CN105911254A - Dichotomy-based testing method for cohesive soil water buoyance reduction coefficient - Google Patents
Dichotomy-based testing method for cohesive soil water buoyance reduction coefficient Download PDFInfo
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- CN105911254A CN105911254A CN201610388436.1A CN201610388436A CN105911254A CN 105911254 A CN105911254 A CN 105911254A CN 201610388436 A CN201610388436 A CN 201610388436A CN 105911254 A CN105911254 A CN 105911254A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses a dichotomy-based testing method for the cohesive soil water buoyance reduction coefficient. The method comprises the following steps that 1, a model pit is prepared and filled with cohesive soil, multiple barrels are evenly buried in the cohesive soil and divided into groups, objects with the same weight as the soil in deeply-buried range are placed in each group of barrels, and water is injected into the model pit; 2, the weight of the barrels is adjusted; 3, the water level of the model pit is adjusted; 4, model testing is started, and the floating time of the floating barrel is determined; 5, according to the analysis of the obtained test results, the range of the reduction coefficient is determined. According to the method, compared with a model test, the stress state of a deep foundation located in the cohesive soil foundation can be truly stimulated, so that buoyancy on the foundation under different water levels is tested, the critical value of the foundation weight of the floating state and the non-floating state is found according to the mathematical dichotomy principle, and the reduction coefficient of water buoyance is calculated within the error meeting engineering practical requirements.
Description
Technical field
The present invention relates to the test method of a kind of cohesive soil water reduction factor of buoyancy based on two way classification, be suitable for
In calculating cohesive soil ground base water reduction factor of buoyancy.
Background technology
Along with the development of China's economy, urban construction scale constantly expands, in order to meet city layout,
Building and the needs of social function, the mankind are the most increasingly developed towards the underground space, a large amount of city undergrounds,
Underground large-scale synthesis body and the construction of the basement of skyscraper and underground garage etc., underground space court
The exploitation the degree of depth and range significantly increases, but can run into substantial amounts of subsoil water during building simultaneously
Processing, the generation even causing many engineering accidents having, therefore the Anti-floating design of underground structure is with anti-
Floating treatment measures become one of engineering design, construction, management, prospecting etc. key issue and a common concern,
Increasingly it is subject to people's attention.
Existing technology is mainly based upon classical hydraulic Archimedes' principle to carry out the meter of water buoyancy
Calculating, when the basis of building is placed in Clayey Soil Ground, structure foundation can be produced vertical by subsoil water
Buoyancy upwards, traditional method all assumes that stickiness subsoil water is uniformly distributed in stickiness ground, it is assumed that
Subsoil water is filled with the interpore whole spaces of solid particle, but the subsoil water in the ground of reality is not
It is uniformly distributed, and solid particle is not to be uniformly distributed, so having one during actual calculating
Fixed error.Also has the model test result of present a lot of water reduction factor of buoyancies and actual water buoyancy
Result is different, and have is even contrary, is primarily due to method of testing and the research technique of various model test
Difference, and the instrument used by test is different, draws different test results.And now with a lot
Practical Project does not accounts for the reduction coefficient of water buoyancy, causes in engineering reality, increases architectural engineering
Investment in resisting buoyancy of foundation design, causes the waste of resource and cost higher.So calculating ground accurately
The water reduction factor of buoyancy of base, has important social meaning.
The information being disclosed in this background section is merely intended to increase the reason of the general background to the present invention
Solve, and be not construed as recognizing or imply in any form that this information structure is for this area general technology
Prior art well known to personnel.
Summary of the invention
It is an object of the invention to provide the test of a kind of cohesive soil water reduction factor of buoyancy based on two way classification
Method, thus overcome result of the test and the actual water buoyancy knot of the model of cohesive soil water reduction factor of buoyancy
Fruit is different, makes the shortcoming that construction costs is higher.
For achieving the above object, the invention provides a kind of cohesive soil of based on two way classification water floating reduction system
The test method of number, comprises the following steps:
(1) preparation model hole, inserts cohesive soil in model is cheated, is uniformly distributed embedment many in cohesive soil
Multiple buckets are grouped by individual bucket, often the thing weight of the weight such as placement and the buried scope soil body in group bucket, toward mould
Water filling in type hole；
(2) weight of bucket is regulated；, after treating that in model hole, the soil body is the most saturated, will often organize in multiple bucket
Thing be heavily adjusted, bucket weight is arranged according to certain linear variability law；
(3) water level in regulation model hole, water filling in model hole, until it reaches in EXPERIMENTAL DESIGN scheme
Design water level, often the water level of group bucket test is different, arranges according to certain linear variability law；
(4) carry out test observation, determine the floatation time of upper keg float；
(5, according to the test result analysis of gained, find out the heaviest bucket floated and the lightest bucket not floated, from
And define the scope of synthetical reduction coefficient.
Preferably, in technique scheme, described step (1) is often organized bucket and contains 4 stavings.
