CN102401778A - Device and method for measuring swelling representation parameters of swelling soil - Google Patents
Device and method for measuring swelling representation parameters of swelling soil Download PDFInfo
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- CN102401778A CN102401778A CN2011100991867A CN201110099186A CN102401778A CN 102401778 A CN102401778 A CN 102401778A CN 2011100991867 A CN2011100991867 A CN 2011100991867A CN 201110099186 A CN201110099186 A CN 201110099186A CN 102401778 A CN102401778 A CN 102401778A
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Abstract
The invention discloses a device and method for measuring swelling representation parameters of swelling soil. The device for measuring the swelling representation parameters of the swelling soil comprises a sample container, a soil body permeation coefficient measurement part, a jacking cylinder applying a vertical load, a dial indicator for testing a swelling soil sample to generate vertical deformation, and a deformation pipe used for testing water seepage coefficients of the swelling soil. The method comprises the steps of: immersing the swelling soil sample into water for swelling stably, measuring the water seepage coefficients; and then electrically heating the swelling soil sample to ensure that the swelling soil sample is dehydrated and contracted stably, and measuring the permeation coefficients of the swelling soil. Therefore, the invention can be used for measuring water seepage and permeation coefficients of the swelling soil in a repeatedly-swelling deformation process by controlling temperature and water content changes of the swelling soil sample in the sample container so as to reflect the change of a fracture and a soil body structure inside the soil body of the swelling soil in the repeatedly-swelling deformation process. In addition, the sample container of the device is connected with an external pipeline through each joint arranged on the sample container, therefore, data measurement in an experiment process is facilitated, and measurement precision of data is increased.
Description
Technical field
The present invention relates to a kind of measurement mechanism of swelled ground breathing characterization parameter and measure the method for infiltration and permeation coefficient in the swelled ground repeated expansion and shrinkage deformation process, be used to test swelled ground repeated expansion and shrinkage characteristic under vertical uniform load q; Belong to civil engineering work subject Geotechnical Engineering technical field of measurement and test.
Background technology
Swelled ground is a kind of the have many cracks and remarkable singularity clay of swell-shrink characteristics, has many fissurities, water-swellable, dehydration shrinkage cracking and changes engineering propertiess such as producing the repeated expansion and shrinkage distortion with water percentage.Swelled ground distributes all extremely extensive in China and even worldwide, and many engineering accidents of swelled ground area all are because the swell-shrinking deformation of swelled ground causes like building collapse, subgrade heave, side slope unstability etc.And to study the swell-shrinking deformation characteristic of swelled ground, need carry out the breathing test of swelled ground under different vertical uniform load q.The test of research swelled ground swell-shrink characteristics at present has: no load swelling rate test, load swelling rate test and shrinkage test are arranged.No load swelling rate test is the sample of in dilatometer, packing into, and the soil body produces and expands after the water filling.It is the sample of in consolidometer, packing into that the load swelling rate test is arranged, and applies vertical load then and makes soil body compression, and the soil body produces and expands after the water filling.Shrinkage test is to adopt retractometer to make the soil body air-dry under field conditions (factors), thereby produces drawdown deformation.These three kinds of test methods and instrument are simple and convenient, but have significant disadvantage: the test of single swelling property or shrinkability can only be carried out in (1), can not expand, the reciprocal deformation test of contraction cycles; (2) can only measure the vertical deformation amount of the soil body, test findings also can't reflect the situation of change of inside soil body crack and structure.
Summary of the invention
The present invention is directed to the deficiency of prior art; A kind of measurement mechanism of swelled ground breathing characterization parameter is provided; It can place the temperature and the water percentage of the swelled ground of sample tank to change through control; With infiltration and the permeation coefficient that determines swelled ground repeated expansion and shrinkage deformation process, thereby reflect the crack of swelled ground inside soil body in the repeated expansion and shrinkage deformation process and the variation of soil structures.
