Triaxial apparatus

Abstract

The invention relates to the technical field of rock and soil tests, in particular to a triaxial apparatus which comprises a base, a lifting mechanism, a confining pressure mechanism, a force measuring mechanism and a correction mechanism, the lifting mechanism comprises a sealing seat, a bottom plate and a lifting assembly, the sealing seat is arranged on the base, and the bottom plate is in concentric sliding connection with the sealing seat through the lifting assembly; a water injection hole is formed in the bottom plate and used for placing a sample, the confining pressure mechanism comprises a surrounding cover, an exhaust part, a cap and a main shaft, the surrounding cover is detachably and hermetically connected with the sealing seat, the exhaust part is arranged above the surrounding cover and used for exhausting during water injection, the cap is placed above the sample, and the main shaft slides on the surrounding cover, abuts against the cap and is connected with the force measuring mechanism; the correction mechanism comprises correction blocks and an adjusting assembly, and the multiple correction blocks abut against the test peripheral side wall and are used for centralizing the sample; the adjusting assembly is arranged on the surrounding cover and connected with the surrounding cover in a sealed mode, and the adjusting assembly is used for synchronously adjusting the positions of the multiple correcting blocks. The method has the effect of reducing the influence on the test result.

Description

Technical Field

[0001] The present application relates to the technical field of geotechnical testing, and in particular to a triaxial apparatus. Background Art

[0002] At present, with the rapid development of economy, the scale and complexity of civil engineering projects are increasing, and the research on the stability, static and dynamic deformation characteristics of geotechnical buildings and foundations is becoming increasingly important. However, in-depth research on these issues requires advanced testing instruments and high-precision testing technology.

[0003] The triaxial apparatus consists of a device that can apply forces in three directions, namely radial and two tangential directions, to simulate different stress states. During the test, the soil or rock sample is placed in a specially designed specimen chamber and loaded to the desired stress state. Then, shear stress is applied, usually by a piston and oil pressure system.

[0004] However, when the triaxial instrument is used to install the specimen, the specimen is prone to tilt, resulting in the main shaft and the specimen not being vertical. During the test, this causes errors in the detection results of the pressure sensor connected to the upper part of the main shaft, thereby affecting the accuracy of the test results. Summary of the invention

[0005] In order to reduce the impact on the test results, the present application provides a triaxial apparatus.

[0006] The present application provides a triaxial apparatus, which adopts the following technical solution: A triaxial instrument comprises a base, a lifting mechanism, a confining pressure mechanism, a force measuring mechanism and a correction mechanism, wherein the lifting mechanism comprises a sealing seat, a bottom plate and a lifting assembly, wherein the sealing seat is arranged on the base, and the bottom plate is concentrically slidably connected with the sealing seat through the lifting assembly; a water injection hole is provided on the bottom plate and is used to place a sample, wherein the confining pressure mechanism comprises a shroud, an exhaust member, a cap and a main shaft, wherein the shroud is detachably and sealably connected to the sealing seat, the exhaust member is arranged above the shroud and is used to exhaust gas when water is injected, and the cap is placed above the sample and is provided with a back pressure hole, The back-pressure hole is connected to the force measuring mechanism; the main shaft seal slides on the upper end surface of the enclosure, abuts against the cover cap and is connected to the force measuring mechanism, and the force measuring mechanism is also connected to the water injection hole of the bottom plate; the correction mechanism includes a correction block and an adjustment assembly, at least three correction blocks slide on the enclosure, and the three correction blocks are arranged at equal intervals along the circumference of the enclosure, and the correction blocks abut against the side walls of the test circumference to straighten the specimen; the adjustment assembly is arranged on the enclosure and is seal-connected to the enclosure, and the adjustment assembly is used to synchronously adjust the positions of multiple correction blocks.

