CN103233453B - A kind of original position soil body surveying method - Google Patents
A kind of original position soil body surveying method Download PDFInfo
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- CN103233453B CN103233453B CN201310135806.7A CN201310135806A CN103233453B CN 103233453 B CN103233453 B CN 103233453B CN 201310135806 A CN201310135806 A CN 201310135806A CN 103233453 B CN103233453 B CN 103233453B
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Abstract
The invention discloses a kind of original position soil body prospecting device and surveying method, prospecting device comprises the hollow rod that bottom is installed with cone gauge head, hollow rod and cone gauge head sidewall are all provided with earth pressure gauge and pore pressure gauge, the bottom tip of cone gauge head offers intake-outlet, and intake-outlet is sealedly connected with the water route pipeline passing hollow rod top; Surveying method first will reconnoitre device press-in and pick-up transducers data by certain speed; Then open water pump, sink to reconnoitring device, again pick-up transducers data by same speed; Finally provide the penetration resistance that deadweight is sunk and suction sinks respectively.Prospecting device of the present invention and surveying method simulate the perturbation process in suction type foundation sinking watching suffered by the soil body, consider suction type foundation sinking construction technique to the impact of soil strength, measuredly can reflect the penetration resistance of suction type foundation under special construction technique more accurately to soil body end resistance and side form resistance.
Description
Technical field
The present invention relates to a kind of site survey techniques of foundation soil, specifically, relate to a kind of can original position exploration Soil Parameters method.
Background technology
Soil body prospecting is steps necessary before works basic engineering, can based on design necessary soil parameter is provided, the accuracy of soil body prospecting directly has influence on the degree of safety on works basis.
At present in ocean engineering, soil body surveying method mainly comprises the methods such as core sample method, four-bladed vane method and CPT static sounding.The soil sample that core sample method obtains generally will carry out the determination of Soil Parameters in soil mechanics laboratory, used soil body constraints and the actual forced status of the on-the-spot soil body often have bigger difference.Although four-bladed vane method and CPT method are site inspection methods, survey tools used and method and practical structures thing immerge are constructed very not identical with the stressing conditions of using state, and the parameter obtained need be obtained by empirical coefficient conversion toward contact.
In sum, the exploring equipment that existing soil body investigation method uses and the investigation method foundation pattern difference usually and in ocean engineering is comparatively far away, often occurs the accurate not problem of exploration result.Particularly work as suction type foundation, such as, after bucket foundation, box-type suction foundation, suction anchor etc. occur, its special construction method by suction sinking can produce certain influence to basic surrounding soil.Suction type foundation work progress generally includes deadweight and to sink and suction sinks two processes, and it is rely on construction weight to sink certain degree of depth and reach the process of gravity and resistance balance that deadweight is sunk, and is formed and the airtight condition of the soil body simultaneously; Then take out water/gas by equipment such as submersible pumps and carry out suction sinking, make basis inside and outside generation pressure differential overcome penetration resistance continuation sinking and put in place.
Take out by basic internal the basic external and internal pressure difference that water/gas causes due to suction type foundation to sink, therefore basic surrounding soil can produce percolation phenomenon under suction, destroy soil body original state structure, and after sinking to terminating, the soil body can produce remodelling phenomenon again.If do not consider effect of constructing, the investigation method for undisturbed soil is directly utilized to instruct suction type foundation design will occur comparatively big error.
Summary of the invention
The present invention is to solve when the soil body investigation method in existing ocean engineering is applied to suction type foundation, the accurate not technical problem of exploration result, provides a kind of original position soil body surveying method.
