CN-122016450-A - In-situ test device for three-dimensional mechanical parameters of submarine sediment and working method of in-situ test device

CN122016450ACN 122016450 ACN122016450 ACN 122016450ACN-122016450-A

Abstract

The invention discloses a three-dimensional mechanical parameter in-situ test device for a submarine sediment and a working method thereof, and belongs to the technical field of ocean engineering geological investigation. The device comprises a penetrating main rod module, a movable probe rod module, a replaceable probe module, a multidimensional sensing module and a control and data acquisition module. The device realizes vertical penetration test through the penetration main rod, utilizes the movable probe rod to carry out horizontal loading and rotation disturbance test, supports layered circulation test of different depths, integrates various sensors such as pore water pressure and the like. The working method comprises the steps of device calibration, vertical penetration test, target depth horizontal loading, rotation disturbance effect test and layering circulation test, and can synchronously obtain multidimensional mechanical parameters such as non-drainage shear strength, p-y curve, pore water pressure and the like. The invention realizes multifunctional integrated in-situ test, improves data consistency and operation efficiency, and provides comprehensive and efficient technical support for ocean engineering geological exploration and foundation design.

Inventors

GUO XINGSEN
WANG ZIYU
LIANG DONGFANG
FENG YAOHUI
ZHANG CHENG
LAI YING
ZHANG WEI
LI LEI
LIU HU
WU TIANYU
NIAN TINGKAI

Assignees

中国海洋大学三亚海洋研究院
中国海洋大学
华南理工大学
浙江大学
广州海洋地质调查局三亚南海地质研究所
青岛罗博飞海洋技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260326

Claims (6)

1. The device for in-situ testing of three-dimensional mechanical parameters of the submarine sediment is characterized by comprising: The injection main rod module comprises an injection main rod (1) and a rotating shaft (2), a coupler (21) and a speed reducing motor (22) which are arranged in the injection main rod (1), wherein the injection main rod (1) is a rigid hollow rod, the rotating shaft (2) is arranged in the injection main rod (1), the rotating shaft (2) is axially arranged along the injection main rod and can rotate relative to the injection main rod (1), the top end of the rotating shaft (2) is connected with an output shaft of the speed reducing motor (22) through the coupler (21), a torque sensor (3) is arranged on the rotating shaft (2), a tilt measuring device (4) is arranged on the inner wall of the upper part of the injection main rod (1), the rotating shaft (2) is connected with the inner wall of the injection main rod (1) through a plurality of supporting frames (5), each supporting frame (5) comprises a bearing (5-1), the inner ring of the bearing (5-1) is fixedly sleeved on the rotating shaft (2), one end of the outer ring of the bearing (5-1) is fixedly connected with the outer wall of the outer ring of the bearing (5-1) at equal distance, and the other end of the supporting rod (5-2) is fixedly connected with the inner wall of the main rod (1). The movable probe rod module is arranged in the middle of the penetrating main rod (1), a cavity for accommodating the movable probe rod module is formed in the middle of the penetrating main rod (1), the movable probe rod module comprises an electric telescopic rod (6), a first high-precision miniature pressure sensor (7), a rigid cylinder test section (8), 2 connecting rods (9) and a rotary filling section (10), the tail end of the electric telescopic rod (6) is fixed on a rotating shaft (2), the tail end of the first high-precision miniature pressure sensor (7) is arranged at the output end of the electric telescopic rod (6), the rigid cylinder test section (8) is fixedly arranged at the front end of the first high-precision miniature pressure sensor (7), the rotary filling section (10) is a rigid hollow cylinder with one side provided with an opening for accommodating the electric telescopic rod (6), the first high-precision miniature pressure sensor (7) and the rigid cylinder test section (8), and the inner wall of the rotary filling section (10) is mutually connected with the rotating shaft (2) through the 2 connecting rods (9); The replaceable probe module comprises a replaceable probe (11), the replaceable probe (11) is connected with the lower end of a rigid short rod (13) penetrating into the bottom end of the main rod (1) through a quick-change interface (12), the upper end of the rigid short rod (13) is connected with a second high-precision miniature pressure sensor (14), two sides of the second high-precision miniature pressure sensor (14) are fixedly connected with the inner wall of the main rod (1) through a fixing rod (23), the outer wall of the replaceable probe (11) is in direct contact with soil, a pore water pressure sensor (15) is integrated in the replaceable probe, and a water inlet (16) is formed in the nose of the replaceable probe (11); the multidimensional sensing module comprises a inclinometer (4), a torque sensor (3), a first high-precision miniature pressure sensor (7), a second high-precision miniature pressure sensor (14) and a pore water pressure sensor (15); The control and data acquisition module comprises a data acquisition instrument (18) and a control driver (19), wherein the data acquisition instrument (18) is in communication connection with all sensors in the multi-dimensional sensing module, the data acquisition instrument (18) is in communication connection with the control driver (19), and the control driver (19) is in communication connection with the electric telescopic rod (6) and the gear motor (22).
2. The in-situ test device for three-dimensional mechanical parameters of the submarine sediment according to claim 1, wherein the penetrating main rod (1) is made of titanium alloy or duplex stainless steel, the surface of the penetrating main rod is coated with an anodized/ceramic coating and a PTFE anti-fouling layer, and the sliding surface is coated with a DLC or MoS 2 solid lubrication coating.
3. The device according to claim 1, wherein the replaceable probe (11) is one of a ball-type, cone-type or T-type probe.
4. The device for in-situ testing of three-dimensional mechanical parameters of submarine sediment according to claim 1, characterized in that a thrust washer (20) is arranged between the rotary filling section (10) and the penetrating main rod (1).
5. The device for in-situ testing of three-dimensional mechanical parameters of submarine sediment according to claim 4, wherein the thrust washer (20) is made of bronze graphite composite material or PTFE composite material.
6. A method of operating a device for in situ testing of three-dimensional mechanical parameters of a subsea sediment according to any of claims 1-5, comprising the steps of: S1, preparing and calibrating a device, namely selecting and installing a replaceable probe (11) according to the type of a soil layer to be tested, calibrating a inclinometer (4), a torque sensor (3), a first high-precision miniature pressure sensor (7), a second high-precision miniature pressure sensor (14) and a pore water pressure sensor (15), and arranging the device at a test point; s2, vertical penetration and profile test, namely controlling a carrying penetration platform and a penetration main rod (1) to press the device into a submarine sediment at a constant speed set in advance, and synchronously and continuously collecting penetration resistance measured by a second high-precision miniature pressure sensor (14), pore water pressure measured by a pore water pressure sensor (15) and data of a inclinometer (4) through a data acquisition instrument in the process to obtain non-drainage shear strength and pore water pressure profile; S3, performing horizontal loading test of target depth, namely stopping vertical movement after penetrating into the first target depth, starting an electric telescopic rod (6), horizontally extending the whole rigid cylindrical test section (8) to enable the rigid cylindrical test section to contact and squeeze soil, and then performing multistage displacement control loading to synchronously acquire horizontal resistance force received by the rigid cylindrical test section (8) and acquire p-y curve, non-drainage shear strength and pore pressure evolution data of the soil at the depth; S4, testing a rotation disturbance effect, namely after finishing a horizontal loading test, maintaining the horizontal position of a rigid cylinder test section (8), starting a gear motor (22), and driving the gear motor to rotate around the axis according to a rotating speed and a number of turns which are set in advance; s5, performing layered circulation testing, namely driving the penetrating main rod to continuously penetrate downwards to the next target depth, and repeating the steps S3 and S4, thereby realizing layered three-dimensional in-situ mechanical parameter testing of the submarine sediment along the depth direction.

