CN102183622B - Novel unsaturated soil high-pressure consolidation test device - Google Patents
Novel unsaturated soil high-pressure consolidation test device Download PDFInfo
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- CN102183622B CN102183622B CN 201110030140 CN201110030140A CN102183622B CN 102183622 B CN102183622 B CN 102183622B CN 201110030140 CN201110030140 CN 201110030140 CN 201110030140 A CN201110030140 A CN 201110030140A CN 102183622 B CN102183622 B CN 102183622B
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Abstract
The invention provides a novel unsaturated soil high-pressure consolidation test device. The novel unsaturated soil high-pressure consolidation test device is characterized by mainly comprising a vertical pressurizing shaft 1, a pressure chamber 2, a vertical pressure sensor 3, a vertical displacement sensor 8, a pore space water pressure sensor 9, a consolidation pressure box 10, a pressure chamber pedestal 11, a pore space air pipeline 12, a first pore space water pipeline 13, a second pore space water pipeline 14, a rolling membrane 15, an instrument pedestal 16, a piston 17, a force transmission shaft 18, a water inlet pipeline 19, a vent hole valve 22, a first fixed bolt 23 and a second fixed bolt 24. The novel unsaturated soil high-pressure consolidation test device is easy to manufacture, has high measuring precision, meets unsaturated soil three-way pressure testing requirements, can measure and control the unsaturated soil high-pressure consolidation test under the condition of an attractive force, and is applicable to measuring consolidation coefficients and compression laws of various kinds of soil in the unsaturated state in civil engineering.
Description
Technical field
The present invention is a kind of geotechnological testing tool, belongs to civil engineering work instrument test field.
Background technology
Unsaturated soil is widely distributed in China, the crude sedimentation soil that earth surface extensively distributes, and the soil body problem that runs in the engineering construction, it nearly all is the unsaturated soil problem, saturated soil is truly seldom seen in engineering practice, and this makes the research of unsaturated soil mechanics have very real and practical meaning.Loading will produce super pore air pressure and pore water pressure to the unsaturation sample, pore water pressure can increase in time and dissipate, finally get back to loading numerical value in the past, the evanishment of pore pressure is called fixed, and this process will cause reducing of volume or sedimentation.The saturated soil consolidation test is relatively ripe, can be used for research saturated soil consolidation theory.The unsaturated soil consolidation theory is gone back imperfection at present, and its one-dimensional consolidation or expansion process also are in the theory study, does not have effective test method to verify.The present invention develops a kind of novel unsaturated soil high pressure consolidation test device exactly, and being used for measuring unsaturated soil, to finish sample under control suction condition fixed, and measures the coefficient of consolidation and compression rule of sample.
Summary of the invention
The object of the invention provides a kind of novel unsaturated soil high pressure consolidation test device, is used for solving unsaturated soil and carries out the high pressure consolidation test test under the condition of control matric suction.
Technical solution of the present invention is characterized in that a kind of novel unsaturated soil high pressure consolidation test device mainly comprises vertical pressuring shaft 1, pressure chamber 2, pressure at right angle sensor 3, perpendicular displacement sensor 8, pore water pressure sensor 9, consolidation pressure box 10, pressure chamber's base 11, hole air pipe 12, the first pore water pipeline 13, the second pore water pipeline 14, rolling diaphragm 15, instrument base 16, piston 17, force transmission shaft 18, inlet pipeline 19, vent port valve 22, first set bolt 23, second set bolt 24; Wherein, consolidation pressure box 10 comprises upper top cover 4, permeable stone 5, sample 6 and potter's clay plate 7, permeable stone 5 is installed below the upper top cover 4, sample 6 is installed below the permeable stone 5, sample 6 bottoms connect potter's clay plate 7, pressure chamber 2 comprises internal pressure chamber 20 and external pressure chamber 21, pressure chamber 2 is installed on pressure chamber's base 11, vertical pressuring shaft 1 connects pressure at right angle sensor 3,3 pairs of pseudoconsolidation pressure boxes 10 of pressure at right angle sensor, consolidation pressure box 10 bottoms connect hole air pipe 12, the first pore water pipeline 13 and the second pore water pipeline 14, the second pore water pipeline 14 is connected with pore water pressure sensor 9, pressure chamber's base 11 connects pistons 17 by force transmission shaft 18, rolling diaphragm 15 is installed below the piston 17, instrument base 16 is installed below the rolling diaphragm 15.
