CN104947646B - Determine the method for coarse-grained soil bearing capacity under great burying - Google Patents
Determine the method for coarse-grained soil bearing capacity under great burying Download PDFInfo
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- CN104947646B CN104947646B CN201510369216.XA CN201510369216A CN104947646B CN 104947646 B CN104947646 B CN 104947646B CN 201510369216 A CN201510369216 A CN 201510369216A CN 104947646 B CN104947646 B CN 104947646B
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Abstract
The present invention relates to and a kind of determine the method for coarse-grained soil bearing capacity under great burying, the particularly a kind of method of coarse-grained soil bearing capacity under determination great burying being applied to hydroelectric project field.The present invention provides a kind of can quick and precisely determine the method for coarse-grained soil bearing capacity under great burying according to the parameter of some coarse-grained soils easily measured, including following step: a, collect the in-situ mechanical test value of deep covering layer；B, soil body dry density, mean diameter are carried out statistical correlation analysis with corresponding bearing capacity；C, set up the relational expression of bearing capacity；Soil body dry density and soil body mean diameter under d, acquisition great burying；E, soil body dry density and soil body mean diameter are substituted in relational expression and draw bearing capacity.According to substantial amounts of deep covering layer in-situ mechanical test data, by dependency and statistical analysis, setting up dry density, mean diameter and great burying coarse-grained soil bearing capacity, empirical equation, methodological science is reasonable, simple and easy to do, it is adaptable to Recent Epoch normal consolidation great burying coarse-grained soil.
Description
Technical field
The present invention relates to and a kind of determine the method for coarse-grained soil bearing capacity under great burying, the particularly a kind of method of coarse-grained soil bearing capacity under determination great burying being applied to hydroelectric project field.
Background technology
The surveying methods such as shallow table coarse-grained soil cover layer can be sampled by vertical shaft, test in situ find out the bearing capacity of its soil body.At present under great burying, (buried depth is more than 15m) coarse-grained soil bearing capacity is determined and is depended on in-situ test in drill hole sampling and hole, drill hole sampling is affected by bore process has certain deviation with actual, also can there is certain deviation with actual in in-situ test value in great burying situation lower opening, has in-situ test in some holes even to exceed the scope of application.Current great burying coarse-grained soil cover layer bearing capacity is determined and is aided with a small amount of boring in-situ test all in accordance with the identical grating soil body of shallow table and draws according to Engineering Geologic Analogy, the deviation certain with physical presence, and major part ratio is more conservative, too conservative when causing design.Therefore prior art can quick and precisely determine the method for coarse-grained soil bearing capacity under great burying according to the parameter of some coarse-grained soils easily measured but without a kind of.
Summary of the invention
The technical problem to be solved is to provide a kind of can quick and precisely determine the method for coarse-grained soil bearing capacity under great burying according to the parameter of some coarse-grained soils easily measured.
For solving above-mentioned technical problem, the method for coarse-grained soil bearing capacity under the determination great burying that the present invention adopts, including following step:
A, collect deep covering layer in-situ mechanical test value, including the bearing capacity of soil body dry density, soil body mean diameter and correspondence；
B, the soil body dry density tested by deep covering layer in-situ mechanical, mean diameter carry out statistical correlation analysis with corresponding bearing capacity respectively；
If the aforementioned b step statistic correlation analysis of c show that bearing capacity is dyadic correlation with soil body dry density and soil body mean diameter, then the method for multiple linear regressive analysis is adopted to set up the relational expression of bearing capacity and soil body dry density and soil body mean diameter；If aforementioned b step statistic correlation analysis show that bearing capacity and soil body dry density are that unitary is relevant, then the method for simple regression analysis is adopted to set up the relational expression of bearing capacity and soil body dry density；If aforementioned b step statistic correlation analysis show that bearing capacity is relevant to soil body mean diameter unitary, then the method for simple regression analysis is adopted to set up the relational expression of bearing capacity and soil body mean diameter；Statistical analysis, bearing capacity is dyadic correlation with soil body dry density and soil body mean diameter, and its empirical equation is: bearing capacity [R]=1.53564 ρd+0.000637D50-2.8374, wherein bearing capacity [R], dry density ρd, mean diameter D50Measurement unit is MPa, g/cm respectively3、mm；
Soil body dry density and soil body mean diameter under d, acquisition great burying；
E, the soil body dry density measured and soil body mean diameter are substituted in the relational expression of step c calculate bearing capacity in Step d.
Further, using rock stamen mean particle size of holing as soil body mean diameter under great burying in Step d.
Further, the sampling group number of described boring rock stamen is more than 10 groups.
