CN106996970A - A kind of unsaturated soil nonlinear strength envelope shell model - Google Patents
A kind of unsaturated soil nonlinear strength envelope shell model Download PDFInfo
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- CN106996970A CN106996970A CN201710286182.7A CN201710286182A CN106996970A CN 106996970 A CN106996970 A CN 106996970A CN 201710286182 A CN201710286182 A CN 201710286182A CN 106996970 A CN106996970 A CN 106996970A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
A kind of unsaturated soil nonlinear strength envelope shell model, art is soil mechanics；At present, the widely used shearing strength model in unsaturated soils theory field is Mohr Coulomb destruction envelope (plane) models that Fredlund is proposed, but the application of the areal model is smaller, and corresponding soil shear strength calculation error is larger.Technical scheme main points are：Envelope shell (4) and " τ axles (3) and (σ ua) plane where axle (1) " and intersection meet relational expression：τ=c0[1+(σ‑ua)/σt]1/m, c0For soil body origin cohesion；σtFor soil body tensile strength；M is the parameter of control strength envelope curvature.It is any parallel to " τ axles (3) and (u on envelope shell (4)a‑uw) plane where axle (2) " and projection of the curve in the face meet：The present invention can be for more accurately calculating soil shear strength.
Description
Technical field
The present invention relates to soil mechanics field, it is proposed that a kind of unsaturated soil nonlinear strength envelope shell model.
Background technology
At present, the widely used shearing strength model in unsaturated soils theory field is the Mohr- that Fredlund is proposed
Coulomb destroys envelope (plane) model, and increasing research shows, when matric suction is less than air-entry value, matric suction
Associate angle of frictionWith effective angle of inner frictionIt is roughly equal；But when matric suction is incrementally increased,To be in non-linear
Reduce.So, the application of Fredlund areal model just receives certain limitation, and corresponding soil shear strength is calculated
It will appear from larger error.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention provides a kind of unsaturated soil nonlinear strength envelope shell model, can be with
Soil shear strength is more accurately calculated, with wider array of applicability.
The present invention solve its technical problem use technical scheme be：A kind of unsaturated soil nonlinear strength envelope shell mould
Type, it includes effect normal stress (σ-ua) axle (1), matric suction (ua-uw) (σ should for normal direction for axle (2) and shear stress τ axles (3)
Power, uaFor pore air pressure, uwFor pore water pressure)；The nonlinear strength envelope shell (4) of unsaturated soil falls in stress-space
In first octant (minimum value is located on τ axles), it is characterised in that：Shearing strength edge (σ-ua) axle (1) and (ua-uw) axle (2) is in
Nonlinear Monotone is incremented by and speedup monotone decreasing.
It is preferred that, envelope shell (4) and the intersection of plane where τ axles (3) and (σ-ua) axle (1) meet relational expression：τ=c0[1
+(σ-ua)/σt] 1/m, c0For soil body origin cohesion；σtFor soil body tensile strength；M is the parameter of control strength envelope curvature.
It is preferred that, it is any parallel to τ axles (3) and (u on envelope shell (4)a-uw) plane where axle (2) curve in the face
Projection is met：
(For the inclination angle of the increase of shear strength because of caused by matric suction increase, a, b, c are soil-water characteristic curve
Fredlund-Xing model curve fitting parameters, θsAnd θrRespectively saturated volume water content and residual volume water content,
For soil body effective angle of inner friction).(footnote form modifying)
The beneficial effects of the invention are as follows：It is to unsaturated soil to introduce nonlinear strength envelope shell model in unsaturated soil field
The important supplement of Mechanics Calculation and perfect.Nonlinear strength envelope shell model can preferably reflect the actual conditions of the soil body, again
Engineering design can be made to be partial to safety, the model has a good application prospect and promotional value in Geotechnical Engineering.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the non-linear envelope shell model of unsaturated soil；
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to protection scope of the present invention.
As shown in figure 1, the three axes in stress-space are represented respectively：Effective normal stress (σ-ua) axle (1), matrix suction
Power (ua-uw) axle (2) and shear stress τ axles (3), wherein, σ is normal stress, uaFor pore air pressure, uwFor pore water pressure.It is non-
Linear intensity envelope shell (4) falls in the first octant of stress-space (minimum value is located on τ axles), shearing strength edge (σ-ua) axle
And (u (1)a-uw) axle (2) in Nonlinear Monotone be incremented by and speedup monotone decreasing.
Envelope shell (4) and " τ axles (3) and (σ-ua) plane where axle (1) " and intersection meet relational expression：τ=c0[1+(σ-
ua)/σt]1/m, c0For soil body origin cohesion；σtFor soil body tensile strength；M is the parameter of control strength envelope curvature.Envelope shell
(4) it is any parallel to " τ axles (3) and (u ona-uw) plane where axle (2) " and projection of the curve in the face meet：
(For the inclination angle of the increase of shear strength because of caused by matric suction increase, a, b, c are soil-water characteristic curve
Fredlund-Xing model curve fitting parameters, θsAnd θrRespectively saturated volume water content and residual volume water content,
For soil body effective angle of inner friction).
Claims (3)
1. a kind of unsaturated soil nonlinear strength envelope shell model, it includes effect normal stress (σ-ua) axle (1), matric suction
(ua-uw) (σ is normal stress, u for axle (2) and shear stress τ axles (3)aFor pore air pressure, uwFor pore water pressure)；Unsaturated soil
Nonlinear strength envelope shell (4) fall in the first octant of stress-space (minimum value be located at τ axles on), it is characterised in that：It is anti-
Intensity is cut along (σ-ua) axle (1) and (ua-uw) axle (2) in Nonlinear Monotone be incremented by and speedup monotone decreasing.
