Visual spherical penetrometer and system for measuring in-situ strength parameters of ocean soil

Abstract

The utility model provides a visual spherical penetrometer and a visual spherical penetrometer system for measuring in-situ strength parameters of ocean soil. An upper hemisphere and a lower hemisphere are detachably and fixedly connected; a hole is formed in the top of the upper hemisphere, the end part of the high-definition micro camera is fixed at the hole in the top, and the high-definition micro camera is vertically arranged upwards to capture the flow direction of a soil body of the spherical penetrometer and to capture whether the soil body is in contact with the connecting rod or not; a certain gap is reserved between the bottom of the friction sleeve and the upper hemisphere, the gap is wrapped by a flexible soft film, the bottom of the force sensor is connected with the upper hemisphere, the top of the force sensor is connected with a dowel bar, and the dowel bar is located in the friction sleeve; a waterproof high-definition camera is installed in the spherical penetrometer to capture the flowing condition of the soil body in the penetration process, the critical depth strongly related to the evaluation method is accurately obtained, reduction of the engineering amount and the engineering cost are facilitated, and the spherical penetrometer has high engineering implementability.

Description

Technical Field

[0001] The utility model relates to the technical field of marine clay strength characteristic measurement, in particular to a visual spherical penetrometer and a system for measuring in-situ strength parameters of marine soil. Background Art

[0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art.

[0003] Accurate measurement of marine clay strength properties plays a key role in the design of offshore wind power. In-situ testing is a key means to evaluate the engineering properties of marine soil. At present, cone penetration test (CPT) and field cross plate shear test (VST) are two commonly used test methods. CPT can provide continuous soil strength data, but its results need to be corrected according to excess pore water pressure and overburden stress. In addition, the relationship between penetration resistance and soil strength in CPT results depends on the empirical bearing capacity coefficient, which is selected based on experience and has a large range of values ​​and is uncertain. In the absence of detailed site condition data, inaccurate empirical bearing capacity coefficients will affect the accuracy of test results. Although VST can provide direct measurement of soil strength at a specific depth, its data is discrete and cannot form a continuous strength profile. The full-flow ball penetrometer (FFBP) has been favored by geotechnical engineers in recent years due to its larger projection area, clear and definite surrounding soil flow mechanism, less dependence on stiffness index, etc., and rapid measurement of original soil strength parameters.

[0004] During the penetration of the spherical penetrometer, after the upper soil of the spherical penetrometer is completely closed (i.e., the surrounding soil forms a complete reflow mechanism), the strength parameters of the deep soil can be obtained based on analytical solutions or numerical methods, which are relatively mature at present; before the upper soil of the spherical penetrometer is completely closed, the surrounding soil has not yet formed a complete reflow mechanism, and the flow mechanism at this stage is still unclear. Moreover, when the upper soil is completely closed during the penetration process (this depth becomes the critical depth) can only be inferred by finite element methods, and the in-situ strength parameters of the soil are evaluated based on the inferred critical depth, which will affect the accuracy of the in-situ strength parameters of the soil; accurate critical depth and reflow mechanism are crucial for evaluating the in-situ strength parameters of the soil. However, the critical depth and the flow mechanism of the soil around the penetrometer inferred by using finite element methods cannot be verified, which may affect the evaluated in-situ strength parameters of the soil. Utility Model Content

[0005] In order to address the deficiencies in the prior art, the utility model provides a visual spherical penetrometer and system for measuring the in-situ strength parameters of marine soil. A waterproof high-definition camera is installed in the spherical penetrometer to capture the soil flow during the penetration process, and accurately obtain the critical depth that is strongly correlated with the evaluation method, so as to more accurately measure and evaluate the in-situ strength parameters of the soil. The accurately obtained soil parameters can make the pile foundation design of offshore wind power projects more accurate, help reduce the amount of engineering work, reduce engineering costs, and have strong engineering feasibility.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a visual spherical penetrometer for measuring in-situ strength parameters of marine soil.

[0008] A visual spherical penetrometer for measuring in-situ strength parameters of marine soil, comprising: a lower hemisphere, an upper hemisphere, a high-definition micro camera, a force sensor, a friction sleeve and a force transmission rod, wherein the upper hemisphere and the lower hemisphere are detachably fixedly connected;

[0009] The top of the upper hemisphere is opened, and the end of a high-definition micro camera is fixed at the top opening. The high-definition micro camera is arranged vertically upward to capture the soil flow direction of the spherical penetrometer and whether the soil is in contact with the connecting rod;

[0010] A certain gap is left between the bottom of the friction sleeve and the upper hemisphere, and the gap is covered with a flexible soft film. The bottom of the force sensor is connected to the upper hemisphere, and the top of the force sensor is connected to the force transmission rod, which is located in the friction sleeve.

