CN111982779A - Test method for simulating seepage deformation of pressure tunnel by hollow cylindrical rock sample - Google Patents
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- 239000011435 rock Substances 0.000 title claims abstract description 44
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 230000003204 osmotic effect Effects 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000013459 approach Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 10
- 230000007774 longterm Effects 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a test method for simulating seepage deformation of a pressure tunnel by using a hollow cylindrical rock sample, which comprises the following steps of: obtaining a rock core from the complete rock block and processing the rock core to obtain a rock standard sample; performing a creep mechanical test on the rock standard sample to obtain confining pressure at each level and a corresponding steady-state hoop strain rate value; drawing a steady-state circumferential strain rate-stress level relation curve and a steady-state circumferential strain rate-osmotic pressure level relation curve according to the osmotic pressure change value, the confining pressure of each stage and the steady-state circumferential strain rate value of each stage; and acquiring the deformation seepage relation of the tunnel under the pressurized condition according to the steady state circumferential strain rate-stress level relation curve and the steady state circumferential strain rate-seepage level relation curve. The method is simple and effective, realizes the pressure simulation condition of the local tunnel by using the hollow cylindrical sample, and can provide reference for engineering construction and long-term operation.
Description
Technical Field
The invention relates to the technical field of rock mechanics and engineering, in particular to a test method for simulating seepage deformation of a pressure tunnel by using a hollow cylindrical rock sample.
Background
With the rapid development of underground engineering construction such as tunnel construction, mine construction and the like in China, the safety and stability of the underground engineering construction are more and more widely regarded. Uncertain factors in the construction process seriously affect the construction safety, the tunnel deformation can be greatly influenced by the engineering disturbance and load application on the upper part of the tunnel, and the change condition of the deformation seepage under the local compression of the tunnel is difficult to measure, thus the engineering safety is damaged.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a test method for simulating seepage deformation of a pressure tunnel by using a hollow cylindrical rock sample, so as to solve the problem that the change condition of the deformation seepage is difficult to measure in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a test method for simulating seepage deformation of a pressure tunnel by using a hollow cylindrical rock sample comprises the following steps:
obtaining a rock core from the complete rock block and processing the rock core to obtain a rock standard sample;
performing a creep mechanical test on the rock standard sample to obtain confining pressure at each level and a corresponding steady-state hoop strain rate value;
drawing a steady-state circumferential strain rate-stress level relation curve and a steady-state circumferential strain rate-osmotic pressure level relation curve according to the osmotic pressure change value, the confining pressure of each stage and the steady-state circumferential strain rate value of each stage;
and acquiring the deformation seepage relation of the tunnel under the pressurized condition according to the steady state circumferential strain rate-stress level relation curve and the steady state circumferential strain rate-seepage level relation curve.
Further, the rock standard sample is in a hollow cylindrical shape; the standard rock sample has the dimensions of 25mm inner diameter, 50mm outer diameter and 100mm height.
Further, the creep mechanical test is carried out by a full-automatic triaxial rheological servo instrument.
Furthermore, the confining pressure of the creep mechanical test is formed in a graded loading mode under constant low axial pressure.
Further, the hierarchical loading mode is as follows:
the constant low axial pressure in the grading loading process is used for simulating low lateral stress of a tunnel in the horizontal direction, and meanwhile, the low axial pressure loading slightly larger than the osmotic pressure is combined with the impermeable material coated on the inner wall of the rock sample, so that the lateral seepage of water in the rock sample can be controlled to a certain degree, and the vertical seepage of the water in the rock sample is ensured; the creep limit stress is 20-30% of the instantaneous peak intensity, and the applied first-stage stress is 5-10% of the instantaneous peak intensity; in the multi-stage step-by-step loading process, increasing each stage of stress increment step by step until the stress load reaches or approaches creep limit stress, and then reducing each stage of stress increment step by step; the application amount of each stage of stress increment is 0.1cm3/min。
Further, the method for drawing the relation curve of the steady-state hoop strain rate and the stress level comprises the following steps: drawing the confining pressure values of all levels on a plane rectangular coordinate system by taking the confining pressure values of all levels as horizontal coordinates and taking the steady-state hoop strain rate values of all levels as vertical coordinates; and fitting the data drawn on the plane rectangular coordinate system by using the function to obtain a steady-state circumferential strain rate-stress level relation curve.
Further, the method for drawing the relation curve of the steady-state hoop strain rate and the osmotic pressure level comprises the following steps; drawing the osmotic pressure change value as a horizontal coordinate and the steady-state hoop strain rate values of all levels as a vertical coordinate on a plane rectangular coordinate system; and fitting the data drawn on the plane rectangular coordinate system by using the function to obtain a steady-state circumferential strain rate-osmotic pressure level relation curve.