For realizing above technical purpose, the present invention will take following technical scheme:
A kind of measurement mechanism of swelled ground breathing characterization parameter comprises frame and sample receiver, and said sample receiver comprises the sample tank, settles retaining ring in the said sample tank, and supports cutting ring through the following permeable stone that is installed in sample tank bottom surface in the retaining ring; The outside surface of said down permeable stone, cutting ring is tightly connected with the internal face of retaining ring respectively; The swelled ground sample is installed in the said cutting ring, and the top of swelled ground sample is connected with force transmitting board through installing permeable stone; The top of said retaining ring is provided with lead ring, and the joint face between lead ring and retaining ring, upper dankness stone and the force transmitting board seals all respectively; Jacking cylinder and dial gauge are installed respectively on the said frame; The piston rod of jacking cylinder contacts with the sample bottom of gullet, and the measuring staff of dial gauge is connected with force transmitting board; The bottom of said sample tank is installed tank water inlet pipe and tank draft tube respectively, and the joint that the tank water inlet pipe is installed through its end is connected with the water source, and the tank draft tube then is connected with source of the gas through the joint that install its end; Force transmitting board then install respectively the sample escape pipe with the sample rising pipe, and the joint that the sample escape pipe is installed through its end is connected with soil body permeation volume measuring device; The outside surface of retaining ring is installed electric heater, and the temperature sensor of said electric heater is placed in the thermometer hole that runs through force transmitting board and upper dankness stone.
Said soil body permeation volume measuring device comprises uncovered organic glass cylinder and the piston that is tightly connected with the wall of this uncovered organic glass cylinder; The wall of said uncovered organic glass cylinder is respectively arranged with gas outlet that is connected with gas outlet and the air intake opening that is connected with the sample escape pipe; The bottom surface that said air intake opening and gas outlet nestle up uncovered organic glass cylinder all respectively is provided with; On the said gas outlet rain glass is installed, and mounted valve on the connecting tube between the exhausr port of rain glass and gas outlet.
Said tank water inlet pipe also becomes the water delivering orifice of managing with body and is connected, and the air intake opening that this body becomes pipe is connected with source of the gas.
Said electric heater comprises power supply, temperature controller, temperature sensor and electric heating sheets; Electric heating sheets is placed in the outside surface of retaining ring, and electric heating sheets is connected with power supply through temperature controller, and temperature sensor then is connected with temperature controller; Said temperature controller is controlled the break-make between power supply and the electric heating sheets through the temperature information that temperature sensor fed back.
Said frame comprises base plate, crossbeam and the pull bar that base plate is connected with crossbeam through locknut.
Another technical purpose of the present invention provides the assay method that a kind of measurement mechanism of above-mentioned swelled ground breathing characterization parameter carries out swelled ground breathing, and may further comprise the steps: the swelled ground sample is installed in (1) in sample receiver; (2) through cylinder the swelled ground sample is applied the normal pressure of setting, treat that the stable back of sample deformation measures its deflection; (3), treat that the sample stable back of expanding measures its dilatational strain amount to the saturated expansion of seeping water of swelled ground sample; (4) infiltration coefficient that carries out the swelled ground sample is measured; (5) keeping again the swelled ground sample after the aforementioned infiltration expansion being carried out electrical heating under the constant situation of normal pressure, make it that dehydration take place and shrink, after the swelled ground sample reaches predetermined water percentage, measure its drawdown deformation amount; (6) at the permeation coefficient determination that keeps carrying out under the constant situation of normal pressure the swelled ground sample; (7) repeatedly the swelled ground sample is carried out the operation of step (3), (4), (5) and step (6); Measure dilatational strain amount and drawdown deformation amount after infiltration coefficient and the dehydration and permeation coefficient after each immersion is expanded, reflect the development and the structural change situation of sample internal crack through the variation of infiltration coefficient and permeation coefficient.
Said infiltration is expanded and is specially: earlier the swelled ground sample is applied vertical load; The swelled ground sample is applied on the basis of vertical load keeping then, from the bottom water filling of swelled ground sample, cause the swelled ground sample to expand distortion, to carry out the mensuration of swelled ground sample infiltration coefficient.
Said step (5) is specially: under keeping the constant situation of normal pressure, let the water in the swelled ground sample under action of gravity, discharge, simultaneously the swelled ground sample is carried out electrical heating, the control temperature is at 30-40 ℃, lets the water in the swelled ground sample evaporate discharge; In addition; In heating process that the swelled ground sample is switched on, measure the quality of swelled ground sample at any time, to calculate the water percentage change procedure of swelled ground sample; After the water percentage of swelled ground sample reaches the water percentage lower limit of setting; Stop the swelled ground sample is heated, let the air permeation swelled ground sample of constant pressure, measure the permeation coefficient of swelled ground sample.
