Marine rock and soil parameter testing device and testing method

Abstract

The present invention discloses a marine geotechnical parameter testing device and a testing method, which belongs to the field of marine geotechnical testing technology. The marine geotechnical parameter testing device includes a counterweight assembly, a probe rod assembly, a testing assembly and a cone tip assembly. In the probe rod assembly, a first accommodating chamber and a second accommodating chamber arranged up and down are formed in the first rod body, a water hole connecting the outside with the first accommodating chamber is provided on the first rod body, an oil bag is provided in the first accommodating chamber, one end of the oil pipe is connected to the oil bag, an electric reversing valve, an oil pump and a flow meter are all located in the second accommodating chamber and connected to the oil pipe; in the testing assembly, a testing chamber is formed between the testing bag and the second rod body, there is oil in the testing chamber, one end of the oil pipe away from the oil bag is connected to the testing chamber, and a second pressure sensor is provided on the second rod body and is used to detect the pressure of the testing chamber. The marine geotechnical parameter testing method adopts the above-mentioned marine geotechnical parameter testing device to reduce the disturbance to the seabed soil.

Description

Technical Field

[0001] The present invention relates to the field of marine rock and soil testing technology, and in particular to a marine rock and soil parameter testing device and a testing method. Background Art

[0002] The purpose of geotechnical engineering testing is to measure the characteristic parameters of rock and soil to evaluate its mechanical properties. For example, the static penetration test calculates the undrained shear strength of the soil by measuring the cone tip resistance, the cross-plate shear test calculates the shear strength and sensitivity of the soil by measuring the maximum moment of resistance to loss, and the lateral pressure test evaluates the compression modulus of the rock and soil by measuring the deformation of the inner wall of the hole.

[0003] With the development of offshore engineering construction, most geotechnical engineering testing technologies have been applied to in-situ testing of marine geotechnical engineering. However, the existing lateral pressure testers are mainly pre-drilled, that is, vertical holes are drilled in advance and then the lateral pressure tester is placed for testing. Due to the different environments between the seabed and the onshore water bodies, the seabed soil has the characteristics of high looseness, high water content and low strength. The pre-drilled lateral pressure tester is very easy to disturb the original soil, resulting in problems such as hole collapse and shrinkage, which makes the existing lateral pressure tester unable to be used for testing the seabed soil. Summary of the invention

[0004] The purpose of the present invention is to provide a marine rock and soil parameter testing device and a testing method to adapt to the seabed water environment and reduce the disturbance to the seabed soil.

[0005] As conceived above, the technical solution adopted by the present invention is: a marine geotechnical parameter testing device, including: a counterweight assembly; a probe rod assembly, which is arranged at the bottom end of the counterweight assembly, the probe rod assembly includes a first pressure sensor, a first rod body, an oil bladder, an oil pipe, an electric reversing valve, an oil pump and a flow meter, the top end of the first rod body is connected to the counterweight assembly, a first accommodating chamber and a second accommodating chamber arranged up and down are formed in the first rod body, a water hole connecting the outside and the first accommodating chamber is provided on the first rod body, the oil bladder is arranged in the first accommodating chamber, the first pressure sensor is arranged on the first rod body and is used to detect seawater pressure, there is oil in the oil bladder, one end of the oil pipe is connected to the oil bladder, and the other end of the oil pipe extends downward through the second accommodating chamber and passes through the first rod body, the electric reversing valve, the oil pump and the flow meter are all located in the second accommodating chamber and connected to the oil pipe; a testing assembly, the testing assembly includes a second pressure sensor, a second rod body and a testing bag sleeved on the outside of the second rod body, a testing chamber is formed between the testing bag and the second rod body, there is oil in the testing chamber, the top end of the second rod body is connected to the first rod body, an avoidance chamber is formed inside the second rod body, an end of the oil pipe away from the oil bag extends into the avoidance chamber and laterally passes through the second rod body to communicate with the testing chamber, the second pressure sensor is arranged on the second rod body and is used to detect the pressure of the testing chamber; a cone tip assembly includes a cone tip body, and the cone tip body is connected to the bottom end of the second rod body.

[0006] Preferably, the probe rod assembly further includes a first joint and a second joint, wherein the first joint is disposed at the top end of the first rod body and connected to the counterweight assembly, and the second joint is disposed at the bottom end of the first rod body and connected to the second rod body.

