Testing device and method for measuring sandy soil moving states under different liquefaction degrees

A technology of motion state and test device, applied in the field of geotechnical earthquake engineering, can solve the problems of poor stability, short time and high cost, and achieve the effect of reducing track size, simple method and convenient operation

CN103293082AInactive Publication Date: 2013-09-11HOHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-09-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a testing device and method for measuring the sandy soil moving states under different liquefaction degrees. The device comprises a model box, a working bench, a support, a speed regulating electromotor and a PIV (peak inverse voltage) platform, wherein the model box is internally provided with pulley blocks and steel wire ropes; the PIV platform is installed on one side out of a panel pasted with a transparent scale grid paper, and consists of two parts including a CCD (charged coupled device) digital camera and a camera support. A using method of the device comprises the following steps of: simulating liquefied sandy soil with different liquefaction degrees by adopting plastic sands with different gradations and a sodium chloride solution with specific density; dragging a carbon wire by the speed regulating electromotor; driving semi-spherical-body slide blocks to move horizontally by the pulley blocks; installing a pull force sensor at the vertical moving section; and measuring the moving state of plastic sand particles around during the moving process of the semi-spherical-body slide blocks by utilizing the PIV platform and the pull force sensor. The testing device and method for measuring the sandy soil moving states under different liquefaction degrees have the advantages that the liquefied sandy soil can be simulated under different pore pressure ratios according to actual requirements; the measurement accuracy is high; the operation is simple and feasible and the like.
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Description

technical field

[0001] The invention belongs to the technical field of geotechnical earthquake engineering, and in particular relates to a test device and method for measuring the movement state of sand and soil under different degrees of liquefaction. Background technique

[0002] Earthquake is one of the major natural disasters faced by human beings. In the past 20 years, there have been frequent seismic activities around the world, especially in the 2004 Indian Ocean earthquake and tsunami, the 2008 "5.12" Wenchuan earthquake in China and the 2011 "3.11" earthquake in Japan. , there are a large number of earthquake damages caused by sand liquefaction, which is manifested in that the ability of many buildings to resist deformation is significantly reduced due to the liquefaction of the saturated sand layer in the foundation, resulting in additional settlement of the foundation and soil layer, and the overturning of the structure and foundation , Tilting, cracking, sliding,...

Examples

Embodiment Construction

[0047] Such as figure 1 , figure 2 , image 3 and Figure 4 As shown, a test device for measuring the movement state of sand and soil under different degrees of liquefaction, including (1) speed regulating motor (2) tension sensor (3) carbon wire (4) model box (5) fixed pulley (6) hemisphere Body slider (7) earth pressure box (8) hole pressure box (9) steel wire rope (10) waterproof rubber ring (11) steel bracket (12) steel truss (13) bracket base (14) model box base (15) ) Workbench (16) Bolts (17) Saturated plastic sand solution (18) CCD digital camera (19) Support (20) Base (21) Camera bracket (22) Transparent scale grid paper.

[0048] The model box (4) is made of a transparent plexiglass panel, and the side of the model box close to the hemispherical slider is a panel with a 2cm×2cm transparent scale grid paper on the outer surface. Two small holes are drilled on the side panel of the model box, and the steel wire rope (9) passes through the small holes to be straig...