CN101776544B - Method for preparing big-size model test soil body - Google Patents

Method for preparing big-size model test soil body Download PDF

Info

Publication number
CN101776544B
CN101776544B CN201010101165XA CN201010101165A CN101776544B CN 101776544 B CN101776544 B CN 101776544B CN 201010101165X A CN201010101165X A CN 201010101165XA CN 201010101165 A CN201010101165 A CN 201010101165A CN 101776544 B CN101776544 B CN 101776544B
Authority
CN
China
Prior art keywords
soil
test
layer
jolt ramming
density
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201010101165XA
Other languages
Chinese (zh)
Other versions
CN101776544A (en
Inventor
孔令刚
陈仁朋
林炎飞
张革强
王顺玉
詹良通
陈云敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangsha Construction Group Co., Ltd.
Zhejiang University ZJU
Original Assignee
GUANGSHA CONSTRUCTION GROUP CO Ltd
Zhejiang University ZJU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUANGSHA CONSTRUCTION GROUP CO Ltd, Zhejiang University ZJU filed Critical GUANGSHA CONSTRUCTION GROUP CO Ltd
Priority to CN201010101165XA priority Critical patent/CN101776544B/en
Publication of CN101776544A publication Critical patent/CN101776544A/en
Application granted granted Critical
Publication of CN101776544B publication Critical patent/CN101776544B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a method for preparing a big-size model test soil body by layered compaction, comprising the following steps: deciding a filing scheme, processing before soil body filling, borrowing soil based on blocking, putting soil, smoothing in whole, compacting in whole, detecting compaction quality, burying test apparatus and devices, laying an identification layer, testing soil body texture by cone penetration test (CPT) or other in-situ testers and saturating model soil if necessary. In the invention, water content reduction by vacuum pumping, proper air drying in the sun and other methods and combination thereof are adopted to reduce water content of floury soil and silty soil and save labor and cost for drying and other methods. The filling quality and uniformity of the model soil can be accurately controlled by adopting the simple and reasonable filling steps, which is suitable for model tests with high requirements for model soil. The identification layer is laid in the filling layer if necessary, so that soil body deformation can be observed directly by post-test excavation or transparent observation windows on side walls.

