CN104215484A - Preparation method of saturated soil sample in geotechnique dynamic centrifugal model test - Google Patents
Preparation method of saturated soil sample in geotechnique dynamic centrifugal model test Download PDFInfo
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Abstract
The invention relates to a preparation method of a saturated soil sample in a geotechnique dynamic centrifugal model test. The preparation method comprises the following steps of drying a field soil sample, crushing, and screening the field soil sample through a geotechnique sieve; calculating the needed water amount after the saturated moisture content tested by a conventional geotechnique test is increased to a certain extent, stirring and preparing the saturated soil sample in a vacuum stirring machine; uniformly loading the saturated soil sample into a model box, and embedding a porosity water pressure sensor in the soil sample; laying an isolation layer on the top of the saturated soil sample, uniformly laying dry sand with a given thickness on the isolation layer, and uniformly putting the prepared bagged dry sand on the dry sand layer; hoisting the model box, starting a centrifugal machine after the model box is fixed, and solidifying the saturated soil sample after a designed acceleration is reached; judging the stopping time through the embedded porosity water pressure sensor, stopping the machine, and hanging out the model box after the initial excess pore pressure is completely dissipated; and repeating the operation until the entire model is prepared. By adopting the preparation method, the saturation time of the soil sample can be shortened, the secondary application problem of the soil sample caused by the limit for taking soil on a field can be solved, the centrifugal solidification time can be shortened, and the solidification ending time can be accurately judged.
Description
Technical field
The present invention relates to a kind of preparation method of saturated soil sample, especially relate to a kind of preparation method for soil sample saturated in geotechnological dynamic centrifuge model test.
Background technology
The soil body is as the typical nonlinear material of one, and its stress-strain relation and hydraulic performance affect huge by stress level.In recent years, Geotechnical Centrifugal Model Test model test because of its accuracy that can overcome numerical method cannot the defect of also original initial gravity stress by the restriction of parameter and common physics model test, thus obtain in Geotechnical Engineering field widely with application.The centrifugal force simulated gravity produced by hydro-extractor High Rotation Speed, produce controlled earthquake motion at model bottom by shaking table simultaneously, energy is the earthquake response of true reappearance model under actual stress level preferably, this plays an important role, simultaneously for numerical value and theoretical analysis provide true and reliable correlation data for the dynamic response and Mechanism of Deformation And Failure disclosing soil structures.
When the reaction utilizing the soil bodys such as geotechnical centrifuge research sand liquefaction under earthquake load, for solving the problem of power time and Seepage flow time ratio of similitude contradiction, the pore water in glutinousness Fluid simulation prototype need be adopted, therefore, when geotechnological Dynamic Centrifugal Model Test, it is saturated that model generally need use viscous liquid to carry out.Meanwhile, in Practical Project, the on-the-spot original position of general employing fetches earth and tests, and consider that the expense of fetching earth and test itself exist repeatability, soil sample recycling is inevitable.Adopt hydro-extractor consolidated clay to be accepted extensively by industry, but how to judge the consolidation end time and save the problems demand solution of consolidation time.
Classic method generally adopts spray mode or applies back-pressure that to carry out model saturated.So-called spray mode is sprayed onto model surface by pore liquid, is undertaken saturated afterwards by liquid gravity infiltration; So-called back-pressure is saturated is placed in vacuum environment by model, and passing into hole liquid thereby from model bottom or inside, to help negative pressure to carry out saturated.Though classic method can make soil sample saturated, complex procedures and not easy to operate, simultaneously when adopting high viscosity liquid to carry out saturated by the cost plenty of time and test afterwards saturated soil sample cannot directly again utilize.When utilizing hydro-extractor consolidation saturated clays, generally rule of thumb judge the consolidation end time, without quantitative target as standard.Simultaneously during classic method consolidation saturated soil, only carry out draining by soil body deadweight and infiltration, consolidation time is long.
