CN113505417B - Method for predicting water pressure distribution of super pore in static pressure penetration process of open tubular pile - Google Patents
Method for predicting water pressure distribution of super pore in static pressure penetration process of open tubular pile Download PDFInfo
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Abstract
The invention relates to a method for predicting the water pressure distribution of a super pore in the static pressure penetration process of an open tubular pile, which comprises the following steps: parameters affecting the water pressure of the super pore are obtained according to the construction condition of the site, wherein the parameters comprise the radius of an open tubular pile, the depth of penetration of soil, the non-drainage shear strength, the elastic modulus and the super-consolidation ratio of the soil body; determining a normalization parameter according to the parameter; determining a calculation formula of the maximum value of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction, and further determining a calculation formula of the maximum value of the soil body excess pore water pressure at the periphery of the pile body in the depth direction; and substituting the parameters and the normalization parameters into the calculation formula to determine the vertical distribution condition and the radial distribution condition of the excess pore water pressure of the soil body in the static pressure penetration process of the open tubular pile. The prediction method provided by the invention has the advantages of more comprehensive consideration factors, more accurate prediction results and high economic benefit, and is suitable for static pressure construction engineering of the open tubular pile in saturated soft soil.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to a method for predicting the water pressure distribution of a super pore in the static pressure penetration process of an open tubular pile.
Background
In sites with high requirements on noise and vibration, such as urban areas and public building groups, static pressure steel pipe piles are widely favored, but in saturated soft soil, soil body excess pore water pressure response caused by the continuous penetration process of the steel pipe piles threatens the safety of buildings (structures) within a certain range around, even causes engineering accidents, and in addition, excess pore water pressure response of adjacent soil bodies also causes the change of soil body effective stress, thereby affecting the self penetration resistance of the steel pipe piles and the aging of pile foundation bearing capacity. Therefore, in engineering construction, the soil body excess pore water pressure distribution condition caused by continuous penetration of the steel pipe pile needs to be evaluated in advance, so that the construction efficiency and the economic benefit are improved.
At present, the research on the water pressure response of the soil body super pore caused by the static pressure penetration process of the steel pipe pile is mainly based on a round hole expansion theory, namely: the influence of the earth surface and the pile tip and the influence of the vertical friction of the hole wall are ignored, and the stress of the soil body around the pile is only related to the radial coordinate and is not related to the vertical coordinate. Although the radial distribution of the excess pore water pressure caused by the static pressure penetration process of the steel pipe pile can be predicted based on the assumption, the radial distribution is only related to the rigidity ratio of the soil body and is irrelevant to the vertical coordinate, and the effect of the radius of the steel pipe pile, the penetration depth, the non-drainage shear strength, the elastic modulus and the excess consolidation ratio of the soil body on the excess pore water pressure caused by the static pressure penetration process of the steel pipe pile can be simultaneously known through the prior study. In addition, the pile end of the steel pipe column is divided into two forms of closed and open, and the round hole expansion theory mainly aims at the closed steel pipe pile, and the influence of the soil plug effect on the open steel pipe pile is also needed to be considered. Therefore, when the radial distribution of the soil body excess pore water pressure caused by the static pressure penetration process of the open steel pipe pile is predicted based on the round hole expansion theory, a larger error exists between the predicted value and the actual value.
Disclosure of Invention
In order to solve the problems, the invention provides a method for predicting the water pressure distribution of the excess pore in the static pressure penetration process of the open tubular pile, which has more comprehensive consideration factors, more accurate prediction results and high economic benefit, and is suitable for static pressure construction engineering of the open tubular pile in saturated soft soil.
The invention is realized by the following scheme: a method for predicting the distribution of excess pore water pressure in the static pressure penetration process of an open tubular pile comprises the following steps:
Parameters affecting the excess pore water pressure are obtained according to the construction condition of the site, wherein the parameters comprise the radius R p of an open tubular pile, the soil penetration depth z p, the non-drainage shear strength c u of the soil body, the elastic modulus E and the excess junction ratio OCR;
Determining normalized parameters from the parameters Η E＝E/Es、ηOCR＝OCROCRs, wherein R p s、cu s、Es、OCRs is a known corresponding standard parameter;
determining a calculation formula (1) of a maximum value delta u max/cu of soil body excess pore water pressure at a dimensionless pile body in the depth direction:
Wherein v is the poisson ratio of soil, alpha f is the Henkel pore pressure coefficient, alpha p is the dimensionless coefficient, and a is the soil plug effect critical value;
Substituting the parameters and the normalization parameters into the calculation formula (1), and determining the depth distribution condition of the maximum value of the excess pore water pressure in the depth direction in the static pressure penetration process of the open tubular pile.