Compared with the prior art, the invention has the beneficial effects that:
according to the method, the deformation and seepage relation under the condition of the tunnel compression is obtained by utilizing the steady-state circumferential strain rate-stress level relation curve and the steady-state circumferential strain rate-seepage level relation curve, and the change condition of the deformation and seepage under the condition of the local tunnel compression is simply and effectively simulated through a test; the deformation change quantity of the tunnel under long-term ground pressure load is effectively simulated by graded loading confining pressure.
Drawings
FIG. 1 is a schematic view of a hollow cylindrical sample using the method of the present invention;
FIG. 2 is a schematic view of loading of a hollow cylindrical sample using the method of the present invention;
FIG. 3 is a schematic view of a hollow cylindrical sample pressure chamber using the method of the present invention.
Reference numerals: 1-outer strain gage; 2-an upper pressure head; 3-a water permeable layer; 4-thermal shrinkage plastic sleeve; 5-inner strain gage; 6-impermeable material; 7-impermeable layer; 8-axial pressure pump; 9-enclosing and pressing pump; 10-an upper drainage device; 11-lower drainage device.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples.
A test method for simulating seepage deformation of a pressure tunnel by using a hollow cylindrical rock sample comprises the following steps: obtaining a rock core from the complete rock block and processing the rock core to obtain a rock standard sample;
performing a creep mechanical test on the rock standard sample to obtain confining pressure at each level and a corresponding steady-state hoop strain rate value;
drawing a steady-state circumferential strain rate-stress level relation curve and a steady-state circumferential strain rate-osmotic pressure level relation curve according to the osmotic pressure change value, the confining pressure of each stage and the steady-state circumferential strain rate value of each stage;
and acquiring the deformation seepage relation of the tunnel under the pressurized condition according to the steady state circumferential strain rate-stress level relation curve and the steady state circumferential strain rate-seepage level relation curve.
The method comprises the following steps:
1) manufacturing a sample;
selecting a complete and defect-free sandstone block, drilling a core by using a core drilling machine, and processing the core to prepare a hollow cylindrical rock standard sample with the inner diameter of 25mm, the outer diameter of 50mm and the height of 100 mm.
2) Conventional triaxial mechanical tests;
performing a creep mechanical test on a standard sample of the hollow cylindrical rock under confining pressure graded loading by a full-automatic triaxial rheological servo instrument in a confining pressure multistage step-by-step loading mode under a constant low axial pressure condition to obtain a creep test result; and the creep test result comprises confining pressure values of all stages and steady-state hoop strain rate values of all stages.
3) Drawing a steady-state circumferential strain rate-stress level relation curve according to a creep mechanical test result;
drawing the confining pressure stress values of all levels on a plane rectangular coordinate system by taking the confining pressure stress values of all levels as horizontal coordinates and taking the steady-state hoop strain values of all levels as vertical coordinates; and fitting the data by using an exponential function and a power function respectively, and selecting a fitting curve obtained by fitting the exponential function with a higher fitting correlation coefficient as a steady-state circumferential strain rate-stress level relation curve, wherein the fitting correlation coefficient is an index reflecting the closeness degree of the fitting result and the correlation relation of the original data, and if the correlation coefficient is higher, the data points are more in line with the trend of the function.
4) Determining a relation curve of steady-state annular strain rate-osmotic pressure level;
drawing the osmotic pressure change value as a horizontal coordinate and the steady-state hoop strain rate values of all levels as a vertical coordinate on a plane rectangular coordinate system; fitting the data by using a function to obtain a steady-state circumferential strain rate-osmotic pressure level relation curve; the design that the inner side of the rock sample is coated with a waterproof material, a waterproof layer is slightly larger than the inner diameter of the rock sample, and the constant low axial pressure loading which is slightly larger than the osmotic pressure is adopted to limit the lateral seepage effectively simulates the condition that the inside of the tunnel is free of the osmotic pressure.
The situation of the tunnel under the long-term loading condition is simulated through confining pressure graded loading; the confining pressure stress increment in the test is determined according to the results of the conventional instantaneous triaxial compression test, the creep limit stress is determined to be 20-30% of the instantaneous peak intensity, and the applied first-stage stress is 5-10% of the instantaneous peak intensity; in the process of multi-stage gradual loading, increasing each stage stress increment step by step, and when the stress load reaches or approaches to the determined creep limit stress, reducing step by stepEach stage of stress increment; the application mode of each stage of stress increment adopts 0.1cm3/min。
According to the invention, through carrying out simulation test on the pressurized tunnel, the relation of deformation seepage under the pressurized condition of the tunnel is obtained on the simple and effective premise, so that the risk in the construction process can be reduced, and a certain guiding effect on tunnel construction is achieved.