[0007] By adopting the above technical scheme, when testing the soil sample, the water filter strip after soaking is pasted on the side wall of the sample, and the filter paper is pasted on both ends. Then, permeable stones are placed on both ends of the sample, and a rubber sleeve is set on the outside of the sample. Then, the bottom plate is vented until the water overflows. Then, the sample is placed on the bottom plate, and the rubber sleeve is set on the bottom plate. Then, the cap is placed on the permeable stone at the upper end of the sample, and the rubber sleeve is set on the cap. Then, the enclosure is installed on the sealing seat and connected to the sealing seat. Then, the position of the three correction blocks is adjusted by the adjustment assembly. The three correction blocks correct the sample vertically, and then Then slide the main shaft, the main shaft and the cap are abutted away from the top of the sample, and then connect the main shaft and the force measuring mechanism, and then inject water. During the water injection process, the adjustment component is used to adjust the correction block to separate from the sample. After filling with water, start the test. During the experiment, the water pressure, vertical pressure and pore pressure are obtained through the force measuring mechanism; through the setting of the correction mechanism, it is convenient to adjust the vertical state of the sample, facilitate the data measured by the force measuring mechanism during the test, and facilitate the complete application of the pressure applied by the bottom plate to the sample, thereby further ensuring the accuracy of the test results and reducing the impact on the real results.

[0008] Optionally, a soft glue layer is formed on a side of the calibration block close to the sample.

[0009] By adopting the above technical solution, when the correction block applies force to the sample for correction, the set soft rubber layer contacts the rubber sleeve on the outside of the sample until the correction blocks on three sides abut the sample, so that the sample remains vertical, and then the test is carried out. Through the set soft rubber layer, the damage of the correction block to the sample and the rubber sleeve can be reduced, the test variables can be reduced, the test structure can be made to be realistic, and it helps to reduce the impact on the test results.

[0010] Optionally, the adjustment assembly includes a telescopic rod, an adjustment rod, a connecting ring, a transmission member and a sealing member, the telescopic rod is connected to the correction block correspondingly and fixed on the cover; the adjustment rod is slidably set on the cover through the sealing member, the adjustment rod is set correspondingly to the correction block and connected to the adjustment rod through the transmission member, and the adjustment rod slides upward to drive the correction block to move closer to or away from the sample; the connecting ring connects multiple adjustment rods into a whole.

[0011] By adopting the above technical solution, after the sample is placed on the base plate, the enclosure is connected to the sealing seat, and then the connecting ring is slid, the connecting ring drives the adjusting rod to slide, the adjusting rod drives the telescopic rod to extend and retract, so that the correction block is close to the sample, and the three correction blocks straighten the sample, and then the main shaft is abutted against the upper end of the cap and connected to the force measuring mechanism, and then water is injected, and during the water injection process, the connecting ring is moved again, so that the connecting ring drives the adjusting rod to move in the opposite direction, the adjusting rod drives the telescopic rod to retract, so that the correction block leaves the sample, and then the test is carried out after the water is filled; the set adjustment component has a simple structure and is easy to operate, and can ensure the sealing of the enclosure and at the same time, which is convenient for reducing test variables and maintaining test accuracy.

[0012] Optionally, the connecting member includes a connecting shaft, the connecting shaft is arranged at the sliding end of the telescopic rod, the adjusting rod is provided with an adjusting slot, the adjusting slot is inclined and one end of the adjusting slot is close to or away from the inner wall of the enclosure, and the connecting shaft slides in the adjusting slot.

[0013] By adopting the above technical solution, after the sample is placed on the bottom plate, the enclosure is connected to the sealing seat, and then the connecting ring is slid, the connecting ring drives the adjusting rod to slide, the adjusting rod drives the connecting shaft to slide by changing the position of the adjusting groove, the connecting shaft drives the telescopic rod to extend and retract, so that the correction block is close to the sample, the three correction blocks straighten the sample, and then the main shaft is abutted against the upper end of the cap and connected to the force measuring mechanism, and then water is injected, and during the water injection process, the connecting ring is moved again, so that the connecting ring drives the adjusting rod to move in the opposite direction, the adjusting rod drives the telescopic rod to retract, so that the correction block leaves the sample, and then the test is carried out after the water is filled; the set connecting piece has a simple structure and good stability, and will not rust or jam, so that the correction effect can be maintained.

[0014] Optionally, the sealing member includes a sealing ring, an elastic pressure ring and a sealing bolt, the sealing ring is sleeved on the adjusting rod and embedded in the enclosure, the elastic pressure ring abuts against the sealing ring and is used to compress the sealing ring, the sealing bolt is threadedly connected to the enclosure and is slidably connected to the adjusting rod, the sealing bolt abuts against the elastic pressure ring and drives the elastic pressure ring to squeeze the sealing ring.