Description

A kind of preparation method of big-size model test soil body
Technical field
The present invention relates to a kind of big-size model test soil body by layered compaction preparation method, especially relate to and a kind of model clay is filled quality and the higher big-size model test soil body by layered compaction preparation method of uniformity requirement.
Background technology
In geotechnological physical model experiment, for guarantee to test quality, experiment condition is controlled, generally density and the homogeneity to model clay has higher requirements.When utilizing the small-scale model case to carry out experiment, because earth volume is few, operation control is easy, the therefore preparation and the general easy processing of quality control of soil, soil body preparation quality can guarantee.When utilizing the large scale model casing, as the huge model groove of 15m (length) * 5m (wide) * 6m (height), then cubic metre of earth consumption is huge, and soil layer how to prepare good uniformity, controllable density well becomes a difficult problem.
In the model test soil body preparation method, a kind of is the method for raining, and the method falls into soil in the test flume from certain altitude by specific device, forms the soil layer of certain density.There is following shortcoming in this method: 1, the scope of application is little, and the method is only applicable to the uniform dry sand of particle size.2, the method for the raining soil layer influence factor of filling is more, and the quality of banketing is wayward.3, the density and the intensity of preparation soil layer are lower.Another kind is layering vibro-compaction method or compacting method, and this kind method with loose soil layer compacting, can prepare the sand, silt, clay and the rubble that contain certain moisture by jolt ramming machinery or ballast consolidating machine, and range of application is more extensive.
Summary of the invention
The object of the present invention is to provide a kind of big-size model test soil body by layered compaction preparation method, this method step is simple, and the density of banketing and homogeneity control better can be satisfied the universal model testing requirements.
The technical solution used in the present invention may further comprise the steps:
Before determining, the present invention's scheme of banketing carries out the small-sized jolt ramming test in early stage, by testing the feasibility of determining to be issued to target density in a certain water cut, and the basic parameter of the gait of march of definite soil body thickness in monolayer, jolt ramming machinery, jolt ramming number of times and jolt ramming machinery; During soil body layering jolt ramming, this soil layer upper and lower part soil body density has difference, and top soil body density is big, according to model clay density error allowed band, determines the Rational Thickness of single-layer soil by this small-sized jolt ramming test; In the optional thickness range of single-layer soil, select higher value, to reduce preparation of soil sample workload;
This method comprises the steps:
1) scheme of banketing is determined:
Before determining, the scheme of banketing carries out the small-sized jolt ramming test in early stage, after the basic parameter of small-sized jolt ramming test is determined, the size and the required depth of fill according to test flume are calculated the gross mass of banketing, the whole zone of big young pathbreaker according to test flume is divided into several area blocks, calculates each block individual layer according to the block area and the individual layer depth of fill and fills quality;
2) soil body fills pre-treatment:
The earth material density and the water cut that are taken in the nature are inhomogeneous, handle in the following manner before filling: draw water processings, (2) air-dry airing of (1) vacuum turns method uniform density and water cut with (3) by mixing;
3) fetch earth, put soil, integral body is paved:
Put into the model groove with satisfying the banket earth material of quality of block individual layer, subregion carries out when putting soil, with the plough of the soil in each block pine, and puts in order smooth;
4) whole jolt ramming:
Use jolt ramming machinery jolt ramming soil layer, guarantee that the jolt ramming pass of the soil on each unit area is identical, and finally reach the soil thickness that designs in the scheme of banketing;
5) jolt ramming quality testing:
After every layer of jolt ramming is finished, select the test flume diverse location to measure soil body density and water cut everywhere, if each site density average is littler by 10% than design density, then this layer need are mended and are shaken, if each site density average is bigger by 10% than design density, behind this layer plough pine, again jolt ramming, if the difference of each site density and average density is greater than 10%, with this layer plough pine, smooth again back jolt ramming;
6) bury and put test unit and instrument:
According to the test needs, after every layer of native jolt ramming, borehole, hole wall is hung hair, puts into test unit and instrument, and makes compacting by hand, makes test unit and instrument surrounding soil density reach designing requirement;
7) lay dye layer:
Jolt ramming and bury put test unit and instrument well after, smooth soil layer surface, and with the levelness on surveyor's staff detection layers surface; After finishing, in soil layer, make label layer as needs and observe the soil deformation situation, then lay one deck color powder material different with the soil body on the soil layer surface; Afterwards, according to the described step 2 of claim 1)~7) method descend one deck to handle, until finishing; Prepare saturated soil as need, finish preparation work according to the method described above after, carry out step 8), otherwise directly carry out step 9);
8) the saturated processing of model clay:
Before banketing, need water supply network to be set in the test flume bottom, water system can observing and controlling intake pressure and inflow, finish preparation work according to the method described above after, improve head from bottom to top until finishing saturated processing (water system is with reference to ZL 200710069866.8) by water supply network;
9) soil mass property in-situ test:
After above-mentioned work is finished, in test flume, select measuring point, use CPT or other in-situ test instruments test soil mass property.