[0007] Preferably, the top end of the test capsule is clamped between the second joint and the second rod body, and the bottom end of the test capsule is clamped between the second rod body and the cone tip body.

[0008] Preferably, a partition is provided inside the first rod body, and the first accommodating cavity and the second accommodating cavity are distributed on upper and lower sides of the partition.

[0009] Preferably, the first rod body further includes a positioning column, one end of which is fixed to the partition, the oil bag is penetrated by the positioning column, and the other end of the positioning column is connected to the first joint.

[0010] Preferably, the top end of the oil sac is sealed and connected to the first joint, and the bottom end of the oil sac is sealed and connected to the partition.

[0011] Preferably, the oil pipe includes a main pipeline and an auxiliary pipeline, the electric reversing valve, the oil pump and the flow meter are arranged on the main pipeline in sequence from top to bottom, one end of the auxiliary pipeline is connected to the electric reversing valve, and the other end of the auxiliary pipeline is connected to the main pipeline at the lower side of the flow meter.

[0012] Preferably, the counterweight assembly includes a third rod body and a plurality of counterweight blocks, the bottom end of the third rod body is connected to the probe rod assembly, the top end of the third rod body is provided with a support portion, and the plurality of counterweight blocks are sleeved on the support portion.

[0013] Preferably, a lifting ring is provided on the top of the counterweight assembly, and the lifting ring is connected to the counterweight block located at the top.

[0014] A method for testing marine geotechnical parameters, using the marine geotechnical parameter testing device as described above, comprises: step 1: the marine geotechnical parameter testing device is in an initial state, the oil pump is in a closed state, and the electric reversing valve controls the oil pipe to be in a closed state; the marine geotechnical parameter testing device is transported to a set position by an operating vessel, the direction of the electric reversing valve is operated, and the oil pipe is controlled to connect the oil bag and the test chamber, so that the oil can flow freely between the oil bag and the test chamber; step 2: the marine geotechnical parameter testing device is released by a winch configured on the operating vessel, and the marine geotechnical parameter testing device is in a falling state; when the marine geotechnical parameter testing device falls in seawater, seawater enters the first accommodation chamber of the first rod body from the water hole, and the seawater applies a first pressure to the oil bag. At the same time, the test bag is subjected to the second pressure exerted by the external seawater. Since the oil bag is connected to the test chamber, the first pressure and the second pressure cancel each other out. Step 3: Determine whether the marine geotechnical parameter test device is stationary by the pressure value detected by the first pressure sensor. If the marine geotechnical parameter test device is stationary, operate the direction of the electric reversing valve to control the connection between the oil pipe and the oil pump, and start the oil pump to extract oil from the oil bag to the test chamber. As the oil is extracted, the volume of the test bag gradually expands and squeezes the surrounding soil. The force of the soil on the test bag is transmitted to the second pressure sensor through the oil. The pressure value P is monitored by the second pressure sensor, and the amount of oil extracted by the oil pump, that is, the increase in the volume of the oil in the test bag V, is monitored by the flow meter, and the lateral pressure modulus is calculated according to the formula.

[0015] Beneficial effects of the present invention: The marine geotechnical parameter testing device proposed in the present invention uses the device's own weight to fall in the seawater and uses the falling speed and the cone tip to penetrate into the seabed soil, thereby minimizing the disturbance to the original state of the seabed sediments to adapt to the relatively soft characteristics of the seabed soil. No drilling is required and no hole collapse will occur, thereby ensuring the accuracy of the test results. Since the oil bladder is connected to the test cavity during the falling process in the seawater, the oil can flow freely between the oil bladder and the test cavity to achieve pressure offset, thereby ensuring that the oil pump of the device can work normally during deep-sea testing. After the device is stationary, the oil pump draws oil from the oil bladder to the test cavity, so that the volume of the test bladder gradually expands and squeezes the surrounding soil. The force of the soil on the test bladder is transmitted to the second pressure sensor through the oil, thereby truly measuring the mechanical characteristic parameters of the seabed sediments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a marine geotechnical parameter testing device provided in an embodiment of the present invention.

[0017] Figure 2 The top view of the marine geotechnical parameter testing device provided by the embodiment of the present invention is Figure 1 .

[0018] Figure 3 yes Figure 2 AA section view.

[0019] Figure 4 yes Figure 3 Schematic diagram of part of the structure.