[0015] By adopting the above technical scheme, when adjusting the adjustment rod, the sealing bolt can be loosened to reduce the squeezing of the sealing ring by the elastic pressure ring, which is convenient for the sliding of the adjustment rod. At the same time, after the sample is corrected to be vertical, the adjustment rod is withdrawn, and then the sealing bolt is tightened to make the seal between the adjustment rod and the cover, and then water is injected to carry out the test; the set sealing member has a simple structure and is easy to operate and control, and when the sealing performance of the sealing ring deteriorates, the sealing performance can be maintained by the sealing bolt, and during the calibration process, the sliding of the adjustment rod can be facilitated by loosening the sealing bolt, making the calibration process simple and convenient.

[0016] Optionally, the correction blocks may be arranged in two groups along the vertical direction.

[0017] By adopting the above technical solution and setting two groups of correction blocks, the straightening effect of the sample can be improved, the test error caused by the misalignment of the sample can be further reduced, and the accuracy of the test result can be improved.

[0018] Optionally, a seepage hole is provided at the fixed end of the telescopic rod.

[0019] By adopting the above technical solution, when water is injected, the seepage holes facilitate water infiltration, reducing the influence of the generation of voids on the test results, so that the accuracy of the test results can be maintained.

[0020] Optionally, a suspension assembly is provided on the enclosure, and the suspension assembly includes a top rod and a suspension hook, the top rod is provided on the enclosure, and the suspension hook is detachably connected to the connecting ring.

[0021] By adopting the above technical solution, when installing the enclosure, in order to reduce the collision of the calibration block with the sample, the calibration block can be connected to the connecting ring through a hanging hook so that the calibration block is located at one end close to the inner wall of the enclosure, and then the enclosure can be installed; by setting the suspension component, the damage to the sample is reduced, making the test result more accurate.

[0022] Optionally, a weight sensor is provided on the enclosure, and the weight sensor is connected to the connecting ring.

[0023] By adopting the above technical solution and setting the weight sensor, the contact time between the calibration block and the sample can be intuitively observed, which is convenient for determining the calibration state of the sample and reducing damage to the sample caused by excessive force, thereby maintaining the accuracy of the test results.

[0024] In summary, this application includes the following beneficial technical effects: 1. When testing soil samples, paste the soaked water filter strips on the side walls of the samples, and paste filter papers on both ends. Then place permeable stones on both ends of the samples, and put rubber sleeves on the outside of the samples. Then vent the bottom plate until the water overflows. Then place the sample on the bottom plate, and put the rubber sleeve on the bottom plate. Then place the cap on the permeable stone at the upper end of the sample, and put the rubber sleeve on the cap. Then install the enclosure on the sealing seat and connect it to the sealing seat. Then use the adjustment assembly to adjust the position of the three correction blocks. The three correction blocks correct the sample vertically, and then slide the main The main shaft and the cap are abutted away from the top of the sample, and then the main shaft and the force measuring mechanism are connected, and then water is injected. During the water injection process, the adjustment component is used to adjust the calibration block to separate from the sample. After the water is filled, the test is started. During the experiment, the water pressure, vertical pressure and pore pressure are obtained through the force measuring mechanism; through the setting of the correction mechanism, it is convenient to adjust the vertical state of the sample, facilitate the data measured by the force measuring mechanism during the test, and facilitate the complete application of the pressure applied by the bottom plate to the sample, thereby further ensuring the accuracy of the test results and reducing the impact on the real results; 2. After placing the sample on the bottom plate, connect the enclosure with the sealing seat, and then slide the connecting ring, which drives the adjusting rod to slide. The adjusting rod drives the connecting shaft to slide by changing the position of the adjusting groove, and the connecting shaft drives the telescopic rod to extend and retract, so that the calibration block is close to the sample. The three calibration blocks straighten the sample, and then the main shaft is abutted against the upper end of the cap and connected to the force measuring mechanism, and then water is injected. During the water injection process, move the connecting ring again, so that the connecting ring drives the adjusting rod to move in the opposite direction, and the adjusting rod drives the telescopic rod to retract, so that the calibration block leaves the sample, and then the test is carried out after the water is filled; the set connecting piece has a simple structure and good stability, and will not rust or jam, so that the calibration effect can be maintained; 3. The setting of the weight sensor can intuitively observe the contact time between the calibration block and the sample, which is convenient for determining the calibration state of the sample and reducing damage to the sample caused by excessive force, thereby maintaining the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the triaxial apparatus in the embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the force measuring mechanism in the embodiment of the present application; Figure 3 This is an exploded view of the sealing seat in the embodiment of the present application; Figure 4 This is a schematic diagram of the structure of the connection assembly in the embodiment of the present application; Figure 5 It is a cross-sectional schematic diagram of an adjustment component in an embodiment of the present application; Figure 6It is a cross-sectional view of the adjustment rod in the embodiment of the present application.