Further, Step d adopts formula Y=0.007X+ ρd0, calculate and obtain soil body dry density under great burying, wherein Y is soil body dry density, and wherein X is coarse-grained soil buried depth, ρd0For earth's surface coarse-grained soil dry density.
Further, douche or sand replacement method is adopted to obtain described earth's surface coarse-grained soil dry density.
Further, sand replacement method is adopted to obtain described earth's surface coarse-grained soil dry density.
The medicine have the advantages that the present invention provides a kind of and can quick and precisely determine the method for coarse-grained soil bearing capacity under great burying according to the parameter of some coarse-grained soils easily measured, it is adaptable to Recent Epoch normal consolidation great burying coarse-grained soil.The method is simple and easy to do, for determining that great burying coarse-grained soil mechanical property provides another kind of approach, it is not necessary to a large amount of in-situ tests, it is possible to relatively limits saves construction costs.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention；
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As it is shown in figure 1, for solving above-mentioned technical problem, the method for coarse-grained soil bearing capacity under the determination great burying that the present invention adopts, including following step:
A, collect deep covering layer in-situ mechanical test value, including the bearing capacity of soil body dry density, soil body mean diameter and correspondence；
B, the soil body dry density tested by deep covering layer in-situ mechanical, mean diameter carry out statistical correlation analysis with corresponding bearing capacity respectively；
If the aforementioned b step statistic correlation analysis of c show that bearing capacity is dyadic correlation with soil body dry density and soil body mean diameter, then the method for multiple linear regressive analysis is adopted to set up the relational expression of bearing capacity and soil body dry density and soil body mean diameter；If aforementioned b step statistic correlation analysis show that bearing capacity and soil body dry density are that unitary is relevant, then the method for simple regression analysis is adopted to set up the relational expression of bearing capacity and soil body dry density；If aforementioned b step statistic correlation analysis show that bearing capacity is relevant to soil body mean diameter unitary, then the method for simple regression analysis is adopted to set up the relational expression of bearing capacity and soil body mean diameter；Statistical analysis, bearing capacity is dyadic correlation with soil body dry density and soil body mean diameter, and its empirical equation is: bearing capacity [R]=1.53564 ρd+0.000637D50-2.8374, wherein bearing capacity [R], dry density ρd, mean diameter D50Measurement unit is MPa, g/cm respectively3、mm；
Soil body dry density and soil body mean diameter under d, acquisition great burying；
E, the soil body dry density measured and soil body mean diameter are substituted in the relational expression of step c calculate bearing capacity in Step d.
Using rock stamen mean particle size of holing as soil body mean diameter under great burying in Step d.The sampling group number of described boring rock stamen is more than 10 groups.When the sampling group number of rock stamen of holing is more than 10 groups, its mean diameter comparision contents is actual close to the soil body, it is possible to the particle diameter composition situation of reflection cover layer, makes boring rock stamen mean particle size can more accurately reflect coarse-grained soil mean particle size under great burying.Step d adopts formula Y=0.007X+ ρd0, calculate and obtain soil body dry density under great burying, wherein Y is soil body dry density, and wherein X is coarse-grained soil buried depth, ρd0For earth's surface coarse-grained soil dry density.Adopting douche or sand replacement method to obtain described earth's surface coarse-grained soil dry density can also adopt sand replacement method to obtain described earth's surface coarse-grained soil dry density.
Embodiment: collect in-situ mechanical test value after deep covering layer power station is excavated, including the bearing capacity of soil body dry density, soil body mean diameter and correspondence.Substantial amounts of in-situ test soil body dry density, soil body average size are carried out statistical correlation analysis with corresponding bearing capacity respectively.According to coarse-grained soil in-situ test bearing capacity and its soil body dry density, soil body mean diameter experimental data table (see table 1), then its dependency (see table 2) is analyzed, known soil bearing capacity and its dry density correlation coefficient reach 0.748, it is 0.527 with mean diameter correlation coefficient, dependency is obvious, then adopts multiple linear regressive analysis to set up rule-of-thumb relation.Statistical analysis, its empirical equation is: bearing capacity [R]=1.53564 ρd+0.000637D50-2.8374, wherein [R], ρd、D50Measurement unit is MPa, g/cm respectively3、mm.Its standard error is 0.116MPa, R2=0.566, its dependency is more apparent, can be used for estimating great burying coarse-grained soil foundation bearing capacity.