Summary of the invention
For overcoming the defect of above-mentioned traditional method for making sample, the present invention proposes a kind of flow process succinct, easy to operate, accurate judgement consolidation end time and realizing the preparation method of the saturated soil sample for geotechnological dynamic centrifuge model test of soil sample recycling.
The preparation method for the saturated soil sample of geotechnological power centrifugal test that the present invention proposes, concrete steps are as follows:
(1) enchashment field soil sample, is dried, is pulverized, and crosses geotechnique's sieve;
(2) conveniently soil test, the water percentage of the soil sample that measuring process (1) obtains, the sample preparation water percentage reached needed for tested soil sample, calculates the amount of water needed for soil sample, soil sample and water are stirred 4-5 hour in de-airing mixer, prepares saturated soil sample;
(3) saturated soil sample is evenly loaded in model casing, and in saturated soil sample, bury hole water hole underground defeat sensor;
(4) lay separation layer at saturated soil sample top, above separation layer, evenly lay the dry sand of 4-8 centimetre, ready packed dry sand is evenly put on dry sand;
(5) lift model casing, open hydro-extractor after fixed die molding box, after hydro-extractor reaches design acceleration, start the consolidation of saturated soil sample;
(6) judge hydro-extractor stop time by the pore water pressure sensor be embedded in saturated soil sample, after initial super hole pressure dissipates completely, shutdown hangs out model casing;
(7) repeat step (1)-(6), prepared to whole model.
In the present invention, described geotechnological mesh size is 2-10mm.
In the present invention, described sample preparation water percentage surveys saturated aqueous rate height 5%-8% than conventional soil test.
In the present invention, described separation layer is any one in nonwoven fabrics or window screening.
In the present invention, the bag material in described packed dry sand is impermeable material.
In the present invention, described design acceleration is the centrifugal acceleration of official test.
Beneficial effect of the present invention is:
Compared with prior art, the present invention pulverizes by on-the-spot soil sample being dried, thus dry powder quality needed for model for accurate calculation, survey saturated aqueous rate according to geotechnological conventional test, suitably improve institute's water requirement, produce saturated soil sample by de-airing mixer; The load of model is increased by dry sand and packed dry sand, and the water sorption of dry sand, the consolidation time of the soil body can be greatly reduced; The consolidation end time is accurately judged according to the pore water pressure sensor in the soil body.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.
Fig. 1 is the geotechnological Dynamic Centrifugal Model Test saturated soil sample preparation method schematic diagram of a specific embodiment of the present invention.
Number in the figure: 1 is model casing, 2 is soil sample, and 3 is pore water pressure sensor, and 4 is dry sand, and 5 is packed dry sand.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1:
Certain Extra-fine sand undisturbed soil acquired for scene is driven bucket, puts into baking oven after preliminary pulverizing and dry, soil sample will be dried and pulverize and cross 2mm geotechnique sieve.Take this kind of soil sample 65kg, know according to conventional soil test, this layer soil body saturated aqueous rate is 29%, and calculating required hole liquid quality by water percentage 35% is 22.75kg.The soil sample taken and solution (water) are added in de-airing mixer, stirs 4-5 hour after sealing, make soil sample fully saturated.Soil sample after stirring slowly is added the model casing 1 shown in Fig. 1, and buries pore water pressure sensor 3 underground, after surface is floating.Ready isolated material is laid in soil sample 2 surface as separation layer, after on separation layer, be evenly sprinkled into the thick dry sand of 5cm 4, and surface is floating.Put into packed dry sand 5 to equal with model casing 1 top at dry sand 4 surface uniform, when must ensure to place symmetrically, during to prevent consolidation, saturated soil sample produces relative settlement.By the model lifting for preparing on hydro-extractor, fix rear unlatching hydro-extractor, make hydro-extractor evenly accelerate to 45g and start model consolidation.When pore water pressure sensor 3 survey super pore pressure dissipation complete after end consolidation test.After hanging out model casing, take out packed dry sand 5 and dry sand 4 repeats above step, until model has been prepared completely.