According to above technical scheme, can realize following beneficial effect:
(1) joint of pipeline all adopts the quick detachable joint of band valve, and after the joint of pipeline was removed, sample receiver became an independent parts, is convenient to the total quality of measuring vessel and sample, obtains the sample water percentage of any time in process of the test; (2) during the quality of measuring vessel and sample, the vertical pressure on the sample can not change at short notice, thereby has eliminated the influence that unloading produces sample deformation.(3) in the sample contraction process,, quicken the evaporation of sample internal moisture, reduce the required time of shrinkage test through the electric heating sheets heating; The temperature of sample heating simultaneously is controlled, guarantees that the sample dehydration is even basically.(4) the O-ring seal sealing is adopted in contact place between force transmitting board, lead ring, retaining ring, cutting ring, the tank, and thermometer hole adopts sealable screw simultaneously, and sample receiver has formed a complete sealed space, guarantees to measure the accuracy of infiltration and permeation coefficient.
Advantage of the present invention and effect are: (1) adopts infiltration and two physical quantitys of permeation coefficient to come to reflect indirectly the situation of change of swelled ground inside soil body crack and structure in the swell-shrinking deformation process.(2) adopt air pressure to apply vertical load, vertical load remains constantly in the process of the test, and sample receiver can be disassembled into an independent parts simultaneously, is convenient for measuring its quality, has eliminated the influence that unloading produces soil deformation.(3) adopt temperature controller and electric heating sheets control specimen temperature to change within the specific limits, quicken the evaporation of sample internal moisture, shorten test period.
Description of drawings
Fig. 1 is the structural representation of the measurement mechanism of swelled ground breathing characterization parameter according to the invention;
Among Fig. 1: sample tank 1; Tank draft tube 11; Tank water inlet pipe 12; Sample escape pipe 13; Sample rising pipe 14; Sample thermometer hole 15; Lead ring 16; Force transmitting board 17; Retaining ring 18; Cutting ring 19; Base plate 21; Pull bar 22; Crossbeam 23; Jacking cylinder 31; Cylinder gas piping 32; Following porous disc 41; Last porous disc 42; Body becomes pipe 5; Dial gauge 61; Dial gauge measuring staff 62; Temperature sensor 71; Temperature controller 72; Electric heating sheets 73; Uncovered organic glass cylinder 81; Piston 82; Rain glass 83; Quick detachable joint 9; O-ring seal 10;
Label A, B, C, D, E, F, G, H, I are all valve.
Embodiment
Accompanying drawing discloses the structural representation of preferred embodiment involved in the present invention without limitation, below will combine accompanying drawing that technical scheme of the present invention at length is described.
As shown in Figure 1; The measurement mechanism of swelled ground breathing characterization parameter of the present invention; Comprise frame and sample receiver, frame of broken lines partly is sample receiver among the figure, and said sample receiver comprises the sample tank; Settle retaining ring in the said sample tank, and support cutting ring through the following permeable stone that is laid on sample tank bottom surface in the retaining ring; The outside surface of said down permeable stone, cutting ring is tightly connected with the internal face of retaining ring respectively; The swelled ground sample is installed in the said cutting ring, and the top of swelled ground sample is connected with force transmitting board through installing permeable stone; The top of said retaining ring is provided with lead ring, and the joint face between lead ring and retaining ring, upper dankness stone and the force transmitting board seals all respectively; Jacking cylinder and dial gauge are installed respectively on the said frame; The piston rod of jacking cylinder contacts with the sample bottom of gullet, and the measuring staff of dial gauge is connected with force transmitting board; The bottom of said sample tank is installed tank water inlet pipe and tank draft tube respectively, and the joint that the tank water inlet pipe is installed through its end is connected with the water source, and the tank draft tube then is connected with source of the gas through the joint that install its end; Force transmitting board then install respectively the sample escape pipe with the sample rising pipe, and the joint that the sample escape pipe is installed through its end is connected with soil body permeation volume measuring device; The outside surface of retaining ring is installed electric heater, and the temperature sensor of said electric heater is placed in the thermometer hole that runs through force transmitting board and upper dankness stone.Said frame comprises base plate, crossbeam and the pull bar that base plate is connected with crossbeam through locknut.The jacking cylinder is installed on the base plate, and dial gauge then is installed on the crossbeam, and dial gauge is positioned at the top of sample tank, and the jacking cylinder then is positioned at sample tank below, determines the expansion and the drawdown deformation amount of swelled ground sample through dial gauge.