Table 1 coarse-grained soil bearing capacity, dry density, mean diameter tables of data
Table 2 dependency relation analytical table
| Row 1 | Row 2 | Row 3 | |
| Row 1 | 1 | ||
| Row 2 | 0.748 | 1 | |
| Row 3 | 0.527 | 0.623 | 1 |
Take boring rock stamen mean particle size and determine coarse-grained soil mean particle size under great burying.Conventional method such as douche or sand replacement method is first adopted to obtain earth's surface coarse-grained soil dry density, rear employing Y=0.007X+ ρd0Calculating coarse-grained soil dry density under great burying, wherein Y is dry density under great burying, and X is coarse-grained soil buried depth, ρd0For earth's surface coarse-grained soil dry density.Soil body dry density, soil body mean diameter under great burying are substituted into empirical equation, obtains coarse-grained soil bearing capacity.Under the determination great burying that the application adopts, the methodological science of coarse-grained soil bearing capacity is reasonable, simple and easy to do, for determining that great burying coarse-grained soil mechanical property provides another kind of approach, it is not necessary to a large amount of in-situ tests, it is possible to relatively limits saves construction costs.
Claims (6)
1. determine the method for coarse-grained soil bearing capacity under great burying, including following step:
A, collect deep covering layer in-situ mechanical test value, including the bearing capacity of soil body dry density, soil body mean diameter and correspondence；
B, the soil body dry density tested by deep covering layer in-situ mechanical, mean diameter carry out statistical correlation analysis with corresponding bearing capacity respectively；
If the aforementioned b step statistic correlation analysis of c show that bearing capacity is dyadic correlation with soil body dry density and soil body mean diameter, then the method for multiple linear regressive analysis is adopted to set up the relational expression of bearing capacity and soil body dry density and soil body mean diameter；If aforementioned b step statistic correlation analysis show that bearing capacity and soil body dry density are that unitary is relevant, then the method for simple regression analysis is adopted to set up the relational expression of bearing capacity and soil body dry density；If aforementioned b step statistic correlation analysis show that bearing capacity is relevant to soil body mean diameter unitary, then the method for simple regression analysis is adopted to set up the relational expression of bearing capacity and soil body mean diameter；Statistical analysis, bearing capacity is dyadic correlation with soil body dry density and soil body mean diameter, and its empirical equation is: bearing capacity [R]=1.53564 ρd+0.000637D50-2.8374, wherein bearing capacity [R], dry density ρd, mean diameter D50Measurement unit is MPa, g/cm respectively3、mm；
Soil body dry density and soil body mean diameter under d, acquisition great burying；
E, the soil body dry density measured and soil body mean diameter are substituted in the relational expression of step c calculate bearing capacity in Step d.
2. determine the method for coarse-grained soil bearing capacity under great burying as claimed in claim 1, it is characterised in that: using rock stamen mean particle size of holing as soil body mean diameter under great burying in Step d.
3. determine the method for coarse-grained soil bearing capacity under great burying as claimed in claim 2, it is characterised in that: the sampling group number of described boring rock stamen is more than 10 groups.
4. determine the method for coarse-grained soil bearing capacity under great burying as claimed in claim 1, it is characterised in that: in Step d, adopt formula Y=0.007X+ ρd0, calculate and obtain soil body dry density under great burying, wherein Y is soil body dry density, and wherein X is coarse-grained soil buried depth, ρd0For earth's surface coarse-grained soil dry density.
5. determine the method for coarse-grained soil bearing capacity under great burying as claimed in claim 4, it is characterised in that: adopt sand replacement method to obtain described earth's surface coarse-grained soil dry density.
6. determine the method for coarse-grained soil bearing capacity under great burying as claimed in claim 4, it is characterised in that: adopt douche to obtain described earth's surface coarse-grained soil dry density.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250866A (en) * | 2007-12-21 | 2008-08-27 | 中国科学院水利部成都山地灾害与环境研究所 | Method for rapidly testing in situ foundation bearing capacity and deformation modulus |
| CN104715108A (en) * | 2015-02-28 | 2015-06-17 | 天津市市政工程研究院 | Method for determining optimal scheme of processing soft soil roadbed through lime |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250866A (en) * | 2007-12-21 | 2008-08-27 | 中国科学院水利部成都山地灾害与环境研究所 | Method for rapidly testing in situ foundation bearing capacity and deformation modulus |
| CN104715108A (en) * | 2015-02-28 | 2015-06-17 | 天津市市政工程研究院 | Method for determining optimal scheme of processing soft soil roadbed through lime |
Non-Patent Citations (1)
| Title |
|---|
| 有关砂土地基承载力数值解析问题的讨论;彭芳乐等;《岩土力学》;20041130;第25卷(第增刊期);第475-478页 * |
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