In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:
A kind of original position soil body surveying method, the prospecting device that the method utilizes comprises the hollow rod of top closure, the bottom of described hollow rod is installed with the cone gauge head of hollow-core construction, described hollow rod and described cone gauge head sidewall are all provided with the earth pressure gauge of radial equipartition and the pore pressure gauge of radial equipartition, described earth pressure gauge and described pore pressure gauge aligned and spacing is equal from top to bottom respectively; The bottom tip of described cone gauge head offers intake-outlet, and described intake-outlet is sealedly connected with the water route pipeline passing described hollow rod top, and described water route pipeline is connected with described hollow rod top seal;
Comprise the steps:
(1) sunk by described prospecting device by the speed of 0.01mm/s ~ 10mm/s, simultaneously described earth pressure gauge gathers the first soil pressure data, described pore pressure gauge gathers the first water pressure data;
According to described first soil pressure data and described first water pressure data, determine the end resistance recommended value q of basis deadweight sinking watching according to geotechnical investigation code
1with side form resistance recommended value f
1, draw deadweight penetration resistance Qd
1=f
1as
1+ q
1ap, wherein As
1bury lateral area on basis for sinking watching of conducting oneself with dignity, bottom end area based on Ap;
(2) water pump is opened, current are made to flow out along described intake-outlet or suck, by the speed of 0.01mm/s ~ 10mm/s, described prospecting device is sunk, utilize that described earth pressure gauge gathers the second soil pressure data, described pore pressure gauge gathers the second water pressure data, the pressure of described water pump is set to the hydraulic pressure identical with basic suction sinking construction process;
According to described second soil pressure data and described second water pressure data, determine the end resistance recommended value q of basic suction sinking watching according to geotechnical investigation code
2with side form resistance recommended value f
2, suction penetration resistance Qd
2=f
2as
2+ q
2ap, wherein As
2bury lateral area on basis for suction sinking watching, bottom end area based on Ap.
The degree of depth that in step (1), prospecting device sinks is at least the height of foundation of a times.
The degree of depth that in step (2), prospecting device sinks is at least the height of foundation of two times.
Water-aspirator pressure in step (2) is-10m ~ 10m head.
The length of described hollow rod is 10m ~ 60m, external diameter is 10cm ~ 30cm.
Every at least four described earth pressure gauges and the sustained height radial equipartition of every at least four described pore pressure gauges at hollow rod, and the described earth pressure gauge of sustained height and described pore pressure gauge interval are arranged.
The distance between the upper and lower of the described earth pressure gauge on described hollow rod and the distance between the upper and lower of described pore water pressure are 0.5m ~ 1m.
The distance between the upper and lower of the described earth pressure gauge on described cone gauge head and the distance between the upper and lower of described pore water pressure are 5cm ~ 10cm.
The diameter of described intake-outlet is 1 ~ 10mm.
Described intake-outlet is provided with reinforced geotextile.
The invention has the beneficial effects as follows:
Surveying method of the present invention simulates the perturbation process in suction type foundation sinking watching suffered by the soil body, consider suction type foundation sinking construction technique to the impact of soil strength, measuredly can reflect the penetration resistance of suction type foundation under special construction technique more accurately to soil body end resistance and side form resistance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the original position soil body provided by the present invention prospecting device;
Fig. 2 is the A-A sectional view of Fig. 1.
In figure: 1, hollow rod; 2, cone gauge head; 3, earth pressure gauge; 4, pore pressure gauge; 5, intake-outlet; 6, water route pipeline.
Detailed description of the invention
For summary of the invention of the present invention, feature and effect can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
As shown in Figure 1 to Figure 2, this embodiment discloses herein a kind of original position soil body prospecting device, form primarily of hollow rod 1, cone gauge head 2, earth pressure gauge 3, pore pressure gauge 4 and water route pipeline 6.
Hollow rod 1 is the Hollow circular beam of top closure, and under normal circumstances, its length is 10m ~ 60m, and external diameter is 10cm ~ 30cm.When depth of investigation exceedes the length of single hollow rod 1, lengthen by other hollow rod 1 of continued access.
Hollow rod 1 sidewall is provided with multiple earth pressure gauge 3 and pore pressure gauge 4, every four earth pressure gauges 3 and every four pore pressure gauges 4 are at the sustained height radial equipartition of hollow rod 1, and the earth pressure gauge 3 of sustained height and pore pressure gauge 4 interval are arranged.Earth pressure gauge 3 aligned from top to bottom; Pore pressure gauge 4 aligned from top to bottom, and the spacing of neighbouring two earth pressure gauges 3 and neighbouring two pore pressure gauges 4 is equal, and spacing is 0.5m ~ 1m.