The O-ring seal sealing is all adopted in contact place among the figure between force transmitting board, lead ring, retaining ring, cutting ring, the tank, and thermometer hole adopts sealable screw, and sample receiver has formed a complete sealed space.External water source, sample receiver bottom, source of the gas and body become pipe, and thermometer hole, water delivering orifice and gas outlet are left in top, the external soil body permeation volume measuring device of sealing fully in gas outlet.This soil body permeation volume measuring device comprises the organic glass container of sealing fully; Form by uncovered organic glass cylinder and with the piston that the wall of this uncovered organic glass cylinder is tightly connected; Piston can move freely on uncovered organic glass cylinder top; And the friction between piston and the chamber wall is very little, and the pressure that rain glass is measured gas in the container is housed simultaneously.Electric heating sheets, sensor link to each other with temperature controller, and the temperature in the temperature controller control process of the test changes within the specific limits.The gas outlet that links to each other with sample receiver, water source, source of the gas and power lug are quick detachable joint, and sample receiver can become an independent parts.The wall of said uncovered organic glass cylinder is respectively arranged with gas outlet that is connected with gas outlet and the air intake opening that is connected with the sample escape pipe; The bottom surface that said air intake opening and gas outlet nestle up uncovered organic glass cylinder all respectively is provided with; On the said gas outlet rain glass is installed, and mounted valve on the connecting tube between the exhausr port of rain glass and gas outlet.Said tank water inlet pipe also becomes the water delivering orifice of managing with body and is connected, and the air intake opening that this body becomes pipe is connected with source of the gas.Said electric heater comprises power supply, temperature controller, temperature sensor and electric heating sheets; Electric heating sheets is placed in the outside surface of retaining ring, and electric heating sheets is connected with power supply through temperature controller, and temperature sensor then is connected with temperature controller; Said temperature controller is controlled the break-make between power supply and the electric heating sheets through the temperature information that temperature sensor fed back.
As shown in Figure 2, it discloses the mounting arrangement figure of each valve of the present invention; Wherein: valve A is installed on the gas outlet of uncovered organic glass cylinder; Valve B is installed on the connecting tube between sample escape pipe and the uncovered organic glass cylinder; Valve C is installed on the sample rising pipe; Valve D is installed in source of the gas and body becomes on the connecting tube between the pipe; Valve E, valve F are installed in water source and body respectively and become on the connecting tube between the pipe, and valve E becomes the water delivering orifice setting of pipe near body, and valve F is then near the water delivering orifice setting at water source; Valve I is installed on the tank water inlet pipe; Valve H then is installed on the tank draft tube; Valve G is installed on the connecting tube of source of the gas and cylinder; When sample receiver and body are become pipe, source of the gas, water source and soil body permeation volume measuring device and break off, can keep cylinder that the sample tank is applied constant vertical load.
Another technical purpose of the present invention provides the assay method that a kind of measurement mechanism of above-mentioned swelled ground breathing characterization parameter carries out swelled ground breathing, and may further comprise the steps: the swelled ground sample is installed in (1) in sample receiver; (2) through cylinder the swelled ground sample is applied the normal pressure of setting, treat that the stable back of sample deformation measures its deflection; (3), treat that the sample stable back of expanding measures its dilatational strain amount to the saturated expansion of seeping water of swelled ground sample; (4) infiltration coefficient that carries out the swelled ground sample is measured; (5) keeping again the swelled ground sample after the aforementioned infiltration expansion being carried out electrical heating under the constant situation of normal pressure, make it that dehydration take place and shrink, after the swelled ground sample reaches predetermined water percentage, measure its drawdown deformation amount; (6) at the permeation coefficient determination that keeps carrying out under the constant situation of normal pressure the swelled ground sample; (7) repeatedly the swelled ground sample is carried out the operation of step (3), (4), (5) and step (6); Measure dilatational strain amount and drawdown deformation amount after infiltration coefficient and the dehydration and permeation coefficient after each immersion is expanded, reflect the development and the structural change situation of sample internal crack through the variation of infiltration coefficient and permeation coefficient.
The experimentation of the measurement mechanism of above-mentioned swelled ground breathing characterization parameter is:
(1) begins to carry out the pipeline exhaust before the test, open valve E and valve F, close other all valves, connect the water source, body is become in the pipe be filled with a certain amount of water, afterwards valve-off F, E.
When (2) testing; In sample receiver, install sample; And break off being connected of sample receiver and external pipe through quick detachable joint, be about to sample receiver and become pipe, source of the gas, water source and the soil body with body and shrink the disconnection of air pressure analyzer, the total quality of mensuration sample receiver.
