CN105738255A - Testing device and method for permeation of slurry in soil layer - Google Patents

Testing device and method for permeation of slurry in soil layer Download PDF

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Publication number
CN105738255A
CN105738255A CN201610079708.XA CN201610079708A CN105738255A CN 105738255 A CN105738255 A CN 105738255A CN 201610079708 A CN201610079708 A CN 201610079708A CN 105738255 A CN105738255 A CN 105738255A
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CN
China
Prior art keywords
soil sample
mud
pressure
stratum
soil
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CN201610079708.XA
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Chinese (zh)
Inventor
王志华
乌效鸣
张轶
赵民
祝强
吴笛
魏林春
赵龙
李慕涵
胡宽
韦晨光
何昀
Original Assignee
上海隧道工程有限公司
中国地质大学(武汉)
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Application filed by 上海隧道工程有限公司, 中国地质大学(武汉) filed Critical 上海隧道工程有限公司
Priority to CN201610079708.XA priority Critical patent/CN105738255A/en
Publication of CN105738255A publication Critical patent/CN105738255A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/04Investigating osmotic effects
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample

Abstract

The invention relates to a testing device for permeation of slurry in a soil layer.The device comprises a soil sample holder, a first high-pressure air source, a slurry pipe, a second high-pressure air source and a leading-out pipe.A soil layer sample remodeled according to the pressure of a stratum where the stratum sample is located is clamped in the soil sample holder.The first high-pressure air source is connected with the soil sample holder and used for applying surrounding pressure to the soil sample holder.The slurry pipe is arranged in the soil sample holder and filled with slurry, the top end of the slurry pipe is of a sealed structure, the bottom end of the slurry pipe is of an open structure, and the bottom end of the slurry pipe is in contact with the upper surface of the stratum soil sample.The second high-pressure air source is connected with the top end of the slurry pipe and used for applying axial pressure to the slurry pipe.The leading-out pipe is connected to the end, corresponding to the lower surface of the stratum soil sample, of the soil sample holder and used for leading out slurry filter liquid permeating out of the stratum soil sample.The problem that the pressure borne by a sample is not considered in the prior art is solved, and a result measured through the testing device is more accurate and more reliable.

Description

Test device that mud permeates in soil layer and method of testing

Technical field

The present invention relates to slurry penetration field tests, refer in particular to test device and method of testing that a kind of mud permeates in soil layer.

Background technology

The stability keeping excavation hole (groove) is mud most important effect in the engineerings such as diaphram wall, cast-in-situ bored pile and slurry shield engineering method, is form mud skin by mud at surface of stratum so that the soil water pressure on mud pressure balance stratum.Wherein, the formation of mud skin is mud infiltration problem in the earth formation, but studies very few for the mud skin Forming Mechanism when two-dimensional pressure and penetration testing.

At present, for slurry penetration and film forming, but without special test instrunment.Existing document discloses: in order to simulate the process that mud infiltrates in the earth formation, and having made mud has pressure permeability apparatus.The main body of this device is transparent with machine glass cylinder, round diameter be 8.3cm earth pillar in first fill the evengranular filtering layer of 5cm, then the stratum of thick 22cm is loaded, and from bottom drain pipe lentamente to the saturated stratum that intakes stratum, adopt the infiltration coefficient of constant head formation testing, to detect the occupied state on stratum.Then top is filled with the mud of 21cm height, after sealing device, applies air pressure by air compressor machine.Bottom of device offers drain pipe, is used for collecting the water or mud that ooze out in process of the test.The method considers the osmotic pressure of mud, but does not account for the stratum soil pressure of a certain depth, and what realize that mud permeates in the earth formation the most truly simulates, and its seepage discharge recorded can not represent slurry penetration situation when prime stratum completely.Therefore by existing method of testing, slurry penetration under initial condition can not be carried out science test.

Summary of the invention

It is an object of the invention to overcome the defect of prior art, it is provided that a kind of mud pervasion test device and method of testing in soil layer, solve existing test device can not in simulated formation real os-motic state so that the coarse problem of seepage discharge that records.