Compare with background technology, the beneficial effect that the present invention has is:
1, recommends to adopt the method for vacuum-dewatering, suitable air-dry airing or both combinations, reduced the water cut of silt, silt, saved the expense that adopts methods such as oven dry.
2, the parameter of banketing is tested definitely in advance, and the preparation of soil sample is undertaken by set step, and measures soil body density in real time, can more accurately control banket density and homogeneity.
3, as establishing label layer at the fill stratum middle berth, can be by the distortion situation of the test back excavation or the sidewall transparent windows Direct observation soil body.
Description of drawings
Fig. 1 is a component curve figure of the used silt of embodiments of the invention.
Fig. 2 is an embodiments of the invention test result density profile.
Fig. 3 is an embodiments of the invention test result CPT static point resistance distribution plan.
Fig. 4 is an embodiments of the invention test result CPT side friction distribution plan.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
It is 1700kg/m that present embodiment is used for preparing target density in the test flume of 5m * 5m area 3, water cut is about 15% unsaturation powder soil horizon and saturated powder soil horizon.Fig. 1 is for using a component curve of silt.Preparation process comprises the steps:
1) scheme of banketing is determined;
2) soil body fills pre-treatment;
3) fetch earth, put soil, integral body is paved;
4) whole jolt ramming;
5) jolt ramming quality testing;
6) bury and put test apparatus and device;
7) lay dye layer;
8) model clay is carried out saturated processing;
9) soil mass property in-situ test.
In the described step 1), before determining, the scheme of banketing carries out the small-sized jolt ramming test in early stage, by testing the feasibility of determining to be issued to target density in a certain water cut, and the gait of march parameter of definite soil body thickness in monolayer, jolt ramming machinery, jolt ramming number of times and jolt ramming machinery; During soil body layering jolt ramming, this soil layer upper and lower part soil body density has difference, and top soil body density is big, according to model clay density error allowed band, determines the Rational Thickness of single-layer soil by this small-sized jolt ramming test; In the optional thickness range of single-layer soil, select higher value, to reduce preparation of soil sample workload.
This example institute depth of fill is 3.00m, determines every layer thickness 20cm by small-sized jolt ramming test, adopts NZH type plain bumper, and the jolt ramming number of times is 4 times, travelling speed 5m/min.The plain bumper parameter is as follows: jolt pressure 2000kg, jolt ramming area 0.143m 2, vibration frequency 22Hz, general assembly (TW) 190kg.The whole area that bankets is divided into 4 fritters of 2.5m * 2.5m.The every layer of every required quality of banketing is 2.125t.
Described step 2) in, the used silt of this example near saturated, has higher moisture before use, by the networking of drawing water that test flume has part moisture in the used silt is extracted out, water cut is reduced to below 20%, and the back makes used silt moisture reach 14%~16% by suitable airing.
In the described step 3), use grapple that silt is grabbed in the test flume from laydown area, blockette carries out when putting soil, and the quality that control and record fetch earth when fetching earth makes the quality of the soil of each block reach calculated amount.When putting soil, require grab bucket near decontroling behind the ground, the impulsive force of anti-falling stop soil causes the inhomogeneous compacting of model clay again.Use plough to wait instrument, reach sufficient loose condition (of surface) the plough of the soil in each block pine.And make soil layer surfacing in the whole test groove area.
In the described step 4), carry out jolt ramming after paving, the reciprocal jolt ramming of advancing of crawling of jolt ramming machinery.Back and forth in the jolt ramming process, the plain bumper track route overlaps 1/2 with jolt ramming, runs into the object that need dodge, turns to not jolt ramming direction, and the plain bumper pace remains a constant speed.After the 1st time jolt ramming, need flatten native face once more, carry out jolt ramming next time afterwards.Finally make this layer thickness that bankets reach 20cm.
In the described step 5), after every layer of jolt ramming is finished, by being distributed on a plurality of measuring points in the test flume, use core cutter method and oven drying method density measurement and water cut, Fig. 2 is the measurement result for each layer density.
In the described step 6), according to the test needs, after every layer of native jolt ramming is good, dig the hole that is fit to size, hole wall is hung hair, puts into Model Pile, soil pressure sensor, soil internal displacement measuring tube, and the use hand compaction, make sensor place soil body density and native consistent on every side.
In the described step 7), jolt ramming and bury put testing equipment well after, leveling soil layer surface, and with the levelness on surveyor's staff detection layers surface.After finishing, the smalt layer about soil layer surface laying 1mm is as label layer.Afterwards, according to the described step 2 of claim 1)~7) method descend the processing of one deck, until finishing whole banketing.And, use CPT test soil mass property at 4 selected measuring points according in the described step 9), and Fig. 3 has provided the measurement result of unsaturated soil CPT static point resistance, and Fig. 4 has provided the measurement result of unsaturated soil CPT side friction.
When preparing saturated powder soil horizon, at first prepare soil layer according to above-mentioned same method, it is saturated to carry out soil layer afterwards.
In the described step 8), the water inlet networking water filling in soil layer by being provided with in the test flume bottom reaches capacity up to powder soil horizon, uses CPT test soil mass property at 4 selected measuring points then.Fig. 3 has provided the measurement result of saturated soil CPT static point resistance, and Fig. 4 has provided the measurement result of saturated soil CPT side friction.
Present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

