CN214539010U

CN214539010U - Impervious wall-core wall large deformation interaction testing device

Info

Publication number: CN214539010U
Application number: CN202120024976.8U
Authority: CN
Inventors: 余翔; 薛冰寒; 王钰轲; 赵小华; 王淦; 玉努斯江·吐拉买提
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-10-29
Anticipated expiration: 2031-01-06

Abstract

The utility model provides a cut-off wall-core wall large deformation interact testing arrangement, one side tank wall of mold box through spring coupling with the incomplete limit board of the parallel incomplete of one side tank wall, still be equipped with the displacement sensor who measures the translation volume of incomplete limit board between incomplete limit board and the mold box, incomplete limit board encloses into the model cavity with all the other side tank walls, be equipped with in the model cavity and found the concrete cut-off wall immediately in central authorities, fill in the overburden filling of concrete cut-off wall hypomere and fill in and bury the core wall filling of concrete cut-off wall upper segment, distributed optical fiber sensor has been preset to the wall of concrete cut-off wall, the joint department of core wall filling and concrete cut-off wall is provided with the soil pressure cell. The utility model discloses a to the real-time accurate measurement and the visual dynamic monitoring of the big deformation in-process deformation of cut-off wall-core wall, provide the foundation for revealing the cut-off wall-core wall is out of shape the interaction mechanism greatly.

Description

Impervious wall-core wall large deformation interaction testing device

Technical Field

The utility model relates to a hydraulic structure test technical research field, in particular to cut-off wall-core wall large deformation interaction testing arrangement.

Background

The hydropower is clean low-carbon renewable energy with mature technology and flexible operation. The western regions of China are rich in water energy resources, account for more than 80% of national reserves, but are low in development degree. In order to relieve the ever-increasing power demand pressure in China and promote the economic development of western regions, the establishment of high dam garages with good regulation performance in the western regions has become a national major strategic demand. However, the geological conditions in western regions of China are complex, and the riverbeds of most rivers have covering layers, which is a problem that the dam construction is difficult to avoid. The dam directly built on the covering layer can save the engineering investment greatly, shorten the construction period and is beneficial to environmental protection. However, the covering layer is usually soil with strong deformation capability such as sand gravel or fine-particle sand, which causes great deformation of the dam and thus poses great threat to the safety of the dam. The existing data show that some dam sites in the planning have covering layers with the depth of more than 100m, and the covering layer depth of a certain control engineering can even reach 500 m. The problem of the deformation safety of dams on deep coverage is of high social concern.

The earth-rock dam can be made of local materials, has high construction speed and strong adaptability to complex foundations, and is widely applied to hydropower development at home and abroad. The construction level of the soil core wall dam is mature, the double-estuary soil core wall dam built in China will become the first high dam in the world, but the experience in the design and construction of the soil core wall dam building a deep covering layer at home and abroad is still relatively inexperienced. For earth core dams on deep overburden, ensuring dam seepage prevention safety is a primary task. The method of directly pouring the concrete impervious wall in the covering layer is the most common method for controlling the seepage of the dam foundation, and an impervious joint for connecting the impervious wall and the core wall is required to be arranged at the bottom of the core wall so as to ensure the integrity and continuity of an impervious system of the dam. Under the action of the gravity of the dam body, the impervious wall and the core wall with greatly different material characteristics have larger uneven settlement at the joint part to cause strong soil-structure interaction, so that the joint part is in an adverse stress state, and the safety of the dam is threatened. Therefore, it is important to accurately and reasonably describe the characteristics of the large deformation interaction between the diaphragm wall and the core wall at the joint part, and a testing device and a using method for the large deformation interaction between the diaphragm wall and the core wall are urgently needed to provide reference for the design and construction of the earth core wall dam on the deep covering layer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cut-off wall-core wall large deformation interact testing arrangement, its technical scheme as follows:

the device for testing the large deformation interaction of the impervious wall and the core wall comprises a transparent model box with an opening at the top and an industrial camera arranged outside the transparent model box, wherein the wall of one side of the model box is connected with a non-complete side limit plate parallel to the wall of the one side through a spring, a displacement sensor for measuring the translation amount of the non-complete side limit plate is also arranged between the non-complete side limit plate and the model box, the non-complete side limit plate and the other side box walls enclose a model cavity, a concrete impervious wall vertically arranged in the center, covering layer filling filled at the lower section of the concrete impervious wall and core wall filling filled and buried at the upper section of the concrete impervious wall are arranged in the model cavity, a distributed optical fiber sensor is preset on the wall surface of the concrete impervious wall, a concrete pressure box and a concrete pressure box are arranged at the joint of the core wall filling and the concrete impervious wall, the distributed optical fiber sensor and the industrial camera are connected with the data acquisition controller through data lines.

Preferably, a loading part is arranged above the core wall filling soil, the loading part comprises a vertically arranged screw fixed around a model box, the screw is connected with a cross beam which is positioned above the model box and is sleeved on the periphery of the screw in an empty mode and two nuts which respectively abut against the upper surface and the lower surface of the cross beam, a hydraulic servo loader for outputting linear power is fixed on the cross beam, the output end of the hydraulic servo loader is connected with a vertically arranged dowel bar, the lower end of the dowel bar is connected with a guide frame through a pressure sensor, and the lower end of the guide frame is connected with a bearing plate which is flatly paved on the top surface of the core wall filling soil.

Preferably, the edge of the bearing plate is provided with a rectangular groove which is through up and down, the rectangular groove is internally connected with a convex tooth which can relatively slide up and down and horizontally insert, the wall of the rectangular groove is provided with a control groove which is positioned on the wall surface, a compensation groove which is positioned on the bottom surface and is communicated with the edge of the bearing plate and a guide gap which is communicated between the compensation groove and the control groove, the guide gap forms a necking throat part between the compensation groove and the control groove, the control groove is internally provided with a control key tooth which is connected with the convex tooth in an inserting way along the opening direction and is propped against the side surface of the convex tooth, a first spring which is elastically propped against one end of the control key tooth far away from the convex tooth and a control contact which is propped against one side of the control key tooth far away from the edge of the bearing plate, the bottom of the control contact is connected with a connecting part which passes through the guide gap and slides in the guide gap along the length direction, the lower end of the connecting part is connected with the compensation plate which is connected with the compensating groove in an inserting way and can extend out from the edge of the bearing plate, one end of the compensation plate, which is far away from the edge of the bearing plate, is connected with a second spring in an abutting mode.

The utility model has the advantages that:

the utility model discloses a to the control of big deformation degree, realized among the big deformation process cut-off wall-heart wall stress and the real-time dynamic measurement of deformation, realized the dynamic imaging of big deformation process soil body stress and meet an emergency, the device simple manufacture, it is with low costs, convenient operation.

Drawings

FIG. 1 is a schematic view of the testing device of the present invention;

FIG. 2 is a schematic view illustrating a connection structure of the bearing plate and the non-full side confining plate of FIG. 1;

FIG. 3 is a schematic view of the walls of the rectangular recess of FIG. 2;

fig. 4 is a schematic cross-sectional view of the walls of the rectangular groove of fig. 2.

Detailed Description

Referring to fig. 1-4, this example illustrates the diaphragm wall 4-core interaction under a vertical load of 200kN, with a 35 mm free length of 100 mm side deflection. The impervious wall 4-core wall large deformation interaction testing device mainly comprises a loading part, a data acquisition and processing part and a model box 9 part. The loading part comprises an object stage 6, a screw 7, a screw 10, a bearing plate 8, a cross beam 12, a nut 13, a hydraulic servo loader 14, a pressure sensor 11, a guide frame 21 and a dowel bar 22, the data acquisition and processing part comprises a distributed optical fiber sensor 5, an industrial camera 17, a tripod 16, a soil pressure box 18, a displacement sensor 19, a data processing workstation 20 and a data acquisition controller 24, and the model box 9 part comprises an incomplete side limiting plate 1, a covering layer filling soil 2, a core wall filling soil 3, an impervious wall 4, a model box 9 and a third spring 15. Vertical load is provided through the hydraulic servo loader 14, large deformation of the soil body is simulated through the incomplete side limiting plate 1 and the third spring 15, and the distributed optical fiber sensor 5, the soil pressure cell 18, the displacement sensor 19 and the industrial camera 17 are connected with the data processing workstation 20 and the data acquisition controller 24 through the data line 23.