The technical scheme realizing above-mentioned purpose is:

The method of testing that a kind of mud of the present invention permeates in soil layer, including:

Obtain stratum soil sample and reinvent according to the strata pressure residing for the soil sample of described stratum, the stratum soil sample reinvented is loaded in soil sample clamper;

Described soil sample clamper is applied confined pressure;

Injecting mud in the mud tube of described soil sample clamper one end and seal, the mud of injection contacts with the upper surface of described stratum soil sample;

The mud tube of described soil sample clamper is applied axial compression;And

One end corresponding with described stratum soil sample lower surface on described soil sample clamper arranges delivery line, and timing also records the seepage discharge of described stratum soil sample.

Stratum soil sample has been reinvented by the present invention, also simulate the mud pressure that the degree of depth residing for soil sample overlying earth pressure suffered in the earth formation and soil sample is subject to simultaneously, farthest simulate stratum soil sample real bearing state in the earth formation, overcoming the problem not considering the pressure suffered by soil sample in prior art, the result measured by the present invention is more accurately and reliably.The invention provides the pervasion test device in soil layer of mud when two-dimensional pressure and method, compensate for the deficiency in this field, provide authentic and valid guide parameters for practice of construction.

Further improvement is that of the method for testing that mud of the present invention permeates in soil layer, described soil sample clamper is cylinder-like structure, it is provided with air bag in described cylinder-like structure, described stratum soil sample and described mud tube it is clamped with in described air bag, described mud tube and described stratum soil sample are that up-down structure is arranged, and the top of described mud tube protrudes out described cylinder-like structure.

Further improvement is that of the method for testing that mud of the present invention permeates in soil layer, applies confined pressure to described soil sample clamper, including:

Connect the first high-pressure air source by the side that the first breather is described air bag, and the first pressure regulator valve is set on described first breather;

Regulate described first pressure regulator valve so that described confined pressure is equal to the overlying earth pressure that described stratum soil sample is born under formation conditions.

Further improvement is that of the method for testing that mud of the present invention permeates in soil layer, applies axial compression to the mud tube of described soil sample clamper, including:

Connect the second high-pressure air source in the top of described mud tube by the second breather, and the second pressure regulator valve is set on described second breather;

Regulate described second pressure regulator valve so that described axial compression is equal to the mud pressure that described stratum soil sample is born under the degree of depth residing for formation conditions.

Mud of the present invention penetration testing further improvements in methods in soil layer are in that, timing also records the seepage discharge of described stratum soil sample, including:

After applying axial compression by described second high-pressure air source, utilize manual time-keeping, record first F and flow out the required time from described delivery line;

Graduated cylinder, the amount of filtrate of mud after measuring 4 hours is placed in the export mouth place of described delivery line.

Present invention also offers the test device that a kind of mud permeates in soil layer, including:

Soil sample clamper, is inside clamped with and carries out, according to the strata pressure residing for the soil sample of stratum, the stratum soil sample reinvented;

The first high-pressure air source being connected with described soil sample clamper, for applying confined pressure to described soil sample clamper;

Being located at the mud tube in described soil sample clamper, be marked with mud in described mud tube, and the top of described mud tube is for sealing structure, bottom is hatch frame and the upper surface with described stratum soil sample contacts;

The second high-pressure air source being connected with described mud tube top, for applying axial compression to described mud tube;And

The delivery line of one end that to be connected on described soil sample clamper corresponding with described stratum soil sample lower surface, for deriving the F penetrated from described stratum soil sample.

Further improvement is that of the test device that mud of the present invention permeates in soil layer, described soil sample clamper is cylinder-like structure, it is provided with air bag in described cylinder-like structure, described stratum soil sample and described mud tube it is clamped with in described air bag, described mud tube and described stratum soil sample are that up-down structure is arranged, and the top of described mud tube protrudes out described cylinder-like structure.