The invention relates to a further improvement of a method for predicting the distribution of excess pore water pressure in the static pressure penetrating process of an open tubular pile, which comprises the following steps of determining a calculation formula (1) of a maximum value Deltau max/cu of the excess pore water pressure of a soil body at a dimensionless pile body in the depth direction:
establishing a finite element model for simulating the static pressure penetration process of the open tubular pile;
In the static pressure penetrating process of the simulated open tubular pile, inputting the parameters with different values, obtaining the corresponding maximum value Deltau max of the soil body excess pore water pressure at the pile body in the depth direction at different penetration depths, and fitting the relation of the maximum value Deltau max/cu of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction on the basis of the maximum value Deltau 0/cu of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction based on the round hole expansion theory:
wherein d 3 is the depth of the maximum value Deltau max of the soil body excess pore water pressure in the depth direction at the pile body, and the calculation formula of the maximum value Deltau 0/cu of the soil body excess pore water pressure in the depth direction at the pile body based on the dimensionless circular hole expansion theory is as follows:
As can be seen from the relational expressions (2-1) to (2-4), when (Δu max/cu)/(Δu0/cu) is used as a dependent variable, the independent variable ψ is:
And further fitting the dependent variable and the independent variable to obtain a relation:
according to the relation between the dimensionless coefficient alpha p＝d3/zp and the dimensionless z p/Rp, a relation is obtained:
d3＝αp·zp (6)
substituting the relation (6) into the formula (4):
Further, the above-mentioned calculation formula (1) is obtained by substituting the relation (3) and the relation (7) into the relation (5).
The invention relates to a method for predicting the distribution of excess pore water pressure in the static pressure penetration process of an open tubular pile, which is further improved by the following steps:
The calculation formula of the maximum value delta u/c u of the excess pore water pressure of the soil body around the pile body in the depth direction based on the round hole expansion theory is as follows:
Deducing a calculation formula of a maximum value delta u'/c u of the excess pore water pressure of the soil body around the dimensionless pile body in the depth direction according to the calculation formula (1) and the calculation formula (8):
wherein r is the radial distance from the pile body;
Substituting the parameters and the normalization parameters into a calculation formula (9) to determine the radial distribution condition of the excess pore water pressure in the static pressure penetration process of the open tubular pile.
The invention further improves the method for predicting the distribution of the excess pore water pressure in the static pressure penetration process of the open tubular pile, wherein the Henkel pore pressure coefficient alpha f is obtained through a consolidation non-drainage shear test.
The invention further improves the method for predicting the distribution of the excess pore water pressure in the static pressure penetration process of the open tubular pile, wherein the value of the soil plug effect critical value a is 0.33m.
The method for predicting the excess pore water pressure distribution in the static pressure injection process of the open tubular pile comprehensively considers the influences of the radius, the depth of penetration, the non-drainage shear strength, the elastic modulus, the excess-solid ratio and the soil plug effect of the open tubular pile, can accurately predict the vertical distribution condition and the radial distribution condition of the excess pore water pressure of the soil body caused in the static pressure continuous injection process of the open tubular pile, further provides a basis for evaluating the influence of the static pressure injection of the open tubular pile on the safety, the self injection resistance and the pile foundation bearing capacity aging of a building in a certain range around, has more comprehensive consideration factors, more accurate prediction results and high economic benefit, and is suitable for static pressure construction engineering of the open tubular pile in saturated soft soil.
Drawings
Fig. 1 shows a flow chart of a method for predicting the water pressure distribution of a super pore in the static pressure penetration process of an open tubular pile.
Fig. 2 shows a graph of a fit of the dependent variable (Δu max/cu)/(Δu0/cu) affected by the pile penetration depth z p and the radius R p.
Fig. 3 shows a graph of a fit of the dependent variable (Δu max/cu)/(Δu0/cu) affected by the pile penetration depth z p and the non-drainage shear strength c u of the soil.
Fig. 4 shows a graph of a fitting of the dependent variable (Δu max/cu)/(Δu0/cu) affected by the pile penetration depth z p and the elastic modulus E of the soil mass.
