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Device and method for measuring saturated and unsaturated strength of polluted soil

A technology of saturation strength and measuring device, which is applied in the direction of measuring device, strength characteristics, and the use of stable tension/pressure test material strength, etc., to achieve high precision, accurate water exchange, and improve the effect of test accuracy

Active Publication Date: 2020-08-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a device and method for measuring saturated and unsaturated strength parameters of contaminated soil, so as to solve the problem of contaminated soil under multi-factor coupling conditions that cannot be realized by traditional test devices. Monitoring of the change process of body strength parameters, and real-time monitoring of the evolution law of deformation parameters of polluted soil

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  • Device and method for measuring saturated and unsaturated strength of polluted soil
  • Device and method for measuring saturated and unsaturated strength of polluted soil
  • Device and method for measuring saturated and unsaturated strength of polluted soil

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Embodiment 1

[0038] Such as Figure 1-Figure 3 As shown, Embodiment 1 of the present invention provides a device for measuring saturated and unsaturated strength of contaminated soil, which includes a sample column 1, a gas phase suction control module 2, a membrane suction control module 3, and a loading module 4. The sample column 1 has a cylindrical structure, and the sample soil body 5 is set in the sample column. There is a permeable stone 6 at the top and bottom of the sample column 1. The permeable stone 6 can penetrate the solution and prevent the soil Body particles pass.

[0039] During the test, the sample column 1 is vertically installed on a supporting structure. The supporting structure includes a base 7 set on the ground. A plurality of vertical studs 8 are fixedly installed on the base 7 and a disk-shaped stud 8 is installed on the base 7 together. The piston 9 and the stud 8 pass through the corresponding installation through hole opened on the piston 9. The bottom end of th...

Embodiment 2

[0049] Embodiment 2 of the present invention provides a method for measuring the saturation strength of contaminated soil, including:

[0050] Step one: Assemble the device. Load the sample soil sample 5, permeable stone 6, etc. into the sample column 1, use the clamp 29 and the sealing strip 30 to clamp the sample column 1 and seal the interface to ensure the sealing of the test device Sex. Mount the sample column 1 upright on the supporting structure, and tighten the nut 10 so that the base 7 and the piston 9 clamp and fix the sample column 1. Finally, install the gas phase suction control module 2 and the membrane suction control module 3 (without installing the PEG film 21), and at the same time make the first vent tube 13 communicate with the top of the sample column 1, and the second vent tube 14 connects the top of the sample column 1 with The bottom end is connected, the first liquid pipe 15 is connected to the bottom end of the sample column 1, and the second liquid pip...

Embodiment 3

[0055] Embodiment 3 of the present invention provides a method for measuring the unsaturated strength of contaminated soil, in which the gas phase method is used to control the suction of the sample soil to perform the unsaturated strength measurement, which specifically includes:

[0056] Step one is device assembly, which is the same as step one in embodiment 2.

[0057] Step two includes the process of gas-phase suction control, specifically: turn on the gas source 17, the gas pump 18 and the peristaltic pump 20, the chemical solution bottle is filled with saturated salt solution, turn on the switch AE, and adjust the interoperability between the sample soil 5 and the gas , Let the migration and exchange of water be completed by steam, make the sample soil 5 in a natural state, and simulate the change process of suction in the unsaturated state of the contaminated soil. When the sample reaches the suction balance, it is based on the Kelvin formula (Where p is the actual vapor pr...

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Abstract

The invention provides a device for measuring saturated and unsaturated strength of polluted soil. The device comprises a sample column, a gas-phase suction control module, a membrane suction controlmodule and a loading module, wherein a sample soil body is arranged in the sample column, permeable stones are arranged at the two ends of the sample column respectively, the sample column is arrangedon a supporting structure and clamped and fixed through the supporting structure, the gas-phase suction control module controls the suction of the sample soil body through adoption of a gas-phase method, the membrane suction control module controls the suction of the sample soil body through a semipermeable membrane, and the loading module can load pressure to the sample column. According to thedevice, high reduction of an actual polluted site, effective control of suction and measurement and recording of the whole process of saturated / unsaturated strength parameters and deformation characteristic change rules of the polluted soil body are realized, and the device and the method have relatively high application value in strength test research of the polluted soil body in an industrial polluted site.

Description

Technical field [0001] The invention relates to the technical fields of geological engineering and geotechnical engineering, and particularly relates to a saturated / unsaturated strength parameter measuring device and a measuring method based on contaminated soil. Background technique [0002] In recent years, with the expansion of my country’s urban construction and the adjustment of industrial layout, high-polluting and high-energy-consuming enterprises in the central area of ​​the city, such as machinery manufacturing, chemical smelting, and non-ferrous mining, have all implemented enterprise relocation, due to the obsolete equipment and industrial emissions The imperfect technology has caused a large amount of heavy metals and other pollutants to enter the groundwater and soil, seriously affecting the surrounding ecological environment, and posing a serious threat to human health and sustainable social development. Therefore, how to deal with and control heavy metal-contaminate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0019G01N2203/0044
Inventor 贺勇蒋文强张可能李建中陈科平张闯朱考飞
Owner CENT SOUTH UNIV
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