Further improvement is that of the test device that mud of the present invention permeates in soil layer, described first high-pressure air source is connected with the side of described air bag by the first breather, described first breather is provided with the first pressure regulator valve, and described first pressure regulator valve is used for regulating pressure so that described confined pressure is equal to the overlying earth pressure that described stratum soil sample is born under formation conditions.

Further improvement is that of the test device that mud of the present invention permeates in soil layer, described second high-pressure air source is connected with the top of described mud tube by the second breather, described second breather is provided with the second pressure regulator valve, and described second pressure regulator valve is used for regulating pressure so that described axial compression is equal to the mud pressure that described stratum soil sample is born under the degree of depth residing for formation conditions.

Mud of the present invention further improvement is that of pervasion test device in soil layer, the export mouth place of described delivery line is placed with graduated cylinder.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the test device that mud of the present invention permeates in soil layer.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the invention will be further described.

The invention provides test device and method of testing that a kind of mud permeates in soil layer, it is analyzed for slurry penetration and mud skin are formed, by increasing two-dimensional pressure condition, the mud pressure that the pressure of the upper overburden layer that true simulation soil sample is born in soil layer and this soil sample are born under formation conditions, the actual condition of simulation mud and soil sample to realize emulation, obtain and test data more accurately, provide reliable guidance for actual construction.Test device and the method for testing mud of the present invention permeated in soil layer below in conjunction with accompanying drawing illustrate.

Consult Fig. 1, it is shown that the schematic diagram of the test device that mud of the present invention permeates in soil layer.Below in conjunction with Fig. 1, the test device that mud of the present invention is permeated in soil layer illustrates.

As shown in Figure 1, the test device that the mud of the present invention permeates in soil layer includes soil sample clamper the 11, first high-pressure air source the 12, second high-pressure air source 13, mud tube 14, delivery line 15 and graduated cylinder 16, is clamped with and carries out, according to the strata pressure residing for the soil sample of stratum, the stratum soil sample 21 reinvented in soil sample clamper 11;First high-pressure air source 12 is connected with soil sample clamper 11, for soil sample clamper 11 is applied confined pressure, applies confined pressure by the first high-pressure air source 12 and carrys out the overlying earth pressure that true simulated formation soil sample 21 is born under formation conditions;Mud tube 14 is located in soil sample clamper 11, it is marked with mud in mud tube 14, the top of this mud tube 14 is for sealing structure, and bottom is hatch frame and bottom contacts with the upper surface of stratum soil sample 21 so that the mud in mud tube 14 contacts with the upper surface of stratum soil sample 21;Second high-pressure air source 13 is connected with the top of mud tube 14, for mud tube 14 is applied axial compression, by mud tube 14, the axial compression of applying is passed to stratum soil sample 21, and axial compression realizes the mud pressure that true simulated formation soil sample 21 is born under formation conditions;Delivery line 15 one end that to be connected on soil sample clamper 11 corresponding with stratum soil sample 21 lower surface, this delivery line 15 connects with the lower surface of stratum soil sample 21, for collecting and derive the F penetrated from stratum soil sample 21.

Stratum soil sample 21 obtains from stratum, and the pressure of reinventing of stratum soil sample 21 is equal to the overlying earth pressure that this stratum soil sample is born under formation conditions, reduce the time of day of this stratum soil sample 21 so that test device closing to reality more, improve the degree of accuracy of test result.

Soil sample clamper 11 is cylinder-like structure, this cylinder-like structure is top and bottom is equipped with opening, air bag it is provided with in cylinder-like structure, air bag is nested in cylinder-like structure, stratum soil sample 21 and mud tube 14 it is clamped with in air bag, mud tube 14 is arranged in up-down structure with conflict soil sample 21, and the top of mud tube 14 protrudes out cylinder-like structure, and the junction on mud tube 14 and cylinder-like structure top is for sealing structure.

