CN101876169B - Method for testing soil shear strength of slope in situ - Google Patents
Method for testing soil shear strength of slope in situ Download PDFInfo
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- CN101876169B CN101876169B CN2010101838107A CN201010183810A CN101876169B CN 101876169 B CN101876169 B CN 101876169B CN 2010101838107 A CN2010101838107 A CN 2010101838107A CN 201010183810 A CN201010183810 A CN 201010183810A CN 101876169 B CN101876169 B CN 101876169B
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- shear strength
- shearing ring
- shear
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a method for testing the soil shear strength of a slope in situ, which comprises the following steps of: A1, on a slope with in-place soil, inserting a shear ring into the soil to be tested; A2, stripping soil in the direction of fall of the slope; A3, uniformly applying traction in the dip slope direction to the shear ring, and detecting an angular displacement; and A4, recording the change of the traction before and after the displacement, analyzing the maximum value of the traction in the dip slope direction, and acquiring the shear strength values of the slopes with different gradients and different depths in the dip slope direction through a unit conversion relation between force and the soil shear strength. The invention provides a method for testing the soil shear strength of a slope in situ by considering the dip slope shear direction and soil shear surface positions (different depths), which is used for determining a soil erosion resistant parameter in the field of soil and water conservation.
Description
Technical field
The present invention relates to the water and soil conservation field, relate in particular to a kind of method of in-site detecting topsoil shear strength.
Background technology
China is one of the most serious country of soil erosion in the world, and soil erosion area accounts for 1/3 of territory total area, and shows as the intensity height, complex genesis, and harm is serious, and is the strongest with the black earth soil erosion in the loess of northwest, southern red soil, northeast especially.The whole nation 1.07 * 108km
2Arable land, slope 3.330 * 107km is arranged in the arable land
2, account for 1/3 of total area under cultivation.Ploughing in the slope is the source of soil erosion, and not only a large amount of silts are dumped and endangered the downstream flood control safety down, and more seriously water, soil, loose amount run off, and cause fertility decline agricultural production low and unstable.
The numerous intensity of soil erosion and soil anti-scouribilities of studies show that are closely related.Use soil erodibility abroad, be further divided into separability and handlability.China is commonly referred to as the soil corrosion resistance, uses anti-impact corrosion stability one speech more.China's soil erodibility that begins one's study from the fifties, but adopt the soil corrosion resistance more.Zhu Xianmo is divided into impact resilience and corrosion stability with the soil corrosion resistance, the definition of Jiang Deqi and Zhu Xianmo are further clear and definite impact resilience and corrosion stability.The two is referred to as soil anti-impact corrosion stability.Impact resilience mainly refers to the mechanical damage effect to soil such as soil opposing wind, water, and corrosion stability mainly refers to dispersion and the suspension effect of soil opposing water to grogs.The division of considering soil anti-scouribility and corrosion stability from soil erosion mechanism is significant, but from experimental viewpoint, still impact resilience and corrosion stability can't be separated at present.Soil erodibility and corrosion resistance are two sides of a problem in essence: the former is meant the sensitiveness of soil to corrosion function, the latter is meant the resistivity of soil to corrosion function, so the two has all reflected the relation of the soil behaviour and the soil erosion.
The soil erosion is the main cause that causes land resources to degenerate and even thoroughly destroy.Quantitatively calculating soil loss amount is rationally to utilize and manage one of scientific basis of land resources.Soil anti-scouribility is an important indicator of quantitatively calculating soil erosion, is actually the performance of the anti-current scour of soil, shear ability.The shear strength of soil is meant the limit capacity of soil body opposing shear failure, the shear stress when its size just equals shear failure on the slide plane.Can reflect the ability that soil body opposing runoff washes away, therefore can be used as the soil anti-scouribility index.
The Shear Strength Index of soil comprises two of angle of internal friction and cohesions, and index need be determined by testing with special instrument.Direct shearing experiment, triaxial shear test, repeated direct shear test and unconfined compression strength test method that the shear strength of indoor measurement soil is commonly used.Outdoor then have methods such as vane shear test.Direct shearing experiment, triaxial shear test, repeated direct shear test and unconfined compression strength test method, it is the method for geotechnological measuring, often at be more solid soil, all need sampling in the open air, its less than one is to shear the ambient condition that sample has changed the tested soil body, the 2nd, topsoil often can not be got the shearing sample because how loose it is, becomes normality so can't measure.
Summary of the invention
Technical problem to be solved by this invention is to propose a kind of original position, original state, consideration along sloping shear direction, and soil shear face position is used for the method for in-site detecting topsoil shear strength.
A kind of method of testing soil shear strength of slope in situ may further comprise the steps: A1, on soil original position original state domatic, insert shearing ring in the soil to be determined; A2 is with its direction of fall soil stripping; A4 evenly applies water (flow) direction tractive force to shearing ring, detects angular displacement; A3, the maximum value that obtains horizontal direction tractive force is analyzed in the variation of tractive force before and after record is subjected to displacement, and the unit conversion by power and soil shear strength concerns, obtains different depth, the different gradient soil shear strength value along water (flow) direction.
Described method, described shearing ring are inserted the degree of depth of soil to be determined and are determined by the soil layer of need mensuration.
Described method, described shearing ring is the rectangle rigid structures, sword is arranged at the bottom.
Described method, described shearing ring area is about about 200cm2.
