Method used

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  • Indoor simultaneous determination device and method of piping critical hydraulic gradient and particle wastage rate
  • Indoor simultaneous determination device and method of piping critical hydraulic gradient and particle wastage rate
  • Indoor simultaneous determination device and method of piping critical hydraulic gradient and particle wastage rate

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Embodiment 1

[0046] figure 1 is a flowchart of the method involved in the present invention, figure 2 It is a structural diagram of the device involved in the present invention, image 3 is the soil gradation curve diagram of the sample in the running process of the present invention, Figure 4 is the parameter index data of the sample in the running process of the present invention, Figure 5 It is a graph of the relationship between the critical hydraulic gradient and particle composition and initial porosity during the operation of the present invention, Image 6 It is a graph of the relationship between particle loss law and particle A composition and initial porosity during the operation of the present invention, Figure 7 It is a graph of the relationship between particle loss law and particle B composition and initial porosity during the operation of the present invention, Figure 8 It is a graph showing the relationship between particle loss law and particle C composition and...

Embodiment 2

[0083] The difference between this embodiment and embodiment 1 is only:

[0084]The test device provided in this embodiment includes a model cylinder for accommodating samples, a sand and water collection device, a downstream water collection tank, and a collection and measurement system for gushing soil particles. The model cylinder is placed vertically, with a cylinder height of 50 cm and a diameter of 14 cm; the water inlet at the bottom of the model cylinder provides the upstream seepage drive water head; A sand-separating water-permeable board is installed between the buffer zone and the sample, and the sample is installed on the sand-separating water-permeable board. The height of the sample is 40cm, and the top surface of the sample is flush with the top of the model tube; the side of the model tube is set every 5cm. The pore water pressure sensor is used to measure the change of pore water pressure at different positions in the sample; the pore water pressure sensor is...

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Abstract

The invention discloses an indoor simultaneous determination device and method of piping critical hydraulic gradient and particle wastage rate. The determination device comprises a model cylinder for accommodating a sample, a sand-water collecting box for collecting water and soil particles gushed from the model cylinder, a downstream water collecting tank for separating the water and soil particles collected, and a data collecting system. The data collecting system is used to acquire a pressure change value of the model cylinder, a flow value of the downstream water collecting tank and a weight value of the soil particle gushed. According to the invention, the particle wastage rate is effectively determined in the soil piping process. The piping critical hydraulic gradient and the particle wastage rate can be determined, the determination cost is saved, the time required for determination is saved, and the efficiency is improved. The accuracy of the determination result is improved, the impact of initial porosity, hydraulic gradient, soil components and the like on the soil particle wastage rate in the piping process can be determined.

Description

technical field [0001] The invention relates to the technical field of indoor testing of geotechnical parameters, in particular to an indoor test joint measurement method and a measurement device for a non-cohesive soil piping critical hydraulic gradient and particle loss law in geotechnical engineering. Background technique [0002] Piping is a phenomenon in which fine particles of soil are carried out along the pores formed by skeleton particles under the action of seepage, and it is the main cause of damage to embankments and floods. Piping is an important form of seepage damage in cohesive soils where piping mainly occurs. Every year, there are a large number of dam damage accidents caused by piping all over the world, which seriously threaten the safety of people's lives and property. Therefore, the prevention and early warning of piping is an important issue related to people's livelihood. Mastering the judging conditions of piping occurrence is the primary issue for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 梁越王俊杰刘明维刘楠楠
Owner CHONGQING JIAOTONG UNIVERSITY
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