A slurry supporting capacity testing device and testing method

Abstract

The present application provides a kind of mud supporting capacity testing device and test method, belong to engineering field, for solving mud bearing capacity uncertainty, high cost problem, the device includes model box, the model box side wall is sequentially opened with several strip openings from bottom to top, strip opening is slidably provided with baffle, the baffle is separated into several chambers from bottom to top by model box, load sensor is installed on the baffle on the bottom surface of model box;The model box is also provided with the push unit of pushing several baffle to slide in turn.The present application can carry out multiple tests under different soil conditions, different soil content, different mud ratio conditions, test the best ratio of mud to soil supporting effect, determine the corresponding mud bearing capacity of different soil layers, can greatly reduce the resistance when shield pipe jacking, reduce the setting of relay station, reduce the construction cycle and cost of pipe jacking, simple to use, test effect is intuitive.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of civil engineering, and particularly relates to a mud supporting capacity testing device and a testing method. BACKGROUND

[0002] Pipe jacking construction technology is a pipe burying construction technology without or with less excavation, which is a construction technology that, by means of the jacking force generated by jacking equipment in a working pit, overcomes the friction between the pipe and the surrounding soil, and jacks the pipe into the soil according to the designed slope. In pipe jacking engineering or shaft excavation engineering, lubricating mud is used as the main drag reduction material. The lubricating mud is usually made of high-quality bentonite, water and some additives.

[0003] The lubricating mud not only provides lubrication and excellent drag reduction effect in the pipe jacking process, but also provides support effect to the soil. However, when the mud is not pure mud, the drag reduction effect will decrease significantly with the increase of the soil content in the mud. When the soil content reaches a certain level, the drag reduction effect may be almost zero. Because the soil will fall and collapse into the reserved joint during construction, especially in sand layers with poor self-stability, the amount of soil falling will be more, which inevitably reduces the drag reduction effect of the mud on the pipe. Therefore, the mud needs to have a certain bearing capacity to ensure that the mud can maintain excellent drag reduction effect.

[0004] However, in the existing engineering practice, there is still a lack of relevant tests and calculation methods for the bearing performance test of the drag reduction mud, which mainly relies on engineering experience and more grouting, resulting in waste and making it difficult to achieve excellent drag reduction effect.

[0005] The present application provides a testing device capable of testing the bearing capacity of mud, reducing the construction period and cost of pipe jacking. SUMMARY

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a mud supporting capacity testing device and a testing method to solve the problem of uncertain mud bearing capacity in the prior art.

[0007] The present application provides a mud supporting capacity testing device, which comprises a model box, a plurality of strip-shaped openings are uniformly arranged on the side wall of the model box from bottom to top, a baffle is slidably arranged at each strip-shaped opening, the baffle divides the model box into a plurality of chambers from bottom to top, the baffle can slide in a direction away from the model box, and a load sensor is installed on the bottom surface of the model box and the baffle.

[0008] The model box is further provided with a pushing unit for pushing the baffles to slide in sequence.

[0009] As an optional solution, the pushing unit comprises a mounting frame, a storage plate, a storage groove, a baffle sliding block and a spring.

[0010] The mounting frame is located on one side of the strip-shaped opening and can slide away from the model box, a plurality of receiving plates are fixedly connected to the mounting frame from bottom to top, the receiving plates correspond to the partitions one by one, a receiving groove is formed in the side of each receiving plate facing the model box, one end of each partition extends into the receiving groove and is fixedly connected with a partition sliding block, the partition sliding block slides away from the model box, a spring is also installed in the receiving groove, one end of the spring is fixedly connected with the bottom of the receiving groove, and the other end is fixedly connected with the partition sliding block;

[0011] The pushing unit further comprises a power module for driving the movement of the mounting frame and a limiting module for limiting the movement of the partitions.