Fig. 5 shows a graph of a fitting of the dependent variable (Δu max/cu)/(Δu0/cu) as a function of the pile penetration depth z p and the oversolidification ratio OCR of the soil mass.
Fig. 6 shows a graph of the total fit of the dependent variable (Δu max/cu)/(Δu0/cu) as a function of the pile penetration z p, radius R p, non-drainage shear strength c u of the soil mass, modulus of elasticity E, overstock ratio OCR.
Fig. 7 shows a graph of a fit of the relationship between the dimensionless coefficient α p＝d3/zp and the dimensionless z p/Rp during the hydrostatic penetration of an open tubular pile.
Detailed Description
The prior art is based on a distribution prediction method of super pore water pressure caused by a static pressure penetration process of a steel pipe pile, mainly aims at a closed steel pipe pile, is only related to the rigidity ratio of a soil body (namely the ratio of the elastic modulus of the soil body to the shear strength of non-drainage), does not consider the influence of the penetration depth, and has the problem that a large error exists between a prediction result and an actual value. Aiming at the problem, the invention provides a method for predicting the water pressure distribution of the excess pore in the static pressure injection process of the open tubular pile, which comprehensively considers the influences of the radius, the soil penetration depth, the non-drainage shear strength, the elastic modulus, the excess-solid junction ratio and the soil plug effect of the tubular pile, has more comprehensive consideration factors, more accurate prediction results and high economic benefit, and is suitable for static pressure construction engineering of the open steel pipe pile in saturated soft soil.
The method for predicting the water pressure distribution of the ultra-pore in the static pressure penetration process of the open tubular pile is further described below by using a specific embodiment in combination with the accompanying drawings.
Referring to fig. 1, fig. 1 shows a flow chart of a method for predicting the water pressure distribution of a super pore in the static pressure penetration process of an open tubular pile. A method for predicting the distribution of excess pore water pressure in the static pressure penetration process of an open tubular pile comprises the following steps:
And S1, acquiring parameters (mainly obtained by known construction parameters and soil parameters) influencing the excess pore water pressure according to the construction condition of the site, wherein the parameters comprise the radius R p of the open tubular pile, the depth of penetration z p, the non-drainage shear strength c u of the soil body, the elastic modulus E and the excess-solid ratio OCR.
Step S2, determining normalization parameters according to the parametersΗ E＝E/Es、ηOCR＝OCROCRs, where R p s＝0.22m、cu s＝24.3kPa、Es＝10917kPa、OCRs =2 is the known corresponding standard construction parameters and soil parameters.
Step S3, determining a calculation formula (1) of a maximum value Deltau max/cu of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction:
Wherein: v is the poisson ratio of soil; alpha f is the Henkel pore pressure coefficient, which can be obtained through a consolidation non-drainage shear test, and is generally 0.35; alpha p is a dimensionless coefficient, and is determined according to the radius R p of the open tubular pile and the soil penetration depth z p; a is a soil plug effect critical value, and because part of soil can be extruded into the steel pipe to form a soil core in the static pressure injection process of the open tubular pile, the soil core can generate a soil arch effect near the pile end to block the tubular pile to prevent the soil from entering the tubular pile when R p is less than 0.33 m; when R p is more than or equal to 0.33m, the soil arch effect cannot completely prevent soil from entering the pipe pile, and the height of a soil core in the pipe pile can be increased along with the penetration of the pipe pile, so that the critical value of the soil plug effect is 0.33m.
And S4, selectively substituting the parameter and the normalization parameter into the calculation formula (1) according to the value of the tubular pile radius R p, determining the depth distribution condition of the maximum value of the excess pore water pressure in the depth direction in the static pressure penetration process of the open tubular pile, and drawing a corresponding vertical distribution curve of the maximum value of the excess pore water pressure in the depth direction in the static pressure penetration process of the open tubular pile, which is comprehensively influenced by the parameter and the soil plug effect, according to the calculation formula (1).