[0011] As a further limitation of the first aspect of the utility model, the transmission line of the high-definition micro camera passes through the friction sleeve and is connected to the external control terminal; or, the high-definition micro camera is a wireless micro camera, and the wireless micro camera is wirelessly connected to the external control terminal; the transmission line of the force sensor passes through the friction sleeve and is connected to the external control terminal; or, the force sensor is a wireless force sensor, and the wireless force sensor is wirelessly connected to the external control terminal.

[0012] As a further limitation of the first aspect of the utility model, the lower hemisphere and the upper hemisphere are threadedly connected to form a spherical shape.

[0013] As a further limitation of the first aspect of the utility model, the end of the high-definition micro camera is fixed to the top opening by means of threads.

[0014] As a further limitation of the first aspect of the present utility model, the bottom of the force sensor is connected to the upper hemisphere via threads.

[0015] As a further limitation of the first aspect of the present utility model, the top of the force sensor is connected to the force transmission rod through a thread.

[0016] As a further limitation of the first aspect of the present utility model, there are two high-definition miniature cameras arranged axially symmetrically; or, there are four high-definition miniature cameras arranged axially symmetrically.

[0017] In a second aspect, the utility model provides a visualization system for measuring in-situ strength parameters of marine soil.

[0018] A visualization system for measuring in-situ strength parameters of marine soil, comprising: an external control terminal and the visualization spherical penetrometer for measuring in-situ strength parameters of marine soil described in the first aspect of the utility model;

[0019] The force sensor and the high-definition micro camera are both connected to the external control terminal for communication, and the external control has the functions of displaying video and force sensing parameters.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. The utility model installs a waterproof high-definition camera in the spherical penetrometer to capture the soil flow during the penetration process, accurately obtain the critical depth that is strongly related to the evaluation method, and thereby more accurately measure and evaluate the in-situ strength parameters of the soil. The accurately obtained soil parameters can make the pile foundation design of offshore wind power projects more accurate, help reduce the amount of engineering, reduce engineering costs, and have strong engineering feasibility.

[0022] 2. The images captured by the high-definition micro camera in the utility model can further fully understand the flow mechanism of soil, fill the current deficiencies in the research on the flow mechanism of soil, and the images can also provide a reference for numerical methods, verify the effectiveness of numerical models, and contribute to the further development of numerical methods, which has important scientific research value.

[0023] 3. The visualized spherical penetrometer proposed in the utility model has the advantages of easy installation, simple operation, easy to carry, strong flexibility and high accuracy. It can be used for in-situ tests on site or for in-situ soil samples in the laboratory, so as to quickly and accurately obtain the marine soil strength parameters required in marine engineering design, improve the efficiency of geological surveys, reduce the cost of geological surveys, shorten the design cycle and reduce engineering costs.

[0024] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0026] Figure 1 A schematic diagram of a visual spherical penetrometer provided in Example 1 of the utility model;

[0027] Figure 2 A partial connection diagram of a visual spherical penetrometer provided in Example 1 of the utility model;

[0028] Among them, 1. lower hemisphere; 2. upper hemisphere; 3. high-definition micro camera; 4. thread; 5. force sensor; 6. camera connecting line; 7. friction sleeve; 8. force transmission rod; 9. thread; 10. thread; 11. gap; 12. flexible soft film; 13. thread. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] In the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] Embodiment 1:

[0033] In this implementation, if Figure 1 and Figure 2 As shown, a visual spherical penetrometer for measuring in-situ strength parameters of marine soil is proposed, including: a lower hemisphere 1, an upper hemisphere 2, a high-definition micro camera 3, a force sensor 5, a friction sleeve 7 and a force transmission rod 8. The upper hemisphere and the lower hemisphere are connected by a thread 4 to form a sphere.

[0034] In this implementation, a hole is opened at the top of the upper hemisphere 1, and the end of the high-definition micro camera 3 is fixed to the top hole of the upper hemisphere 1 by a thread 13. The high-definition micro camera 3 is vertically upward to capture the soil flow direction of the spherical penetrometer and whether the soil is in contact with the connecting rod. The camera connecting line 6 is connected to the computer (i.e., the external control terminal) through the friction sleeve 7. A wireless high-definition micro camera can also be used to wirelessly connect to the computer (i.e., the external control terminal).

