CN105372701A - Method for detecting soil liquefaction degree of port by using seismic waves - Google Patents
Method for detecting soil liquefaction degree of port by using seismic waves Download PDFInfo
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- CN105372701A CN105372701A CN201510918325.2A CN201510918325A CN105372701A CN 105372701 A CN105372701 A CN 105372701A CN 201510918325 A CN201510918325 A CN 201510918325A CN 105372701 A CN105372701 A CN 105372701A
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- 239000002689 soil Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000001228 spectrum Methods 0.000 claims abstract description 13
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 238000010205 computational analysis Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000010183 spectrum analysis Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000011148 porous material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for detecting the soil liquefaction degree of a port by using seismic waves. The method comprises the following steps that: a seismic wave mechanical source and a seismic wave receiver are distributed in an area to be detected of the port; clutter in vibration information can be filtered out; seismic wave spectrum strength and seismic wave longitudinal wave velocity can be obtained through calculation and analysis; basic data are inputted to a data processing device; the soil density of the area to be detected, seismic wave spectrum intensity and the dynamic shear stress ratio of the area to be detected can be calculated according to the seismic wave longitudinal wave velocity, and liquefaction resistance rate is calculated, and a calculation formula of the liquefaction resistance rate is described in the descriptions of the invention, and therefore, the liquefaction degree of the area to be detected can be judged. With the method for detecting the soil liquefaction degree of the port by using the seismic waves of the invention adopted, the soil liquefaction degree of the area to be detected of the port can be obtained fast and conveniently.
Description
Technical field
The present invention relates to a kind of geological exploration method.More particularly, the present invention relates to a kind of method utilizing seismic event to detect port area soil property Degree of Liquefaction.
Background technology
Along with the continuous expansion of market abroad, port engineering construction area worldwide progressively expands.For the port structure being positioned at distribution of strong earthquakes band, the research of its seismic design progressively becomes the Focal point and difficult point in port engineering design aspect.In run in early stage is in the past implemented, seismic design is the important bottleneck of domestic design unit going global.For an overseas port engineering project, often need the seismic fortification criterion and the specification that relate to the every countries such as the U.S., Europe and engineering location or area, carry out the aseismic analysis of engineering structure by referring to all standard criterion.In addition, when carrying out seismic design, except meeting designing requirement that specification specifies, the on-site background of the side's of design incorporation engineering, construction requirement and earthquake history etc. are needed to adopt more detailed and complicated Seismic Design Method toward contact, when saturated loose sand (comprising some silt) is subject to vibrating, if pore water has little time to discharge, pore water pressure constantly increases, and effective stress reduces gradually.When effective stress is reduced to zero, the state that the soil body can produce sharply changes, and becomes liquid the same, completely loses shearing strength and load-bearing capacity, cause ground and building destruction, the liquefaction phenomenon that Here it is often says.Liquefaction can occur at any position in saturated sand layers, can on ground, also can at a certain depth of subsurface, depend on state and the Vibration Condition of sand, the layer of sand did not sometimes liquefy originally, but because layer of sand liquefies below, hydrostatic excess pressure dissipates with the upwards flowing of water, if at this moment hydraulic gradient is excessive, upward water flow may make the seepage erosion of layer of sand generation above and unstability, even if or do not reach unstability, but the load-bearing capacity of soil layer above also can be made to decline.The construction of anti-Degree of Liquefaction to harbour of harbour soil property plays vital reference role.
Summary of the invention
An object of the present invention is to solve at least the problems referred to above, and the advantage will illustrated at least is below provided.
A further object of the invention is to provide a kind of method utilizing seismic event to detect port area soil property Degree of Liquefaction, and it can be quick, knows region to be measured, harbour soil property Degree of Liquefaction easily.