Claims (1)

1. big-size model test soil body by layered compaction preparation method, before determining, the scheme of banketing carries out the small-sized jolt ramming test in early stage, by testing the feasibility of determining to be issued to target density in a certain water cut, and the basic parameter of the gait of march of definite soil body thickness in monolayer, jolt ramming machinery, jolt ramming number of times and jolt ramming machinery; During soil body layering jolt ramming, this soil layer upper and lower part soil body density has difference, and top soil body density is big, according to model clay density error allowed band, determines the Rational Thickness of single-layer soil by this small-sized jolt ramming test; In individual layer ± optional thickness range, select higher value, to reduce preparation of soil sample workload; It is characterized in that this method comprises the steps:
1) scheme of banketing is determined:
Before determining, the scheme of banketing carries out the small-sized jolt ramming test in early stage, after the basic parameter of small-sized jolt ramming test is determined, the size and the required depth of fill according to test flume are calculated the gross mass of banketing, the whole zone of big young pathbreaker according to test flume is divided into several area blocks, calculates each block individual layer according to the block area and the individual layer depth of fill and fills quality;
2) soil body fills pre-treatment:
The earth material density and the water cut that are taken in the nature are inhomogeneous, handle in the following manner before filling: draw water processings, (2) air-dry airing of (1) vacuum turns method uniform density and water cut with (3) by mixing;
3) fetch earth, put soil, integral body is paved:
Put into the model groove with satisfying the banket earth material of quality of block individual layer, subregion carries out when putting soil, with the plough of the soil in each block pine, and puts in order smooth;
4) whole jolt ramming:
Use jolt ramming machinery jolt ramming soil layer, guarantee that the jolt ramming pass of the soil on each unit area is identical, and finally reach the soil thickness that designs in the scheme of banketing;
5) jolt ramming quality testing:
After every layer of jolt ramming is finished, select the test flume diverse location to measure soil body density and water cut everywhere, if each site density average is littler by 10% than design density, then this layer need are mended and are shaken, if each site density average is bigger by 10% than design density, behind this layer plough pine, again jolt ramming, if the difference of each site density and average density is greater than 10%, with this layer plough pine, smooth again back jolt ramming;
6) bury and put test unit and instrument:
According to the test needs, after every layer of native jolt ramming, borehole, hole wall is hung hair, puts into test unit and instrument, and makes compacting by hand, makes test unit and instrument surrounding soil density reach designing requirement;
7) lay dye layer:
Jolt ramming and bury put test unit and instrument well after, smooth soil layer surface, and with the levelness on surveyor's staff detection layers surface; After finishing, in soil layer, make label layer as needs and observe the soil deformation situation, then lay one deck color powder material different with the soil body on the soil layer surface; Afterwards, according to the described step 2 of claim 1)~7) method descend one deck to handle, until finishing; Prepare saturated soil as need, finish preparation work according to the method described above after, carry out step 8), otherwise directly carry out step 9);
8) the saturated processing of model clay:
Before banketing, need water supply network to be set in the test flume bottom, water system can observing and controlling intake pressure and inflow, finish preparation work according to the method described above after, improve head from bottom to top until finishing saturated processing by water supply network;
9) soil mass property in-situ test:
After above-mentioned work is finished, in test flume, select measuring point, use in-situ test instrument test soil mass property.
CN201010101165XA 2010-01-22 2010-01-22 Method for preparing big-size model test soil body Active CN101776544B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201010101165XA CN101776544B (en) 2010-01-22 2010-01-22 Method for preparing big-size model test soil body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201010101165XA CN101776544B (en) 2010-01-22 2010-01-22 Method for preparing big-size model test soil body

Publications (2)

Publication Number Publication Date
CN101776544A CN101776544A (en) 2010-07-14
CN101776544B true CN101776544B (en) 2011-06-22

Family

ID=42513060

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201010101165XA Active CN101776544B (en) 2010-01-22 2010-01-22 Method for preparing big-size model test soil body

Country Status (1)

Country Link
CN (1) CN101776544B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102680292B (en) * 2012-04-28 2014-05-21 同济大学 Sample fabricating device for geotechnical model tests
CN103759996A (en) * 2014-01-15 2014-04-30 中国人民解放军总参谋部工程兵科研三所 Low-strength tamped cement mortar model
CN104020026B (en) * 2014-06-05 2016-08-24 煤炭科学技术研究院有限公司 The manufacture method of refuse dump slope deforming similar experimental model under a kind of water logging base condition
CN107607385B (en) * 2017-08-02 2020-08-14 同济大学 Vacuum test device for triaxial remolded soil sample preparation
CN110261192A (en) * 2019-05-27 2019-09-20 北京城建勘测设计研究院有限责任公司 A kind of remodeling of simulation test soil sample and the method for inspection