[0026] Figure numerals: 100, base; 200, lifting mechanism; 210, sealing seat; 211, fixing ring; 212, rotating ring; 213, drainage hole; 214, connecting hole; 215, confining pressure sealing groove; 216, limiting groove; 220, bottom plate; 221, water injection hole; 230, lifting assembly; 240, sealing shaft; 300, confining pressure mechanism; 310, enclosure; 320, exhaust member; 330, cover cap; 331, back pressure hole; 340, main shaft; 350, connecting assembly; 351, limiting ring; 352, stop ring; 353, clearance hole; 400, dynamometer Structure; 410, confining pressure sensor; 420, force sensor; 430, back pressure sensor; 440, pore pressure sensor; 500, correction mechanism; 510, correction block; 520, adjustment assembly; 521, telescopic rod; 522, adjustment rod; 523, connecting ring; 524, transmission member; 525, sealing ring; 526, elastic pressure ring; 527, sealing bolt; 528, fixing rod; 529, sliding rod; 531, snap-in groove; 532, adjustment groove; 533, sliding hole; 534, guide hole; 600, suspension assembly; 610, push rod; 620, suspension hook. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-Figure 6 This application is described in further detail.

[0028] The embodiment of the present application discloses a triaxial apparatus.

[0029] refer to Figure 1 The triaxial apparatus comprises a base 100 placed on the test bench, a lifting mechanism 200 arranged on the base 100, a confining pressure mechanism 300 arranged on the lifting mechanism 200, and a correction mechanism 500 arranged on the confining pressure mechanism 300 for straightening the sample, wherein the lifting mechanism 200 is used for placing the sample and applying vertical pressure to the sample; when conducting the test, the sample is first placed on the lifting mechanism 200, and then the confining pressure mechanism 300 is installed on the lifting mechanism 200, and then the correction mechanism 500 is used to straighten the sample, and then water is injected, and then the correction mechanism 500 is released from the intervention of the sample to conduct the test.

[0030] refer to Figure 2 and Figure 3The lifting mechanism 200 includes a sealing seat 210 arranged on the base 100, and the sealing seat 210 includes a fixed ring 211 and a rotating ring 212. The fixed ring 211 is fixedly connected to the base 100, and the rotating ring 212 is rotatably connected to the fixed ring 211. The rotating ring 212 is provided with a connecting assembly 350; a sealing shaft 240 is sealingly and slidingly connected to the fixed ring 211, and a bottom plate 220 is fixedly connected to the sealing shaft 240. A water injection hole 221 is opened on the bottom plate 220, and the water injection hole 221 is located in the middle of the bottom plate 220, and the bottom plate 220 is in the shape of a circular plate. The force measuring mechanism 400 includes The pore pressure sensor 440 is fixedly connected to the fixing ring 211 and communicated with the water injection hole 221; a lifting assembly 230 is arranged in the fixing ring 211, and the lifting assembly 230 is a lifting cylinder, and the piston rod of the lifting cylinder is fixedly connected to the bottom plate 220; a drainage hole 213 and a connecting hole 214 are opened on the fixing ring 211, and the drainage hole 213 is externally connected to the drainage equipment, and the force measuring mechanism 400 includes a confining pressure sensor 410 connected between the drainage hole 213 and the drainage equipment, and the connecting hole 214 is connected to a first hose and is connected to the confining pressure mechanism 300.