[0012] As an optional solution, the limiting module comprises two groups of limiting components, and the two groups of limiting components are arranged on the side wall of the model box and located on the left and right sides of the sliding direction of the mounting frame;

[0013] Each limiting component comprises a first sliding groove, a first sliding block, a threaded rod and a limiting notch.

[0014] The first sliding groove is formed in the side wall of the model box and has a sliding direction perpendicular to the ground, a plurality of first sliding blocks are slidably arranged in the first sliding groove, the first sliding blocks correspond to the partitions one by one, the length of the first sliding block located above in the sliding direction is greater than that of the first sliding block located below, a threaded rod is also rotatably installed in the first sliding groove, the axis of the threaded rod is parallel to the first sliding groove, and the first sliding blocks are sleeved on the threaded rod and threadedly connected with the threaded rod.

[0015] Limiting notches are formed in the side edges of the partitions facing the two groups of limiting components, and one end of the first sliding block is located in the limiting notch.

[0016] As an optional solution, the power module comprises a first sliding rail, a second sliding block and a first telescopic rod.

[0017] The first sliding rail is located on one side of the strip-shaped opening, and the length direction of the first sliding rail is perpendicular to the side wall of the model box, the second sliding block is slidably installed on the first sliding rail, and the mounting frame is fixedly connected to the top surface of the second sliding block.

[0018] A first telescopic rod is also installed on the side wall of the model box, the telescopic direction of the first telescopic rod is parallel to the sliding direction of the first sliding rail, and the telescopic end of the first telescopic rod is fixedly connected with the mounting frame.

[0019] As an optional solution, the pushing unit further comprises two groups of cleaning modules, and the two groups of cleaning modules are installed on the top surface of the receiving plate and located on the left and right sides of the sliding direction of the mounting frame.

[0020] Each cleaning module comprises a first rotating shaft, a connecting plate, a torsional spring and brush hairs.

[0021] The first rotating shaft is rotatably installed on the top surface of the receiving plate, the axis of the first rotating shaft is perpendicular to the top surface of the receiving plate, the top of the first rotating shaft is fixedly connected with a connecting plate, the other end of the connecting plate points to the model box, the first rotating shaft is sleeved with a torsional spring, one end of the torsional spring is fixedly connected with the first rotating shaft, and the other end of the torsional spring is fixedly connected with the connecting plate, and the bottom surface of the connecting plate is fixedly connected with a brush.

[0022] The connecting plates of the two groups of cleaning modules have a height difference therebetween.

[0023] As an optional solution, a plurality of protruding sliding grooves are formed in the left and right inner walls on the left and right sides of the model box in the sliding direction of the partition plate, the protruding sliding grooves correspond to the partition plates one by one, the length direction of the protruding sliding grooves is parallel to the sliding direction of the partition plate, and the partition plate slides in the protruding sliding grooves.

[0024] As an optional solution, a plurality of transverse sliding grooves are formed in the inner wall of the model box opposite to the strip-shaped opening, the transverse sliding grooves correspond to the partition plates one by one, a stopper is slidably arranged in the transverse sliding groove, the sliding direction of the stopper is parallel to the sliding direction of the partition plate, a second spring is further arranged in the transverse sliding groove, one end of the second spring is fixedly connected with the bottom of the transverse sliding groove, and the other end of the second spring is fixedly connected with the stopper.

[0025] The end of the protruding sliding groove, which points to the transverse sliding groove, has a spacing from the transverse sliding groove.

[0026] As an optional solution, a tapered block is further fixedly connected to the end of the partition plate that extends into the model box.

[0027] A test method of a mud supporting capacity testing device, comprising the following steps:

[0028] 1) a plurality of soil samples to be tested are taken, and a plurality of muds with different proportions for lubrication are prepared;

[0029] 2) according to the test scheme, corresponding soil and mud are selected, the volume V 土 , V 液 and the weight G 土 , G 液 are measured, and the specific gravity γ 土 , γ 液 of the soil and the mud is calculated;

[0030] 3) the soil and the mud are stirred uniformly, poured into the model box, and placed, and the overall weight is obtained through the bottom load sensor;

[0031] 4) after being placed for a certain period of time, the partition plates are inserted from bottom to top in sequence, so that the volume V of the mixed sample in each chamber is the same;

[0032] 5) The mixed sample weight G1-G5 in each chamber is obtained through the load sensor on the partition, and the volume of the soil in each chamber is calculated;

[0033] 6) The soil bearing capacity is calculated according to the total volume of the soil sample and the volume of the soil sample in each chamber.

