CN110988300A - Method for measuring secondary compression coefficient of coral sand based on hydraulic reclamation test - Google Patents
Method for measuring secondary compression coefficient of coral sand based on hydraulic reclamation test Download PDFInfo
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- CN110988300A CN110988300A CN201911146287.8A CN201911146287A CN110988300A CN 110988300 A CN110988300 A CN 110988300A CN 201911146287 A CN201911146287 A CN 201911146287A CN 110988300 A CN110988300 A CN 110988300A
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- 238000012360 testing method Methods 0.000 title claims abstract description 89
- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 28
- 241000243321 Cnidaria Species 0.000 title claims abstract description 28
- 239000004576 sand Substances 0.000 title claims abstract description 28
- 238000007906 compression Methods 0.000 title claims abstract description 26
- 230000006835 compression Effects 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007596 consolidation process Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 21
- 230000035515 penetration Effects 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 6
- 238000011835 investigation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 5
- 238000011282 treatment Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
Abstract
The invention relates to a method for measuring secondary compressibility of coral sand based on a hydraulic fill test, which provides a measuring and calculating method for the secondary compressibility of coral sand at the bottom of hydraulic fill coral sand with nonuniform time and space, different areas of hydraulic fill sea engineering are always hydraulic filled at different times and hydraulic filled at different thicknesses, which causes different consolidation degrees of strata in different areas and larger later settlement difference, the final settlement amount of the hydraulic fill coral sand is difficult to calculate more accurately by adopting theory, the calculation method fully utilizes the site historical conditions and test data, maximally regresses the history, simulates the historical process of completing the self-consolidation settlement of the stratum, comparing the stratum settlement data after the treatments of new and old hydraulic reclamation and unequal thickness, fully analyzing the historical difference of the stratum, and comparing and analyzing the current data difference to obtain the history and the current commonality so as to obtain the secondary compression coefficient which is more in line with the reality.
Description
Technical Field
The invention discloses a method for measuring the secondary compression coefficient of coral sand based on a hydraulic reclamation test, and belongs to the technical field of measurement.
Background
With the development of economy, deeper fill engineering and sea filling engineering are more and more. The filling material is generally made of local materials, and coral sand is used as a sea filling material and is applied to a plurality of projects. Prediction of post-construction settlement in engineering is an important index of concern. Usually the secondary compression set is a major component of the engineering settlement. The secondary compression coefficient is an important index used in the settlement prediction. For the stratum such as coral sand, at present, the method of empirical formula is mostly adopted for determining the secondary compressibility, and the estimated result is greatly different from the actual result.
Disclosure of Invention
The invention provides a coral sand secondary compression coefficient measuring method based on a hydraulic reclamation test aiming at the requirements of the prior art, and aims to determine the secondary compression coefficient by using site historical data and site test data.
The technical scheme of the invention comprises the following steps:
the coral sand secondary compression coefficient measuring method based on the hydraulic reclamation test comprises the following steps:
step one, determining two test areas
Carrying out hydraulic reclamation historical investigation near an engineering site, arranging a test area 1 in an original coral sand area, and requiring that the stratum backfill time of the test area 1 is more than 3 years and the backfill thickness is not less than 5 m; setting another test area 2 in the newly backfilled coral sand area, wherein the backfilling time of the test area 2 is required to be more than 3 months, and the backfilling thickness is not less than 5 m;
step two, leveling field and dynamic penetration test
Leveling the test area 1 and the test area 2 to meet the requirement of a vibrating roller mill capable of walking stably, and then carrying out a heavy cone dynamic penetration test;
step three, vibrating and rolling
Respectively carrying out vibration rolling in the two test areas by adopting vibration rolling equipment, and recording the settlement of the earth surface;
step four, the second dynamic penetration test
And after the vibration rolling is finished, carrying out a second dynamic heavy cone penetration test at a position which is less than 1 m away from the heavy cone dynamic penetration test point in the second step, wherein the test depth is not less than 6 m.
Step five, analyzing data and inverting a secondary compression consolidation coefficient
And calculating by adopting a secondary compression coefficient inversion formula to obtain a secondary compression coefficient according to the secondary dynamic sounding data and the earth surface settlement data of the two test areas.
The two test sites in the step one are not less than 10 meters multiplied by 50 meters.
The number of test points of the heavy cone dynamic penetration test in the step one is not less than 6, and the detection depth is not less than 6 meters.
The vibration rolling equipment with the length not less than 26t is adopted for vibration rolling, the vibration rolling is required to be not less than 40 times, the ground surface settlement amount of the last two times is not more than 1 centimeter, watering is carried out when the rolling is started, the watering amount reaches the ground of a field, accumulated water is reserved, and watering is carried out every 4 times in the rolling process.
And in the fourth step, the detection depth of the second heavy cone dynamic penetration test is not less than 6 meters.
The secondary compression coefficient inversion formula and the calculation process are as follows:
the occurrence of secondary compression settlement in the range of H depths in test zone 1 and test zone 2 is:
assuming that the new backfill test zone and the old backfill test zone reach the same secondary compression settlement level after the vibration rolling treatment, namely:
Δs1+S1＝Δs2+S2(3)
the inverse formula of the secondary compression derived from formula (1), formula (2) and formula (3) is:
Cα-a sub-compressibility factor
H- -soil thickness for heave contrast
s1The settling volume of the test zone 1 in the H thickness range
s2The settling volume of the test zone 2 in the H thickness range
Δs1Test zone 1 subcompression settling in the H thickness range
Δs2Test zone 2 subcompression settling in the H thickness range
tf1Completion time of backfilling in test area 1
tf2Completion time of backfilling in test area 2
ti-calculating the starting time by sub-compression
e0Ratio of pores
Aiming at the defect that the coral sand is not easy to sample soil, the coral sand secondary compression coefficient calculation method based on hydraulic fill history investigation can be used as an alternative method when determining the secondary compression coefficient, and provides parameter basis for the calculation of post-construction settlement after foundation treatment.