[0031] In other embodiments, the base 100 can be slid on the test bench in a vertical direction by a lifting cylinder.

[0032] refer to Figure 3 and Figure 4The confining and pressing mechanism 300 includes a cover 310, which is detachably connected to the rotating ring 212 through a connecting assembly 350. The cover 310 is cylindrical with a central hole, and one end away from the fixed ring 211 is closed, and the cover 310 is slidably and sealingly connected to a main shaft 340 away from the fixed ring 211, and the main shaft 340 is concentric with the bottom plate 220; and an exhaust member 320 is fixedly connected to the cover 310, and the exhaust member 320 can be a sealing valve or an exhaust bolt with a sealing member. The embodiment is preferably The connecting assembly 350 includes a stop ring 351 fixedly connected to the rotating ring 212, and an inclined stop groove 216 is formed on the side wall of the stop ring 351 close to the fixed ring 211, and the cross-sectional area of ​​the stop groove 216 gradually decreases with the clockwise rotation direction; three clearance holes 353 are opened on the stop ring 351, and the clearance holes 353 are connected to the limit groove 216, and three stop rings 352 are fixedly connected to the enclosure 310, and the stop rings 352 can slide into the clearance holes 353 The limiting groove 216 is provided in the upper and lower parts of the cover 310, and as the rotating ring 212 rotates, the limiting groove 216 drives the stop ring 352 to press against the fixed ring 211. The fixed ring 211 is provided with a confining pressure sealing groove 215. A sealing O-ring is placed in the confining pressure sealing groove 215. The cover 310 can press against the sealing O-ring. The confining pressure mechanism 300 also includes a cap 330. A back pressure hole 331 is provided in the middle of the cap 330. The back pressure hole 331 corresponds to the water injection hole 221 on the bottom plate 220, and is connected to the connecting hole 221 through a first hose. 14 connected; when conducting the test, a water-soaked filter strip is pasted on the side wall of the sample, and filter paper is pasted on both ends. Then, permeable stones are placed on both ends of the sample, and a rubber sleeve is put on the outside of the sample. Then, the bottom plate 220 is vented until the water overflows. Then, the sample is placed on the bottom plate 220, and the rubber sleeve is put on the bottom plate 220. Then, the cap 330 is placed on the permeable stone at the upper end of the sample, and the rubber sleeve is put on the cap 330. Then, the enclosure 310 is fixed by rotating the rotating ring 212.

[0033] The force measuring mechanism 400 further includes a back pressure sensor 430 , which is disposed on the fixing ring 211 and communicated with the back pressure hole 331 . The main shaft 340 is connected with a force measuring sensor 420 , ie, an axial pressure sensor.

[0034] refer to Figure 5 and Figure 6The correction mechanism 500 includes an adjustment component 520, which includes at least three telescopic rods 521 arranged on the inner wall of the enclosure 310. The three telescopic rods 521 are arranged at equal intervals along the circumference of the enclosure 310. The end of the telescopic rod 521 connected to the enclosure 310 is a fixed end, and the telescopic rod 521 includes a fixed rod 528 and a sliding rod 529. The fixed rod 528 is fixed on the sliding rod 529, and a sliding hole 533 is provided at the end away from the enclosure 310. The sliding rod 529 is slidably connected in the sliding hole 533; a guide hole 534 is provided on the outer wall of the fixed rod 528, the guide hole 534 is connected to the sliding hole 533 and is provided along the length direction of the fixed rod 528, and a guide rod is slidably connected in the guide hole 534, and the guide rod is connected to the sliding rod 529; a plurality of seepage holes are provided on the fixed rod 528, and the seepage holes are connected to the sliding hole 533; The end of the movable rod 529 away from the fixed rod 528 is fixedly connected to the correction block 510, and the correction block 510 is provided with an arc surface on the side away from the fixed rod 528, and a soft rubber layer is formed on the arc surface; three sliding holes are provided on the cover 310, and the adjustment rod 522 is slidably connected in the sliding holes. The end of the adjustment rod 522 close to the sliding rod 529 is formed with a clamping groove 531, which is sleeved on the fixed rod 528 and is provided with a transmission member 524, and is connected to the sliding rod 529 through the transmission member 524, and the transmission member 524 is a connecting shaft fixedly connected to the guide rod; an adjusting groove 532 is provided on the inner wall of the clamping groove 531, and the adjusting groove 532 is inclined, and the end close to the fixed ring 211 is inclined toward the direction close to the inner wall of the cover 310, the connecting shaft slides in the adjusting groove 532, and as the adjusting rod 522 is pressed down, the sliding rod 529 is driven to approach the sample.