[0034] As an optional solution, the method for calculating the soil and mud specific gravity γ 土 and γ 液 in step (1) is as follows:

[0035]

[0036]

[0037] The method for calculating the volume V n of the soil in each chamber in step (5) is as follows:

[0038] V n γ 土 +(V-V n )γ 液 =G n

[0039] (n=1, 2, 3, 4, 5)

[0040] Verify whether the total volume of the soil is equal:

[0041]

[0042] The method for calculating the bearing capacity η n of the mud on the soil in step (6) is as follows:

[0043]

[0044] Compare the average values of η1-η5, and compare the average error to obtain the soil bearing capacity of the mud.

[0045] As described above, the present application has at least the following beneficial effects:

[0046] 1. The present application can perform multiple tests under different soil working conditions, different soil contents, and different mud ratio conditions to test the optimal ratio of the mud to the soil support effect, so that the bearing capacity of the mud corresponding to different soil layers is determined, the resistance during shield pipe jacking is greatly reduced, the setting of relay stations is reduced, the construction period and cost of the pipe jacking are reduced, the use is simple, and the test effect is intuitive.

[0047] 2. The pushing unit can make the partition plate move synchronously or sequentially from bottom to top by the cooperation of the power module and the limiting module. The partition plate is inserted into the mixed sample by the spring instead of rigid contact between the mounting frame and the partition plate, so as to avoid damage to the partition plate and the load sensor during insertion.

[0048] 3. When the mounting frame moves towards the model box, the connecting plates are pushed by the side wall of the model box, and the two connecting plates are folded inward. After the test is completed, the mounting frame retreats, and under the action of the torsional spring, the two connecting plates swing to the two sides to open, and the bristles sweep away the residual sample on the partition plate to clean the partition plate and facilitate the next test.

[0049] 4. The transverse sliding groove is used for supporting the front end of the partition plate. In the initial state, the stop block is used for stopping the sample from entering the transverse sliding groove. When the partition plate is inserted into the transverse sliding groove, the stop block is pushed back, and the second spring is compressed. When the partition plate exits the transverse sliding groove, the second spring pushes the stop block to move outward to push the sample in the transverse sliding groove out. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is a schematic diagram of the whole invention.

[0051] Figure 2 It is a schematic diagram of the inside of the model box.

[0052] Figure 3 It is a schematic diagram of the first sliding groove.

[0053] Figure 4 It is an enlarged view of A of the invention. Figure 2

[0054] Figure 5 It is a schematic diagram of the pushing unit.

[0055] Figure 6 It is a schematic diagram of the storage groove.

[0056] In the figure: 101, model box; 102, strip-shaped opening; 103, partition plate; 104, load sensor; 105, protruding sliding groove; 106, transverse sliding groove; 107, stop block; 108, second spring; 109, conical block;

[0057] 201, mounting frame; 202, storage plate; 203, storage groove; 204, partition plate sliding block; 205, spring;

[0058] 301, first sliding groove; 302, first sliding block; 303, threaded rod; 304, limiting notch;

[0059] 401, first sliding rail; 402, second sliding block; 403, first telescopic rod;

[0060] ​501, first rotating shaft; 502, connecting plate; 503, torsional spring; 504, bristles. DETAILED DESCRIPTION

[0061] The following embodiments of the application are illustrated by way of specific examples, and other advantages and effects of the application will be readily appreciated by those skilled in the art from the following description.