(3) through quick detachable joint sample receiver is connected with external pipe, promptly sample receiver is connected with body change pipe, source of the gas, water source and soil body permeation volume measuring device, opens valve G, connects source of the gas B, regulates air pressure pressure regulation tube applies setting to sample vertical load.Treat that sample is stablized under load action after, measure the vertical deformation amount of sample through dial gauge.
(4) open valve F, I, connect the water source, make sample saturated for gradually the interior fills with water of sample receiver from bottom to top, afterwards valve-off F, I.After treating that sample immersion expansion is stable, measure the vertical deformation amount of sample through dial gauge.
(5) open valve F, I, get rid of unnecessary water in the sample receiver; Valve-off F, I, G through air pressure pressure regulation tube removal air pressure, and break off being connected of sample receiver and external pipe through quick detachable joint, measure the total quality of sample receiver, calculate the sample immersion water percentage after stablizing that expands.
(6) connect sample receiver and external pipe through quick detachable joint, transfer to the vertical load of setting, open valve G through air pressure pressure regulation tube; Valve-off H, F, B open valve E, I, D, C, and connecting has pressurized air source A; Through air pressure pressure regulation tube body is become the pressure that the interior water of pipe applies setting; Then the water in the body change pipe flows out from water delivering orifice through sample, when treating that water delivering orifice there are flowing out, picks up counting; And write down the variation that body becomes the water yield in the pipe, calculate the infiltration coefficient of sample after immersion expansion under the specific load action is stable with this.If the infiltration coefficient of sample has exceeded body more greatly when becoming the measurement range of pipe, can valve-off E, open valve F, I, measure the infiltration coefficient of sample through external water source.
(7) behind the infiltration coefficient of intact sample to be determined, valve-off I opens valve C, B; Turn on the nut at thermometer hole place, in thermometer hole, insert temperature sensor, set the bound of heating-up temperature through temperature controller; Connect external power supply; Electric heating sheets is started working, and the inner moisture of sample is discharged, and sample produces and shrinks.
(8) when the water percentage of estimating sample reaches the setting water percentage; Measure the drawdown deformation amount of sample through dial gauge; Valve-off G through air pressure pressure regulation tube removal air pressure, and breaks off being connected of sample receiver and external pipe through quick detachable joint; Measure the total quality of sample receiver, calculate the water percentage after the sample dehydration is shunk.
(9) connect sample receiver and external pipe through quick detachable joint, transfer to the vertical load of setting, open valve G, H, B, A through air pressure pressure regulation tube; Valve-off E, I, D, C; Connection is circumscribed with pressurized air source A, transfers to the pressure of setting through the pressure regulation tube, then has the gas in the pressurized air source to penetrate into the organic glass container through sample; When exhausr port has gas to discharge; Valve-off A also picks up counting, and height and barometric reading that recording and analyses rises calculate the permeation coefficient of sample after dehydration under the specific load action is stable with this.
So far accomplish swell-shrinking deformation and a measurement of infiltration and permeation coefficient under the drying and watering cycle, carry out for the second time, for the third time repeating step (4)～(9) ... The measurement of swell-shrinking deformation under the drying and watering cycle and infiltration and permeation coefficient.
Claims (8)
1. the measurement mechanism of a swelled ground breathing characterization parameter comprises frame and sample receiver, and said sample receiver comprises the sample tank, settles retaining ring in the said sample tank, and supports cutting ring through the following permeable stone that is installed in sample tank bottom surface in the retaining ring; The outside surface of said down permeable stone, cutting ring is tightly connected with the internal face of retaining ring respectively; Dress swelled ground sample in the said cutting ring, and the top of swelled ground sample is connected with force transmitting board through installing permeable stone; The top of said retaining ring is provided with lead ring, and the joint face between lead ring and retaining ring, upper dankness stone and the force transmitting board seals all respectively; It is characterized in that: jacking cylinder and dial gauge are installed respectively on the said frame; The sample tank is supported on the piston rod of jacking cylinder; The measuring staff of dial gauge is connected with force transmitting board; The bottom of said sample tank is installed tank water inlet pipe and tank draft tube respectively, and the joint that the tank water inlet pipe is installed through its end is connected with the water source, and the joint that the tank draft tube is then passed through its end is connected with source of the gas; Force transmitting board then install respectively the sample escape pipe with the sample rising pipe, and the joint that the sample escape pipe is installed through its end is connected with soil body permeation volume measuring device; The outside surface of retaining ring is installed electric heater, and the temperature sensor of said electric heater is placed in the thermometer hole that runs through force transmitting board and upper dankness stone.