Vertical pressuring shaft 1, pressure chamber 2, pressure chamber's base 11, instrument base 16, force transmission shaft 18 all adopt stainless steel material, and upper top cover 4 adopts copper material, and potter's clay plate 7 air-entry values require to be not less than 1500kPa, and infiltration coefficient is not less than 10
-8Cm/s, hole air pipe 12, the first pore water pipeline 13, the second pore water pipeline 14 all adopt the nylon tube material, the shell of pressure at right angle sensor 3, perpendicular displacement sensor 8 and pore water pressure sensor 9 all adopts titanium alloy material, the axial force maximal value of pressure at right angle sensor 3 is not less than 6kN, precision is not less than 1kPa, the displacement maximal value of perpendicular displacement sensor 8 is not less than 15cm, precision is not less than 0.01mm, the pressure maximal value of pore water pressure sensor 9 is not less than 1.0MPa, and precision is not less than 1kPa.
Advantage of the present invention:
The instrument manufacturing is simple, and the measuring accuracy height satisfies unsaturated soil triaxial pressure test request, can measure the unsaturated soil coefficient of consolidation and compression rule under the control suction condition.
The scope of application of the present invention:
Be applicable to that the high pressure consolidation test of various soil properties under unsaturated state that runs in the civil engineering work measures.
Description of drawings:
Fig. 1 is a kind of novel unsaturated soil high pressure consolidation test apparatus structure synoptic diagram.Wherein have: vertical pressuring shaft 1, pressure chamber 2, pressure at right angle sensor 3, upper top cover 4, permeable stone 5, sample 6, potter's clay plate 7, perpendicular displacement sensor 8, pore water pressure sensor 9, consolidation pressure box 10, pressure chamber's base 11, hole air pipe 12, the first pore water pipeline 13, the second pore water pipeline 14, rolling diaphragm 15, instrument base 16, piston 17, force transmission shaft 18, inlet pipeline 19, internal pressure chamber 20, external pressure chamber 21, vent port valve 22, first set bolt 23, second set bolt 24.
Embodiment:
Embodiment: the method that measures the unsaturated soil high pressure coefficient of consolidation under the control suction condition is as follows,
1. measure sample 6 initial masses, water cut, density and height, it is saturated that potter's clay plate 7 is bled, and at potter's clay plate 7 sample 6 is installed then, at sample 6 permeable stone 5 is installed, and is surrounded by rubber diaphragm around permeable stone 5 and the sample 6, installs top cover 4 at sample 5;
2. pressure chamber 2 is installed on pressure chamber's base 11, tighten first set bolt 23 and second set bolt 24, open vent port valve 22, in pressure chamber 2, fill distilled water by inlet pipeline 19, when water to be distilled overflows from vent port valve 22, tighten vent port valve 22;
3. pressure at right angle sensor 3 is withstood upper top cover 4, after applying certain ambient pressure and pressure at right angle, apply certain pore air pressure and pore water pressure respectively by hole air pipe 12 and the first pore water pipeline 13, the pore water pressure sensor 9 that connects by the second pore water pipeline 14 measures the variation of sample 6 internal void water pressures;
4. control pore water pressure and pore air pressure is constant, treat that pore water pressure sensor 9 readings show when per hour being not more than 1kPa, measure deflection after fixed to sample from perpendicular displacement sensor 8, can calculate the void ratio of sample 6, obtain the corresponding relation of one group of void ratio and pressure at right angle;
5. keep pore water pressure and pore air pressure constant, under certain ambient pressure, after changing different pressure at right angles, treat that pore water pressure sensor 9 readings show when per hour being not more than 1kPa, deflection after fixed to sample from 8 measurements of perpendicular displacement sensor, can calculate the new void ratio of sample 6, obtain the corresponding relation of another group void ratio and pressure at right angle;
6. according to the corresponding relation that 5. can obtain many group void ratios and pressure at right angle, can calculate and try to achieve the unsaturated soil coefficient of consolidation of sample 6 under control suction.