[0062] Please refer to Figures 1 to 6 It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the defined conditions under which the application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the application, should still fall within the scope of the technology disclosed by the application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the specification are only for the convenience of clear description, and are not used to limit the scope of the application that can be implemented, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the application that can be implemented.

[0063] The following embodiments are only for illustration. The various embodiments can be combined, which are not limited to the content shown in the following single embodiment.

[0064] Please refer to Figures 1 to 3 The application provides a mud supporting capacity testing device, which comprises a model box 101, a plurality of strip-shaped openings 102 are uniformly arranged on the side wall of the model box 101 from bottom to top, a baffle 103 is slidably arranged at each strip-shaped opening 102, the baffle 103 divides the model box 101 into a plurality of chambers from bottom to top, the baffle 103 can slide in a direction away from the model box 101, and a load sensor 104 is arranged on the bottom surface of the model box 101 and the baffle 103.

[0065] The model box 101 is further provided with a pushing unit for pushing the plurality of baffles 103 to slide in sequence.

[0066] In this embodiment, the staff needs to pre-sample a plurality of soil samples under different working conditions, and then configure a plurality of lubricating muds with different proportions. The lubricating mud is usually composed of high-quality bentonite, sodium carboxymethyl cellulose, soda ash and water, and one of the proportions is 11:0.2:0.5:100. The higher the proportion of high-quality bentonite, the more viscous the lubricating mud.

[0067] When the mud bearing capacity test needs to be carried out, the mud and the soil sample corresponding to the experimental scheme are mixed and stirred, and then are put into the model box 101, the load sensor 104 at the bottom of the model box 101 collects the total weight of the mixed sample (mud and soil sample), because the amount of mud is more than that of the soil sample, after standing for a period of time, the soil sample will settle in the mud, and then the model box 101 is divided into several chambers from top to bottom by the partition plate 103, because each partition plate 103 is arranged uniformly from bottom to top, the volume of each chamber is the same, and the volume of the mixed sample in each chamber is also the same, but because the soil sample settles, the weight of the mixed sample in each layer may be different, the load sensor 104 on each partition plate 103 collects the weight of the mixed sample in each chamber respectively, and finally the volume of the soil sample in each mixed sample is obtained through a calculation formula, and then the settlement range of the soil and the supporting effect of the mud on the soil are obtained;

[0068] The partition plate 103 is always located in the strip-shaped opening 102 and is attached to the strip-shaped opening 102, so that the mixed sample does not leak out of the strip-shaped opening 102;

[0069] The application can carry out multiple tests under different soil conditions, different soil contents and different mud mixing conditions, test the best mixing ratio of mud to soil supporting effect, and therefore determine the mud bearing capacity corresponding to different soil layers, so that the resistance during shield pipe jacking can be greatly reduced, the setting of relay stations can be reduced, the construction period and cost of the pipe jacking can be reduced, the application is simple, and the test effect is intuitive.

[0070] Please refer to Figure 5 and Figure 6 , the pushing unit comprises a mounting frame 201, a receiving plate 202, a receiving groove 203, a partition plate sliding block 204 and a spring 205;

[0071] The mounting frame 201 is located on one side of the strip-shaped opening 102 and can slide away from the model box 101, a plurality of receiving plates 202 are fixedly connected to the mounting frame 201 from bottom to top, the receiving plates 202 correspond to the partition plates 103 one by one, the side of each receiving plate 202 facing the model box 101 is provided with a receiving groove 203, one end of each partition plate 103 extends into the receiving groove 203 and is fixedly connected with a partition plate sliding block 204, the partition plate sliding block 204 slides away from the model box 101, and the receiving groove 203 is also provided with a spring 205, one end of the spring 205 is fixedly connected with the bottom of the receiving groove 203, and the other end is fixedly connected with the partition plate sliding block 204;

[0072] The pushing unit further comprises a power module for driving the movement of the mounting frame 201 and a limiting module for limiting the movement of the partition plate 103.