Cone gauge head 2 is similarly hollow-core construction, and its cone tip is down installed on hollow rod 1 lower port, can be fixedly connected with by thread or bolt with hollow rod 1.Cone gauge head 2 sidewall is also provided with earth pressure gauge 3 and pore pressure gauge 4 radial equipartition, earth pressure gauge 3 on it and pore pressure gauge 4 respectively with the earth pressure gauge 3 on hollow rod 1 and pore pressure gauge 4 alignment, and neighbouring two earth pressure gauges 3 on cone gauge head 2 are equal with the spacing of neighbouring two pore pressure gauges 4, spacing is 5cm.
The tip of cone gauge head 2 offers intake-outlet 5, intake-outlet 5 typically have a diameter from 1 ~ 10mm.Intake-outlet 5 has been bolted reinforced geotextile, enters into cone gauge head 2 and hollow rod 1 inner chamber for preventing the soil body.Intake-outlet 5 and water route pipeline 6 are tightly connected, and water route pipeline 6 is extended to hollow rod 1 top by intake-outlet 5 along cone gauge head 2 and hollow rod 1 and passes, and is connected with water pump; Water route pipeline 6 and hollow rod 1 top are also tightly connected.
Utilize the original position soil body surveying method of above-mentioned prospecting device, concrete steps are as follows:
(1) first time prospecting: by the speed of 0.01mm/s ~ 10mm/s, utilizes hydraulic loaded equipment by this prospecting device press-in sea bed, while earth pressure gauge 3 gathers the first soil pressure data, pore pressure gauge 4 gathers the first water pressure data.The prospecting depth of prospecting device press-in is at least the height of foundation of a times, and prospecting depth refers to the distance on prospecting device cone gauge head bottom to sea bed surface.
According to the first soil pressure data and the first water pressure data, according to the computational methods of existing geotechnical investigation code (as China's ocean engineering or Norske Veritas are correlated with soil test and basic norm), the end resistance recommended value q of basis deadweight sinking watching can be determined
1with side form resistance recommended value f
1, thus draw the deadweight penetration resistance Qd on basis
1=f
1as
1+ q
1ap, wherein As
1bury lateral area on basis for sinking watching of conducting oneself with dignity, bottom end area based on Ap.
(2) second time prospecting: open water pump, current flow out along the intake-outlet 5 of cone gauge head 2 bottom or suck, this prospecting device sinks by the speed of still pressing 0.01mm/s ~ 10mm/s again, utilizes that earth pressure gauge 3 gathers the second soil pressure data, pore pressure gauge 4 gathers the second water pressure data again.The prospecting depth reconnoitring device press-in in second time prospecting is at least the height of foundation of two times, and prospecting depth refers to the distance on prospecting device cone gauge head bottom to sea bed surface.
Wherein the pressure of water pump is set to the hydraulic pressure identical with the suction sinking construction process of suction type foundation, and this pressure is generally-10m ~ 10m head.
According to the second soil pressure data and the second water pressure data, according to the computational methods of existing geotechnical investigation code (as China's ocean engineering or Norske Veritas are correlated with soil test and basic norm), the end resistance recommended value q of basic suction sinking watching can be determined
2with side form resistance recommended value f
2, thus draw the suction penetration resistance Qd on basis
2=f
2as
2+ q
2ap, wherein As
2bury lateral area on basis for suction sinking watching, bottom end area based on Ap.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make the concrete conversion of a lot of form, these all belong within protection scope of the present invention.