[0020] Figure 5 The top view of the marine geotechnical parameter testing device provided by the embodiment of the present invention is Figure 2 .

[0021] Figure 6 yes Figure 5 BB section view.

[0022] Figure 7 yes Figure 6 Schematic diagram of part of the structure.

[0023] Figure 8 It is a partial structural cross-sectional view of a marine geotechnical parameter testing device provided in an embodiment of the present invention.

[0024] Fig. 9 It is a structural schematic diagram of a first rod body provided by an embodiment of the present invention.

[0025] Fig.10 It is a partial structural schematic diagram of a marine geotechnical parameter testing device provided in an embodiment of the present invention.

[0026] In the figure: 10, counterweight assembly; 11, third rod body; 12, counterweight block; 20, probe rod assembly; 21, first rod body; 211, first accommodating chamber; 212, second accommodating chamber; 213, water hole; 214, positioning column; 22, oil bag; 23, oil pipe; 231, main pipeline; 232, auxiliary pipeline; 24, electric reversing valve; 25, oil pump; 26, flow meter; 27, first joint; 28, second joint; 30, test assembly; 31, second pressure sensor; 32, second rod body; 321, avoidance chamber; 33, test bag; 331, test chamber; 51, cone tip body; 60, lifting ring; 70, cable; 71, second signal transmission line. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] See also Figures 1 to 10 The embodiment of the present invention provides a marine rock and soil parameter testing device for performing parameter testing on seabed sediments, mainly performing lateral pressure testing on seabed soil.

[0032] The marine geotechnical parameter testing device comprises a counterweight assembly 10, a probe assembly 20, a test assembly 30 and a cone tip assembly. The counterweight assembly 10, the probe assembly 20, the test assembly 30 and the cone tip assembly are connected in sequence from top to bottom.

[0033] The probe rod assembly 20 is arranged at the bottom end of the counterweight assembly 10. The probe rod assembly 20 includes a first pressure sensor, a first rod body 21, an oil bladder 22, an oil pipe 23, an electric reversing valve 24, an oil pump 25 and a flow meter 26. The top end of the first rod body 21 is connected to the counterweight assembly 10. A first accommodating chamber 211 and a second accommodating chamber 212 arranged up and down are formed in the first rod body 21. A water hole 213 connecting the outside and the first accommodating chamber 211 is provided on the first rod body 21. The oil bladder 22 is arranged in the first accommodating chamber 211. The first pressure sensor is arranged on the first rod body 21 and is used to detect the seawater pressure. There is oil in the oil bladder 22. One end of the oil pipe 23 is connected to the oil bladder 22. The other end of the oil pipe 23 extends downward through the second accommodating chamber 212 and passes through the first rod body 21. The electric reversing valve 24, the oil pump 25 and the flow meter 26 are all located in the second accommodating chamber 212 and connected to the oil pipe 23.

[0034] The test assembly 30 includes a second pressure sensor 31, a second rod body 32, and a test capsule 33 sleeved on the outside of the second rod body 32. A test cavity 331 is formed between the test capsule 33 and the second rod body 32. There is oil in the test cavity 331. The top end of the second rod body 32 is connected to the first rod body 21. An avoidance cavity 321 is formed inside the second rod body 32. One end of the oil pipe 23 away from the oil capsule 22 extends into the avoidance cavity 321 and passes through the second rod body 32 horizontally to communicate with the test cavity 331. The second pressure sensor 31 is arranged on the second rod body 32 and is used to detect the pressure of the test cavity 331. Specifically, a mounting hole connecting the test cavity 331 and the avoidance cavity 321 is opened on the second rod body 32. The second pressure sensor 31 is arranged in the mounting hole and is sealed and connected to the mounting hole.

[0035] The cone tip assembly includes a cone tip body 51 , and the cone tip body 51 is connected to the bottom end of the second rod body 32 .

[0036] When in use, in the initial state, the oil pump 25 is in a closed state, and the electric reversing valve 24 controls the oil pipe 23 to be in a closed state; the marine geotechnical parameter testing device is transported to the set position by the operating ship, and the direction of the electric reversing valve 24 is operated to control the oil pipe 23 to connect the oil bag 22 and the test chamber 331, so that the oil can flow freely between the oil bag 22 and the test chamber 331.