First high-pressure air source 12 is connected with the side of the air bag in soil sample clamper 11 by the first breather 121, first high-pressure air source 12 is inflated in air bag by the first breather 121, owing to air pocket rings embraces stratum soil sample 21, and then apply to enclose to pressure to stratum soil sample 21 by airbag aeration is realized.First breather 121 is provided with the first pressure regulator valve 122, this first pressure regulator valve 122 is used for regulating pressure so that confined pressure is equal to the overlying earth pressure that stratum soil sample 21 is born under formation conditions, to realize true simulated formation soil sample 21 operating mode under formation conditions, improve the degree of accuracy of test result.It is preferred that the first high-pressure air source 12 is nitrogen cylinder.

Second high-pressure air source 13 is connected with the top of mud tube 14 by the second breather 131, it is provided with seal nipple 17 on the top of mud tube 14, this second breather 131 is connected with seal nipple 17, second high-pressure air source 13 applies axial compression by the second breather 131 to the top of mud tube 14, by mud tube 14, axial compression passes to stratum soil sample 21.Second breather 131 is provided with the second pressure regulator valve 132, this second pressure regulator valve 132 is used for regulating pressure so that axial compression is equal to the mud pressure that stratum soil sample 21 is born under the residing degree of depth under formation conditions, to realize the true simulated formation soil sample 21 operating mode under formation conditions, improve the degree of accuracy of test structure.It is preferred that this second high-pressure air source 13 is nitrogen cylinder.

It is placed with graduated cylinder 16, for receiving the filtrate of the mud flowed out from delivery line 15 at the export mouth place of delivery line 15.

Below the measurement apparatus utilizing mud of the present invention to permeate in the earth formation is carried out slurry penetration measurement to illustrate.

nullMud to be measured and soil sample are provided,Soil sample is reinvented according to its pressure residing in the earth formation,Namely utilize the overlying earth pressure that this soil sample is born under formation conditions that the soil sample obtained is reinvented,Then the soil sample reinvented is put in soil sample clamper and clamp,By the first high-pressure air source, the air bag in soil sample clamper is inflated,So that soil sample is applied confined pressure,Regulate the pressure of the upper overburden layer that this confined pressure is born under formation conditions equal to soil sample,Then in mud tube, inject mud,And the top of mud tube is sealed,Mud contacts with the upper surface of soil sample in the bottom of mud tube,Infiltration at the upper surface generation mud of soil sample,By the second high-pressure air source, mud tube is applied axial compression,Through mud tube, axial compression is passed to soil sample,Then timing is started,The permeability of soil sample is tested and records seepage discharge,Timing is started from applying axial compression,Record the time that first F flows out.Amount of filtrate after utilizing graduated cylinder to measure 4 hours.After record is good, discharging pressure, take out soil sample and observe the situation forming mud skin, the research of the mud skin of soil sample end is adopted observational method, the infiltration situation of clay particle is observed by available scanning electron microscope in detail.Assembly of the invention not only simulates soil sample actual physical state in the earth formation, so that test result is more accurate, science.

The method of testing below mud of the present invention permeated in soil layer illustrates.

The method of testing that mud of the present invention permeates in soil layer includes:

As it is shown in figure 1, obtain stratum soil sample and reinvent according to the strata pressure residing for the soil sample of stratum, the stratum soil sample 21 reinvented is loaded in soil sample clamper 11;

Soil sample clamper 11 is applied confined pressure;

Injecting mud in the mud tube 14 of soil sample clamper 11 one end and seal, the mud of injection contacts with the upper surface of stratum soil sample 21;

The mud tube of soil sample clamper 11 is applied axial compression;And

One end corresponding with stratum soil sample 21 lower surface on soil sample clamper 11 arranges delivery line 15, and timing also records the seepage discharge of stratum soil sample.

Stratum soil sample 21 is reinvented, adopts the overlying earth pressure that stratum soil sample is born under formation conditions that stratum soil sample 21 is reinvented, so that stratum soil sample 21 can simulate its operating mode in formation conditions more really.