Description

In-situ test device for three-dimensional mechanical parameters of submarine sediment and working method of in-situ test device Technical Field The invention relates to the technical field of ocean engineering geological investigation, in particular to a three-dimensional mechanical parameter in-situ test device for a submarine sediment and a working method thereof. Background At present, in the offshore wind power foundation, the ocean oil and gas development, the deep sea mining and various ocean engineering construction processes, the bearing, deformation and stability of the submarine sediment are directly related to the safety and service performance of engineering structures such as pile foundation/anchoring/pipeline laying and the like. Thus, the engineering investigation phase typically requires acquisition and evaluation of multiple mechanical properties of the subsea sediment to support parameter inversion, design calculation and construction control. In the existing marine sediment in-situ test means, the static Cone Penetration Test (CPT) technology is widely applied and is generally used for measuring indexes such as cone tip resistance, sidewall friction resistance, pore water pressure and the like in the penetrating process, so that sediment strength and state parameters are estimated. Meanwhile, in the device with a horizontal loading/displacement function (such as a related module for obtaining a p-y curve) which appears in recent years, the lateral reaction characteristic of a soil body can be represented by applying horizontal displacement or horizontal load, so that a basis is provided for designing an offshore pile foundation. In the field of marine soil mechanics testing, special devices for soft soil characteristics have also been proposed. For example, chinese patent CN 110824147B (application No. 201911297379.6, university of company, university) discloses a "full-flow ball-type penetration device and method for laboratory and shipboard", which is used for in-situ and shipboard testing of parameters such as non-drainage shear strength, pore water pressure, etc. of subsea soft soil by penetrating and integrating sensors such as pressure and pore water pressure through a ball-type probe. The technology improves the precision and applicability of the weak sediment test to a certain extent, and is particularly suitable for obtaining parameters of the marine soft soil with low strength, high water content and high sensitivity. However, the existing in-situ test equipment has certain limitations on the whole, namely, the test dimension is often single, the vertical penetration response or the single-direction loading response is usually focused, multiple working conditions such as the vertical, horizontal and disturbance effects are difficult to consider in the same system, the device is often required to be replaced, repeatedly arranged or resampled when the device is tested according to different parameters or different directions, the operation efficiency is low, the cost is high, the space difference between different test points can be possibly introduced, the space continuity characterization capability of the sediment with different depths is insufficient, and the multi-dimensional response synchronous acquisition along with the depth change is difficult to realize on a single device, so that the three-dimensional in-situ knowledge and the refined parameter modeling of the sediment 'vertical-horizontal-disturbance' coupling behavior are limited. Therefore, it is necessary to provide a technical solution capable of conducting multidimensional in-situ test on a submarine sediment, so as to improve test efficiency and data consistency and enhance comprehensive characterization capability of different depth and multidirectional mechanical response of the sediment. Disclosure of Invention In order to make up for the defects of the prior art, the invention provides a three-dimensional mechanical parameter in-situ test device for a submarine sediment and a working method thereof. The invention is realized by the following technical scheme that the in-situ test device for the three-dimensional mechanical parameters of the submarine sediment comprises: The device comprises a main penetrating rod module, a tilting detector, a supporting frame and a supporting frame, wherein the main penetrating rod module comprises a main penetrating rod, a rotating shaft, a coupler and a speed reducing motor, the rotating shaft, the coupler and the speed reducing motor are arranged in the main penetrating rod, the main penetrating rod is a rigid hollow rod, the rotating shaft is arranged in the main penetrating rod, the rotating shaft is axially arranged along the main penetrating rod and can rotate relative to the main penetrating rod, the top end of the rotating shaft is connected with an output shaft of the speed reducing motor through the coupler, a torque sensor is arranged on the rotating shaft; The m