[0037] The marine geotechnical parameter testing device is released by a winch configured on the operating vessel, and the marine geotechnical parameter testing device is in a falling state; when the marine geotechnical parameter testing device falls in the seawater, seawater enters the first accommodating chamber 211 of the first rod body 21 from the water through hole 213, and the seawater applies a first pressure to the oil bag 22. At the same time, the test bag 33 is subjected to a second pressure applied by the external seawater. Since the oil bag 22 is connected to the test chamber 331, the first pressure and the second pressure offset each other.

[0038] Whether the marine geotechnical parameter testing device is stationary is judged by the pressure value detected by the first pressure sensor. If the marine geotechnical parameter testing device is stationary, the direction of the electric reversing valve 24 is operated to control the connection between the oil pipe 23 and the oil pump 25, and the oil pump 25 is turned on to extract oil from the oil bag 22 to the test chamber 331. As the oil is extracted, the volume of the test bag 33 gradually expands and squeezes the surrounding soil. The force of the soil on the test bag 33 is transmitted to the second pressure sensor 31 through the oil. The pressure value P is monitored by the second pressure sensor 31, and the amount of oil extracted by the oil pump 25, that is, the increase in the volume V of the oil in the test bag 33, is monitored by the flowmeter 26, and the lateral pressure modulus is calculated according to the formula.

[0039] The device falls in the seawater by its own weight and penetrates into the seabed soil with the help of the falling speed and the cone tip, thereby minimizing the disturbance to the original state of the seabed sediments to adapt to the relatively soft characteristics of the seabed soil. No drilling is required and no hole collapse will occur, thereby ensuring the accuracy of the test results. Since the oil bladder 22 is connected to the test cavity 331 during the falling process in the seawater, the oil can flow freely between the oil bladder 22 and the test cavity 331 to achieve pressure offset, thereby ensuring that the oil pump 25 can work normally during the deep-sea test of the device. After the device is stationary, the oil pump 25 draws oil from the oil bladder 22 to the test cavity 331, so that the volume of the test bladder 33 gradually expands and squeezes the surrounding soil. The force of the soil on the test bladder 33 is transmitted to the second pressure sensor 31 through the oil, so that the mechanical characteristic parameters of the seabed sediments can be truly measured.

[0040] A lifting ring 60 is provided on the top of the counterweight assembly 10, and the lifting ring 60 is connected to the counterweight block 12 at the top. Specifically, it can be bolted. The cable of the winch on the operating vessel is connected to the lifting ring 60.

[0041] The marine geotechnical parameter testing device also includes a cable 70, which includes an electric wire and a signal transmission line. One end of the cable 70 is connected to the operating vessel, and the other end is connected to the marine geotechnical parameter testing device, which can be specifically connected to the electric reversing valve 24, the oil pump 25, the flow meter 26, the first pressure sensor, the second pressure sensor 31, etc. The counterweight assembly 10 is provided with a threading hole inside for threading the cable 70. The cable 70 is a conventional setting, and its structure and principle are not described in detail here. The flow meter 26 is a conventional device, and its structure and principle are not described in detail here. According to the flow meter 26, the volume of oil flowing from the oil bag 22 to the test bag 33 can be judged.

[0042] Among them, the cable 70 includes a second signal transmission line 71 connected to the second pressure sensor 31, one end of the second signal transmission line 71 is located in the avoidance cavity 321 and is connected to the second pressure sensor 31, and the other end of the second signal transmission line 71 passes through the second accommodating cavity 212 and the first accommodating cavity 211 and extends to the threading hole of the counterweight assembly 10.

[0043] The probe assembly 20 further includes a first joint 27 and a second joint 28. The first joint 27 is disposed at the top end of the first rod body 21 and is connected to the counterweight assembly 10, and the second joint 28 is disposed at the bottom end of the first rod body 21 and is connected to the second rod body 32. The first joint 27 and the first rod body 21 and the second joint 28 and the first rod body 21 can be connected by threads. The first joint 27 and the counterweight assembly 10 and the second joint 28 and the second rod body 32 can be connected by threads.

[0044] The top end of the test capsule 33 is clamped between the second joint 28 and the second rod 32, and the bottom end of the test capsule 33 is clamped between the second rod 32 and the cone tip body 51. The second rod 32 and the cone tip body 51 can be connected by threads.