The invention provides a measuring and calculating method for the compression coefficient of the bottom layer of the blow-filling coral sand with nonuniform time and space. Different areas of hydraulic reclamation marine engineering are often hydraulic reclamation at different times and with different thicknesses, so that stratum consolidation degrees in different areas are different, later settlement difference is large, and the final settlement amount is difficult to accurately calculate by adopting a theory. The calculation method fully utilizes field historical conditions and test data, furthest regresses the history, simulates the historical process of stratum self-consolidation settlement completion, compares the stratum settlement data after new and old hydraulic reclamation and unequal thickness treatment, fully analyzes the historical difference of the stratum, obtains the history and the current commonality by the difference of the current data, performs comparative analysis, and further obtains the secondary compression coefficient which is more in line with the reality.
Detailed Description
The technical solution of the present invention will be further described with reference to the following examples:
examples
Taking the Markov airport reconstruction and extension project as an example, the method for determining the secondary compression coefficient of the coral sand comprises the following steps:
step one, selecting a region with backfill time between 1 month in 2001 and 2 months in 2005 by surveying historical satellite photos, and setting a test area 1. And a test area 2 is arranged at the position of which the backfill completion time is 2017, 1 month, and the cell test time is 2017, 4 months. I.e. tf1149 months, tf23 months;
step two, respectively carrying out a first dynamic penetration test in the test area 1 and the test area 2;
step three, respectively carrying out vibration rolling in two test areas by adopting vibration rolling equipment with the weight not less than 36t, and recording the earth surface settlement, wherein the average earth surface settlement of the test area 1 is 99 mm, and the average earth surface settlement of the test area 2 is 257 mm;
step four, respectively carrying out a second dynamic penetration test in the test area 1 and the test area 2;
step five, analyzing the dynamic penetration test twice, wherein the vibration influence depth of the test area 1 is 2.7 meters, and the vibration influence depth of the test area 2The degree is 4.5 meters, the contrast vibration influence depth H is 2.7 meters, and the vibration and sinking quantities s of the test area 1 and the test area 2 are within the thickness range of H1And s299.0mm and 154.2mm (257X 2.7/4.5), respectively.
Obtaining the void ratio e of the coral sand through geotechnical test0The range is 0.761.
Substituting the data into formula (4) to obtain CαIs 0.021.
Claims (8)
1. A coral sand secondary compression coefficient measuring method based on a hydraulic reclamation test is characterized in that: the method comprises the following steps:
step one, determining two test areas
Carrying out hydraulic reclamation historical investigation near an engineering site, arranging a test area 1 in an original coral sand area, and requiring that the stratum backfill time of the test area 1 is more than 3 years and the backfill thickness is not less than 5 m; setting another test area 2 in the newly backfilled coral sand area, wherein the backfilling time of the test area 2 is required to be more than 3 months, and the backfilling thickness is not less than 5 m;
step two, leveling field and dynamic penetration test
Leveling the test area 1 and the test area 2 to meet the requirement of a vibrating roller mill capable of walking stably, and then carrying out a heavy cone dynamic penetration test;
step three, vibrating and rolling
Respectively carrying out vibration rolling in the two test areas by adopting vibration rolling equipment, and recording the settlement of the earth surface;
step four, the second dynamic penetration test
And after the vibration rolling is finished, carrying out a second dynamic heavy cone penetration test at a position which is less than 1 m away from the heavy cone dynamic penetration test point in the second step, wherein the test depth is not less than 6 m.
Step five, analyzing data and inverting a secondary compression consolidation coefficient
And calculating by using a secondary compression coefficient inversion formula to obtain a secondary compression consolidation coefficient according to the secondary dynamic sounding data and the surface subsidence data of the two test areas.
2. The method for measuring the secondary compressibility of coral sand based on the blow-filling test as claimed in claim 1, wherein: the two test sites in the step one are not less than 10 meters multiplied by 50 meters.
3. The method for measuring the secondary compressibility of coral sand based on the blow-filling test as claimed in claim 1, wherein: the number of test points of the heavy cone dynamic penetration test in the step one is not less than 6, and the detection depth is not less than 6 meters.
4. The method for measuring the secondary compressibility of coral sand based on the blow-filling test as claimed in claim 1, wherein: the vibration rolling equipment with the length not less than 26t is adopted for vibration rolling, the vibration rolling is required to be not less than 40 times, the ground surface settlement amount of the last two times is not more than 1 centimeter, watering is carried out when the rolling is started, the watering amount reaches the ground of a field, accumulated water is reserved, and watering is carried out every 4 times in the rolling process.
5. The method for measuring the secondary compressibility of coral sand based on the blow-filling test as claimed in claim 1, wherein: and in the fourth step, the detection depth of the second heavy cone dynamic penetration test is not less than 6 meters.
6. The method for measuring the secondary compressibility of coral sand based on the blow-filling test as claimed in claim 1, wherein: in the first step, the two test fields are not less than 10 meters multiplied by 50 meters, the number of test points of the heavy cone dynamic penetration test is not less than 6 points, and the detection depth is not less than 6 meters.
7. The method for measuring the secondary compressibility of coral sand based on the blow-filling test as claimed in claim 1, wherein: in the first step, the two test fields are not less than 10 meters multiplied by 50 meters, and the number of test points of the heavy cone dynamic penetration test is 8.
8. The method for measuring the secondary compressibility of coral sand based on the blow-filling test as claimed in claim 1, wherein: in the first step, the detection depth is 8 meters.
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