CN-116908404-B - Measurement system for laboratory bore pressure response and seabed liquefaction standard experiment and use method

CN116908404BCN 116908404 BCN116908404 BCN 116908404BCN-116908404-B

Abstract

The invention relates to a measuring system and a using method for laboratory hole pressure response and seabed liquefaction standard experiments, wherein the measuring system comprises a sand fixing structure for inhibiting model seabed deformation, the sand fixing structure comprises a sand fixing net, a second sliding rail, a third sliding rail and a scroll, a first side bar of the sand fixing net is pulled by the scroll position, the second side bar and the third side bar slide relative to the second sliding rail and the third sliding rail until the formed sand fixing net can cover the model seabed, the formed sand fixing net is fixed on the second sliding rail or the third sliding rail through fixing clamps, a hole pressure meter is fixed on the formed sand fixing net and used for measuring hole pressure response and liquefaction working conditions of a model seabed area covered by the sand fixing net, and the measuring system is suitable for hole pressure response and seabed liquefaction standard experiments and can effectively avoid influence of deformation of the seabed on experimental data in the experimental process.

Inventors

Sui Diaodiao
WANG GUANGSHENG
ZHU HANG
LI YOUJIA
ZHANG CHI
ZHENG JINHAI
GUAN DAWEI

Assignees

河海大学
中国港湾工程有限责任公司

Dates

Publication Date: 20260505
Application Date: 20230615

Claims (3)

1. The measuring system for laboratory bore pressure response and seabed liquefaction standard experiments is characterized by comprising a sand fixing structure for inhibiting model seabed deformation, wherein the sand fixing structure comprises a sand fixing net, a second sliding rail, a third sliding rail and a scroll, the sand fixing net is made of metal or plastic, and the aperture size of the sand fixing net is equal to the grain size of model seabed sand; The four sides of the sand fixing net are defined as a first side bar, a second side bar, a third side bar and a fourth side bar respectively, the first side bar, the second side bar, the fourth side bar and the third side bar are arranged in sequence, the fourth side bar is connected with the scroll and is parallel to the central axis of the scroll, the second side bar and the third side bar are embedded in grooves of a second slide rail and a third slide rail respectively, and meanwhile the second side bar and the third side bar are in sliding connection with the corresponding slide rail and are arranged in parallel; The first side strips of the sand fixing net are pulled by the scroll positions, the second side strips and the third side strips slide relative to the second slide rail and the third slide rail until the formed sand fixing net can cover the model seabed, and the formed sand fixing net is fixed on the second slide rail or the third slide rail through the fixing clamps; the measuring system also comprises a pore pressure meter which is fixed on the formed sand fixing net and is used for measuring pore pressure response and liquefaction working conditions of the model seabed area covered by the sand fixing net; the fixing clamp comprises a clamp body part, wherein one end of a transverse part of the clamp body part extends outwards and is bent to form a clamping groove, and the clamping groove is clamped on the first sliding rail or the second sliding rail; The center positions of the two ends of the scroll are respectively fixed with a toothed fixed block, and the toothed fixed blocks are provided with toothed structures along the radial direction outside the columnar blocks; The end parts of the first slide rail and the second slide rail are respectively matched with the toothed fixed blocks corresponding to the end parts of the reels, the reels are rotated, and the toothed structures of the reels are meshed with the end parts of the first slide rail or the second slide rail for rotation.
2. The measuring system for laboratory pore pressure response and seabed liquefaction standard experiment as claimed in claim 1, wherein the measuring end of the pore pressure meter is buried in a model seabed covered by a sand fixation net and is communicated with the data box through a data line.
3. The method for using the measuring system for laboratory pore pressure response and seabed liquefaction standard experiment according to claim 1 is characterized by comprising the following steps: s1, selecting metal or plastic according to the size of soil particle size in a model seabed to manufacture a sand fixation net with matched aperture; step S2, connecting a fourth edge strip of the sand fixation net with a scroll; and S3, pulling a first side bar positioned outside the sand fixing net, sliding a second side bar and a third side bar of the sand fixing net in a corresponding second sliding rail and a third sliding rail, and fixing the sand fixing net on the second sliding rail or the third sliding rail by adopting a fixing frame after the pulled-out length of the sand fixing net reaches the experimental preset length.