[0045] A partition is provided inside the first rod body 21, and the first accommodating chamber 211 and the second accommodating chamber 212 are distributed on the upper and lower sides of the partition. The first accommodating chamber 211 contains seawater, and the second accommodating chamber 212 contains the electric reversing valve 24, the oil pump 25 and the flow meter 26. Due to the setting of the partition, the seawater in the first accommodating chamber 211 will not enter the second accommodating chamber 212, thereby protecting the electric reversing valve 24, the oil pump 25 and the flow meter 26.

[0046] At least two water holes 213 are provided on the first rod body 21 to allow water to flow in quickly and evenly. In this embodiment, two water holes 213 are provided on the first rod body 21 , and the two water holes 213 are distributed on both sides of the axis of the first rod body 21 .

[0047] The top end of the oil bladder 22 is sealedly connected to the first joint 27, and the bottom end of the oil bladder 22 is sealedly connected to the partition. The oil bladder 22 is substantially cylindrical, and the seawater is located between the outer wall of the oil bladder 22 and the inner wall of the first accommodating chamber 211, and the pressure applied to the oil bladder 22 is uniform. Specifically, both upper and lower ends of the oil bladder 22 are provided with openings, and the openings of the oil bladder 22 are sealed by covering with gaskets and tightening the locking member. The locking member can be a bolt. In this embodiment, the locking member is a nut.

[0048] The first rod body 21 further includes a positioning column 214, one end of which is fixed to the partition, the oil bag 22 is passed through the positioning column 214, and the other end of the positioning column 214 is connected to the first joint 27. The positioning column 214 is provided to position the oil bag 22 and facilitate the installation of the nut. In addition, the cable 70 can pass through the interior of the positioning column 214 into the second accommodating chamber 212, so the positioning column 214 also protects the cable 70.

[0049] The oil pipe 23 includes a main pipeline 231 and an auxiliary pipeline 232. The electric reversing valve 24, the oil pump 25 and the flow meter 26 are arranged on the main pipeline 231 from top to bottom. One end of the auxiliary pipeline 232 is connected to the main pipeline 231 between the electric reversing valve 24 and the oil pump 25, and the other end of the auxiliary pipeline 232 is connected to the main pipeline 231 below the flow meter 26. The electric reversing valve 24 is an existing electric three-way reversing valve, and its structure and principle are not described in detail here. The reversing of the electric reversing valve 24 can be controlled by a controller on the ship.

[0050] The counterweight assembly 10 includes a third rod body 11 and a plurality of counterweight blocks 12. The bottom end of the third rod body 11 is connected to the probe assembly 20. The top end of the third rod body 11 is provided with a support portion, and the plurality of counterweight blocks 12 are sleeved on the support portion. The counterweight blocks 12 are usually made of iron blocks or lead blocks, and the material and quantity of the counterweights can be adjusted according to the test depth of the seabed soil.

[0051] The diameter of the third rod body 11 is equal to the diameter of the second rod body 32, so as to smoothly penetrate the soil. The third rod body 11 of different lengths can be replaced according to the test depth requirements.

[0052] In the marine geotechnical parameter testing device, the first rod body 21, the second rod body 32 and the third rod body 11 are basically cylindrical to reduce the seawater resistance encountered during penetration. The marine geotechnical parameter testing device has a central axis, and the counterweight assembly 10 is arranged so that the center of gravity of the entire device is located on the central axis to ensure that the device falls vertically. The marine geotechnical parameter testing device falls from top to bottom in the seawater and penetrates from top to bottom into the sediment on the seabed. When the test capsule 33 expands, the test capsule 33 applies radial pressure to the soil.