2. the measurement mechanism of swelled ground breathing characterization parameter according to claim 1; It is characterized in that: said soil body permeation volume measuring device comprises uncovered organic glass cylinder and the piston that is tightly connected with the wall of this uncovered organic glass cylinder; The wall of said uncovered organic glass cylinder is respectively arranged with gas outlet that is connected with gas outlet and the air intake opening that is connected with the sample escape pipe; The bottom surface that said air intake opening and gas outlet nestle up uncovered organic glass cylinder all respectively is provided with; On the said gas outlet rain glass is installed, and mounted valve on the connecting tube between the exhausr port of rain glass and gas outlet.
3. the measurement mechanism of swelled ground breathing characterization parameter according to claim 2 is characterized in that: said tank water inlet pipe also becomes the water delivering orifice of managing with body and is connected, and the air intake opening that this body becomes pipe is connected with source of the gas.
4. the measurement mechanism of swelled ground breathing characterization parameter according to claim 3 is characterized in that: said electric heater comprises power supply, temperature controller, temperature sensor and electric heating sheets; Electric heating sheets is placed in the outside surface of retaining ring, and electric heating sheets is connected with power supply through temperature controller, and temperature sensor then is connected with temperature controller; Said temperature controller is controlled the break-make between power supply and the electric heating sheets through the temperature information that temperature sensor fed back.
5. according to the measurement mechanism of the described swelled ground breathing of 1 to 4 arbitrary claim characterization parameter, it is characterized in that: said frame comprises base plate, crossbeam and the pull bar that base plate is connected with crossbeam through locknut.
6. the measurement mechanism of the said swelled ground breathing of claim 1 characterization parameter carries out the measuring method of swelled ground breathing characterization parameter, it is characterized in that, may further comprise the steps: the swelled ground sample is installed in (1) in sample receiver; (2) through cylinder the swelled ground sample is applied the normal pressure of setting, treat that the stable back of sample deformation measures its deflection; (3), treat that the sample stable back of expanding measures its dilatational strain amount to the saturated expansion of seeping water of swelled ground sample; (4) infiltration coefficient that carries out the swelled ground sample is measured; (5) keeping again the swelled ground sample after the aforementioned infiltration expansion being carried out electrical heating under the constant situation of normal pressure, make it that dehydration take place and shrink, after the swelled ground sample reaches predetermined water percentage, measure its drawdown deformation amount; (6) at the permeation coefficient determination that keeps carrying out under the constant situation of normal pressure the swelled ground sample; (7) repeatedly the swelled ground sample is carried out the operation of step (3), (4), (5) and step (6); Measure dilatational strain amount and drawdown deformation amount after infiltration coefficient and the dehydration and permeation coefficient after each immersion is expanded, reflect the development and the structural change situation of sample internal crack through the variation of infiltration coefficient and permeation coefficient.
7. the assay method that the measurement mechanism of swelled ground breathing characterization parameter according to claim 6 carries out swelled ground breathing is characterized in that, said infiltration is expanded and is specially: earlier the swelled ground sample is applied vertical load; The swelled ground sample is applied on the basis of vertical load keeping then, from the bottom water filling of swelled ground sample, cause the swelled ground sample to expand distortion, to carry out the mensuration of swelled ground sample infiltration coefficient.
8. the assay method that the measurement mechanism of swelled ground breathing characterization parameter according to claim 6 carries out swelled ground breathing; It is characterized in that; Said step (5) is specially: under keeping the constant situation of normal pressure, let the water in the swelled ground sample under action of gravity, discharge; Simultaneously the swelled ground sample is carried out electrical heating, the control temperature lets the interior water evaporation of swelled ground sample discharge at 30-40 ℃; In addition; In heating process that the swelled ground sample is switched on, measure the quality of swelled ground sample at any time, to calculate the water percentage change procedure of swelled ground sample; After the water percentage of swelled ground sample reaches the water percentage lower limit of setting; Stop the swelled ground sample is heated, let the air permeation swelled ground sample of constant pressure, measure the permeation coefficient of swelled ground sample.
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| CN 201110099186 CN102401778B (en) | 2011-04-20 | 2011-04-20 | Device and method for measuring swelling representation parameters of swelling soil |
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| CN 201110099186 CN102401778B (en) | 2011-04-20 | 2011-04-20 | Device and method for measuring swelling representation parameters of swelling soil |
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| CN102401778B CN102401778B (en) | 2013-10-30 |
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