Preferably, in technique scheme, described step (1) stands 1 month after water filling in model hole.
Preferably, in technique scheme, vaseline smeared by the bucket wall of multiple described buckets.
Preferably, in technique scheme, carrying out test observation in described step (4) is to open monitoring
System, every 10min shoots a photo, persistently carries out many days, and after many days, each bucket of detailed inspection floats
Situation, and transfer photographic head shooting photo contrast one by one, determine the floatation time of upper keg float.
Compared with prior art, there is advantages that
(1) test method of present invention cohesive soil based on two way classification water reduction factor of buoyancy, mainly pin
Accurate calculating to the reduction factor of buoyancy on Clayey Soil Ground basis, on the basis of contrast model is tested,
Can truly simulate and be positioned at the stress of deep foundation in clay foundation, be subject to basis under the different water level of test
The buoyancy size arrived, and buoyancy process over time, then according to mathematical two way classification principle,
Basis weight is found to get involved floating state and the marginal value of non-rising state, it is ensured that to meet engineering actual demand
Error in, then calculate the reduction coefficient of water buoyancy according to poised state, and the present invention not only examines
Consider the reduction coefficient to water buoyancy, it is also contemplated that frictional force, basis and the bottom soil between basis and the soil body
Adhesion of body etc., belongs to the reduction factor of buoyancy of broad sense, it is considered to extrinsic factor scope more extensive.
(2) model test of the present invention is simple, it is not necessary to by test instrunment, just can by contrast test with
The critical weight of stickiness foundation is found out in parallel test.The most continuous two way classification finds out stickiness
The critical weight of foundation；The basis in Clayey Soil Ground can be reflected really, at groundwater effect
Under stress, and the experiment conclusion drawn by model test and experimental phenomena is the most understandable.
(3) experimental facilities required for the present invention is the simplest, Plastic Drum, digital video system, fixed
Time shooting other auxiliary equipments such as software, photographic head, computer, vaseline；The mathematics that the present invention relates to
Calculate and model test simply, easily operates and understands, have in actual engineer applied and the most easily grasp
The feature made, and the water reduction factor of buoyancy calculated is the reduction coefficient of broad sense, because calculating
During by all be conducive to the factor such as frictional force of anti-floating, adhesions etc. be all included into inside reduction,
Therefore the broad sense reduction coefficient calculated is in the case of ensureing engineering safety, more economical, it is possible to save anti-floating
The expense of design.
Accompanying drawing explanation
Fig. 1 is according in the test method of the cohesive soil water reduction factor of buoyancy based on two way classification of the present invention
The structural representation in model hole.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is described in detail, it is to be understood that this
The protection domain of invention is not limited by detailed description of the invention.
Explicitly indicate that unless otherwise other, otherwise in entire disclosure and claims, term " bag
Include " or its conversion as " comprising " or " including " etc. will be understood to comprise stated element or
Ingredient, and do not get rid of other element or other ingredient.
The test method of present invention cohesive soil based on two way classification water reduction factor of buoyancy, concrete grammar is as follows:
First carry out the water floatation test of n group different buried depth bucket, then consider the consolidation settlement of foundation soil body
With the floating of bucket, add in bucket and the initial weight M0 on basis, and the bucket heavy phase of each barrel together and is
M, is finally embedded in bucket under different test depth H, repeats often to organize experiment at least 3 times, each group
Test with the bucket of 4 volume and weight casings, carry out 3n test altogether.
Specifically include following steps:
(1) prepare a model hole 1 before test is carried out, simulate with bucket 2, then by clay according to certain
Thickness (100-200mm), one layer of layering is inserted in model hole, to certain height, and successively presses
Real；Require to design during backfill cohesive soil buried depth H of bucket according to the design of testing program,
Then 4 buckets are buried in the earth according to position shown in (such as Fig. 1), then will with buried depth in the range of etc. weight
Soil body M0It is put in bucket.After waiting that the clay in bucket is filled in, then inject a certain amount of water in model is cheated,
Make the water surface just flood clay layer, then sufficient standing, wait that the clay soil body is saturated；
(2) regulate the weight of bucket, treat that the cohesive soil in model hole is the most saturated, then by the soil in 4 buckets
It is M that body weight adjusts weight according to the Changing Pattern of linear decrease1、M2、M3And M4, and often organize reality
Test in triplicate, carry out the experiment of n group；
(3) water level in regulation model hole, after treating the recanalization of bucket on ground foundation simulation basis, note in hole
Water, until it reaches design water level H in testing program, the water level often organizing experiment is different, according to necessarily
Linear variability law arrange；
(4) test observation is carried out, water level in Holding Model hole and after other work debugged, so
After open the digital vedio recording monitoring system being placed in experiment side, carry out test data sheet and observation, set number
Code monitoring system automatically snaps an experimental status figure, Continuous Observation N the most at regular intervals1My god, N1
Rear each barrel of itemized record float situation, and transfer the photo that digital video system records carry out right
Than the time floated up determining bucket；
(5) according to the test result analysis of gained, N is passed through1It test observation, finds out float the heaviest
Bucket and the lightest bucket not floated, then determine the span of water reduction factor of buoyancy by two way classification.