In order to realize according to these objects of the present invention and other advantage, provide a kind of method utilizing seismic event to detect port area soil property Degree of Liquefaction, it comprises the following steps:
Step one, lays seismic event mechanical source and seismic receiver in region to be measured, harbour, and on described seismic receiver access data harvester and data processing equipment;
Step 2, described data collector gathers the ground of seismic receiver collection and the vibration information of underground, the clutter in vibration information described in described data processing equipment filtering, and computational analysis obtains seismic event wave spectrum intensity and seismic event longitudinal wave velocity;
Step 3, inputs described data processing equipment by basic data; Described basic data comprises: focal point location expression, soil property sampling description, stacking fold, seismic wave frequency spectrum analysis, wave field separation, one or more in rock & soil mechanical parameter;
Step 4, utilize seismic event longitudinal wave velocity to calculate region to be measured soil property density, formula is as follows:
wherein VP is longitudinal wave velocity, and K is Lame's constant, and ∧ is shearing elasticity modulus;
Utilize seimic wave velocity spectral intensity value to calculate seismic wave reaction spectral intensity, computing formula is as follows:
wherein, Sv is velocity spectrum intensity level, and T is the cycle;
Calculate the cyclic shear stress ratio in region to be measured, computing formula is as follows:
Wherein,
α＝｛0.0052(α
max/SI)-0.0163｝10
-2
b＝｛0.091O(α
max/SI)+O.0787｝10
-2
Step 5, calculate liquefaction opposing rate, its computing formula is as follows:
Wherein, C
wfor ground motion characteristic correction factor; R
lfor triaxial strength ratio, N is the N value that standard penetration test (SPT) measures; σ
vfor whole top pressure; σ
v' be the effective pressure in top; The degree of depth of X distance ground surface; Thus the Degree of Liquefaction in region to be measured can be judged.
Preferably, described seismic event mechanical source is mechanical type impact origin or fluid pressure type impact origin.
Preferably, in described step one, lay multiple seismic receiver successively in region to be detected after, lay a mechanical source again; Distance between seismic receiver is not more than 1/4 of the seismic event wavelength that described mechanical source produces.
Preferably, described seismic receiver comprises for being embedded in underground and ground detection differently three-component seismometer string and hemisphere seismic receiver in the unidirectional string of seismic wave, land three-component seismometer string, hole.
Preferably, described data processing equipment utilizes the data of seismic receiver described in the process of SIMQKE_GR software, obtains seismic wave reaction spectrum file and saves as .srf formatted file.
Preferably, described multiple seismic receiver is that vertical direction connects bunchiness, and the string of described seismic receiver composition, circumferentially distributes for the center of circle with described seismic event mechanical source.
Preferably, the clutter in vibration information described in described filtering specifically refers to ground roll, direct wave, side echo, shear wave and scattering wave.
Preferably, the degree of depth of unidirectional wave detector embedding described in described seismic receiver in underground is 20-30m.
The present invention at least comprises following beneficial effect: method placement of mechanical focus and the seismic receiver in region to be measured, harbour utilizing seismic event to detect port area soil property Degree of Liquefaction of the present invention, corresponding reflection wave can be obtained quickly and easily, after utilizing SIMQKE_GR software to carry out processing the related data about reflection wave, the data such as more accurate seismic wave reaction spectrum can be obtained, for calculating below provides foundation.Applicant utilizes the correlation formula in step 5 of the present invention the anti-liquefied fraction calculating region to be measured, harbour or even pore water pressure ratio etc. and the harbour soil property of simple and fast more to liquefy relevant parameter, thus judge harbour soil property Degree of Liquefaction quickly and easily according to correlation parameter, for port area antidetonation construction provides foundation.
Part is embodied by explanation below by other advantage of the present invention, target and feature, part also will by research and practice of the present invention by those skilled in the art is understood.
Accompanying drawing explanation
The distribution schematic diagram that Fig. 1 is mechanical source described in the method utilizing seismic event to detect port area soil property Degree of Liquefaction of the present invention and seismic receiver;
Fig. 2 is the schematic diagram of seismic wave reaction spectrum described in the method utilizing seismic event to detect port area soil property Degree of Liquefaction of the present invention;
Fig. 3 is the curve map of different monitoring points cyclic shear stress ratio described in the method utilizing seismic event to detect port area soil property Degree of Liquefaction of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to instructions word to make those skilled in the art.
Should be appreciated that used hereinly such as " to have ", other element one or more do not allotted in " comprising " and " comprising " term or the existence of its combination or interpolation.
As shown in Fig. 1 and 2 and 3, the invention provides the method utilizing seismic event to detect port area soil property Degree of Liquefaction, it comprises the following steps:
Step one, lays seismic event mechanical source 1 and seismic receiver 2 in region to be measured, harbour, and on described seismic receiver 2 access data harvester and data processing equipment;
Step 2, described data collector gathers the ground of seismic receiver 2 collection and the vibration information of underground, the clutter in vibration information described in described data processing equipment filtering, and computational analysis obtains seismic event wave spectrum intensity and seismic event longitudinal wave velocity;
Step 3, inputs described data processing equipment by basic data; Described basic data comprises: focal point location expression, soil property sampling description, stacking fold, seismic wave frequency spectrum analysis, wave field separation, one or more in rock & soil mechanical parameter; Such as, after utilizing SIMQKE_GR software process process related data, the seismic wave reaction produced as shown in Figure 2 is set a song to music line chart.
