CN104964878B - The triaxial test system and method for unsaturated soil multi- scenarios method - Google Patents

The triaxial test system and method for unsaturated soil multi- scenarios method Download PDF

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Publication number
CN104964878B
CN104964878B CN201510409634.7A CN201510409634A CN104964878B CN 104964878 B CN104964878 B CN 104964878B CN 201510409634 A CN201510409634 A CN 201510409634A CN 104964878 B CN104964878 B CN 104964878B
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China
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pressure
soil sample
unit
chemical solution
soil
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CN201510409634.7A
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CN104964878A (en
Inventor
马田田
韦昌富
夏晓龙
陈盼
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中国科学院武汉岩土力学研究所
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Abstract

The invention discloses a kind of triaxial test system and method for unsaturated soil multi- scenarios method, it is related to the soil test field under environmental load.This pilot system is:Soil sample is provided with triaxial pressure room;Confined pressure applies and body becomes monitoring unit, axle power applying unit, matric suction applying unit, temperature control unit, chemical solution circulation permeation unit and axial displacement measuring unit and is connected with triaxial cell respectively, realizes applying soil sample every load of setting;Data acquisition unit applies with confined pressure respectively and body becomes monitoring unit, axle power applying unit, matric suction applying unit, temperature control unit, chemical solution circulation permeation unit and axial displacement measuring unit and is connected, and realizes the collection of each item data.The present invention is applied to wet desorption of the unsaturated soil under different chemical actions, different temperatures, consolidation, undrained shear and drained shear test, realizes the simultaneous determination of temperature, waterpower, mechanics and the chemical Coupling behavior of unsaturated soil.

Description

The triaxial test system and method for unsaturated soil multi- scenarios method
Technical field
The present invention relates to the soil test field under environmental load, more particularly to a kind of three axles of unsaturated soil multi- scenarios method Pilot system and its method.
Unsaturated soil multi- scenarios method of the present invention refers to that temperature, waterpower, mechanics and the chemical Coupling of unsaturated soil are made Mechanics and water under the chemical load action such as salting liquid, weak acid and weak base with, it is possible to achieve unsaturated soil under various concentrations Experiments of Machanics, and it can be considered that the influence of temperature.It is related to temperature of the bentonite under long service during nuke rubbish is sealed up for safekeeping Degree, waterpower, mechanics and chemical coupling effect, and change the change of the concentration and component of the pore solution for causing due to natural conditions Change, and then change intensity and deformation characteristic of the soil body etc..
Background technology
Under environmental load (such as power effect, seepage flow, temperature and electrochemical conditions change) effect, soil body mesopore solution is removed Content can change outer, and its concentration and component can also change so that the phase interaction between pore water pressure and soil particle Firmly change, complicated chemistry and Coupling with Mechanics effect occur so as to cause the soil body.For example in refuse landfill, due to The migration of various solutes so that the concentration and component of pore solution change, and then change structure, intensity and the deformation of the soil body Characteristic etc., easily triggers the sedimentation of landfill yard or caves in.During Nuclear Waste Repository operation, near field electrochemical conditions are very multiple It is miscellaneous.Under diffusion kernel radiant heat and subsurface wastewater infiltration system effect, bentonite is subjected to long-term drying and watering cycle, causes ground water chemistry concentration Change repeatedly, so as to trigger the change of the critical natures such as infiltration and mechanical stability.Therefore, analysis Surrounding Nuclear Waste Repositories disposal, During the Important Project problem such as Polluted Soil landfill, rainfall induced landslide, earth surface cracks, one of crucial problem is how effectively to retouch State the influence of temperature, waterpower, mechanics and the chemical Coupling behavior of unsaturated soil.
At present, the research of trip temperature, waterpower, mechanics and chemical Coupling behavior is entered primarily directed to saturated soil both at home and abroad, and When being related to unsaturated soil, the research of this respect is less, is primarily due to experiment of the unsaturated soil at temperature and chemical load Implement more difficult, and lack more ripe testing equipment.The current testing equipment on unsaturated soil, primarily directed to base Matter suction control technique, and body becomes e measurement technology and develops, it is impossible to complete non-full under temperature and chemical load action With the mechanics and the measure of waterpower behavior of soil.
The content of the invention
The purpose of the present invention is that the shortcoming and defect for overcoming prior art to exist, there is provided a kind of many couplings of unsaturated soil The triaxial test system and method for conjunction.
The object of the present invention is achieved like this:
First, the triaxial test system (abbreviation pilot system) of unsaturated soil multi- scenarios method
This pilot system includes that triaxial cell, confined pressure apply and body becomes monitoring unit, axle power applying unit, matric suction Applying unit, temperature control unit, chemical solution circulation permeation unit, axial displacement measuring unit and data acquisition unit;
Its annexation is:
Soil sample is provided with triaxial pressure room;
Confined pressure applies and body becomes monitoring unit, axle power applying unit, matric suction applying unit, temperature control unit, change Learn solution circulation permeation unit and axial displacement measuring unit be connected with triaxial cell respectively and, realize to soil sample applying setting Every load;
Data acquisition unit applies with confined pressure respectively and body becomes monitoring unit, axle power applying unit, matric suction and applies single Unit, temperature control unit, chemical solution circulation permeation unit and the connection of axial displacement measuring unit, realize adopting for each item data Collection.
The operation principle of this pilot system:
Chemical solution circulates permeation unit, is put respectively using osmotic pressure and fixing fabric structure device and pore pressure and fixing fabric structure device In the upper and lower ends of soil sample, penetration and replacement process of the chemical solution in soil sample can be controlled by flow and pressure respectively;When When being controlled using flow, chemical solution passes through soil sample, osmotic pressure and fixing fabric structure device and pore pressure and volume with certain flow Controller records the pressure change of soil sample upper and lower ends in the process of osmosis;When using Stress control, that is, control soil sample upper and lower The barometric gradient at two ends, chemical solution is under the barometric gradient by the flow in soil sample, and real-time monitoring process of osmosis;Its Apply the pore pressure and fixing fabric structure device of pore water pressure in the pore pressure and fixing fabric structure device and matric suction unit of middle soil sample lower end Share one.
Become monitoring unit by confined pressure applying and body to apply the confined pressure required for soil sample, and monitor soil sample and testing Volume Changes situation in journey, the Real-time Collection of data is realized by data acquisition unit;The unit is using confined pressure and volume Triaxial cell's connection of controller and soil sample, applies pressure, so as to realize applying soil sample by the water in triaxial cell Fixed confined pressure is added, and monitors the inflow and outflow in process of the test reclaimed water in controller, so that inverse goes out the volume of soil sample Change.