2. unsaturated soil nonlinear strength envelope shell model according to claim 1, it is characterised in that：Envelope shell (4) and τ
Axle (3) and (σ-ua) intersection of plane where axle (1) meets relational expression：τ=c0[1+(σ-ua)/σt]1/m, c0Initially glued for the soil body
Poly- power；σtFor soil body tensile strength；M is the parameter of control strength envelope curvature.
3. unsaturated soil nonlinear strength envelope shell model according to claim 2, it is characterised in that：Bag
It is any parallel to τ axles (3) and (u on network shell (4)a-uw) projection of the curve in the face of plane where axle (2) meet：
For the inclination angle of the increase of shear strength because of caused by matric suction increase, a, b, c are soil-water characteristic curve
Fredlund-Xing model curve fitting parameters, θsAnd θrRespectively saturated volume water content and residual volume water content,
For soil body effective angle of inner friction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710286182.7A CN106996970B (en) | 2017-04-26 | 2017-04-26 | A kind of soil shear strength calculation method based on unsaturated soil nonlinear strength envelope shell model |
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| CN201710286182.7A CN106996970B (en) | 2017-04-26 | 2017-04-26 | A kind of soil shear strength calculation method based on unsaturated soil nonlinear strength envelope shell model |
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| CN106996970A true CN106996970A (en) | 2017-08-01 |
| CN106996970B CN106996970B (en) | 2019-04-05 |
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| CN201710286182.7A Expired - Fee Related CN106996970B (en) | 2017-04-26 | 2017-04-26 | A kind of soil shear strength calculation method based on unsaturated soil nonlinear strength envelope shell model |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169458A (en) * | 2017-12-27 | 2018-06-15 | 辽宁工程技术大学 | A kind of device and its measuring method of the three-dimensional stress constraint for measuring soil |
| CN109211688A (en) * | 2018-09-19 | 2019-01-15 | 华北水利水电大学 | A kind of quick method for judging whether to destroy after unsaturated soil stress |
| CN114047100A (en) * | 2021-10-20 | 2022-02-15 | 长沙理工大学 | Test device for measuring rising height and rate of porous medium capillary water |
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| CN102305845A (en) * | 2011-07-28 | 2012-01-04 | 河北建设勘察研究院有限公司 | Method for rapidly detecting area unsaturated soil shearing strength |
| KR20120068103A (en) * | 2010-12-14 | 2012-06-27 | 연세대학교 산학협력단 | Method for tri-axial compression test of unsaturated soils and intermediate soils |
| CN104091068A (en) * | 2014-07-07 | 2014-10-08 | 长安大学 | Method for establishing unified strength theory of unsaturated soil |
| CN105467098A (en) * | 2015-11-16 | 2016-04-06 | 天津城建大学 | Correction method for unsaturated soil soil-water characteristic curve based on axis translation technique test |
| CN105928803A (en) * | 2016-07-15 | 2016-09-07 | 中南大学 | Soil shear strength parameter in-situ test apparatus and test method thereof |
| CN106289979A (en) * | 2016-09-09 | 2017-01-04 | 中国地质大学（武汉） | Unsaturated soil tensile strength test device and method of testing |
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2017
- 2017-04-26 CN CN201710286182.7A patent/CN106996970B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120068103A (en) * | 2010-12-14 | 2012-06-27 | 연세대학교 산학협력단 | Method for tri-axial compression test of unsaturated soils and intermediate soils |
| CN102305845A (en) * | 2011-07-28 | 2012-01-04 | 河北建设勘察研究院有限公司 | Method for rapidly detecting area unsaturated soil shearing strength |
| CN104091068A (en) * | 2014-07-07 | 2014-10-08 | 长安大学 | Method for establishing unified strength theory of unsaturated soil |
| CN105467098A (en) * | 2015-11-16 | 2016-04-06 | 天津城建大学 | Correction method for unsaturated soil soil-water characteristic curve based on axis translation technique test |
| CN105928803A (en) * | 2016-07-15 | 2016-09-07 | 中南大学 | Soil shear strength parameter in-situ test apparatus and test method thereof |
| CN106289979A (en) * | 2016-09-09 | 2017-01-04 | 中国地质大学（武汉） | Unsaturated soil tensile strength test device and method of testing |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169458A (en) * | 2017-12-27 | 2018-06-15 | 辽宁工程技术大学 | A kind of device and its measuring method of the three-dimensional stress constraint for measuring soil |
| CN108169458B (en) * | 2017-12-27 | 2020-07-31 | 辽宁工程技术大学 | Device and method for measuring three-dimensional stress state of soil |
| CN109211688A (en) * | 2018-09-19 | 2019-01-15 | 华北水利水电大学 | A kind of quick method for judging whether to destroy after unsaturated soil stress |
| CN109211688B (en) * | 2018-09-19 | 2021-03-26 | 华北水利水电大学 | Method for rapidly judging whether unsaturated soil is damaged or not after stress |
| CN114047100A (en) * | 2021-10-20 | 2022-02-15 | 长沙理工大学 | Test device for measuring rising height and rate of porous medium capillary water |
| CN114047100B (en) * | 2021-10-20 | 2023-12-15 | 长沙理工大学 | Test device for measuring capillary water elevation and capillary water velocity of porous medium |
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| CN106996970B (en) | 2019-04-05 |
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Granted publication date: 20190405 Termination date: 20200426 |