Described method, stripping depth is consistent with soil shear face to be measured, and length is 2 times of shearing ring length, and width is 1.5 times of shearing ring width.
This method compared with prior art has following beneficial effect:
What 1, measure is domatic undisturbed soil;
2, do not exist because the problem that loosing soil can't be taken a sample;
3, can measure top layer or different depth of soil shear strength (controlling) by the degree of depth that shearing ring inserts in the soil;
4, directionality (along corroding current application of force direction) is arranged.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
On soil original position original state domatic, shearing ring is inserted in the soil to be determined, the soil layer that the degree of depth is measured according to need is decided;
Above-mentioned shearing ring is the rectangle rigid structures, and sword is arranged at the bottom, is convenient to insert in the soil to be measured;
Above-mentioned shearing ring area is about 200cm
2About, can effectively reduce because the too small inhomogeneities error that causes of area;
With shearing ring direction of fall soil stripping, stripping depth is consistent with soil shear face to be measured then, and length is 2 times of shearing ring length, and about 30cm, width are 1.5 times of shearing ring width, about 30cm.
Shearing ring is evenly applied water (flow) direction tractive force, carry out Angular Displacement Detecting by universal incremental encoder; Automatically the variation of tractive force before and after record is subjected to displacement with single-chip microcomputer analyzes the maximum value of horizontal direction tractive force automatically, and the unit conversion by power and soil shear strength concerns, obtains different depth, the different gradient soil shear strength value along water (flow) direction.
Adopt this method can the scene finish the in-situ test data, the time mensuration process such as real record data, field assay data, simultaneously the conventional method with laboratory experiment has following advantage by comparison: (1) in-site detecting, need not take a sample, test at the scene and need not take a sample; (2) natural structure and the ambient condition, little of the soil body have been kept preferably to soil disturbance; (3) directionality is arranged; (4) applied widely, at the bottom of the site requirements; (5) data accurately and reliably.
Current act on washed off soil along line of slope, and the present invention proposes a kind of original position, original state, consideration along sloping shear direction, and soil shear face position is used for the method for the in-site detecting topsoil shear strength in soil erosion field.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (5)
1. the method for a testing soil shear strength of slope in situ is characterized in that, may further comprise the steps: A1, on soil original position original state domatic, insert shearing ring in the soil to be determined; A2 is with its direction of fall soil stripping; A3 evenly applies along sloping direction tractive force shearing ring, detects angular displacement; A4, the maximum value that obtains along sloping direction tractive force is analyzed in the variation of tractive force before and after record is subjected to displacement, and the unit conversion by power and soil shear strength concerns, obtains different depth, the different gradient soil shear strength value along water (flow) direction.
2. method according to claim 1 is characterized in that, described shearing ring inserts the degree of depth of soil to be determined and determined by the soil layer of need mensuration.
3. method according to claim 1 is characterized in that described shearing ring is the rectangle rigid structures, and sword is arranged at the bottom.
4. method according to claim 1 is characterized in that, described shearing ring area is about 200cm
2About.
5. method according to claim 3 is characterized in that, the stripping depth in the described steps A 2 is consistent with soil shear face to be measured, and length is 2 times of shearing ring length, and width is 1.5 times of shearing ring width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101838107A CN101876169B (en) | 2010-05-26 | 2010-05-26 | Method for testing soil shear strength of slope in situ |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101838107A CN101876169B (en) | 2010-05-26 | 2010-05-26 | Method for testing soil shear strength of slope in situ |
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| Publication Number | Publication Date |
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| CN101876169A CN101876169A (en) | 2010-11-03 |
| CN101876169B true CN101876169B (en) | 2011-11-16 |
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| CN2010101838107A Expired - Fee Related CN101876169B (en) | 2010-05-26 | 2010-05-26 | Method for testing soil shear strength of slope in situ |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106644755A (en) * | 2016-11-01 | 2017-05-10 | 河海大学 | In-situ test device and method for contact surface strength of reinforced soil plant cushion |
| CN106702997A (en) * | 2017-03-16 | 2017-05-24 | 中铁西北科学研究院有限公司 | Method of testing deadweight collapse settlement of soil layers at different depths of loess |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6046213B2 (en) * | 1982-09-20 | 1985-10-15 | 鉄建建設株式会社 | Stable construction method for ground with steep slopes or existing embankments |
| JP2811038B2 (en) * | 1993-07-30 | 1998-10-15 | 財団法人鉄道総合技術研究所 | Large-diameter bending tensile reinforcement and its construction method |
| CN1267718C (en) * | 2004-10-18 | 2006-08-02 | 中国科学院地质与地球物理研究所 | Central direct shear apparatus of triaxiality ring pressure |
| CN2762106Y (en) * | 2004-12-15 | 2006-03-01 | 中国科学院武汉岩土力学研究所 | Strain control type large indoor and on-situ dual-purpose straight shear device |
| CN2811984Y (en) * | 2005-07-19 | 2006-08-30 | 中国科学院武汉岩土力学研究所 | Reverse pressing type in-situ direct shear apparatus with double shear boxes |
| CN101105433B (en) * | 2007-07-26 | 2011-01-12 | 河海大学 | Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method |
| CN201145658Y (en) * | 2007-07-26 | 2008-11-05 | 河海大学 | Portable on site and indoor dual-purpose direct shear test instrument |
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Granted publication date: 20111116 Termination date: 20120526 |