[0035] The three adjusting rods 522 are fixedly connected to a connecting ring 523 at one end away from the sliding rod 529; a water stop groove is provided on the upper end surface of the enclosure 310, and the water stop groove is connected to the sliding hole; a sealing member is provided on the enclosure 310, and the sealing member includes a sealing ring 525 placed in the water stop groove, and the sealing ring 525 is sleeved on the adjusting rod 522; an elastic pressure ring 526 is fixedly bonded in the water stop groove, and the elastic pressure ring 526 is used to limit the sealing ring 525 from sliding off as the adjusting rod 522 slides, and the elastic pressure ring 526 has elasticity that can squeeze the sealing ring 525; a sealing bolt 527 is threadedly connected to the enclosure 310, and a through hole is provided in the middle of the sealing bolt 527, and the adjusting rod 522 passes through the through hole, and the sealing bolt 527 abuts against the elastic pressure ring 526 as it is tightened and drives the elastic pressure ring 526 to squeeze the sealing ring 525.

[0036] In other embodiments, two groups of correction blocks 510 may be provided, and the two groups of correction blocks 510 are arranged in a vertical direction to facilitate the straightening of the sample and improve the straightening effect.

[0037] A weight sensor is also provided between the connecting ring 523 and the enclosure 310, and is used to detect the pressure of the connecting ring 523 in a free state. The connecting ring 523 can have its own counterweight, so that the connecting ring 523 can drive the adjusting rod 522 to fall freely and complete the straightening of the sample.

[0038] A suspension assembly 600 is provided on the enclosure 310, and the suspension assembly 600 includes a top rod 610 slidably connected to the upper end surface of the enclosure 310, the top rod 610 can be close to the main shaft 340, and a suspension hook 620 is fixedly connected to the top rod 610, and the suspension hook 620 can be detachably connected to the connecting ring 523. In this embodiment, the suspension hook 620 is preferably connected in abutment with the enclosure 310, that is, the suspension hook 620 abuts against the connecting ring 523 near the side wall of the enclosure 310 for supporting the connecting ring 523.

[0039] The implementation principle of a triaxial instrument in an embodiment of the present application is as follows: when conducting a test, take out the sample, then take out the outer mold, paste the water-soaked filter strip on the side wall of the sample, paste filter paper on both ends, then place permeable stones on both ends of the sample, and use the test tool to put a rubber sleeve on the outside of the sample, then vent the bottom plate 220 until the water overflows, then place the sample on the bottom plate 220, and put the rubber sleeve on the bottom plate 220, then place the cap 330 on the permeable stone at the upper end of the sample, and put the rubber sleeve on the cap 330, then rotate the rotating ring 212, the rotating ring 212 drives the limiting groove 216 to rotate, so that the limiting groove 216 presses the stop ring 352 against the fixing ring 211, and the cover 310 presses against the sealing O-ring; then loosen the three sealing bolts 527, slide the push rod 610, and the push rod 610 drives the suspension hook 620 and the connecting ring 523 Separation, the connecting ring 523 falls freely, the connecting ring 523 drives the adjusting rod 522 to slide, the adjusting rod 522 moves down and drives the connecting shaft to slide in the adjusting groove 532, so that the connecting shaft drives the sliding rod 529 to approach the sample, and the sliding rod 529 drives the correction block 510 to approach the sample and abut against the sample. At this time, the pressure of the force sensor 420 changes, and then the sliding main shaft 340 abuts against the cap 330, connects the main shaft 340 and the axial pressure sensor, and then injects water. When injecting water, pull up the connecting ring 523, the connecting ring 523 drives the adjusting rod 522 to slide in the opposite direction, and the adjusting rod 522 drives the sliding rod 529 to slide in the opposite direction, so that the correction block 510 is separated from the sample; after the water overflows the exhaust part 320, tighten the sealing bolt 527, and then continue to inject water, and after the water overflows again, close the exhaust part 320; then conduct the test and record various test data.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A triaxial apparatus, characterized in that: The invention comprises a base (100), a lifting mechanism (200), a confining pressure mechanism (300), a force measuring mechanism (400) and a calibration mechanism (500). The lifting mechanism (200) comprises a sealing seat (210), a bottom plate (220) and a lifting assembly (230). The sealing seat (210) is arranged on the base (100). The bottom plate (220) is concentrically slidably connected to the sealing seat (210) via the lifting assembly (230). A water injection hole (221) is provided on the bottom plate (220) and is used to place a sample. The confining pressure mechanism (300) comprises a hood (310), an exhaust member (320), a cap (330) and a main shaft (340). The hood (310) is detachably and hermetically connected to the sealing seat (210). The exhaust member (320) is arranged above the hood (310) and is used to exhaust gas when water is injected. The cap (330) is placed above the sample, the main shaft (340) is sealingly slid on the upper end surface of the enclosure (310), abuts against the cap (330) and is connected to the force measuring mechanism (400), and the force measuring mechanism (400) is also connected to the water injection hole (221) of the bottom plate (220); the correction mechanism (500) includes a correction block (510) and an adjustment component (520), at least three correction blocks (510) are slid on the enclosure (310), the three correction blocks (510) are arranged at equal intervals along the circumference of the enclosure (310), and the correction blocks (510) are abutted against the side wall of the test circumference for straightening the sample; the adjustment component (520) is arranged on the enclosure (310) and is sealingly connected to the enclosure (310), and the adjustment component (520) is used to synchronously adjust the positions of multiple correction blocks (510).