Step 4, utilize seismic event longitudinal wave velocity to calculate region to be measured soil property density, formula is as follows:
wherein VP is longitudinal wave velocity, and K is Lame's constant, and ∧ is shearing elasticity modulus;
Utilize seimic wave velocity spectral intensity value to calculate seismic wave reaction spectral intensity, computing formula is as follows:
wherein, Sv is velocity spectrum intensity level, and T is the cycle;
Calculate the cyclic shear stress ratio in region to be measured, computing formula is as follows:
Wherein,
α＝｛0.0052(α
max/SI)-0.0163｝10
-2
b＝｛0.0910(α
max/SI)+0.0787｝10
-2
Step 5, calculate liquefaction opposing rate, its computing formula is as follows:
Wherein, C
wfor ground motion characteristic correction factor; R
lfor triaxial strength ratio, N is the N value that standard penetration test (SPT) measures; σ
vfor whole top pressure; σ
v' be the effective pressure in top; The degree of depth of X distance ground surface; Thus the Degree of Liquefaction in region to be measured can be judged.As shown in Figure 3, also there is very big difference in its cyclic shear stress ratio of monitoring point that the cyclic shear stress ratio in region to be measured is different.The harbour difference of identical soil property granularity or soil property density, its anti-Degree of Liquefaction is also different greatly, so, need to calculate the parameter values such as anti-Degree of Liquefaction further and carry out more accurately to react harbour soil property situation, for port construction provides abundanter foundation.
Wherein in an embodiment, as shown in Figure 1, described seismic event mechanical source 1 is mechanical type impact origin or fluid pressure type impact origin.
Wherein in an embodiment, as shown in Figure 1, in described step one, lay multiple seismic receiver 2 successively in region to be detected after, lay a mechanical source 1 again; Distance between seismic receiver 2 is not more than 1/4 of the seismic event wavelength that described mechanical source 1 produces.
Wherein in an embodiment, as shown in Figure 1, described seismic receiver 2 comprises for being embedded in underground and ground detection differently three-component seismometer string and hemisphere seismic receiver in the unidirectional string of seismic wave, land three-component seismometer string, hole.
Wherein in an embodiment, as shown in Figure 1, described data processing equipment utilizes the data of seismic receiver described in the process of SIMQKE_GR software, obtains seismic wave reaction spectrum file and saves as .srf formatted file.
Wherein in an embodiment, as shown in Figure 1, described multiple seismic receiver 2 connects bunchiness in vertical direction, and the string of described seismic receiver composition, circumferentially distributes for the center of circle with described seismic event mechanical source 1.
Wherein in an embodiment, the clutter in vibration information described in described filtering specifically refers to ground roll, direct wave, side echo, shear wave and scattering wave.
Wherein in an embodiment, as shown in Figure 1, described in described seismic receiver 2, the degree of depth of unidirectional wave detector embedding in underground is 20-30m.
Although embodiment of the present invention are open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (8)
1. utilize seismic event to detect a method for port area soil property Degree of Liquefaction, it is characterized in that, comprise the following steps:
Step one, lays seismic event mechanical source and seismic receiver in region to be measured, harbour, and on described seismic receiver access data harvester and data processing equipment;
Step 2, described data collector gathers the ground of seismic receiver collection and the vibration information of underground, the clutter in vibration information described in described data processing equipment filtering, and computational analysis obtains seismic event wave spectrum intensity and seismic event longitudinal wave velocity;
Step 3, inputs described data processing equipment by basic data; Described basic data comprises: focal point location expression, soil property sampling description, stacking fold, seismic wave frequency spectrum analysis, wave field separation, one or more in rock & soil mechanical parameter;
Step 4, utilize seismic event longitudinal wave velocity to calculate region to be measured soil property density, formula is as follows:
wherein V
pfor longitudinal wave velocity, K is Lame's constant, and ∧ is shearing elasticity modulus;
Utilize seimic wave velocity spectral intensity value to calculate seismic wave reaction spectral intensity, computing formula is as follows:
wherein, Sv is velocity spectrum intensity level, and T is the cycle;
Calculate the cyclic shear stress ratio in region to be measured, computing formula is as follows:
L＝(b-ax)SIσ
v/σ′
v(II)
Wherein,
a＝{0.0052(α
max/SI)-0.0163}10
-2
b＝{0.0910(α
max/SI)+0.0787}10
-2
Step 5, calculate liquefaction opposing rate, its computing formula is as follows:
Wherein, C
wfor ground motion characteristic correction factor; R
lfor triaxial strength ratio, N is the N value that standard penetration test (SPT) measures; σ
vfor whole top pressure; σ
v 'for the effective pressure in top; The degree of depth of X distance ground surface; Thus the Degree of Liquefaction in region to be measured can be judged.