The screw 7, the nut 13, the object stage 6 and the beam 12 form a reaction frame, and the hydraulic servo loader 14 is fixed on the beam 12. The hydraulic servo loader 14 and the pressure sensor 11 are connected with a data acquisition controller 24 through a data line 23, and the data acquisition controller 24 is connected with the data processing workstation 20 through the data line 23. The pressure sensor 11 is arranged between the lower end of the dowel bar 22 and the guide frame 21, the pressure sensor 11 is fixed at the lower end of the dowel bar 22, the upper part of the guide frame 21 is a stainless steel bar with the same size as the dowel bar 22, the lower part of the guide frame 21 is in a claw shape, the supporting claws at two sides are tightly contacted with the bearing plate 8, and the bearing plate 8 and the guide frame 21 are fixed together through the screw 10. The model box 9 is arranged on the object stage 6, the left side and the right side of the model box 9 are both provided with incomplete limiting plates, and three third springs 15 and three displacement sensors 19 are uniformly arranged between one incomplete limiting plate and the side wall of the model box 9 in a vertically crossed manner. Two distributed optical fiber sensors 5 are arranged on the surface of the impervious wall 4. The soil pressure boxes 18 are arranged at the joints of the core wall filling 3 and the impervious wall 4, and the total number is four. The industrial camera 17 is a customized high-definition camera, is fixed on three shelves, and is connected with a data acquisition controller 24 through a data line 23. The covering layer filling 2 is sand-stone mixture, the core wall filling 3 is clay, the core wall filling is paved in a model box 9 with equal thickness, and the thickness of the impervious wall 4 is higher than that of the covering layer filling 2.

The edge of the bearing plate 8 is provided with a rectangular groove 32 which is penetrated up and down, a convex tooth 25 which can slide up and down and horizontally is connected in the rectangular groove 32 in a pulling and inserting way, a control groove which is positioned on the wall surface, a compensation groove which is positioned on the bottom surface and is communicated with the edge of the bearing plate 8 and a guide gap which is communicated between the compensation groove and the control groove are arranged on the groove wall 26 of the rectangular groove 32, the guide gap forms a necking throat part between the compensation groove and the control groove, a control key tooth 27 which is connected in a pulling and inserting way along the opening direction and is propped against the side surface of the convex tooth 25, a first spring 28 which is elastically propped against one end of the control key tooth 27 far away from the convex tooth 25 and a control contact 29 which is propped against one side of the control key tooth 27 far away from the edge of the bearing plate 8 are arranged in the control groove, the bottom of the control contact 29 is connected with a connecting part 30 which penetrates through the guide gap and slides in the guide gap along the length direction, the lower end of the connecting portion 30 is connected with a compensation plate 31 which is inserted into the compensation groove and can extend from the edge of the bearing plate 8, and one end of the compensation plate 31 far away from the edge of the bearing plate 8 is connected with a second spring 32 in a propping manner. The control key teeth 27 are provided in a plurality and are arranged side by side in the control slot, and preferably a partition wall is provided between adjacent control key teeth to ensure that the sliding of the insertion of the respective control key teeth 27 does not interfere with each other.

The use method of the test device is as follows:

step 1, firstly, arranging a distributed optical fiber sensor 5 on the surface of a prefabricated concrete impervious wall 4, vertically placing the prefabricated concrete impervious wall in the center of a model box 9, filling a space between an incomplete side limiting plate 1 and the side wall of the model box 9 by using a solid plate, backfilling covering layer filling soil 2 on two sides of the impervious wall 4, compacting in layers, and slightly compacting the contact position of the impervious wall 4 and the distributed optical fiber sensor 5 to avoid damaging the sensor;

step 2, continuously compacting and filling core wall filling soil 3 on the covering layer in a layering manner, arranging a soil pressure box 18 at the joint of the core wall filling soil 3 and the impervious wall 4 when the filling height is flush with the impervious wall 4, and then continuously filling and compacting the core wall filling soil in a layering manner to a set height;

