Device and method for testing internal frost-heave capacity of compacted soil

A test device and soil compaction technology, which is applied in the direction of soil material testing, material inspection, etc., can solve the problems of not being able to measure the amount of frost heaving deformation inside the soil, soil freezing, etc., to achieve true and effective test results, convenient operation, and structural simple effect

Inactive Publication Date: 2015-02-18
哈尔滨市市政工程设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that the frost heave deformation inside the soil cannot be measured and the soil can be frozen from top to bottom in the existing frost heave test process, the present invention further proposes a test device for the frost heave inside the compacted soil and test methods

Method used

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  • Device and method for testing internal frost-heave capacity of compacted soil
  • Device and method for testing internal frost-heave capacity of compacted soil
  • Device and method for testing internal frost-heave capacity of compacted soil

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specific Embodiment approach 1

[0019] Specific implementation mode one: combine Figure 1 to Figure 3 To illustrate this embodiment, a test device for frost heaving inside compacted soil described in this embodiment includes a square groove 1, a foam board 2, an insulation layer 3, a plurality of probes 12, a sleeve 4 and a needle feeding mechanism. The cross-section of the groove 1 is square, and the foam board 2 is evenly arranged on the inner surface of the square groove 1, and the inner side of the foam board 2 is uniformly provided with an insulation layer 3, and the center of the insulation layer 3 is provided with a soil-like circular groove 3-1 The bottom surface of the soil sample circular groove 3-1 is provided with a semipermeable membrane 3-2, and the lower end of the semipermeable membrane 3-2 is provided with a water replenishing layer 5, and the inner wall of the soil sample circular groove 3-1 is uniform in the axial direction. A plurality of temperature sensors 6 are arranged, and the sleev...

specific Embodiment approach 2

[0021] Specific implementation mode two: combination Figure 1 to Figure 3 Describe this embodiment. The needle feeding mechanism in this embodiment includes a rotary shaft 9, two inner groove cams 10 and a plurality of struts 11. The rotary shaft 9 is vertically arranged on the axis of the sleeve 4. The upper end of the rotary shaft 9 A positioning cover 9-1 is inserted, and the positioning cover 9-1 is rotationally connected with the rotary shaft 9. The positioning cover 9-1 cooperates with the top inner wall of the sleeve 4, and two ends of the rotary shaft 9 are respectively inserted with a Inner groove cam 10, two inner groove cams 10 are arranged in the same direction, and a plurality of struts 11 are evenly distributed on the outer circumference of each inner groove cam 10, and one end of each strut 11 matches the groove of inner groove cam 10 respectively , the other end of each pole 11 is respectively provided with a push plate 11-1, and each push plate 11-1 cooperate...

specific Embodiment approach 3

[0023] Specific implementation mode three: combination Figure 1 to Figure 3 To illustrate this embodiment, the length of each through slot 4 - 1 on the sleeve 4 in this embodiment is greater than the vertical distance between the top probe 12 and the bottom probe 12 . The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0024] With such a design, the probe 12 can be placed at any height, and at the same time, when the displacement of the probe 12 undergoes frost heave, the displacement of the probe 12 will not be affected due to the long length of the through groove 4-1. Make the measurement results more accurate.

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Abstract

The invention relates to a device and a method for testing the internal frost-heave capacity of compacted soil, relating to a device and a method for testing the frost-heave capacity. The device and the method are used for solving the following problems: the frost-heave deformation in a soil body cannot be tested in the existing frost-heave testing process and the soil body cannot be frosted from top to bottom. The device disclosed by the invention is characterized in that foam plates are uniformly arranged on the inner surface of a square tank; a thermal insulation layer is arranged at the inner side of each foam plate; a soil sample circular tank is arranged in the centre of the thermal insulation layer; a semi-permeable membrane is arranged on the bottom surface of the soil sample circular tank; a water replenishing layer is arranged at the lower end of the semi-permeable membrane; a plurality of temperature sensors are uniformly arranged on the inner side wall of the soil sample circular tank along the axial direction; a sleeve is inserted in the central axis of the soil sample circular tank; and a plurality of probes are uniformly distributed in the sleeve spirally. The method disclosed by the invention comprises the following steps: compacting and forming a test soil sample; fixing the test soil sample; feeding probes; measuring the initial heights of the probes; frosting the test soil sample; recording displacement variation; and calculating the frost-heave rate. The device and the method disclosed by the invention are used for testing the internal frost-heave capacity of compacted soil.

Description

technical field [0001] The invention relates to a test device and a test method for frost heave. Background technique [0002] my country has a vast territory and a large geographical span. The seasonally frozen areas account for 53% of the country's land area, including 14 provinces and regions. The seasonally frozen areas have nearly 25,000 kilometers of expressways and about 700,000 kilometers of graded roads. These roads experience different degrees of frost heave every winter, ranging from a few centimeters to more than ten centimeters. When the deformation of the pavement caused by frost heave exceeds the allowable deformation value of the material, the pavement will be cracked horizontally and vertically, heaved by frost heave, Phenomena such as broken boards will affect the quality of the road surface and reduce the service life of the road surface. [0003] Frost heave means that when the soil has a certain water content and the temperature drops below zero, the bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 韩春鹏李秋实王光崇武帅李铭忠孔高强李贵
Owner 哈尔滨市市政工程设计院有限公司
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