Further, referring to fig. 2 to 7, the step of determining the calculation formula (1) of the maximum value Δu max/cu of the soil body excess pore water pressure in the depth direction at the non-dimensional pile body includes:
establishing a finite element model for simulating the static pressure penetration process of the open tubular pile;
In the static pressure penetration process of the simulated open tubular pile, the parameters with different values are input, specifically, the value range of the radius R p of the open tubular pile is (0.11 m-0.55 m), the value range of the non-drainage shear strength c u of the soil body is (10 kPa-70 kPa), the value range of the elastic modulus E is (4852 kPa-24260 kPa), the value range of the oversolidification ratio OCR is (1-8), and the value range of the penetration depth z p of the tubular pile is (0 m-9.0 m). According to the values of the parameters, obtaining the maximum value delta u max of the soil body excess pore water pressure at the pile body in the depth direction when corresponding different depths enter the soil, respectively fitting the maximum value delta u max/cu of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction, and obtaining fitting curves of the soil body excess pore water pressure at the pile body in the depth direction influenced by the parameters on the basis of the maximum value delta u 0/cu (namely (delta u max/cu)/(Δu0/cu)) of the soil body excess pore water pressure at the non-dimensional pile body based on the round hole expansion theory, wherein the fitting curves are respectively shown in figures 2-5, and the following corresponding relational expressions are obtained:
In the figure, R 2 reflects the fitting degree of a regression model, d 3 is the depth of the maximum value Deltau max of the soil body excess pore water pressure at the pile body in the depth direction, and a calculation formula of the maximum value Deltau 0/cu of the soil body excess pore water pressure at the pile body in the depth direction based on the dimensionless pile body of the round hole expansion theory (the calculation formula only considers the influence of the stiffness ratio I r＝E/cu) is as follows:
As can be seen from the relational expressions (2-1) to (2-4), when (Δu max/cu)/(Δu0/cu) is used as a dependent variable, the independent variable ψ is:
further fitting the dependent variable and the independent variable to obtain a fitting curve as shown in fig. 6 and the following relation:
Referring to fig. 7, the dimensionless coefficient α p＝d3/zp is inversely related to the dimensionless z p/Rp, and the effect is more obvious when z p/Rp is smaller, and as z p/Rp increases, the amplitude is gradually reduced and finally approaches 1, so as to obtain the relation:
d3＝αp·zp (6)
substituting the relation (6) into the formula (4):
And substituting the relation (3) and the relation (7) into the relation (5) to obtain a calculation formula (1) of the maximum value Deltau max/cu of the soil body excess pore water pressure in the depth direction at the dimensionless pile body.
As a preferred embodiment:
The calculation formula of the maximum value delta u/c u of the excess pore water pressure of the soil body around the pile body in the depth direction based on the round hole expansion theory (the calculation formula only considers the influence of the stiffness ratio I r＝E/cu) is as follows:
according to the round hole expansion theory, the calculation formula (3) of the maximum value deltau 0/cu of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction is obtained according to R P = R according to the calculation formula (8), and based on the same prediction principle, the calculation formulas of the maximum value deltau'/c u of the soil body excess pore water pressure at the periphery of the non-dimensional pile body in the depth direction can be deduced according to the calculation formula (1) and the calculation formula (8):
wherein r is the radial distance from the pile body;
and substituting the parameter and the normalization parameter into a calculation formula (9) to determine the radial distribution condition of the excess pore water pressure in the static pressure penetration process of the open tubular pile.
The prediction method comprehensively considers the influences of the radius R p, the penetration depth z p, the non-drainage shear strength c u, the elastic modulus E, the oversolidation ratio OCR and the soil plug effect of the open tubular pile, can accurately predict the vertical distribution condition and the radial distribution condition of the soil body superporous water pressure caused in the static pressure continuous penetration process of the open tubular pile, further provides a basis for evaluating the influence of the static pressure penetration of the open tubular pile on the safety of a building (structure) in a certain range around, the self penetration resistance and the pile foundation bearing capacity aging, has more comprehensive consideration factors, more accurate prediction result and high economic benefit, and is suitable for static pressure construction engineering of the open tubular pile in saturated soft soil.
The present invention has been described in detail with reference to the embodiments of the drawings, and those skilled in the art can make various modifications to the invention based on the above description. Accordingly, certain details of the illustrated embodiments are not to be taken as limiting the invention, which is defined by the appended claims.