[0053] The embodiment of the present invention also provides a method for testing marine geotechnical parameters, which adopts the above-mentioned marine geotechnical parameter testing device, including: step 1: the marine geotechnical parameter testing device is in an initial state, the oil pump 25 is in a closed state, and the electric reversing valve 24 controls the oil pipe 23 to be in a closed state; the marine geotechnical parameter testing device is transported to a set position by an operating ship, and the direction of the electric reversing valve 24 is operated to control the oil pipe 23 to conduct the oil bag 22 and the test chamber 331, so that the oil can flow freely between the oil bag 22 and the test chamber 331; step 2: the marine geotechnical parameter testing device is released by a winch configured on the operating ship, and the marine geotechnical parameter testing device is in a falling state; when the marine geotechnical parameter testing device falls in the seawater, the seawater enters the first accommodating chamber 211 of the first rod body 21 from the water hole 213, and the seawater applies a first pressure to the oil bag 22 force, and at the same time, the test capsule 33 is subjected to the second pressure exerted by the external seawater. Since the oil capsule 22 is connected to the test chamber 331, the first pressure and the second pressure cancel each other out. Step 3: judge whether the marine geotechnical parameter testing device is stationary by the pressure value detected by the first pressure sensor. If the marine geotechnical parameter testing device is stationary, operate the direction of the electric reversing valve 24 to control the connection between the oil pipe 23 and the oil pump 25, and start the oil pump 25 to extract oil from the oil capsule 22 to the test chamber 331. As the oil is extracted, the volume of the test capsule 33 gradually expands and squeezes the surrounding soil. The force of the soil on the test capsule 33 is transmitted to the second pressure sensor 31 through the oil. The pressure value P is monitored by the second pressure sensor 31, and the amount of oil extracted by the oil pump 25, that is, the increase in the volume V of the oil in the test capsule 33, is monitored by the flowmeter 26, and the lateral pressure modulus is calculated according to the formula.

[0054] Draw a curve with pressure value P as ordinate and oil volume increase V as abscissa. Three parameters are determined by the curve. The three parameters are: initial pressure P 0 , Plastic pressure P f and critical plastic pressure P f The corresponding oil volume increase V f .

[0055] The specific determination method is as follows: The point where the test curve intersects the ordinate, that is, the starting point of the curve pressure value is the initial pressure P 0 , unit kPa. The pressure corresponding to the end point of the straight line segment of the test curve is the critical pressure P f , unit kPa. and critical plastic pressure P f The corresponding volume is the increase in oil volume V f , unit: cm 3 .

[0056] Calculate the lateral pressure modulus E m The formula is: E m =(P f -P 0)*k / V f , where k is the correction factor. Based on the above characteristic parameters of rock and soil, the lateral pressure modulus can be used to evaluate the foundation bearing and deformation parameters.

[0057] The marine geotechnical parameter testing device not only solves the problem of limited test depth caused by traditional onshore piezometers relying on air pressure testing, but also differs from the existing pre-drilled piezometers used to test seabed sediments. By quickly penetrating the probe assembly 20 with a cone tip assembly into the sediment, the disturbance to the original state of the sediment is minimized, and the hole collapse phenomenon that affects the test results during the drilling process is avoided, so that the mechanical property parameters of shallow seabed sediments can be truly tested.

[0058] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A marine geotechnical parameter testing device, characterized in that: include: A counterweight assembly (10); A probe rod assembly (20) is arranged at the bottom end of the counterweight assembly (10), the probe rod assembly (20) comprising a first pressure sensor, a first rod body (21), an oil bag (22), an oil pipe (23), an electric reversing valve (24), an oil pump (25) and a flow meter (26), the top end of the first rod body (21) is connected to the counterweight assembly (10), a first accommodating chamber (211) and a second accommodating chamber (212) arranged up and down are formed in the first rod body (21), and a water hole (212) for connecting the outside with the first accommodating chamber (211) is provided on the first rod body (21). 3), the oil bag (22) is arranged in the first accommodating chamber (211), the first pressure sensor is arranged on the first rod body (21) and is used to detect the seawater pressure, the oil bag (22) contains oil, one end of the oil pipe (23) is connected to the oil bag (22), the other end of the oil pipe (23) extends downward through the second accommodating chamber (212) and passes through the first rod body (21), the electric reversing valve (24), the oil pump (25) and the flow meter (26) are all located in the second accommodating chamber (212) and connected to the oil pipe (23); A test assembly (30), the test assembly (30) comprising a second pressure sensor (31), a second rod (32) and a test capsule (33) sleeved on the outside of the second rod (32); a test chamber (331) is formed between the test capsule (33) and the second rod (32); oil is contained in the test chamber (331); the top end of the second rod (32) is connected to the first rod (21); a avoidance chamber (321) is formed inside the second rod (32); an end of the oil pipe (23) away from the oil capsule (22) extends into the avoidance chamber (321) and laterally passes through the second rod (32) to communicate with the test chamber (331); the second pressure sensor (31) is disposed on the second rod (32) and is used to detect the pressure of the test chamber (331); The cone tip assembly comprises a cone tip body (51), wherein the cone tip body (51) is connected to the bottom end of the second rod body (32).