As shown in figures 1, 2 and 3, the invention carries out constant low axial pressure loading through an axial pressure pump 8 under the condition of an indoor triaxial test, carries out confining pressure graded loading through a confining pressure pump 9, simulates the condition that a tunnel is compressed to a steady state creep, obtains lateral deformation data through a sample surface strain gauge 1, obtains inner wall deformation data through a strain gauge 5 arranged at the inner side of a sample, permeates through a permeable layer 3, obtains osmotic pressure change data through upper and lower drainage devices 10 and 11, adopts the design of a impermeable layer 7 with the diameter slightly larger than the inner diameter of the sample and an impermeable material 6 to ensure that the osmotic pressure in a cavity is approximately zero, simulates the internal environment of the tunnel, and realizes the deformation and osmotic flow change trend of the pressure tunnel along with the pressure change. The method is simple and effective, realizes the pressure simulation condition of the local tunnel by using the hollow cylindrical sample, and can provide reference for engineering construction and long-term operation.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A test method for simulating seepage deformation of a pressure tunnel by using a hollow cylindrical rock sample is characterized by comprising the following steps:
obtaining a rock core from the complete rock block and processing the rock core to obtain a rock standard sample;
performing a creep mechanical test on the rock standard sample to obtain confining pressure at each level and a corresponding steady-state hoop strain rate value;
drawing a steady-state circumferential strain rate-stress level relation curve and a steady-state circumferential strain rate-osmotic pressure level relation curve according to the osmotic pressure change value, the confining pressure of each stage and the steady-state circumferential strain rate value of each stage;
and acquiring the deformation seepage relation of the tunnel under the pressurized condition according to the steady state circumferential strain rate-stress level relation curve and the steady state circumferential strain rate-seepage level relation curve.
2. The test method for simulating the seepage deformation of the pressure tunnel by the hollow cylindrical rock sample according to claim 1, wherein the rock standard sample is in a hollow cylindrical shape; the standard rock sample has the dimensions of 25mm inner diameter, 50mm outer diameter and 100mm height.
3. The method for testing the hollow cylindrical rock sample by simulating the seepage deformation of the pressure tunnel according to claim 1, wherein the creep mechanical test is performed by a fully-automatic triaxial rheological servo instrument.
4. The method for testing the seepage deformation of the hollow cylindrical rock sample simulating the pressure tunnel according to claim 1, wherein the confining pressure of the creep mechanical test is formed by means of graded loading under constant low axial pressure.
5. The test method for simulating the seepage deformation of the pressure tunnel by the hollow cylindrical rock sample according to claim 4, wherein the graded loading mode is as follows:
the constant low axial pressure in the grading loading process is greater than the test osmotic pressure; the creep limit stress is 20-30% of the instantaneous peak intensity, and the applied first-stage stress is 5-10% of the instantaneous peak intensity; in the multi-stage step-by-step loading process, increasing each stage of stress increment step by step until the stress load reaches or approaches creep limit stress, and then reducing each stage of stress increment step by step; application of stress increments per stageThe amount was 0.1cm3/min。
6. The test method for simulating the seepage deformation of the pressure tunnel according to the claim 1, wherein the method for drawing the relation curve of the steady-state hoop strain rate and the stress level comprises the following steps: drawing the confining pressure values of all levels on a plane rectangular coordinate system by taking the confining pressure values of all levels as horizontal coordinates and taking the steady-state hoop strain rate values of all levels as vertical coordinates; and fitting the data drawn on the plane rectangular coordinate system by using the function to obtain a steady-state circumferential strain rate-stress level relation curve.
7. The test method for simulating the seepage deformation of the pressure tunnel according to the claim 1, wherein the method for drawing the relation curve of the steady-state hoop strain rate and the seepage level comprises the following steps: drawing the osmotic pressure change value as a horizontal coordinate and the steady-state hoop strain rate values of all levels as a vertical coordinate on a plane rectangular coordinate system; and fitting the data drawn on the plane rectangular coordinate system by using the function to obtain a steady-state circumferential strain rate-osmotic pressure level relation curve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112964623A (en) * | 2021-03-23 | 2021-06-15 | 哈尔滨工业大学 | Experimental device for axial permeation of annular tissue engineering scaffold and use method |
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