2. The triaxial apparatus according to claim 1, characterized in that: A soft rubber layer is formed on one side of the calibration block (510) close to the sample.

3. The triaxial apparatus according to claim 1, characterized in that: The adjustment assembly (520) comprises a telescopic rod (521), an adjustment rod (522), a connecting ring (523), a transmission member (524) and a sealing member. The telescopic rod (521) is connected to the calibration block (510) and fixed to the enclosure (310). The adjustment rod (522) is slidably arranged on the enclosure (310) via the sealing member. The adjustment rod (522) is arranged to correspond to the calibration block (510) and is connected to the adjustment rod (522) via the transmission member (524). The adjustment rod (522) moves upward and slides to drive the calibration block (510) to approach or move away from a sample. The connecting ring (523) connects a plurality of the adjustment rods (522) into a whole.

4. The triaxial apparatus according to claim 3, characterized in that: The transmission member (524) comprises a connecting shaft, the connecting shaft being arranged at the sliding end of the telescopic rod (521), the adjusting rod (522) being provided with an adjusting slot (532), the adjusting slot (532) being inclined and having one end close to or away from the inner wall of the enclosure (310), and the connecting shaft slidingly moving in the adjusting slot (532).

5. The triaxial apparatus according to claim 3, characterized in that: The sealing component comprises a sealing ring (525), an elastic pressure ring (526) and a sealing bolt (527); the sealing ring (525) is sleeved on the adjusting rod (522) and embedded in the enclosure (310); the elastic pressure ring (526) abuts against the sealing ring (525) and is used to compress the sealing ring (525); the sealing bolt (527) is threadedly connected to the enclosure (310) and is slidably connected to the adjusting rod (522); the sealing bolt (527) abuts against the elastic pressure ring (526) and drives the elastic pressure ring (526) to squeeze the sealing ring (525).

6. The triaxial apparatus according to claim 1, characterized in that: The correction blocks (510) may be arranged in two groups along the vertical direction.

7. The triaxial apparatus according to claim 3, characterized in that: A seepage hole is provided at the fixed end of the telescopic rod (521).

8. The triaxial apparatus according to claim 3, characterized in that: A suspension assembly (600) is arranged on the enclosure (310), and the suspension assembly (600) comprises a top rod (610) and a suspension hook (620). The top rod (610) is arranged on the enclosure (310), and the suspension hook (620) is detachably connected to the connection ring (523).

9. The triaxial apparatus according to claim 3, characterized in that: A weight sensor is provided on the enclosure (310), and the weight sensor is connected to the connecting ring (523).

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