[0073] In this embodiment, the power module drives the mounting frame 201 to move towards the model box 101, and the mounting frame 201 can drive all the partitions 103 to be inserted into the model box 101 at the same time;

[0074] When the partitions 103 need to be inserted into the model box 101 from bottom to top in sequence, the limiting module can limit the movement of all the partitions 103, and when the mounting frame 201 moves, the partition sliding block 204 slides in the storage groove 203, and the spring 205 is compressed. Through the switching of the limiting module, the partitions 103 are inserted into the model box 101 from bottom to top in sequence.

[0075] Please refer to Figure 3 and Figure 5 , the limiting module includes two sets of limiting components, and the two sets of limiting components are arranged on the side wall of the model box 101 and are located on the left and right sides of the sliding direction of the mounting frame 201;

[0076] The limiting component includes a first sliding groove 301, a first sliding block 302, a threaded rod 303, and a limiting notch 304.

[0077] The first sliding groove 301 is opened on the side wall of the model box 101, and the sliding direction is perpendicular to the ground. A plurality of first sliding blocks 302 are slidably arranged in the first sliding groove 301. The first sliding blocks 302 correspond to the partitions 103 one by one. The length of the first sliding block 302 located above in the sliding direction is greater than that of the first sliding block 302 below. A threaded rod 303 is also rotatably arranged in the first sliding groove 301. The axis of the threaded rod 303 is parallel to the first sliding groove 301. The first sliding block 302 is sleeved on the threaded rod 303 and is threadedly connected with the threaded rod 303.

[0078] The side edges of the partitions 103 towards the two sets of limiting components are provided with limiting notches 304. One end of the first sliding block 302 is located in the limiting notch 304.

[0079] In this embodiment, a servo motor is installed on the threaded rod 303 as a power source. When the threaded rod 303 rotates, it drives the plurality of first sliding blocks 302 to move up and down. One first sliding block 302 corresponds to one partition 103. When the first sliding block 302 is located in the limiting notch 304, it will block the movement of the partition 103.

[0080] When the threaded rod 303 rotates, all the first sliding blocks 302 move up and down and move away from the position of the limiting notch 304, and the partition 103 can move freely. The length of the first sliding block 302 located above is greater than that of the first sliding block 302 below. Therefore, all the first sliding blocks 302 move synchronously, but the first sliding block 302 located above moves away from the position of the limiting notch 304 later.

[0081] Please refer to Figure 1The power module comprises a first sliding rail 401, a second sliding block 402 and a first telescopic rod 403.

[0082] The first sliding rail 401 is located on one side of the strip-shaped opening 102 and has a length direction perpendicular to the side wall of the model box 101. The second sliding block 402 is slidingly installed on the first sliding rail 401. The mounting bracket 201 is fixedly connected to the top surface of the second sliding block 402.

[0083] The first telescopic rod 403 is also installed on the side wall of the model box 101. The telescopic direction of the first telescopic rod 403 is parallel to the sliding direction of the first sliding rail 401. The telescopic end of the first telescopic rod 403 is fixedly connected to the mounting bracket 201.

[0084] In this embodiment, the first telescopic rod 403 is telescoped to pull the mounting bracket 201. The second sliding block 402 at the bottom of the mounting bracket 201 slides on the first sliding rail 401.

[0085] Please refer to Figure 5 and Figure 6 The pushing unit further comprises two groups of cleaning modules. The two groups of cleaning modules are both installed on the top surface of the storage plate 202 and are respectively close to the left and right sides of the sliding direction of the mounting bracket 201.

[0086] The cleaning module comprises a first rotating shaft 501, a connecting plate 502, a torsional spring 503 and brush hairs 504.

[0087] The first rotating shaft 501 is rotatably installed on the top surface of the storage plate 202. The axis of the first rotating shaft 501 is perpendicular to the top surface of the storage plate 202. The top of the first rotating shaft 501 is fixedly connected with the connecting plate 502. The other end of the connecting plate 502 is directed to the model box 101. The first rotating shaft 501 is sleeved with the torsional spring 503. One end of the torsional spring 503 is fixedly connected with the first rotating shaft 501 and the other end is fixedly connected with the connecting plate 502. The bottom surface of the connecting plate 502 is fixedly connected with the brush hairs 504.