step 3, fixing the guide frame 21 and the pressure bearing plate 8 together through a screw 10, placing the guide frame on a soil body, and adjusting the hydraulic servo loader 14 to enable the pressure sensor 11 at the lower part of the dowel bar 22 to be in contact with the guide frame 21;

step 4, slightly drawing out a solid plate between the incomplete side limiting plate 1 and the side wall of the model box 9, placing a third spring 15 and a displacement sensor 19 on one side of the solid plate, erecting an industrial camera 17 to adjust a tripod 16 to a set height, and connecting a sensor and an industrial camera 17 data wire 23 to a data acquisition controller 24;

and 5, debugging each sensor and each camera through the data processing workstation 20, setting kN vertical load on the hydraulic servo loader 14 to start a test until the soil body is completely damaged.

And 6, repeating the steps, adjusting the third springs 15 with different vertical pressures and different specifications for testing, and obtaining the interaction mechanism of the impervious wall 4-core wall under the conditions of different vertical loads and different lateral limit deformations.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, but should not be construed as limiting the claims, and the present invention is not limited to the above-described embodiments, but may be modified in various ways. In summary, all changes that can be made within the scope of the independent claims of the present invention are within the scope of the present invention.

Claims

1. A kind of impervious wall-core wall large deformation interaction testing device, characterized by, including the transparent model box with open top and its external industrial camera, the tank wall of one side of the model box connects with the incomplete side limiting board parallel to the tank wall of said one side through the spring, also there is displacement sensor to measure the translation quantity of the incomplete side limiting board between the incomplete side limiting board and the model box, the incomplete side limiting board and the other side tank wall enclose the model cavity, there are concrete impervious wall erected in the centre, the covering layer filling filled in the lower section of the concrete impervious wall and the core wall filling filled and buried in the upper section of the concrete impervious wall in the model cavity, the wall of the concrete impervious wall presets the distributed optical fiber sensor, the impervious wall filling and the joint of the concrete impervious wall are equipped with the pressure box, the distributed optical fiber sensor and the industrial camera are connected with the data acquisition controller through data lines.

2. The impervious wall-core wall large deformation interaction testing device as claimed in claim 1, wherein a loading part is arranged above the core wall filling, the loading part comprises a screw rod vertically fixed around a model box, the screw rod is connected with a cross beam which is positioned above the model box and is sleeved on the periphery of the screw rod in an empty way and two nuts which respectively abut against the upper surface and the lower surface of the cross beam, a hydraulic servo loader for outputting linear power is fixed on the cross beam, the output end of the hydraulic servo loader is connected with a vertically arranged force transfer rod, the lower end of the force transfer rod is connected with a guide frame through a pressure sensor, and the lower end of the guide frame is connected with a bearing plate which is flatly paved on the top surface of the core wall filling.

3. The cutoff wall-core wall large deformation interaction testing device according to claim 2, wherein the edge of the bearing plate is provided with a rectangular groove which is penetrated from top to bottom, a convex tooth which can slide up and down and be horizontally inserted and pulled is connected in a pulling and inserting way in the rectangular groove, the wall of the rectangular groove is provided with a control groove which is positioned on the wall surface, a compensation groove which is positioned on the bottom surface and is communicated with the edge of the bearing plate and a guide notch which is communicated between the compensation groove and the control groove, the guide notch forms a necking throat part between the compensation groove and the control groove, the control groove is internally provided with a control key tooth which is connected in a pulling and inserting way along the opening direction and is abutted against the side surface of the convex tooth, a first spring which is elastically abutted against one end of the control key tooth far away from the convex tooth and a control contact which is abutted against one side of the control key tooth far away from the edge of the bearing plate, the bottom of the control contact is connected with a connecting part which penetrates through the guide notch and is guided and slides in the guide notch along the length direction, the lower extreme of connecting portion is connected with takes out and inserts the compensation board of connecting in the compensation groove and can follow the bearing plate border and stretch out, and the one end of keeping away from the bearing plate border of compensation board is supported to push away and is connected with the second spring.