2. utilize seismic event to detect the method for port area soil property Degree of Liquefaction as claimed in claim 1, it is characterized in that, described seismic event mechanical source is mechanical type impact origin or fluid pressure type impact origin.
3. utilize seismic event to detect the method for port area soil property Degree of Liquefaction as claimed in claim 2, it is characterized in that, in described step one, lay multiple seismic receiver successively in region to be detected after, lay a mechanical source again; Distance between seismic receiver is not more than 1/4 of the seismic event wavelength that described mechanical source produces.
4. utilize seismic event to detect the method for port area soil property Degree of Liquefaction as claimed in claim 1, it is characterized in that, described seismic receiver comprises for being embedded in underground and ground detection differently three-component seismometer string and hemisphere seismic receiver in the unidirectional string of seismic wave, land three-component seismometer string, hole.
5. utilize seismic event to detect the method for port area soil property Degree of Liquefaction as claimed in claim 1, it is characterized in that, described data processing equipment utilizes the data of seismic receiver described in the process of SIMQKE_GR software, obtains seismic wave reaction spectrum file and saves as .srf formatted file.
6. utilize seismic event to detect the method for port area soil property Degree of Liquefaction as claimed in claim 4, it is characterized in that, described multiple seismic receiver is that vertical direction connects bunchiness, and the string of described seismic receiver composition, circumferentially distributes for the center of circle with described seismic event mechanical source.
7. utilize seismic event to detect the method for port area soil property Degree of Liquefaction as claimed in claim 1, it is characterized in that, the clutter in vibration information described in described filtering specifically refers to ground roll, direct wave, side echo, shear wave and scattering wave.
8. utilize seismic event to detect the method for port area soil property Degree of Liquefaction as claimed in claim 1, it is characterized in that, the degree of depth of unidirectional wave detector embedding described in described seismic receiver in underground is 20-30m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324682A (en) * | 2016-09-19 | 2017-01-11 | 中国石油化工股份有限公司 | Surface structure investigation method applied to permafrost regions |
| CN106768847A (en) * | 2017-02-14 | 2017-05-31 | 华侨大学 | The analogy method and device of a kind of Potential of Seabed Under Wave Loading liquefaction water-jet depth |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6308135B1 (en) * | 1999-10-07 | 2001-10-23 | Golder Sierra Llc | Soil liquefaction prevention by electro-osmosis during an earthquake event |
| CN104989411A (en) * | 2015-06-16 | 2015-10-21 | 河海大学 | Liquefaction discriminating device and method of pipe piece surrounding saturated sand caused by shield construction |
-
2015
- 2015-12-10 CN CN201510918325.2A patent/CN105372701B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6308135B1 (en) * | 1999-10-07 | 2001-10-23 | Golder Sierra Llc | Soil liquefaction prevention by electro-osmosis during an earthquake event |
| CN104989411A (en) * | 2015-06-16 | 2015-10-21 | 河海大学 | Liquefaction discriminating device and method of pipe piece surrounding saturated sand caused by shield construction |
Non-Patent Citations (3)
| Title |
|---|
| YOUD T L: "Liquefaction resistance of soils: summery report from the NCEER and 1998 NCEER/NSF workshops on evaluation of liquefaction resistance of soils", 《JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING》 * |
| 张宗亮: "《200m级以上高心墙堆石坝关键技术研究及工程应用》", 31 December 2011 * |
| 索丽生: "《水工设计手册》", 31 August 1984 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324682A (en) * | 2016-09-19 | 2017-01-11 | 中国石油化工股份有限公司 | Surface structure investigation method applied to permafrost regions |
| CN106324682B (en) * | 2016-09-19 | 2019-02-26 | 中国石油化工股份有限公司 | A kind of surface structure survey method applied to frozen soil layer area |
| CN106768847A (en) * | 2017-02-14 | 2017-05-31 | 华侨大学 | The analogy method and device of a kind of Potential of Seabed Under Wave Loading liquefaction water-jet depth |
| CN106768847B (en) * | 2017-02-14 | 2018-11-27 | 华侨大学 | A kind of analogy method and device of Potential of Seabed Under Wave Loading liquefaction water-jet depth |
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Inventor after: Sun Huifeng Inventor after: Liu Shijing Inventor after: Wang Rong Inventor after: Chen Jian Inventor after: Dong Jie Inventor before: Liu Shijing Inventor before: Wang Rong Inventor before: Chen Jian Inventor before: Dong Jie |
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