Claims (10)
1. an original position soil body surveying method, the prospecting device that the method utilizes comprises the hollow rod of top closure, the bottom of described hollow rod is installed with the cone gauge head of hollow-core construction, described hollow rod and described cone gauge head sidewall are all provided with the earth pressure gauge of radial equipartition and the pore pressure gauge of radial equipartition, described earth pressure gauge and described pore pressure gauge aligned and spacing is equal from top to bottom respectively; The bottom tip of described cone gauge head offers intake-outlet, and described intake-outlet is sealedly connected with the water route pipeline passing described hollow rod top, and described water route pipeline is connected with described hollow rod top seal;
It is characterized in that, comprise the steps:
(1) sunk by described prospecting device by the speed of 0.01mm/s ~ 10mm/s, simultaneously described earth pressure gauge gathers the first soil pressure data, described pore pressure gauge gathers the first water pressure data;
According to described first soil pressure data and described first water pressure data, determine the end resistance recommended value q of basis deadweight sinking watching according to geotechnical investigation code
1with side form resistance recommended value f
1, draw deadweight penetration resistance Qd
1=f
1as
1+ q
1ap, wherein As
1bury lateral area on basis for sinking watching of conducting oneself with dignity, bottom end area based on Ap;
(2) water pump is opened, current are made to flow out along described intake-outlet or suck, by the speed of 0.01mm/s ~ 10mm/s, described prospecting device is sunk, utilize that described earth pressure gauge gathers the second soil pressure data, described pore pressure gauge gathers the second water pressure data, the pressure of described water pump is set to the hydraulic pressure identical with basic suction sinking construction process;
According to described second soil pressure data and described second water pressure data, determine the end resistance recommended value q of basic suction sinking watching according to geotechnical investigation code
2with side form resistance recommended value f
2, suction penetration resistance Qd
2=f
2as
2+ q
2ap, wherein As
2bury lateral area on basis for suction sinking watching, bottom end area based on Ap.
2. a kind of original position soil body surveying method according to claim 1, is characterized in that, the degree of depth that in step (1), prospecting device sinks is at least the height of foundation of a times.
3. a kind of original position soil body surveying method according to claim 1, is characterized in that, the degree of depth that in step (2), prospecting device sinks is at least the height of foundation of two times.
4. a kind of original position soil body surveying method according to claim 1, is characterized in that, the water-aspirator pressure in step (2) is-10m ~ 10m head.
5. a kind of original position soil body surveying method according to claim 1, is characterized in that, the length of described hollow rod is 10m ~ 60m, external diameter is 10cm ~ 30cm.
6. a kind of original position soil body surveying method according to claim 1, it is characterized in that, every at least four described earth pressure gauges and the sustained height radial equipartition of every at least four described pore pressure gauges at hollow rod, and the described earth pressure gauge of sustained height and described pore pressure gauge interval are arranged.
7. a kind of original position soil body surveying method according to claim 1, is characterized in that, the distance between the upper and lower of the described earth pressure gauge on described hollow rod and the distance between the upper and lower of described pore water pressure are 0.5m ~ 1m.
8. a kind of original position soil body surveying method according to claim 1, is characterized in that, the distance between the upper and lower of the described earth pressure gauge on described cone gauge head and the distance between the upper and lower of described pore water pressure are 5cm ~ 10cm.
9. a kind of original position soil body surveying method according to claim 1, is characterized in that, the diameter of described intake-outlet is 1 ~ 10mm.
10. a kind of original position soil body surveying method according to claim 1, it is characterized in that, described intake-outlet is provided with reinforced geotextile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310135806.7A CN103233453B (en) | 2013-04-18 | 2013-04-18 | A kind of original position soil body surveying method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310135806.7A CN103233453B (en) | 2013-04-18 | 2013-04-18 | A kind of original position soil body surveying method |
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| CN103233453A CN103233453A (en) | 2013-08-07 |
| CN103233453B true CN103233453B (en) | 2015-08-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107871026A (en) * | 2016-09-26 | 2018-04-03 | 天津大学 | One kind bucket foundation malleation sinking drag computation method suitable for sand |
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|---|---|---|---|---|
| CN105200971B (en) * | 2015-10-22 | 2017-01-18 | 青岛理工大学 | Device and method for testing pile-soil interface soil pressure and pore water pressure |
| CN105258824B (en) * | 2015-11-05 | 2018-04-13 | 白云 | A kind of shield tunnel Water And Earth Pressures monitoring rod |
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| CN109030774A (en) * | 2018-06-28 | 2018-12-18 | 贵州大学 | A kind of fishery lake soil reconnoitres detection device |
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| CN107871026B (en) * | 2016-09-26 | 2019-11-15 | 天津大学 | One kind bucket foundation positive pressure sinking drag computation method suitable for sand |
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| CN103233453A (en) | 2013-08-07 |
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