Temperature is adjusted by temperature control unit, chemical test, the hydraulics test of unsaturated soil under different temperatures is carried out And mechanical test;
Connected by the bottom of axle power applying unit and triaxial cell, axle power is applied to soil sample;The unit is using strain Control, that is to say, that soil sample is sheared under the axial displacement loading velocity of setting, is determined by axial dynamometer and loaded Axial force in journey;
Control the matric suction of soil sample by matric suction applying unit, matric suction refer to soil sample mesopore atmospheric pressure with The difference of pore water pressure;Hole air pressure is provided using air compressor machine, is applied on soil sample top, and pressure is carried out using gas pressure regulator Control;Pore water pressure refers to just the pore water back-pressure of soil sample, is applied in soil sample bottom using pore pressure and fixing fabric structure device;Soil Sample bottom is connected with pottery clay plates, is connected with pore pressure and fixing fabric structure device below pottery clay plates;Pottery clay plates are permeable air-locked, therefore Pressure is applied to the water in pottery clay plates so as to realize applying pore water back-pressure to soil sample by pore pressure and fixing fabric structure device.It is wherein native The pore pressure and fixing fabric structure device of soil sample lower end are common in pore pressure and fixing fabric structure device and chemical solution the circulation permeation unit of sample lower end With one;
Connected by the top of shaft position sensor and triaxial cell, process of the test is carried out by data acquisition unit The Real-time Collection of middle soil sample axial displacement;
Whole process realizes real-time control and the measurement of temperature, waterpower, mechanics and chemical load, this four kinds controls of effect System is separate, can individually be applied, it is also possible to while apply, it is achieved that temperature, waterpower, power to unsaturated soil Learn and the various characteristics of chemical Coupling behavior are tested.
2nd, the triaxial test method (abbreviation test method) of unsaturated soil multi- scenarios method
This test method is the triaxial test system based on above-mentioned unsaturated soil multi- scenarios method, is comprised the following steps:
1. the preparation and installation of soil sample
Soil sample can use undisturbed or reinvent sample, and the pottery clay plates on triaxial cell's base are carried out into saturation;Then will The soil sample for preparing is inserted in rubber membrane, is compacted, to exclude the air in film, be placed on the pottery clay plates of saturation together, soil sample slightly Porous plate is placed on top, then with elastic string by up and down the two of rubber membrane (rubber membrane upper and lower ends are longer than the upper and lower ends of soil sample) End tightens on the base of triaxial cell and on porous plate respectively;
2. chemical solution is prepared
According to test requirements document, chemical solution is prepared according to required concentration and component (including various salting liquids, weak acid, weak Alkali etc.);Start the osmotic pressure and fixing fabric structure device of chemical solution circulation permeation unit by chemical solution injecting controller;
3. test
A, the soil-water characteristic curve for determining different chemical solutions, different temperatures, different confined pressures and axle pressure unsaturated soil;
B, determine different chemical solutions, different temperatures, different substrates suction and under confined pressure three axle drainings of unsaturated soil and Undrained shear is tested;
C, the mechanics of measure chemical solution circulation change and the lower unsaturated soil of temperature cycles change and hydraulic characteristic Change;
D, different stress and lower sensitivity analysis of the unsaturated soil to chemistry and temperature of matric suction effect.
The present invention has the advantages that:
1. chemistry loading, temperature loading, mechanics and hydraulics loading can be controlled individually, according to the Experiment Road of setting Footpath is tested, and is individually applied or is applied simultaneously;
2. chemical solution circulation permeation unit, may be such that solution realizes uniformly penetrating and distribution in soil sample, and can divide Do not loaded by way of controlling flow and pressure;
3. desorption wet test, consolidation test, the undrained shear experiment of unsaturated soil can be respectively carried out to same soil sample And drained shear test, and realize unsaturated soils theory property and hydraulic properties under different temperatures and different chemical actions Simultaneous determination;
4. being capable of Volume Changes and axial displacement of the accurate measurement measurement soil sample in process of the test;
5. the real-time monitoring and automatic data collection of all test datas are realized, artificial reading on duty is not required to;
6. the device to test principle is directly perceived, simple structure, without jumbo, cheap;And high precision, stability Good, easily operated, convenient disassembly, to installing tester without technical requirements very high.
The present invention is applied to wet desorption of the unsaturated soil under different chemical actions, different temperatures, consolidation, undrained shear And drained shear test, realize the simultaneous determination of temperature, waterpower, mechanics and the chemical Coupling behavior of unsaturated soil.
Brief description of the drawings
Fig. 1 is the block diagram of this pilot system;
Fig. 2 is the structural representation of this pilot system;
Fig. 3 is the top view of the base 1.6 of triaxial cell 1;
Fig. 4 is data acquisition unit block diagram.
In figure:
0-soil sample;
1-triaxial cell,
1.1-balancing gate pit outer cover, 1.2-exhaust passage, 1.3-confined pressure duct,
1.4-chemical solution duct, 1.5-pottery clay plates, 1.6-base,
1.7-hole stomata road, 1.8-pore water duct, 1.9-porous plate;
2-confined pressure applies and body becomes monitoring unit,
2.1-confined pressure and fixing fabric structure device, 2.2-confined pressure valve;
3-axle power applying unit,
3.1-lifting platform, 3.2-handwheel,
3.3-axial dynamometer, 3.4-testing machine;
4-matric suction applying unit,
4.1-gas pressure regulator, 4.2-air compressor machine, 4.3-hole air valve,
4.4-pore pressure and fixing fabric structure device, 4.5-hole penstock;
5-temperature control unit,
5.1-resistance wire, 5.2-cryogenic thermostat cryostat, 5.3-cryostat liquid circulation copper pipe,
5.4-temperature controller;
6-chemical solution circulates permeation unit,
6.1-osmotic pressure and fixing fabric structure device, 6.2-chemical solution valve;
7-axial displacement measuring unit,
7.1-axial displacement dial gauge, 7.2-displacement surveymeter;
8-data acquisition unit,
8.1-confined pressure sensor, 8.2-flow sensor, 8.3-chemical solution pressure sensor,
8.4-chemical solution flow sensor, 8.5-axial force sensor, 8.6-pore air pressure sensor,
8.7-pore water pressure sensor, 8.8-hole water flow sensor, 8.9-temperature sensor,
8.10-shaft position sensor, 8.11-data collecting instrument, 8.12-computer.