Soil sample clamper 11 is cylinder-like structure, air bag it is provided with in cylinder-like structure, stratum soil sample 21 and mud tube 14 it is clamped with in air bag, mud tube 14 and stratum soil sample 21 are arranged in up-down structure, the top of mud tube 14 protrudes out cylinder-like structure, injects 100ml mud in mud tube 14, and by the end sealing of mud tube 14, mud is contacted by the bottom of mud tube 14 with the upper surface of stratum soil sample 21, and then mud offers infiltration in stratum soil sample 21 at the upper surface of stratum soil sample 21.

Soil sample clamper is applied confined pressure, including:

Connect the first high-pressure air source 12 by the side that the first breather 121 is air bag, and the first pressure regulator valve 122 is set on the first breather 121;Regulate the first pressure regulator valve 122 so that confined pressure is equal to the overlying earth pressure that stratum soil sample 21 is born under formation conditions.First high-pressure air source 12 is inflated in air bag by the first breather 121, and then realizes applying to enclose to pressure to stratum soil sample 21, and first regulates valve 122 is used for regulating pressure, realizes regulating by controlling the opening and closing of the first breather 121.Apply the confined pressure identical with the overlying earth pressure that it bears under formation conditions by the first high-pressure air source 12 to stratum soil sample 21, improve the accuracy of method of testing.

The mud tube of soil sample clamper is applied axial compression, including:

Connect the second high-pressure air source 13 in the top of mud tube 14 by the second breather 131, and the second pressure regulator valve 132 is set on the second breather 131;Regulate the second pressure regulator valve 132 so that axial compression is equal to the mud pressure that stratum soil sample 21 is born under the degree of depth residing for formation conditions.Second high-pressure air source 13 applies axial compression by the second breather 131 to the top of mud tube 14, by mud tube 14, axial compression passes to stratum soil sample 21.Second breather 131 is provided with the second pressure regulator valve 132, this second pressure regulator valve 132 is used for regulating pressure so that axial compression is equal to the mud pressure that stratum soil sample 21 is born under the residing degree of depth under formation conditions, to realize the true simulated formation soil sample 21 operating mode under formation conditions, improve the degree of accuracy of test structure.It is preferred that the first high-pressure air source 12 and the second high-pressure air source 13 are nitrogen cylinder.

Timing also records the seepage discharge of described stratum soil sample, including:

After applying axial compression by the second high-pressure air source 13, utilize manual time-keeping, record first F and flow out the required time from delivery line 15;Graduated cylinder 16, the amount of filtrate of mud after measuring 4 hours is placed in the export mouth place of delivery line 15.After being measured, after the confined pressure that first high-pressure air source 12 and the second high-pressure air source 13 are applied and axial compression release, take out stratum soil sample 21, adopt observational method to study the mud skin of end, utilize scanning electron microscope that the infiltration situation of clay particle is observed in detail.

Test device that mud of the present invention permeates in soil layer and the having the beneficial effect that of method of testing

The test device of the present invention and method of testing, soil sample can not only be reinvented with reference to residing strata pressure, but also simulate the mud pressure that the degree of depth residing for soil sample overlying earth pressure suffered in the earth formation and soil sample is subject to, thus farthest simulating soil sample real bearing state in the earth formation during construction of diaphragm wall, overcome the deficiency that in the past can not consider confined pressure so that based on this device test result more accurately and reliably.

Above in association with accompanying drawing embodiment, the present invention being described in detail, the present invention can be made many variations example by those skilled in the art according to the above description.Thus, some details in embodiment should not constitute limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.