Also Published As

Publication number Publication date
CN101776544A (en) 2010-07-14

Similar Documents

Publication Publication Date Title
CN101776544B (en) Method for preparing big-size model test soil body
CN102094432B (en) Model for causing ground setting due to engineering environment effect and test method thereof
CN107179396A (en) Multifunctional built-up formula Geotechnical Engineering physics similar test system
CN102912780B (en) Sandy soil water-immersion testing method for loess collapsible deformation
CN105974088B (en) Surface subsidence experimental rig and test method caused by a kind of water level Circularly liftable
CN103091471B (en) A kind of model accelerating rinse fill consolidation and test method thereof
CN104358188A (en) Filling construction method for collapsible loess subgrade
CN104131546A (en) Collapsible loess foundation treatment method
CN106988352B (en) Testing method for horizontal bearing capacity of single pile under consideration of soil body pre-consolidation and cyclic load
CN108508141A (en) A kind of field visualized experimental rig of geosynthetic reinforced pile supported embankments on soft soil 3 D deformation and its test method
CN106049557A (en) Indoor testing device for simulating grouting pile end post-grouting and testing method
CN104060637A (en) Geosynthetic centrifugal simulation test method adopting gravel piles for reinforcing a soft soil road embankment
CN103389260A (en) Laboratory simulation test method for researching underground water seepage obstruction caused by pile foundation
CN103290836B (en) Vacuum decompression compacting and consolidating construction method for soft foundation treatment
CN103410136B (en) A kind of boring method for embedding of soil moisture meter
CN208685680U (en) A kind of geosynthetic reinforced pile supported embankments on soft soil model test apparatus
Rastegarnia et al. Assessment of relationship between grouted values and calculated values in the Bazoft Dam Site
Wang et al. Influence of irrigation method on the infiltration in loess: field study in the Loess Plateau
CN106908349A (en) It is determined that the simple method with sandy gravel maximum dry density of building a dam
Furudoi The second phase construction of Kansai International Airport considering the large and long-term settlement of the clay deposits
CN206540536U (en) The rapidly solidified weak soil experimental rig of low Low Level vacuum method
CN108717082A (en) A kind of compaction of earth rock material quality continuous assessment method based on integrated sonic detection technology
CN109778831A (en) Ram-compaction gravel piles reinforce Artifical Fill Ground construction
CN205975653U (en) Independent bearing platform structure of soil child mould construction
CN105862943B (en) A kind of concrete spread foundation experimental rig and implementation method

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
C10 Entry into substantive examination
CB03 Change of inventor or designer information

Inventor after: Kong Linggang

Inventor after: Chen Renpeng

Inventor after: Lin Yanfei

Inventor after: Zhang Geqiang

Inventor after: Wang Shunyu

Inventor after: Zhan Liangtong

Inventor after: Chen Yunmin

Inventor before: Kong Linggang

Inventor before: Zhang Geqiang

Inventor before: Wang Shunyu

Inventor before: Zhan Liangtong

Inventor before: Chen Renpeng

Inventor before: Chen Yunmin

SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right

Effective date of registration: 20100809

Address after: Hangzhou City, Zhejiang province 310013 Xihu District Ancient Jade Road 166

Applicant after: Guangsha Construction Group Co., Ltd.

Co-applicant after: Zhejiang University

Address before: 310027 Hangzhou, Zhejiang Province, Xihu District, Zhejiang Road, No. 38, No.

Applicant before: Zhejiang University

COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 310027 NO.38, ZHEDA ROAD, XIHU DISTRICT, HANGZHOU CITY, ZHEJIANG PROVINCE TO: 310013 NO.166, YUGU ROAD, XIHU DISTRICT, HANGZHOU CITY, ZHEJIANG PROVINCE

Free format text: CORRECT: INVENTOR; FROM: KONG LINGGANG ZHANG GEQIANG WANG SHUNYU ZHAN LIANGTONG CHEN RENPENG CHEN YUNMIN TO: KONG LINGGANG CHEN RENPENG LIN YANFEI ZHANG GEQIANG WANG SHUNYU ZHAN LIANGTONG CHEN YUNMIN

ASS Succession or assignment of patent right

Owner name: GUANGSHA CONSTRUCTION GROUP CO., LTD.

Free format text: FORMER OWNER: ZHEJIANG UNIVERSITY

Effective date: 20100809

Owner name: ZHEJIANG UNIVERSITY

C41 Transfer of patent application or patent right or utility model
C53 Correction of patent for invention or patent application
GR01 Patent grant
C14 Grant of patent or utility model
RINS Preservation of patent right or utility model and its discharge
PP01 Preservation of patent right

Effective date of registration: 20161013

Granted publication date: 20110622

PD01 Discharge of preservation of patent
PD01 Discharge of preservation of patent

Date of cancellation: 20170803

Granted publication date: 20110622