[0088] The connecting plates 502 of the two groups of cleaning modules have a height difference.

[0089] In this embodiment, the length direction of the connecting plate 502 has a certain angle with the side wall of the model box 101 in the initial state. When the mounting bracket 201 moves towards the model box 101 and drives the partition plate 103 to insert into the model box 101, the end of the connecting plate 502 directed to the model box 101 is in contact with the side wall of the model box 101. The connecting plate 502 is pushed by the side wall of the model box 101 to rotate the first rotating shaft 501 and twist the torsional spring 503. The two connecting plates 502 are folded inwards and have a height difference, so they are staggered with each other.

[0090] When the test is over, the installation frame 201 retreats to pull the partition plate 103 away from the model box 101, and the connecting plates 502 lose the restriction of the side wall of the model box 101, and are rotated under the action of the torsion spring 503, and swing to the two sides to open, and the bristles 504 sweep the residual soil sample on the partition plate 103 to clean the partition plate 103.

[0091] Please refer to Figures 1 to 3 , a plurality of protruding sliding grooves 105 are arranged on the left and right side walls in the sliding direction of the partition plate 103, the protruding sliding grooves 105 correspond to the partition plate 103 one by one, and the length direction of the protruding sliding grooves 105 is parallel to the sliding direction of the partition plate 103, and the partition plate 103 slides in the protruding sliding grooves 105.

[0092] In this embodiment, the two sides of the partition plate 103 slide in the protruding sliding grooves 105, and the protruding sliding grooves 105 can block the limiting gap 304.

[0093] Please refer to Figures 2 to 4 , a plurality of horizontal sliding grooves 106 are arranged on the inner wall of the side of the model box 101 opposite to the strip-shaped opening 102, the horizontal sliding grooves 106 correspond to the partition plate 103 one by one, a stopper 107 is arranged to slide in the horizontal sliding groove 106, the sliding direction of the stopper 107 is parallel to the sliding direction of the partition plate 103, and a second spring 108 is further arranged in the horizontal sliding groove 106, one end of the second spring 108 is fixedly connected with the bottom of the horizontal sliding groove 106, and the other end is fixedly connected with the stopper 107.

[0094] The end of the protruding sliding groove 105 pointing to the horizontal sliding groove 106 has a spacing from the horizontal sliding groove 106.

[0095] In this embodiment, the partition plate 103 is inserted into the model box 101, the two side edges are supported by the protruding sliding grooves 105, and the front end is supported by the horizontal sliding groove 106, so that uneven stress is avoided and the internal sensor is not damaged.

[0096] After the soil sample is put into the model box 101, it may enter the protruding sliding groove 105, because the end of the protruding sliding groove 105 has a spacing from the horizontal sliding groove 106, and when the partition plate 103 slides in the protruding sliding groove 105, the soil sample can be pushed out from the end of the protruding sliding groove 105.

[0097] In the initial state, the second spring 108 in the horizontal sliding groove 106 pushes the stopper 107 to block the horizontal sliding groove 106, so that the soil sample cannot enter the horizontal sliding groove 106, when the partition plate 103 is inserted into the horizontal sliding groove 106, the stopper 107 is pushed back, the second spring 108 is compressed, and when the partition plate 103 exits the horizontal sliding groove 106, the second spring 108 pushes the stopper 107 to push the soil sample that may enter the horizontal sliding groove 106 out.

[0098] Please refer to Figure 6 The end of the partition plate 103 extending into the mold box 101 is also fixedly connected with a tapered block 109.

[0099] In this embodiment, the tapered block 109 can make the soil sample move along the inclined surface to the partition plate 103.