The saturated sample preparation method of geotechnological centrifugal power model test provided by the present invention, stirs into supersaturation soil sample by de-airing mixer by oven dry soil sample and pore liquid; By the load of dry sand and packed dry sand Quality advance soil sample and pore liquid unnecessary in dry sand Absorbable rod supersaturation soil sample, there is remarkable effect to minimizing consolidation time; Can accurately judge the consolidation end time by pore water pressure sensor, increase the fiduciary level of test.
The foregoing is only the embodiment of the inventive method, and be not used to the scope limiting the inventive method.Any those skilled in the art, the equivalent variations proposed under the prerequisite of the design and principle that do not depart from the inventive method, amendment and combination, all belong to the scope of protection of the invention.
Claims (6)
1., for a preparation method for the saturated soil sample of geotechnological power centrifugal test, it is characterized in that concrete steps are as follows:
(1) enchashment field soil sample, is dried, is pulverized, and crosses geotechnique's sieve;
(2) conveniently soil test, the water percentage of the soil sample that measuring process (1) obtains, the sample preparation water percentage reached needed for tested soil sample, calculates the amount of water needed for soil sample, soil sample and water are stirred 4-5 hour in de-airing mixer, prepares saturated soil sample;
(3) saturated soil sample is evenly loaded in model casing, and bury pore water pressure sensor underground in saturated soil sample;
(4) lay separation layer at saturated soil sample top, above separation layer, evenly lay the dry sand of 4-8 centimetre, ready packed dry sand is evenly put on dry sand;
(5) lift model casing, open hydro-extractor after fixed die molding box, after hydro-extractor reaches design acceleration, start the consolidation of saturated soil sample;
(6) judge hydro-extractor stop time by the pore water pressure sensor be embedded in saturated soil sample, after initial super hole pressure dissipates completely, shutdown hangs out model casing;
(7) repeat step (1)-(6), prepared to whole model.
2. a kind of preparation method for the saturated soil sample of geotechnological power centrifugal test according to claim 1, it is characterized in that, described geotechnological mesh size is 2-10mm.
3. a kind of preparation method for the saturated soil sample of geotechnological power centrifugal test according to claim 1, it is characterized in that, described sample preparation water percentage surveys saturated aqueous rate height 5%-8% than conventional soil test.
4. a kind of preparation method for the saturated soil sample of geotechnological power centrifugal test according to claim 1, is characterized in that, described separation layer is any one in nonwoven fabrics or window screening.
5. a kind of preparation method for the saturated soil sample of geotechnological power centrifugal test according to claim 1, it is characterized in that, the bag material in described packed dry sand is impermeable material.
6. a kind of preparation method for the saturated soil sample of geotechnological power centrifugal test according to claim 1, it is characterized in that, described design acceleration is the centrifugal acceleration of official test.