Claims (2)
1. a unsaturated soil high pressure consolidation test device is characterized in that this device comprises vertical pressuring shaft (1), pressure chamber (2), pressure at right angle sensor (3), perpendicular displacement sensor (8), pore water pressure sensor (9), consolidation pressure box (10), pressure chamber's base (11), hole air pipe (12), the first pore water pipeline (13), the second pore water pipeline (14), rolling diaphragm (15), instrument base (16), piston (17), force transmission shaft (18), inlet pipeline (19), vent port valve (22), first set bolt (23), second set bolt (24); Wherein, consolidation pressure box (10) comprises upper top cover (4), permeable stone (5), sample (6) and potter's clay plate (7), permeable stone (5) is installed below the upper top cover (4), sample (6) is installed below the permeable stone (5), sample (6) bottom connects potter's clay plate (7), pressure chamber (2) comprises internal pressure chamber (20) and external pressure chamber (21), pressure chamber (2) is installed on pressure chamber's base (11), vertical pressuring shaft (1) connects pressure at right angle sensor (3), pressure at right angle sensor (3) is to pseudoconsolidation pressure box (10), consolidation pressure box (10) bottom connects hole air pipe (12), the first pore water pipeline (13) and the second pore water pipeline (14), the second pore water pipeline (14) is connected with pore water pressure sensor (9), pressure chamber's base (11) connects piston (17) by force transmission shaft (18), rolling diaphragm (15) is installed below the piston (17), instrument base (16) is installed below the rolling diaphragm (15); Vertical pressuring shaft (1), pressure chamber (2), pressure chamber's base (11), instrument base (16), force transmission shaft (18) all adopt stainless steel material, upper top cover (4) adopts copper material, potter's clay plate (7) air-entry value requires to be not less than 1500kPa, and infiltration coefficient is not less than 10
-8Cm/s, hole air pipe (12), the first pore water pipeline (13), the second pore water pipeline (14) all adopt the nylon tube material, the shell of pressure at right angle sensor (3), perpendicular displacement sensor (8) and pore water pressure sensor (9) all adopts titanium alloy material, the axial force maximal value of pressure at right angle sensor (3) is not less than 6kN, precision is not less than 1kPa, the displacement maximal value of perpendicular displacement sensor (8) is not less than 15cm, precision is not less than 0.01mm, the pressure maximal value of pore water pressure sensor (9) is not less than 1.0MPa, and precision is not less than 1kPa.