Claims (10)

1. the method for testing that a mud permeates in soil layer, it is characterised in that including:
Obtain stratum soil sample and reinvent according to the strata pressure residing for the soil sample of described stratum, the stratum soil sample reinvented is loaded in soil sample clamper;
Described soil sample clamper is applied confined pressure;
Injecting mud in the mud tube of described soil sample clamper one end and seal, the mud of injection contacts with the upper surface of described stratum soil sample;
The mud tube of described soil sample clamper is applied axial compression;And
One end corresponding with described stratum soil sample lower surface on described soil sample clamper arranges delivery line, and timing also records the seepage discharge of described stratum soil sample.
2. the method for testing that mud as claimed in claim 1 permeates in soil layer, it is characterized in that, described soil sample clamper is cylinder-like structure, it is provided with air bag in described cylinder-like structure, described stratum soil sample and described mud tube it is clamped with in described air bag, described mud tube and described stratum soil sample are that up-down structure is arranged, and the top of described mud tube protrudes out described cylinder-like structure.
3. the method for testing that mud as claimed in claim 2 permeates in soil layer, it is characterised in that described soil sample clamper is applied confined pressure, including:
Connect the first high-pressure air source by the side that the first breather is described air bag, and the first pressure regulator valve is set on described first breather;
Regulate described first pressure regulator valve so that described confined pressure is equal to the overlying earth pressure that described stratum soil sample is born under formation conditions.
4. the method for testing that mud as claimed in claim 2 permeates in soil layer, it is characterised in that the mud tube of described soil sample clamper is applied axial compression, including:
Connect the second high-pressure air source in the top of described mud tube by the second breather, and the second pressure regulator valve is set on described second breather;
Regulate described second pressure regulator valve so that described axial compression is equal to the mud pressure that described stratum soil sample is born under the degree of depth residing for formation conditions.
5. the method for testing that mud as claimed in claim 4 permeates in soil layer, it is characterised in that timing also records the seepage discharge of described stratum soil sample, including:
After applying axial compression by described second high-pressure air source, utilize manual time-keeping, record first F and flow out the required time from described delivery line;
Graduated cylinder, the amount of filtrate of mud after measuring 4 hours is placed in the export mouth place of described delivery line.
6. the test device that a mud permeates in soil layer, it is characterised in that including:
Soil sample clamper, is inside clamped with and carries out, according to the strata pressure residing for the soil sample of stratum, the stratum soil sample reinvented;
The first high-pressure air source being connected with described soil sample clamper, for applying confined pressure to described soil sample clamper;
Being located at the mud tube in described soil sample clamper, be marked with mud in described mud tube, and the top of described mud tube is for sealing structure, bottom is hatch frame and the upper surface with described stratum soil sample contacts;
The second high-pressure air source being connected with described mud tube top, for applying axial compression to described mud tube;And
The delivery line of one end that to be connected on described soil sample clamper corresponding with described stratum soil sample lower surface, for deriving the F penetrated from described stratum soil sample.
7. the test device that mud as claimed in claim 6 permeates in soil layer, it is characterized in that, described soil sample clamper is cylinder-like structure, it is provided with air bag in described cylinder-like structure, described stratum soil sample and described mud tube it is clamped with in described air bag, described mud tube and described stratum soil sample are that up-down structure is arranged, and the top of described mud tube protrudes out described cylinder-like structure.
8. the test device that mud as claimed in claim 7 permeates in soil layer, it is characterized in that, described first high-pressure air source is connected with the side of described air bag by the first breather, described first breather is provided with the first pressure regulator valve, and described first pressure regulator valve is used for regulating pressure so that described confined pressure is equal to the overlying earth pressure that described stratum soil sample is born under formation conditions.
9. the test device that mud as claimed in claim 7 permeates in soil layer, it is characterized in that, described second high-pressure air source is connected with the top of described mud tube by the second breather, described second breather is provided with the second pressure regulator valve, and described second pressure regulator valve is used for regulating pressure so that described axial compression is equal to the mud pressure that described stratum soil sample is born under the degree of depth residing for formation conditions.
10. the test device that mud as claimed in claim 9 permeates in soil layer, it is characterised in that the export mouth place of described delivery line is placed with graduated cylinder.
CN201610079708.XA 2016-02-04 2016-02-04 Testing device and method for permeation of slurry in soil layer CN105738255A (en)

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CN110987728B (en) * 2019-12-06 2020-11-27 北京科技大学 Experimental device for simultaneous determination of forward and reverse dust penetration rates

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