[0035] In this implementation, the bottom of the force sensor 5 is connected to the upper hemisphere 2 through a thread 9, and the top of the force sensor 5 is connected to the force transmission rod 8 through a thread 10. The force sensor 5 transmits the electrical signal to the computer (i.e., an external control terminal). A certain gap 11 is left between the bottom of the friction sleeve 7 and the upper hemisphere 2. The friction sleeve 7 is not directly connected to the two. The purpose is to make the force sensor 5 only measure the penetration resistance of the ball part but not the side wall friction of the connecting rod part. The gap 11 is wrapped with a flexible soft film 12 to prevent soil from entering the gap 11 and affecting the measurement data. Two high-definition micro cameras can be arranged symmetrically, or four can be arranged axially symmetrically.

[0036] The process of capturing images by a high-definition micro camera during the penetration of the spherical penetrometer is as follows: (a) At the beginning of penetration, the upper soil is not completely backflowed; (b) As the penetration depth increases, the upper soil contacts the friction sleeve to form a closed cavity; (c) As the penetration depth increases, the upper cavity of the sphere gradually decreases; (d) After penetrating to a certain depth, the upper cavity disappears, forming a complete backflow mechanism, and this depth is the critical depth; before step (d), the in-situ strength parameters of marine soil can be evaluated based on numerical methods or empirical methods, and after step (d), the in-situ strength parameters of marine soil can be accurately evaluated based on analytical methods or numerical methods. The images captured by the high-definition camera can also provide a reference for the numerical method and verify the numerical model.

[0037] Embodiment 2:

[0038] Embodiment 2 of the present utility model provides a visualization system for measuring in-situ strength parameters of marine soil, comprising: an external control terminal and the visualization spherical penetrometer for measuring in-situ strength parameters of marine soil described in Embodiment 1 of the present utility model;

[0039] The force sensor and the high-definition micro camera are both connected to the external control terminal for communication, and the external control has the functions of displaying video and force sensing parameters.

[0040] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A visual spherical penetrometer for measuring in-situ strength parameters of marine soil. It is characterized in that It includes: a lower hemisphere, an upper hemisphere, a high-definition micro camera, a force sensor, a friction sleeve and a force transmission rod, and a detachable fixed connection between the upper hemisphere and the lower hemisphere; The top of the upper hemisphere is opened, and the end of a high-definition micro camera is fixed at the top opening. The high-definition micro camera is arranged vertically upward to capture the soil flow direction of the spherical penetrometer and whether the soil is in contact with the connecting rod; A certain gap is left between the bottom of the friction sleeve and the upper hemisphere, and the gap is covered with a flexible soft film. The bottom of the force sensor is connected to the upper hemisphere, and the top of the force sensor is connected to the force transmission rod, which is located in the friction sleeve.

2. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to claim 1, characterized in that: The transmission line of the high-definition micro camera passes through the friction sleeve and is connected to the external control terminal, and the transmission line of the force sensor passes through the friction sleeve and is connected to the external control terminal.

3. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to claim 1, characterized in that: The lower hemisphere and the upper hemisphere are threadedly connected to form a spherical shape.

4. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to claim 1, characterized in that: The high-definition micro camera is a wireless micro camera, which is connected to an external control terminal via wireless communication.

5. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to claim 1, characterized in that: The force sensor is a wireless force sensor, which is wirelessly connected to an external control terminal.

6. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to claim 1, characterized in that: The end of the high-definition micro camera is fixed to the top opening by means of threads.

7. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to any one of claims 1 to 6, characterized in that: The bottom of the force sensor is connected to the upper hemisphere via threads.

8. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to any one of claims 1 to 6, characterized in that: The top of the force sensor is connected to the force transmission rod through threads.

9. The visual spherical penetrometer for measuring in-situ strength parameters of marine soil according to any one of claims 1 to 6, characterized in that: There are two high-definition micro cameras arranged axially symmetrically; or, there are four high-definition micro cameras arranged axially symmetrically.

10. A visualization system for measuring in-situ strength parameters of marine soil, characterized in that: include: An external control terminal and a visual spherical penetrometer for measuring in-situ strength parameters of marine soil as described in any one of claims 1 to 9; The force sensor and the high-definition micro camera are both connected to the external control terminal for communication, and the external control has the functions of displaying video and force sensing parameters.

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