Specific embodiment
Describe in detail with reference to the accompanying drawings and examples:
First, pilot system
1st, it is overall
Such as Fig. 1,2, it is single that this pilot system includes that the applying of triaxial cell 1, confined pressure and body become the applying of monitoring unit 2, axle power Unit 3, matric suction applying unit 4, temperature control unit 5, chemical solution circulation permeation unit 6, the and of axial displacement measuring unit 7 Data acquisition unit 8;
Its annexation is:
Soil sample 0 is provided with triaxial cell 1;
Confined pressure applies and body becomes monitoring unit 2, axle power applying unit 3, matric suction applying unit 4, temperature control unit 5th, chemical solution circulation permeation unit 6 and axial displacement measuring unit 7 are connected with triaxial cell 1 respectively, and realization is applied to soil sample 0 Add fixed every load;
Specifically, confined pressure applies and body becomes monitoring unit 2 and triaxial cell 1 connects, and applying setting to soil sample 0 encloses Pressure, and the real time measure soil sample 0 Volume Changes;
Axle power applying unit 3 and triaxial cell 1 are connected, and the axle power of setting is applied to soil sample 0;
Matric suction applying unit 4 and triaxial cell 1 are connected, and the matric suction that soil sample 0 applies setting (is set respectively Pore air pressure and pore water pressure), and the flow of suction or discharge solution in soil sample is recorded, while judging corresponding this one-level base Whether matter suction soil sample reaches poised state;
Temperature control unit 5 and triaxial cell 1 are connected, and the temperature of setting is applied to soil sample 0;
Chemical solution circulates permeation unit 6 and triaxial cell 1 connects, and the chemical load of setting is applied to soil sample 0, and in fact When determine chemical solution process of osmosis in flow change or the change of pressure;
Axial displacement measuring unit 7 and triaxial cell 1 are connected, and the axial displacement in the process of the test of soil sample 0 is surveyed in real time Amount;
Data acquisition unit 8 applies with confined pressure respectively and body becomes monitoring unit 2, axle power applying unit 3, matric suction and applies Unit 4, temperature control unit 5, chemical solution circulation permeation unit 6 and axial displacement measuring unit 7 are connected, and realize each item data Collection:
Specifically, data acquisition unit 8 and confined pressure apply and body becomes monitoring unit 2 and connects, in the collection process of the test of soil sample 0 Confined pressure, and real-time monitoring soil sample 0 Volume Changes;
Data acquisition unit 8 and axle power applying unit 3 are connected, the axle power in the collection process of the test of soil sample 0;
Data acquisition unit 8 and matric suction applying unit 4 are connected, and the matric suction in the collection process of the test of soil sample 0 (divides Cai Ji pore air pressure and pore water pressure), and the inflow and outflow solution of real-time monitoring soil sample 0 flow, while judging correspondence Whether this grade matrix suction soil sample 0 reaches poised state, calculates water content of the soil sample 0 under the grade matrix suction;
Data acquisition unit 8 and temperature control unit 5 are connected, the temperature in the collection process of the test of soil sample 0;
Data acquisition unit 8 and chemical solution circulation permeation unit 6 are connected, the chemical lotus in the collection process of the test of soil sample 0 Carry, the change or the change of pressure of flow in real-time monitoring chemical solution process of osmosis;
Data acquisition unit 8 and axial displacement measuring unit 7 are connected, the axial displacement in the collection process of the test of soil sample 0.
2nd, functional block
0) soil sample 0
Soil sample 0 is using undisturbed or reinvents sample;It is the standard size of triaxial test soil sample:Diameter 39.1cm, be highly 8cm。
1) triaxial cell 1
Such as Fig. 1,2,3, described triaxial cell 1 include balancing gate pit's outer cover 1.1, exhaust passage 1.2, confined pressure duct 1.3, Chemical solution duct 1.4, pottery clay plates 1.5, base 1.6, hole stomata road 1.7, pore water duct 1.8 and porous plate 1.9;
Its annexation is:
Balancing gate pit's outer cover 1.1 is arranged on base 1.6, and pottery clay plates 1.5 are placed on the middle part of base 1.6, in pottery clay plates 1.5 Top is placed with soil sample 0, and exhaust passage 1.2 is arranged on the top of balancing gate pit's outer cover 1.1, for the air in pressure release room;
Confined pressure duct 1.3 is arranged on the edge of base 1.6 (Fig. 3 upper lefts), for applying confined pressure;
Chemical solution duct 1.4 is arranged on the edge of base 1.6 (under Fig. 3), and the porous plate 1.9 on the top of soil sample 0 connects Connect, for the circulation infiltration of chemical solution;
Hole stomata road 1.7 is arranged on the edge of base 1.6 (Fig. 3 upper rights), and the porous plate 1.9 on the top of soil sample 0 connects Connect, for applying air pressure to soil sample 0;
Pore water duct 1.8 is arranged on the center of base 1.6 (Fig. 3 centers), in the lower section of pottery clay plates 1.5, a work( Can apply pore water pressure to soil sample 0, another function is permeated for carrying out the circulation of chemical solution to soil sample 0.
The function of triaxial cell 1 is:
Soil sample 0 is placed, realizes that soil sample 0 is determined in the experiment of Duo Chang (temperature, waterpower, mechanics and chemistry) coupled characteristic.
The operation principle of triaxial cell 1 is:
Soil sample 0 is placed on pottery clay plates 1.5, water is filled toward triaxial cell 1, opened exhaust passage 1.2 and arranged Gas;Then apply applying of the pressure realization to the confined pressure of soil sample 0 to water, and by the inflow and outflow of the reclaimed water of triaxial cell 1, enter And Volume Changes of the inverse soil sample 0 in process of the test.
2) confined pressure applies and body becomes monitoring unit 2
Such as Fig. 1,2, described confined pressure applies and body becomes monitoring unit 2 and includes confined pressure and fixing fabric structure device 2.1 and confined pressure valve 2.2;
Its annexation is:
Confined pressure and fixing fabric structure device 2.1 and confined pressure valve 2.2 are connected, the confined pressure duct of confined pressure valve 2.2 and triaxial cell 1 1.3 connections;
Confined pressure and fixing fabric structure device 2.1 are connected by signal transmssion line and data acquisition unit 8, and soil sample 0 was being tested Confined pressure and body change in journey is acquired.
Confined pressure and fixing fabric structure device 2.1 are a kind of general parts, i.e., a kind of general water pressure source and volume changing measurement mechanism, From the production of GDS companies, model:ELDPC;
Pressure limit:0~1Mpa, pressure precision:0.25%, pressure resolution:1kPa;
Volume range:0~200cc, volume accuracy:0.4%, volume resolution ratio:1mm3(0.001cc)。
Confined pressure applies and the function of body change monitoring unit 2 is:
Required confined pressure is applied to soil sample 0, the every experiment of unsaturated soil under different confined pressures is carried out, and real-time monitoring is tested During soil sample 0 Volume Changes.