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Cited By (12)
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| CN105890946A (en) * | 2016-04-07 | 2016-08-24 | 青岛理工大学 | Preparation method for cohesive soil layer for simulating static pile sinking process |
| CN105971029A (en) * | 2016-06-06 | 2016-09-28 | 北京工业大学 | Multi-directional layered shearing model box capable of simulating saturated soil solidification |
| CN107664594A (en) * | 2017-05-15 | 2018-02-06 | 长安大学 | A kind of Structural Loess physical model and preparation method |
| CN108132114A (en) * | 2017-12-13 | 2018-06-08 | 同济大学 | One kind is used for centrifugal model test tunnel model surface pressing harvester |
| CN108896465A (en) * | 2018-07-02 | 2018-11-27 | 交通运输部天津水运工程科学研究所 | The method of vacuum generating device and realization vacuum in geotechnical centrifugal model test |
| CN109060479A (en) * | 2018-08-29 | 2018-12-21 | 长安大学 | A kind of configuration method of the dynamic model test soil body |
| CN109580304A (en) * | 2018-12-07 | 2019-04-05 | 成都理工大学 | The shake table model preparation method of pore pressure response is driven for water weak intercalated layer of satisfying |
| CN109959541A (en) * | 2019-04-10 | 2019-07-02 | 浙江大学 | A kind of intelligence geo- textile technique saturation device |
| CN110241803A (en) * | 2019-06-21 | 2019-09-17 | 席早阳 | Dual chamber hole pressure touching methods vacuum is saturated machine |
| CN111965037A (en) * | 2020-08-05 | 2020-11-20 | 重庆大学 | Composite foundation rigidity loading test system and loading test method for geotechnical centrifuge |
| CN113514292A (en) * | 2021-04-06 | 2021-10-19 | 武汉工程大学 | Small-sized geotechnical centrifuge for sample preparation in triaxial test and sample preparation method |
| CN114486431A (en) * | 2022-01-18 | 2022-05-13 | 中国石油大学(北京) | Soil sample preparation facilities suitable for centrifuge experiment |
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Cited By (16)
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|---|---|---|---|---|
| CN105890946A (en) * | 2016-04-07 | 2016-08-24 | 青岛理工大学 | Preparation method for cohesive soil layer for simulating static pile sinking process |
| CN105971029A (en) * | 2016-06-06 | 2016-09-28 | 北京工业大学 | Multi-directional layered shearing model box capable of simulating saturated soil solidification |
| CN105971029B (en) * | 2016-06-06 | 2018-01-12 | 北京工业大学 | A kind of multidirectional laminar shear model casing for simulating saturation soil solidifying |
| CN107664594A (en) * | 2017-05-15 | 2018-02-06 | 长安大学 | A kind of Structural Loess physical model and preparation method |
| CN108132114A (en) * | 2017-12-13 | 2018-06-08 | 同济大学 | One kind is used for centrifugal model test tunnel model surface pressing harvester |
| CN108896465A (en) * | 2018-07-02 | 2018-11-27 | 交通运输部天津水运工程科学研究所 | The method of vacuum generating device and realization vacuum in geotechnical centrifugal model test |
| CN108896465B (en) * | 2018-07-02 | 2024-02-23 | 交通运输部天津水运工程科学研究所 | Vacuum generating device in geotechnical centrifuge model test and method for realizing vacuum |
| CN109060479A (en) * | 2018-08-29 | 2018-12-21 | 长安大学 | A kind of configuration method of the dynamic model test soil body |
| CN109580304B (en) * | 2018-12-07 | 2019-11-05 | 成都理工大学 | The shake table model preparation method of pore pressure response is driven for water weak intercalated layer of satisfying |
| CN109580304A (en) * | 2018-12-07 | 2019-04-05 | 成都理工大学 | The shake table model preparation method of pore pressure response is driven for water weak intercalated layer of satisfying |
| CN109959541A (en) * | 2019-04-10 | 2019-07-02 | 浙江大学 | A kind of intelligence geo- textile technique saturation device |
| CN110241803A (en) * | 2019-06-21 | 2019-09-17 | 席早阳 | Dual chamber hole pressure touching methods vacuum is saturated machine |
| CN111965037A (en) * | 2020-08-05 | 2020-11-20 | 重庆大学 | Composite foundation rigidity loading test system and loading test method for geotechnical centrifuge |
| CN113514292A (en) * | 2021-04-06 | 2021-10-19 | 武汉工程大学 | Small-sized geotechnical centrifuge for sample preparation in triaxial test and sample preparation method |
| CN114486431A (en) * | 2022-01-18 | 2022-05-13 | 中国石油大学(北京) | Soil sample preparation facilities suitable for centrifuge experiment |
| CN114486431B (en) * | 2022-01-18 | 2023-10-20 | 中国石油大学(北京) | Soil sample preparation device suitable for centrifuge experiment |
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