[0100] A test method of a mud supporting capacity testing device, comprising the following steps:

[0101] 1) Take several soil samples to be tested, and prepare several muds with different proportions for lubrication;

[0102] 2) According to the test scheme, select the corresponding soil and mud, measure the volume V 土 , V 液 and the weight G 土 , G 液 , and calculate the specific gravity γ 土 , γ 液 of the soil and mud;

[0103] 3) Stir the soil and mud evenly, pour into the mold box and stand, and obtain the overall weight through the bottom load sensor;

[0104] 4) After standing for a certain period of time, insert the partition plate from bottom to top, so that the volume V of the mixed sample in each chamber is the same;

[0105] 5) Number the partition areas from bottom to top as ①-⑤, respectively, obtain the weight G1-G5 of the mixed sample in each chamber through the load sensor on the partition plate, and calculate the volume of the soil in each chamber;

[0106] 6) Calculate the soil bearing capacity according to the total volume of the soil sample and the volume of the soil sample in each chamber.

[0107] The method for calculating the specific gravity γ 土 , γ 液 of the soil and mud in step (1) is:

[0108]

[0109]

[0110] The method for calculating the volume V n of the soil in each chamber in step (5) is:

[0111] V n γ 土 +(V-V n )γ 液 =G n

[0112] (n takes 1, 2, 3, 4, 5)

[0113] Verify whether the total volume of the soil is equal:

[0114]

[0115] Step (6) calculates the bearing capacity of the soil by the mud η n The method is:

[0116]

[0117] Compare the average value of η1 to η5, and compare the average error to obtain the soil bearing capacity of the mud.

[0118] In this embodiment, the staff needs to sample several different soil samples under different working conditions in advance, and configure several lubricating muds with different formula proportions. According to the test scheme, the mud and the soil sample are selected, the volume and weight are measured and calculated first, and then the mixed sample (mud and soil sample) is stirred and mixed into the model box 101, and finally the plastic wrap is sealed to ensure the sealing;

[0119] The load sensor 104 at the bottom of the model box 101 collects the total weight of the mixed sample (mud and soil sample), and after standing for a period of time, the soil sample settles in the mud, and then the model box 101 is divided into several chambers from top to bottom by the partition plate 103. Because the model box 101 is designed to have the same volume in each layer chamber, the volume of the mixed sample in each layer chamber is ensured to be the same through the partition plate 103, and the weight of the mixed sample in each chamber is obtained through the load sensor on each layer partition plate 103. Because the content of the soil sample in the mixed sample in each layer chamber is different, the weight of the mixed sample in each layer is also different;

[0120] Finally, the volume of the soil in each chamber is calculated, and the average error is compared to obtain the soil bearing capacity of the mud.

[0121] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A mud bearing capacity testing device, characterized in that, The device includes a model box, and the side wall of the model box is evenly provided with a number of strip-shaped openings from bottom to top. A partition is slidably provided at each strip-shaped opening. The partition divides the model box into a number of chambers from bottom to top. The partition can slide in a direction away from the model box. A load sensor is installed on the bottom surface of the model box and on the partition. The model box is also equipped with a pushing unit that pushes several partitions to slide in sequence. The pushing unit includes a mounting bracket, a storage plate, a storage slot, a partition slider, and a spring; The mounting bracket is located on the side of the strip opening and can slide away from the model box. The mounting bracket has several storage plates fixed from bottom to top. Each storage plate corresponds to a partition. Each storage plate has a storage slot on the side facing the model box. One end of each partition extends into the storage slot and is fixed with a partition slider. The partition slider slides away from the model box. The storage slot is also equipped with a spring. One end of the spring is fixed to the bottom of the storage slot, and the other end is fixed to the partition slider. The pushing unit also includes a power module for driving the mounting bracket to move and a limiting module for restricting the movement of the partition; The limiting module includes two sets of limiting components, which are disposed on the side wall of the model box and located on the left and right sides of the sliding direction of the mounting frame, respectively. Each of the limiting components includes a first slide groove, a first slider, a threaded rod, and a limiting notch; The first slide groove is opened on the side wall of the model box and the sliding direction is perpendicular to the ground. Several first sliders are slidably arranged in the first slide groove. The first sliders correspond one-to-one with the partition. The sliding length of the upper first slider is greater than that of the lower first slider. A threaded rod is also rotatably installed in the first slide groove. The axis of the threaded rod is parallel to the first slide groove. The first sliders are all sleeved on the threaded rod and threadedly connected to the threaded rod. The partition plate has limit notches on its sides facing the two sets of limiting components, and one end of the first slider is located inside the limit notch.