Confined pressure applies and the operation principle of body change monitoring unit 2 is:
Confined pressure and fixing fabric structure device 2.1 apply confined pressure, confined pressure valve according to the pressure of setting to the water in triaxial cell 1 2.2 are used for controlling water flowing in and out in triaxial cell 1 and confined pressure and fixing fabric structure device 2.1;In process of the test, enclose The flow of pressure and the real time record water of fixing fabric structure device 2.1, and then calculate the Volume Changes of soil sample 0.
3) axle power applying unit 3
Such as Fig. 2, described axle power applying unit 3 includes lifting platform 3.1, handwheel 3.2, axial dynamometer 3.3 and testing machine 3.4;
Its annexation is:
From top to bottom, testing machine 3.4, lifting platform 3.1, triaxial cell 1 and axial dynamometer 3.3 are sequentially connected, to soil Sample 0 applies axle power;
Handwheel 3.2 is provided with testing machine 3.4, plays unloading;
Axial dynamometer 3.3 is connected by signal transmssion line and data acquisition unit 8, to soil sample 0 in process of the test Axle power is acquired;
Lifting platform 3.1, handwheel 3.2, axial dynamometer 3.3 and testing machine 3.4 are general part.
The function of axle power applying unit 3 is:
Axle power is applied to soil sample 0, three axle drainings under the effect of different chemical loads, temperature, confined pressure and matric suction are carried out Shearing and undrained shear experiment.
The operation principle of axle power applying unit 3 is:
It is strain controlling formula that axle power applies, and drives lifting platform 3.1 to rise with certain speed by testing machine 3.4, soil sample 0 Axial strain increasing always, applying to the axial force of soil sample 0 is realized, until soil sample 0 is destroyed;By axial dynamometer 3.3 The axle power value for being applied, and Real-time Collection is carried out to axle power by being connected with data acquisition unit 8.
4) matric suction applying unit 4
Such as Fig. 1,2, described matric suction applying unit 4 includes gas pressure regulator 4.1, air compressor machine 4.2, hole air valve 4.3rd, pore pressure and fixing fabric structure device 4.4 and hole penstock 4.5;
Its annexation is:
Air compressor machine 4.2, gas pressure regulator 4.1 and hole air valve 4.3 are sequentially connected, the axle pressure of hole air valve 4.3 and three The hole stomata road 1.7 of power room 1 is connected, and pore air pressure is applied to soil sample 0;
Pore pressure and fixing fabric structure device 4.4 and hole penstock 4.5 are connected, the hole of hole penstock 4.5 and triaxial cell 1 Gap water hole road 1.8 is connected, and pore water pressure is applied to soil sample 0, while being sucked in monitoring soil sample 0 or discharging pore solution Flow, and then draw the situation of change of the water content of soil sample 0;
Gas pressure regulator 4.1 and pore pressure and fixing fabric structure device 4.3 are connected by signal transmssion line and data acquisition unit 8, Collection to pore air pressure, pore water pressure and change of moisture content in the process of the test of soil sample 0.
Pore pressure and fixing fabric structure device 4.4 are a kind of general parts, i.e., a kind of general water pressure source and Volume Changes (flow) are surveyed Amount device;From the production of GDS companies, model:ELDPC;
Pressure limit:0~1Mpa, pressure precision:0.25%, pressure resolution:1kPa;
Volume range:0~200cc, volume accuracy:0.4%, volume resolution ratio:1mm3(0.001cc)。
The function of matric suction applying unit 4 is:
Apply the matric suction of setting to soil sample 0, carry out the triaxial test of unsaturated soil under given matric suction, and pass through Pore pressure and fixing fabric structure device 4.4 measure the quality that soil sample 0 sucked or discharged pore solution, and then inverse goes out soil sample 0 in the level Corresponding water content under matric suction.
The operation principle of matric suction applying unit 4 is:
The matric suction of soil sample 0 refers to the difference of pore air pressure and pore water pressure, and the matric suction applying unit 4 is led to The numerical value of control hole gap atmospheric pressure and pore water pressure respectively is crossed, specific matric suction is applied to soil sample 0 so as to reach;Hole Atmospheric pressure applies on the top of soil sample 0, and pore water pressure applies in the bottom of soil sample 0;Under given matric suction effect, soil Pore solution in sample 0 is sucked or flowed out in pore pressure and fixing fabric structure device 4.4 by pottery clay plates 1.5, pore pressure and fixing fabric structure The real time record amount of flowing in or out of device 4.4, and then calculate water content of the soil sample 0 under the matric suction of the setting.
5) temperature control unit 5
Such as Fig. 1,2, described temperature control unit 5 includes resistance wire 5.1, cryogenic thermostat cryostat 5.2, cryostat liquid circulation copper Pipe 5.3 and temperature controller 5.4;
Its annexation is:
Resistance wire 5.1 and cryostat liquid circulation copper pipe 5.3 are respectively placed on the inwall of triaxial cell's outer cover 1.1, and low temperature is permanent Warm cryostat 5.2 and cryostat liquid circulation copper pipe 5.3 are connected, and resistance wire 5.1 and cryogenic thermostat cryostat 5.2 are respectively and temperature controller 5.4 connections, control temperature;
Temperature controller 5.4 is connected by signal transmssion line and data acquisition unit 8, to soil sample 0 in process of the test Temperature is acquired.
The function of temperature control unit 5 is:
Temperature required for setting, and keep constant temperature.
The operation principle of temperature control unit 5 is:
Temperature control is carried out to the water in triaxial cell 1 by temperature control unit 5, so as to realize the temperature to soil sample Control;The temperature to be reached is set by temperature controller 5.3, feeds back to built-in if the temperature of water is lower than setting value Resistance wire 5.1 is heated to the water in triaxial cell 1, and cryogenic thermostat cryostat is fed back to if the temperature of water is higher than setting value 5.2 are lowered the temperature, and keeping temperature is constant.
6) chemical solution circulation permeation unit 6
Such as Fig. 1,2, described chemical solution circulates permeation unit 6 includes osmotic pressure and fixing fabric structure device 6.1 and chemistry Solution valve 6.2;
Its annexation is:
Osmotic pressure and fixing fabric structure device 6.1 and chemical solution valve 6.2 are connected, the axle pressure of chemical solution valve 6.2 and three Chemical solution duct 1.4 in power room 1 connects;
Osmotic pressure and fixing fabric structure device 6.1 are connected by signal transmssion line and data acquisition unit 8, and soil sample 0 is tested During osmotic pressure and flow be acquired.