Description

Measurement system for laboratory bore pressure response and seabed liquefaction standard experiment and use method Technical Field The invention relates to a measuring system for laboratory pore pressure response and seabed liquefaction standard experiments and a using method thereof, belongs to the field of pore pressure measuring devices, and is suitable for pore pressure response and seabed liquefaction standard experiments. Background In the field of coastal and wave-related research, standard experiments often need to be set up for deduction and validation, which usually refers to validation experiments performed under laboratory conditions, and are characterized by strictly controlling independent variables and programmatically manipulating independent variables to observe the variation of dependent variables, as compared with experiments under natural conditions. Standard experiments are often used in the fields of research on dynamic response of the seabed under long-period wave load and soil liquefaction, a digital model and a physical model are usually adopted in research on dynamic response of the seabed, and for research on the digital model, only corresponding attribute parameters are set in software, so that the seabed is kept not to be washed and deformed in the simulation process, and the physical model is difficult to achieve, and sand lines are inevitably generated on the surface of the seabed of the model along with wave load for a period of time in the physical model. For the research of soil liquefaction, firstly, it is clear that soil liquefaction (English: soil liquefaction) means that soil is caused by the action of external cyclic load, so that the water pressure in the soil is increased, the effective stress among soil framework particles is reduced to zero, the soil loses the shear stress intensity, and the soil takes on a liquid form. When in liquefaction, the sand and water are mixed into slurry-like liquid, so that the soil loses the supporting force, and the house is inclined, the stratum is sunken, and the underground pipeline is broken or floats upwards. However, the prior art such as CN 212905530U provides a real-time monitoring device for the liquefaction depth of seabed, which cannot effectively control the influence of deformation of the seabed, and thus fails to meet the requirements of standard experiments in the laboratory. That is, regardless of the study on dynamic response of the seabed or liquefaction of the soil, deformation of the seabed is not an effective variable for verifying pore pressure response and liquefaction of the soil, so that the influence of the deformation of the seabed is reduced as much as possible, and the problems caused by the deformation of the seabed cannot be completely ignored in the current experiment, so that the experimental data have deviation. Disclosure of Invention The invention provides a measuring system for laboratory bore pressure response and seabed liquefaction standard experiments and a using method thereof, which are suitable for the bore pressure response and seabed liquefaction standard experiments and can effectively avoid the influence of deformation of the seabed on experimental data in the experimental process. The technical scheme adopted for solving the technical problems is as follows: The measuring system for laboratory bore pressure response and seabed liquefaction standard experiments comprises a sand fixing structure for inhibiting model seabed deformation, wherein the sand fixing structure comprises a sand fixing net, a second sliding rail, a third sliding rail and a scroll, the sand fixing net is made of metal or plastic, and the pore size of the sand fixing net is equal to the grain size of sand on the model seabed; The four sides of the sand fixing net are defined as a first side bar, a second side bar, a third side bar and a fourth side bar respectively, the first side bar, the second side bar, the fourth side bar and the third side bar are arranged in sequence, the fourth side bar is connected with the scroll and is parallel to the central axis of the scroll, the second side bar and the third side bar are embedded in grooves of a second slide rail and a third slide rail respectively, and meanwhile the second side bar and the third side bar are in sliding connection with the corresponding slide rail and are arranged in parallel; The first side strips of the sand fixing net are pulled by the scroll positions, the second side strips and the third side strips slide relative to the second slide rail and the third slide rail until the formed sand fixing net can cover the model seabed, and the formed sand fixing net is fixed on the second slide rail or the third slide rail through the fixing clamps; the measuring system also comprises a pore pressure meter which is fixed on the formed sand fixing net and is used for measuring pore pressure response and liquefaction working conditions of the model seabed area c