2. The mud bearing capacity testing device according to claim 1, characterized in that, The power module includes a first slide rail, a second slider, and a first telescopic rod; The first slide rail is located on one side of the strip opening, and the length direction of the first slide rail is perpendicular to the side wall of the model box. The second slider is slidably mounted on the first slide rail, and the mounting bracket is fixed to the top surface of the second slider. A first telescopic rod is also installed on the side wall of the model box. The telescopic direction of the first telescopic rod is parallel to the sliding direction of the first slide rail, and the telescopic end of the first telescopic rod is fixedly connected to the mounting frame.

3. The mud bearing capacity testing device according to claim 1, characterized in that, The pushing unit also includes two sets of cleaning modules, both of which are installed on the top surface of the storage plate and are respectively close to the left and right sides of the sliding direction of the mounting frame. Each cleaning module includes a first rotating shaft, a connecting plate, a torsion spring, and brush bristles; The first rotating shaft is rotatably mounted on the top surface of the storage plate. The axis of the first rotating shaft is perpendicular to the top surface of the storage plate. A connecting plate is fixedly connected to the top of the first rotating shaft. The other end of the connecting plate points to the model box. A torsion spring is sleeved on the first rotating shaft. One end of the torsion spring is fixedly connected to the first rotating shaft, and the other end is fixedly connected to the connecting plate. Brush bristles are fixedly connected to the bottom surface of the connecting plate. The connecting plates of the two cleaning modules have a height difference.

4. The mud bearing capacity testing device according to claim 1, characterized in that, The model box has several raised grooves on the inner walls of the left and right sides of the partition sliding direction. Each raised groove corresponds to a partition, and the length direction of the raised groove is parallel to the sliding direction of the partition. The partition slides within the raised groove.

5. The mud bearing capacity testing device according to claim 4, characterized in that, The inner wall of the model box opposite to the strip opening is provided with several horizontal sliding grooves. Each horizontal sliding groove corresponds to a partition. A stop block is slidably arranged in the horizontal sliding groove. The sliding direction of the stop block is parallel to the sliding direction of the partition. A second spring is also provided in the horizontal sliding groove. One end of the second spring is fixedly connected to the bottom of the horizontal sliding groove, and the other end is fixedly connected to the stop block. The raised groove has a gap between one end of the horizontal groove and the horizontal groove.

6. The mud bearing capacity testing device according to claim 1, characterized in that, A conical block is also fixed to one end of the partition that extends into the model box.

7. The test method based on the mud bearing capacity testing device according to claim 1, characterized in that, Includes the following steps: 1) Take samples of several types of soil to be tested and prepare several types of lubricating mud with different proportions; 2) Select the appropriate soil and mud according to the test plan, determine their volume Vsoil, Vliquid and weight Gsoil, and calculate the unit weight γsoil and γliquid of the soil and mud. 3) Mix the soil and mud evenly, pour it into the model box and let it stand. Obtain the overall weight through the bottom load sensor. 4) After standing for a certain period of time, insert partitions from bottom to top to ensure that the volume V of the mixed sample in each chamber is the same. 5) The chambers are numbered from bottom to top. The weight of the mixed sample in each chamber is obtained by the load sensor on the partition, and the volume of soil in each chamber is calculated. 6) Calculate the soil bearing capacity based on the total volume of the soil sample and the volume of the soil sample in each chamber.

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