Osmotic pressure and fixing fabric structure device 6.1 are a kind of general parts, i.e., a kind of general water pressure source and Volume Changes (flow Amount) measurement apparatus, from the production of GDS companies, model:ELDPC;
Pressure limit:0~1Mpa, pressure precision:0.25%, pressure resolution:1kPa;
Volume range:0~200cc, volume accuracy:0.4%, volume resolution ratio:1mm3(0.001cc)。
Chemical solution circulation permeation unit 6 function be:
Apply the chemical solution of chemical load, i.e. various concentrations and component to soil sample 0 with certain speed or pressure permeation To in soil sample 0, and the original pore solution of soil sample 0 is cemented out, realize soil sample 0 in different chemical loads, different temperatures bar Under part the desorption of soil sample 0 it is wet, consolidation and shearing test.
Chemical solution circulation permeation unit 6 operation principle be:
Chemical solution circulates permeation unit 6 and shares a pore pressure and fixing fabric structure device 4.4 with matric suction applying unit 4, For applying the flow of pore water pressure or setting pore solution in the bottom of soil sample 0;It is single in chemical solution circulation infiltration Full of the chemical solution for preparing in the osmotic pressure and fixing fabric structure device 6.1 of unit 6, pressure or flow are set, opened Chemical solution valve 6.2, during chemical solution penetrates into soil sample 0 according to the pressure or flow of setting from the top of soil sample 0;Open base The hole penstock 4.5 of matter suction applying unit 4, then the original pore solution of soil sample 0 be replaced out, be flowed into matric suction In the pore pressure and fixing fabric structure device 4.4 of applying unit 4;Repeat said process 3 times, the pore solution of the outflow of soil sampling 0 Credit is analysed, if composition is identical with the composition of chemical solution in osmotic pressure and fixing fabric structure device 6.1, is completed transposed Journey;When using Stress control, the chemical solution circulation record chemical solution of permeation unit 6 flows in and out the flow of soil sample 0; When being controlled using flow, the pressure of the upper and lower ends of soil sample 0 is recorded.
7) axial displacement measuring unit 7
Such as Fig. 1,2, described axial displacement measuring unit 7 includes axial displacement dial gauge 7.1 and displacement surveymeter 7.2;
Its annexation is:
The top connection of axial displacement dial gauge 7.1 and displacement surveymeter 7.2, displacement surveymeter 7.2 and triaxial cell 1 Upper contact, axial displacement dial gauge 7.1 is connected by signal transmssion line and data acquisition unit 8, in the process of the test of soil sample 0 Axial displacement be acquired.
The function of axial displacement measuring unit 7 is:
Being capable of soil sample 0 occurs during real-time monitoring unsaturated soil testing axial displacement.
8) data acquisition unit 8
Such as Fig. 1,2,4, described data acquisition unit 8 includes confined pressure sensor 8.1, flow sensor 8.2, chemical solution Pressure sensor 8.3, chemical solution flow sensor 8.4, axial force sensor 8.5, pore air pressure sensor 8.6, pore water Pressure sensor 8.7, hole water flow sensor 8.8, temperature sensor 8.9, shaft position sensor 8.10, data collecting instrument 8.11 and computer 8.12;
Its annexation is:
Have on data collecting instrument 8.11 10 passages respectively with confined pressure sensor 8.1, flow sensor 8.2, chemical solution Pressure sensor 8.3, chemical solution flow sensor 8.4, axial force sensor 8.5, pore air pressure sensor 8.6, pore water Pressure sensor 8.7, hole water flow sensor 8.8, temperature sensor 8.9 and shaft position sensor 8.10 are connected, data Acquisition Instrument 8.11 and computer 8.12 are connected;
Confined pressure sensor 8.1 and flow sensor 8.2 are arranged at confined pressure and apply to become the confined pressure and volume of monitoring unit 2 with body On controller 2.1;
It is single that chemical solution pressure sensor 8.3 and chemical solution flow sensor 8.4 are arranged at chemical solution circulation infiltration In the osmotic pressure and fixing fabric structure device 6.1 of unit 6;
Axial force sensor 8.5 is arranged on axial dynamometer 3.3;
Pore air pressure sensor 8.6 is arranged on gas pressure regulator 4.1;
Pore water pressure sensor 8.7 and hole water flow sensor 8.8 are arranged at the pore pressure of matric suction applying unit 4 On fixing fabric structure device 4.3;
Temperature sensor 8.9 is arranged on temperature controller 5.4;
Shaft position sensor 8.10 is arranged on axial displacement dial gauge 7.1;
The function of data acquisition unit 8 is:
Confined pressure in triaxial cell 1 is measured by confined pressure sensor 8.1 and flow sensor 8.2 and three are flowed in and out The flow of the water of axle balancing gate pit 1, and then draw the Volume Changes of soil sample 0;
The chemical solution by soil sample 0 is measured by chemical solution pressure sensor 8.3 and chemical solution flow sensor 8.4 The pressure and flow of liquid;
The real-time axial force of soil sample 0 and axial direction are drawn by axial force sensor 8.5 and shaft position sensor 8.10 respectively Displacement;
Measured by pore air pressure sensor 8.6, pore water pressure sensor 8.7 and hole water flow sensor 8.8 The flow of the pore solution of the pore air pressure, pore water pressure and turnover soil sample of soil sample 0;
Temperature in triaxial cell 1 is measured by temperature sensor 8.9.
(1) confined pressure sensor 8.1
Confined pressure sensor 8.1 is a kind of general part, from the production of Senex companies, pressure limit:0~1Mpa, precision: 0.1%.
Its function is:Measure the confined pressure of soil sample 0.
(2) flow sensor 8.2
Flow sensor 8.2 is a kind of general part, from Ponolflow-VA, measurement range:0~250ml, precision: 0.5%.
Its function is:The amount of flowing in and out of the reclaimed water of triaxial cell 0 is measured, so as in obtaining the process of the test of soil sample 0 Volume change.
(3) chemical solution pressure sensor 8.3
Chemical solution pressure sensor 8.3 is a kind of general part, from the production of Senex companies, pressure limit:0~1Mpa, Precision:0.1%.
Its function is:Measure the pressure of the upper end chemical solution of soil sample 0.
(4) chemical solution flow sensor 8.4
Chemical solution flow sensor 8.4 is a kind of general part, from Ponolflow-VA, measurement range:0~250ml, Precision:0.5%.
Its function is:Measure flow velocity, instantaneous delivery and the integrated flux of the upper end solution of soil sample 0.
(5) axial force sensor 8.5
Axial force sensor 8.5 is a kind of general part, and from KAP-S type pull pressure sensor, specification is:5N~50kN, essence Spend and be:0.5%.