2. The marine geotechnical parameter testing device according to claim 1, characterized in that: The probe rod assembly (20) further comprises a first joint (27) and a second joint (28), wherein the first joint (27) is arranged at the top end of the first rod body (21) and is connected to the counterweight assembly (10), and the second joint (28) is arranged at the bottom end of the first rod body (21) and is connected to the second rod body (32).

3. The marine geotechnical parameter testing device according to claim 2, characterized in that: The top end of the test capsule (33) is clamped between the second joint (28) and the second rod (32), and the bottom end of the test capsule (33) is clamped between the second rod (32) and the cone tip body (51).

4. The marine geotechnical parameter testing device according to claim 2, characterized in that: A partition is provided inside the first rod body (21), and the first accommodating cavity (211) and the second accommodating cavity (212) are distributed on upper and lower sides of the partition.

5. The marine geotechnical parameter testing device according to claim 4, characterized in that: The first rod body (21) further comprises a positioning column (214), one end of which is fixed to the partition plate, the oil bag (22) is passed through the positioning column (214), and the other end of which is connected to the first joint (27).

6. The marine geotechnical parameter testing device according to claim 4, characterized in that: The top end of the oil bag (22) is sealedly connected to the first joint (27), and the bottom end of the oil bag (22) is sealedly connected to the partition.

7. The marine geotechnical parameter testing device according to claim 1, characterized in that: The oil pipe (23) comprises a main pipeline (231) and an auxiliary pipeline (232); the electric reversing valve (24), the oil pump (25) and the flow meter (26) are arranged on the main pipeline (231) in sequence from top to bottom; one end of the auxiliary pipeline (232) is connected to the electric reversing valve (24), and the other end of the auxiliary pipeline (232) is connected to the main pipeline (231) at the lower side of the flow meter (26).

8. The marine geotechnical parameter testing device according to claim 1, characterized in that: The counterweight assembly (10) comprises a third rod body (11) and a plurality of counterweight blocks (12); the bottom end of the third rod body (11) is connected to the probe rod assembly (20); the top end of the third rod body (11) is provided with a support portion, and the plurality of counterweight blocks (12) are sleeved on the support portion.

9. The marine geotechnical parameter testing device according to claim 8, characterized in that: A lifting ring (60) is provided on the top of the counterweight assembly (10), and the lifting ring (60) is connected to the counterweight block (12) located at the top.

10. A method for testing marine rock and soil parameters, characterized in that: The marine geotechnical parameter testing device according to any one of claims 1 to 9 comprises: Step 1: The marine geotechnical parameter testing device is in an initial state, the oil pump (25) is in a closed state, and the electric reversing valve (24) controls the oil pipe (23) to be in a closed state; The marine geotechnical parameter testing device is transported to a set position by an operating vessel, and the direction of the electric reversing valve (24) is operated to control the oil pipe (23) to connect the oil bag (22) and the testing chamber (331), so that the oil can flow freely between the oil bag (22) and the testing chamber (331); Step 2: The marine geotechnical parameter testing device is released by a winch configured on the operating vessel, and the marine geotechnical parameter testing device is in a falling state; When the marine geotechnical parameter testing device falls in the seawater, the seawater enters the first accommodating chamber (211) of the first rod body (21) through the water hole (213), and the seawater applies a first pressure to the oil bag (22). At the same time, the testing bag (33) is subjected to a second pressure applied by the external seawater. Since the oil bag (22) is connected to the testing chamber (331), the first pressure and the second pressure cancel each other out. Step 3: judging whether the marine geotechnical parameter testing device is stationary by the pressure value detected by the first pressure sensor; if the marine geotechnical parameter testing device is stationary, operating the direction of the electric reversing valve (24) to control the connection between the oil pipe (23) and the oil pump (25); starting the oil pump (25) to extract oil from the oil bag (22) to the test chamber (331); as the oil is extracted, the volume of the test bag (33) gradually expands and squeezes the surrounding soil, and the force of the soil on the test bag (33) is transmitted to the second pressure sensor (31) through the oil; The pressure value P is monitored by the second pressure sensor (31), the amount of oil extracted by the oil pump (25), i.e. the increase in the volume V of the oil in the test bag (33), is monitored by the flow meter (26), and the lateral pressure modulus is calculated according to the formula.

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