The aforementioned description to the specific illustrative embodiment of the present invention illustrates that and the purpose of illustration.
These descriptions are not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned
Teaching, can much change and change.The purpose selected exemplary embodiment and describe exists
In explaining the certain principles of the present invention and actual application thereof, so that those skilled in the art can be real
Now and utilize the various different exemplary of the present invention and various different selection and change.
The scope of the present invention is intended to be limited by claims and equivalents thereof.
Claims (5)
1. the test method of a cohesive soil water reduction factor of buoyancy based on two way classification, it is characterised in that
Comprise the following steps:
(1) preparation model hole, inserts cohesive soil in model is cheated, is uniformly distributed embedment many in cohesive soil
Multiple buckets are grouped by individual bucket, often the thing weight of the weight such as placement and the buried scope soil body in group bucket, toward mould
Water filling in type hole；
(2) regulate the weight of bucket, after treating that in model hole, the soil body is the most saturated, will often organize in multiple bucket
Thing is heavily adjusted, and bucket weight is arranged according to certain linear variability law；
(3) water level in regulation model hole, water filling in model hole, until it reaches in EXPERIMENTAL DESIGN scheme
Design water level, often the water level of group bucket test is different, arranges according to certain linear variability law；
(4) carry out test observation, determine the floatation time of upper keg float；
(5) test result analysis, by test observation, find out the heaviest bucket floated and do not float the lightest
Bucket, thus define the scope of synthetical reduction coefficient.
The test side of cohesive soil water reduction factor of buoyancy based on two way classification the most according to claim 1
Method, it is characterised in that often organize bucket in described step (1) and contain 4 stavings.
The test side of cohesive soil water reduction factor of buoyancy based on two way classification the most according to claim 1
Method, it is characterised in that described step (1) stands 1 month after water filling in model hole.
The test side of cohesive soil water reduction factor of buoyancy based on two way classification the most according to claim 1
Method, it is characterised in that vaseline smeared by the bucket wall of multiple described buckets.
The test side of cohesive soil water reduction factor of buoyancy based on two way classification the most according to claim 1
Method, it is characterised in that carrying out test observation in described step (4) is, opens monitoring system, every 10min
Shoot a photo, persistently carry out many days, after many days each bucket of detailed inspection float situation, and transfer and take the photograph
As the photo of head shooting contrasts one by one, determine the floatation time of upper keg float.
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| CN201610388436.1A CN105911254B (en) | 2016-06-02 | 2016-06-02 | The test method of cohesive soil water buoyancy reduction coefficient based on dichotomy |
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| CN201610388436.1A CN105911254B (en) | 2016-06-02 | 2016-06-02 | The test method of cohesive soil water buoyancy reduction coefficient based on dichotomy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555168A (en) * | 2018-12-11 | 2019-04-02 | 兰州理工大学 | A kind of building liquid buoyancy laboratory testing rig and test method |
| CN116991679A (en) * | 2023-09-26 | 2023-11-03 | 四川华鲲振宇智能科技有限责任公司 | Method for automatically distributing optimal thread number during memory pressure test |
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| CN101806669A (en) * | 2010-04-14 | 2010-08-18 | 同济大学 | Testing system of high-precision still water buoyancy model with underground structure |
| CN203480738U (en) * | 2013-09-30 | 2014-03-12 | 郭敬明 | Water buoyancy demonstrator for teaching |
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2016
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806669A (en) * | 2010-04-14 | 2010-08-18 | 同济大学 | Testing system of high-precision still water buoyancy model with underground structure |
| CN203480738U (en) * | 2013-09-30 | 2014-03-12 | 郭敬明 | Water buoyancy demonstrator for teaching |
Non-Patent Citations (3)
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| 宋林辉等: ""粘土地基中的水浮力试验研究"", 《水文地质工程地质》 * |
| 梅国雄等: ""地下水浮力折减试验研究"", 《岩土工程学报》 * |
| 王旭东等: ""被动土压力折减少系数的研究"", 《工业建筑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555168A (en) * | 2018-12-11 | 2019-04-02 | 兰州理工大学 | A kind of building liquid buoyancy laboratory testing rig and test method |
| CN109555168B (en) * | 2018-12-11 | 2024-04-09 | 兰州理工大学 | Building liquid buoyancy indoor test device and test method |
| CN116991679A (en) * | 2023-09-26 | 2023-11-03 | 四川华鲲振宇智能科技有限责任公司 | Method for automatically distributing optimal thread number during memory pressure test |
| CN116991679B (en) * | 2023-09-26 | 2023-12-08 | 四川华鲲振宇智能科技有限责任公司 | Method for automatically distributing optimal thread number during memory pressure test |
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