Its function is:Measure the axle power of soil sample 0.
(6) pore air pressure sensor 8.6
Pore air pressure sensor 8.6 is a kind of general part, from the production of Senex companies, pressure limit:0~2Mpa, essence Degree:0.1%.
Its function is:Measure the pore air pressure of soil sample 0.
(7) pore water pressure sensor 8.7
Pore water pressure sensor 8.7 is a kind of general part, from the production of Senex companies, pressure limit:0~1Mpa, essence Degree:0.1%.
Its function is:Measure the pressure of the lower end pore solution of soil sample 0.
(8) hole water flow sensor 8.8
Hole water flow sensor 8.8 is a kind of general part, from Ponolflow-VA, measurement range:0~250ml, essence Degree:0.5%.
Its function is:Measure flow velocity, instantaneous delivery and the integrated flux of the lower end solution of soil sample 0.
(9) temperature sensor 8.9
Temperature sensor 8.9 is a kind of general part, from Pt100 types platinum resistance (Beijing, Pt100 and ), measure model Enclose:- 40~150 DEG C, precision:0.5℃.
Its function is:Measure the temperature of soil sample 0.
(10) shaft position sensor 8.10
Shaft position sensor 8.10 is a kind of general part, from ZKL-W types displacement transducer (LVDT), range 0~ 800mm, it is a diameter ofPrecision is 0.1%.
Its function is:The axial deformation of soil sample 0 in measurement process of the test.
(11) data collecting instrument 8.11
Data collecting instrument 8.11 is a kind of general part, from the TSW-3 of Nanjing production.
Its function is:Connection sensor is acquired to data.
(12) computer 8.12
The hardware configuration of computer 8.12 is:Intel i3-4160CPU@3.6GHZ;4GB internal memories.
Its function is:Export the data of collection.
2nd, test method
By taking clay as an example, chemical solution is carried out non-full the present embodiment using the NaCl solution of 0.1mol and L using the present invention Temperature, waterpower, the process of mechanics and chemical Coupling triaxial test with soil are:
1. the preparation of soil sample and installation
Soil sample 0 can use undisturbed or reinvent sample, be the standard size of triaxial test soil sample:Diameter 39.1cm, height It is 8cm;Pottery clay plates 1.5 and pipeline on the base 1.6 of triaxial cell 1 are carried out into saturation;Then the soil sample 0 that will be prepared is put Enter in rubber membrane, be compacted be placed on together to exclude the air in film on the pottery clay plates 1.5 of saturation slightly, the top of soil sample 0 is placed many Orifice plate 1.9, is then distinguished the upper and lower ends of rubber membrane (rubber membrane upper and lower ends are longer than the upper and lower ends of soil sample) with elastic string Tighten on the base 1.6 of triaxial cell and on porous plate 1.9;Then balancing gate pit's outer cover 1.1 is fixed on base 1.6, The water filling toward triaxial cell 1 is until be full of, period opens the air that vent 1.2 excludes interior;When water is completely filled with three During axle balancing gate pit, vent 1.2 is closed;
2. chemical solution is prepared
According to test requirements document, it is the NaCl solution of 0.1mol and l to use distilled water and the pure NaCl compound concentrations of analysis;Start The osmotic pressure and fixing fabric structure device 6.1 of chemical solution circulation permeation unit 6 are by chemical solution injecting controller;
3. test
A, the soil-water characteristic curve for determining different chemical solutions, different temperatures, different confined pressures and axle pressure unsaturated soil
Start chemical solution circulation permeation unit 6, open chemical solution valve 6.2, start osmotic pressure and fixing fabric structure By the pressure or flow value of setting be injected into soil sample 0 chemical solution in controller by device 6.1;Then matric suction is opened to apply Plus the hole penstock 4.5 of unit 4, start pore pressure and fixing fabric structure device 4.4, the hole in the soil sample 0 that chemical solution is displaced Gap solution is flowed into the pore pressure of matric suction applying unit 4 and fixing fabric structure device 4.4;Repeat said process 3 times, then take stream The chemical solution for going out soil sample carries out water analysis, when concentration is 0.1mol and l, that is, thinks that the replacement process of chemical solution is complete Into, be then shut off chemical solution circulation permeation unit 6;
Required temperature is set by temperature control unit 5, is applied by confined pressure and body is become monitoring unit 2, axle power and applies Plus unit 3 applies the confined pressure and axle pressure of setting;Needed for the pore pressure of matric suction applying unit 4 and fixing fabric structure device 4.4 are set The pore water pressure force value wanted, then starts gas pressure regulator 4.1 and applies required pore air pressure value;Hole in soil sample 0 Solution is flowed out in pore pressure and fixing fabric structure device 4.4 under the influence of air pressure, when discharge is constant, that is, is thought in the grade matrix Under suction (pore air pressure subtracts pore water pressure) effect, soil sample 0 reaches poised state, by the initial water content of soil sample 0 And discharge obtains the water content of this grade matrix suction of correspondence;Then apply next stage air pressure, repeat above-mentioned experiment, draw The dehumidification soil-water characteristic curve of unsaturated soil;When the matric suction of soil sample 0 is larger, air pressure is reduced step by step, then soil sample 0 is from pore pressure Chemical solution is sucked with fixing fabric structure device 4.4, moisture absorption soil-water characteristic curve is drawn;Above-mentioned desorption wet test is repeated, is then obtained Scan line in soil-water characteristic curve hysteresis circle;The equipment is applied by confined pressure and body change monitoring unit 2 obtains soil sample 0 and exists simultaneously Body in whole process of the test becomes;
Permeation unit 6, temperature control unit 5, confined pressure are circulated by chemical solution to apply and body change monitoring unit 2 and axle power Applying unit 3, sets chemical load, temperature, confined pressure and the axle pressure of next stage, repeats above-mentioned process of the test, draws soil sample 0 The complete soil-water characteristic curve under the effect of chemistry, temperature and Coupling with Mechanics.