2. with the test unit described in the claim 1, it is as follows to be used for measuring the method for controlling the unsaturated soil high pressure coefficient of consolidation under the suction condition,
1. measure sample (6) initial mass, water cut, density and height, bleed potter's clay plate (7) saturated, at potter's clay plate (7) sample (6) is installed then, at sample (6) permeable stone (5) is installed, permeable stone (5) and sample (6) are surrounded by rubber diaphragm on every side, install top cover (4) at sample (6);
2. pressure chamber (2) are installed on pressure chamber's base (11), tighten first set bolt (23) and second set bolt (24), open vent port valve (22), in pressure chamber (2), fill distilled water by inlet pipeline (19), water to be distilled when overflowing, is tightened vent port valve (22) from vent port valve (22);
3. pressure at right angle sensor (3) is withstood upper top cover (4), after applying certain ambient pressure and pressure at right angle, apply certain pore air pressure and pore water pressure respectively by hole air pipe (12) and the first pore water pipeline (13), the pore water pressure sensor (9) that connects by the second pore water pipeline (14) measures the variation of sample (6) internal void water pressure;
4. control pore water pressure and pore air pressure is constant, treat that pore water pressure sensor (9) reading shows when per hour being not more than 1kPa, deflection after fixed to sample from perpendicular displacement sensor (8) measurement, can calculate the void ratio of sample (6), obtain the corresponding relation of one group of void ratio and pressure at right angle;
5. keep pore water pressure and pore air pressure constant, under certain ambient pressure, after changing different pressure at right angles, treat that pore water pressure sensor (9) reading shows when per hour being not more than 1kPa, deflection after fixed to sample from perpendicular displacement sensor (8) measurement, can calculate the new void ratio of sample (6), obtain the corresponding relation of another group void ratio and pressure at right angle;
6. according to the corresponding relation that 5. can obtain many group void ratios and pressure at right angle, can calculate and try to achieve the unsaturated soil coefficient of consolidation of sample (6) under control suction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110030140 CN102183622B (en) | 2011-01-28 | 2011-01-28 | Novel unsaturated soil high-pressure consolidation test device |
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| CN 201110030140 CN102183622B (en) | 2011-01-28 | 2011-01-28 | Novel unsaturated soil high-pressure consolidation test device |
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| CN102183622A CN102183622A (en) | 2011-09-14 |
| CN102183622B true CN102183622B (en) | 2013-09-11 |
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| CN102507904B (en) * | 2011-11-04 | 2014-05-28 | 北京交通大学 | Thermal consolidation pressure room of hollow column sample |
| CN102539244A (en) * | 2012-02-21 | 2012-07-04 | 上海大学 | Unsaturated soil anisotropic consolidation test device |
| CN102830215B (en) * | 2012-09-03 | 2014-10-29 | 中国矿业大学 | High-pressure clay consolidating instrument |
| CN104020273A (en) * | 2013-03-01 | 2014-09-03 | 中国地质科学院水文地质环境地质研究所 | Ultrahigh pressure consolidation test device and method |
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| CZ2014301A3 (en) * | 2014-05-05 | 2015-02-25 | ISATech s.r.o. | Laboratory measuring apparatus for testing properties of rocks |
| CN104165981B (en) * | 2014-07-28 | 2015-11-25 | 西南交通大学 | Observation of The Suction device in a kind of consolidation test |
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| CN106769772A (en) * | 2017-01-11 | 2017-05-31 | 河海大学 | The device and its monitoring method of real-time monitoring dry ground consolidation process |
| CN107764645B (en) * | 2017-10-09 | 2021-05-07 | 中国矿业大学 | Large-size clay high-pressure consolidation test device |
| CN107941604B (en) * | 2018-01-10 | 2023-11-17 | 中国科学院武汉岩土力学研究所 | Consolidation test device and test method for gas-containing soil |
| CN108918390B (en) * | 2018-08-10 | 2023-11-07 | 河海大学 | Device and method for forming mud film and measuring consolidation amount and air inflow of mud film |
| CN110376224A (en) * | 2019-06-11 | 2019-10-25 | 河海大学 | CT scan consolidation apparatus and its application method |
| CN110608953A (en) * | 2019-10-18 | 2019-12-24 | 中铁第一勘察设计院集团有限公司 | Triaxial test soil unit central position pore water pressure test system |
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| CN2479498Y (en) * | 2001-05-26 | 2002-02-27 | 中国科学院寒区旱区环境与工程研究所 | Low-temperature and high pressure ko consolidation instrument |
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| CN2479498Y (en) * | 2001-05-26 | 2002-02-27 | 中国科学院寒区旱区环境与工程研究所 | Low-temperature and high pressure ko consolidation instrument |
| WO2005066421A1 (en) * | 2003-12-26 | 2005-07-21 | Masuda Giken Co., Ltd. | Testing method and apparatus ground liquefaction and dynamic characteristics in original position utilizing boring hole |
| CN201387312Y (en) * | 2009-04-10 | 2010-01-20 | 中国地质大学（武汉） | Consolidometer |
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