B, determine different chemical solutions, different temperatures, different substrates suction and under confined pressure three axle drainings of unsaturated soil and Undrained shear is tested
The chemical load for applying setting similar with a experiments first, after the completion of waiting chemical solution to replace, applies the confined pressure of setting And temperature;Then apply the matric suction of setting, after soil sample 0 is issued to poised state in the matric suction, carry out unsaturation Three axle drainings of soil and disdrainage test;
Three axle not drainings of unsaturated soil are cut soon:When soil sample 0 reaches balance in confined pressure and matric suction, axial displacement is visited Meter 7.2 and the upper contact of triaxial cell 1 are surveyed, displacement dial gauge 7.1 resets;Hole penstock 4.5 is closed, then soil sample 0 is not arranged Water;Firing test machine 3.4, lifting platform 3.1 rises, and undrained quick shear test is carried out to soil sample 0;Shear strain rate is according to difference Soil property setting, can refer to normal triaxial;Applied by confined pressure and body becomes monitoring unit 2 and obtains soil sample 0 in process of the test Volume Changes, are surveyed by the pore water pressure sensor 8.7 in the pore pressure and fixing fabric structure device 4.4 of matric suction applying unit 4 Measure the situation of change of process of the test Pore Pressure;Become by the Real-time Collection axle power of data acquisition unit 8, axial displacement, body And pore water pressure;Then apply next stage confined pressure, repeat process above, obtain the not draining of unsaturated soil under 4 confined pressures Shearing strength curve;
Three axle drained shear tests of unsaturated soil:When soil sample 0 setting confined pressure and matric suction effect be issued to it is flat During weighing apparatus, axial displacement surveymeter 7.2 and the upper contact of triaxial cell 1, displacement dial gauge 7.1 reset;Firing test machine 3.4, Lifting platform 3.1 rises, and drained shear test is carried out to soil sample 0;Shear strain rate sets according to different soil properties, can refer to often Advise three axles;Applied by confined pressure and body becomes monitoring unit 2 and obtains Volume Changes of the soil sample 0 in process of the test, inhaled by matrix In the measurement process of the test of hole water flow sensor 8.8 in the pore pressure and fixing fabric structure device 4.4 of power applying unit 4 in soil sample 0 The suction and discharge of pore solution;Become and the inner pore of soil sample 0 by the Real-time Collection axle power of data acquisition unit 8, axial displacement, body The flow of solution;Then apply next stage confined pressure, repeat process above, obtain the draining shearing resistance of unsaturated soil under 4 confined pressures Intensity curve;
Permeation unit 6, temperature control unit 5, matric suction applying unit 4 are circulated by chemical solution, next stage is set Chemical load, temperature, matric suction, repeat above-mentioned process of the test, obtain non-full under chemistry, temperature and hydraulic coupling action Deformation and strength characteristic with soil.
C, the mechanics of measure chemical solution circulation change and the lower unsaturated soil of temperature cycles change and hydraulic characteristic Change
Similar a experiments and b experiments, at a constant temperature, soil sample 0 experiences the circulation change of chemical solution, then carries out Soil-water characteristic curve is tested and triaxial shear test, measures influence rule of the chemical load to unsaturated soils theory and hydraulic characteristic Rule;
Similar a experiments and b experiments, under constant chemical load action, soil sample 0 experiences the circulation change of temperature, then Soil-water characteristic curve experiment and triaxial shear test are carried out, influence rule of the temperature to unsaturated soils theory and hydraulic characteristic are measured Rule;
Because temperature control unit 5 and chemical solution circulation permeation unit 6 with independent control, therefore can realize temperature Under chemical load alternating action, the mechanics of unsaturated soil and the situation of change of hydraulic characteristic.
Chemosensitivity assays under d, different stress and matric suction effect
Similar a experiments and b experiments, soil sample 0 apply chemistry after the stress and matric suction load path of experience setting Load, then carrying out triaxial shear test, draws the change of under different stress and matric suction effect intensity with chemical action Law.
Present apparatus temperature, waterpower, mechanics and chemical load with independent control and applying, therefore can in any combination be gone up Four kinds of loads are stated, the test of unsaturated soil temperature, waterpower, mechanics and chemical Coupling behavioral trait is carried out.

Claims (2)

1. a kind of triaxial test system of unsaturated soil multi- scenarios method, it is characterised in that:
Apply including triaxial cell (1), confined pressure and body becomes monitoring unit (2), axle power applying unit (3), matric suction and applies Unit (4), temperature control unit (5), chemical solution circulate permeation unit (6), axial displacement measuring unit (7) and data acquisition Unit (8);
Its annexation is:
Soil sample (0) is provided with triaxial cell (1);
Confined pressure applies and body becomes monitoring unit (2), axle power applying unit (3), matric suction applying unit (4), temperature control list First (5), chemical solution circulate permeation unit (6) and axial displacement measuring unit (7) is connected with triaxial cell (1) respectively, real Now apply every load of setting to soil sample (0);
Data acquisition unit (8) applies with confined pressure respectively and body becomes monitoring unit (2), axle power applying unit (3), matric suction and applies It is real plus unit (4), temperature control unit (5), chemical solution circulate permeation unit (6) and axial displacement measuring unit (7) connection The now collection of each item data;
Described triaxial cell (1) includes balancing gate pit's outer cover (1.1), exhaust passage (1.2), confined pressure duct (1.3), chemical solution Fluid apertures road (1.4), pottery clay plates (1.5), base (1.6), hole stomata road (1.7), pore water duct (1.8) and porous plate (1.9);
Its annexation is:
On base (1.6), pottery clay plates (1.5) are placed on base (1.6) middle part to balancing gate pit's outer cover (1.1), in pottery clay plates (1.5) top is placed with soil sample (0), and exhaust passage (1.2) are arranged on balancing gate pit's outer cover (1.1) top, for pressure release Indoor air;
Confined pressure duct (1.3) is arranged on the edge of base (1.6), for applying confined pressure;
Chemical solution duct (1.4) is arranged on the edge of base (1.6), and the porous plate (1.9) on soil sample (0) top is connected, For the circulation infiltration of chemical solution;
Hole stomata road (1.7) is arranged on the edge of base (1.6), and the porous plate (1.9) on soil sample (0) top is connected, and is used To apply air pressure to soil sample (0);
Pore water duct (1.8) is arranged on the center of base (1.6), and in the lower section of pottery clay plates (1.5), One function is to soil Sample (0) applies pore water pressure, and another function is permeated for carrying out the circulation of chemical solution to soil sample (0);
Described confined pressure applies and body becomes monitoring unit (2) and includes confined pressure and fixing fabric structure device (2.1) and confined pressure valve (2.2);
Its annexation is:
Confined pressure and fixing fabric structure device (2.1) and confined pressure valve (2.2) are connected, the confined pressure hole of confined pressure valve (2.2) and triaxial cell (1) Road (1.3) is connected;
Confined pressure and fixing fabric structure device (2.1) are connected by signal transmssion line and data acquisition unit (8), to soil sample (0) in experiment During confined pressure and body become be acquired;
Described axle power applying unit (3) includes lifting platform (3.1), handwheel (3.2), axial dynamometer (3.3) and testing machine (3.4);
Its annexation is:
From top to bottom, testing machine (3.4), lifting platform (3.1), triaxial cell (1) and axial dynamometer (3.3) are sequentially connected, Apply axle power to soil sample (0);
Handwheel (3.2) is provided with testing machine (3.4), plays unloading;
Axial dynamometer (3.3) is connected by signal transmssion line and data acquisition unit (8), to soil sample (0) in process of the test Axle power be acquired;
Described matric suction applying unit (4) including gas pressure regulator (4.1), air compressor machine (4.2), hole air valve (4.3), Pore pressure and fixing fabric structure device (4.4) and hole penstock (4.5);
Its annexation is:
Air compressor machine (4.2), gas pressure regulator (4.1) and hole air valve (4.3) are sequentially connected, hole air valve (4.3) and three Hole stomata road (1.7) connection of axle balancing gate pit (1), pore air pressure is applied to soil sample (0);
Pore pressure and fixing fabric structure device (4.4) and hole penstock (4.5) connection, hole penstock (4.5) and triaxial cell (1) Pore water duct (1.8) connection, pore water pressure is applied to soil sample (0), while suction or being discharged in monitoring soil sample (0) The flow of pore solution, and then draw the situation of change of soil sample (0) water content;
Gas pressure regulator (4.1) and pore pressure and fixing fabric structure device are connected by signal transmssion line and data acquisition unit (8), to soil The collection of pore air pressure, pore water pressure and change of moisture content in sample (0) process of the test;
Described temperature control unit (5) includes resistance wire (5.1), cryogenic thermostat cryostat (5.2), cryostat liquid circulation copper pipe And temperature controller (5.4) (5.3);
Its annexation is:
Resistance wire (5.1) and cryostat liquid circulate copper pipe (5.3) and are respectively placed on the inwall of triaxial cell's outer cover (1.1), low temperature Thermostated cooling bath (5.2) and cryostat liquid circulate copper pipe (5.3) connection, and resistance wire (5.1) and cryogenic thermostat cryostat (5.2) are respectively and warm Degree controller (5.4) connection, controls temperature;
Temperature controller (5.4) is connected by signal transmssion line and data acquisition unit (8), to soil sample (0) in process of the test Temperature be acquired;
Described chemical solution circulates permeation unit (6) includes osmotic pressure and fixing fabric structure device (6.1) and chemical solution valve (6.2);
Its annexation is:
Osmotic pressure and fixing fabric structure device (6.1) and chemical solution valve (6.2) connection, chemical solution valve (6.2) and three axles Chemical solution duct (1.4) connection in balancing gate pit (1);
Osmotic pressure and fixing fabric structure device (6.1) are connected by signal transmssion line and data acquisition unit (8), and soil sample (0) is tried Osmotic pressure and flow during testing are acquired;
Described axial displacement measuring unit (7) includes axial displacement dial gauge (7.1) and displacement surveymeter (7.2);
Its annexation is:
The top connection of axial displacement dial gauge (7.1) and displacement surveymeter (7.2), displacement surveymeter (7.2) and triaxial pressure Room (1) upper contact, axial displacement dial gauge (7.1) is connected by signal transmssion line and data acquisition unit (8), to soil sample (0) axial displacement in process of the test is acquired;
Described data acquisition unit (8) includes confined pressure sensor (8.1), flow sensor (8.2), chemical solution pressure sensing Device (8.3), chemical solution flow sensor (8.4), axial force sensor (8.5), pore air pressure sensor (8.6), pore water Pressure sensor (8.7), hole water flow sensor (8.8), temperature sensor (8.9), shaft position sensor (8.10), number According to Acquisition Instrument (8.11) and computer (8.12);
Its annexation is:
Have on data collecting instrument (8.11) 10 passages respectively with confined pressure sensor (8.1), flow sensor (8.2), chemical solution Hydraulic pressure force snesor (8.3), chemical solution flow sensor (8.4), axial force sensor (8.5), pore air pressure sensor (8.6), pore water pressure sensor (8.7), hole water flow sensor (8.8), temperature sensor (8.9) and axial displacement are passed Sensor (8.10) is connected, and data collecting instrument (8.11) and computer (8.12) are connected;
Confined pressure sensor (8.1) and flow sensor (8.2) are arranged at confined pressure and apply to become the confined pressure and body of monitoring unit (2) with body On plot controller (2.1);
It is single that chemical solution pressure sensor (8.3) and chemical solution flow sensor (8.4) are arranged at chemical solution circulation infiltration In the osmotic pressure and fixing fabric structure device (6.1) of first (6);
Axial force sensor (8.5) is arranged on axial dynamometer (3.3);
Pore air pressure sensor (8.6) is arranged on gas pressure regulator (4.1);
Pore water pressure sensor (8.7) and hole water flow sensor (8.8) are arranged at the hole of matric suction applying unit (4) In pressure and fixing fabric structure device (4.3);
Temperature sensor (8.9) is arranged on temperature controller (5.4);
Shaft position sensor (8.10) is arranged on axial displacement dial gauge (7.1).
2. the test method of triaxial test system described in claim 1 is based on, it is characterised in that comprised the following steps:
1. the preparation and installation of soil sample
Soil sample (0) can use undisturbed or reinvent sample, and the pottery clay plates (1.5) on triaxial cell (1) base (1.6) are carried out Saturation;Then the soil sample (0) that will be prepared is inserted in rubber membrane, is compacted, to exclude the air in film, saturation is placed on together slightly Pottery clay plates (1.5) on, porous plate (1.9) is placed on soil sample (0) top, is then distinguished the upper and lower ends of rubber membrane with elastic string Tighten on the base (1.6) of triaxial cell (1) and on porous plate (1.9), rubber membrane upper and lower ends are longer than the upper and lower of soil sample Two ends;
2. chemical solution is prepared
According to test requirements document, chemical solution is prepared according to required concentration and component;Start chemical solution and circulate permeation unit (6) Osmotic pressure and fixing fabric structure device (6.1) by chemical solution injecting controller;
3. test
A, the soil-water characteristic curve for determining different chemical solutions, different temperatures, different confined pressures and axle pressure unsaturated soil;
B, determine different chemical solutions, different temperatures, different substrates suction and three axle drainings of unsaturated soil and do not arranged under confined pressure Water shearing test;
The change of the mechanics and hydraulic characteristic of c, measure chemical solution circulation change and the lower unsaturated soil of temperature cycles change;
D, different stress and lower sensitivity analysis of the unsaturated soil to chemistry and temperature of matric suction effect.
CN201510409634.7A 2015-07-14 2015-07-14 The triaxial test system and method for unsaturated soil multi- scenarios method CN104964878B (en)

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