Claims (4)
1. A method for predicting the distribution of excess pore water pressure in the static pressure penetration process of an open tubular pile is characterized by comprising the following steps:
Parameters affecting the excess pore water pressure are obtained according to the construction condition of the site, wherein the parameters comprise the radius R p of an open tubular pile, the soil penetration depth z p, the non-drainage shear strength c u of the soil body, the elastic modulus E and the excess junction ratio OCR;
Determining normalized parameters from the parameters Η E＝E/Es、ηOCR＝OCR/OCRs, wherein R p s、cu s、Es、OCRs is a known corresponding standard parameter;
determining a calculation formula (1) of a maximum value delta u max/cu of soil body excess pore water pressure at a dimensionless pile body in the depth direction:
Wherein v is the poisson ratio of soil, alpha f is the Henkel pore pressure coefficient, alpha p is the dimensionless coefficient, and a is the soil plug effect critical value;
substituting the parameters and the normalization parameters into the calculation formula (1) to determine the depth distribution condition of the maximum value of the excess pore water pressure in the depth direction in the static pressure penetration process of the open tubular pile;
The calculation formula of the maximum value delta u/c u of the excess pore water pressure of the soil body around the pile body in the depth direction based on the round hole expansion theory is as follows:
Deducing a calculation formula of a maximum value delta u'/c u of the excess pore water pressure of the soil body around the dimensionless pile body in the depth direction according to the calculation formula (1) and the calculation formula (8):
wherein r is the radial distance from the pile body;
Substituting the parameters and the normalization parameters into a calculation formula (9) to determine the radial distribution condition of the excess pore water pressure in the static pressure penetration process of the open tubular pile.
2. The method for predicting the distribution of excess pore water pressure in the static pressure penetration process of an open tubular pile according to claim 1, wherein the step of determining the calculation formula (1) of the maximum value deltau max/cu of the excess pore water pressure of the soil body at the non-dimensional pile body in the depth direction comprises:
establishing a finite element model for simulating the static pressure penetration process of the open tubular pile;
In the static pressure penetrating process of the simulated open tubular pile, inputting the parameters with different values, obtaining the corresponding maximum value Deltau max of the soil body excess pore water pressure at the pile body in the depth direction at different penetration depths, and fitting the relation of the maximum value Deltau max/cu of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction on the basis of the maximum value Deltau 0/cu of the soil body excess pore water pressure at the non-dimensional pile body in the depth direction based on the round hole expansion theory:
wherein d 3 is the depth of the maximum value Deltau max of the soil body excess pore water pressure in the depth direction at the pile body, and the calculation formula of the maximum value Deltau 0/cu of the soil body excess pore water pressure in the depth direction at the pile body based on the dimensionless circular hole expansion theory is as follows:
As can be seen from the relational expressions (2-1) to (2-4), when (Δu max/cu)/(Δu0/cu) is used as a dependent variable, the independent variable ψ is:
And further fitting the dependent variable and the independent variable to obtain a relation:
according to the relation between the dimensionless coefficient alpha p＝d3/zp and the dimensionless z p/Rp, a relation is obtained:
d3＝αp·zp (6)
substituting the relation (6) into the formula (4):
Further, the above-mentioned calculation formula (1) is obtained by substituting the relation (3) and the relation (7) into the relation (5).
3. The method for predicting the water pressure distribution of the superporous in the static pressure penetrating process of the open tubular pile according to claim 1, wherein the Henkel pore pressure coefficient alpha f is obtained by a consolidation non-drainage shear test.
4. The method for predicting the water pressure distribution of the ultra-pore in the static pressure penetration process of the open tubular pile according to claim 1, wherein the soil plug effect critical value a takes a value of 0.33m.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2011257212A (en) * | 2010-06-08 | 2011-12-22 | Institute Of National Colleges Of Technology Japan | Neutralization depth prediction device of concrete structure and program for instructing computer to calculate neutralization depth |
| CN110029692A (en) * | 2019-04-24 | 2019-07-19 | 上海应用技术大学 | The method for determining bearing capacity of single pile timeliness in weak soil based on SCPTu probe test value |
| CN110377935A (en) * | 2019-06-06 | 2019-10-25 | 上海交通大学 | Prediction technique of the pile peripheral earth excess pore water pressure along change in depth in pile driving process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011257212A (en) * | 2010-06-08 | 2011-12-22 | Institute Of National Colleges Of Technology Japan | Neutralization depth prediction device of concrete structure and program for instructing computer to calculate neutralization depth |
| CN110029692A (en) * | 2019-04-24 | 2019-07-19 | 上海应用技术大学 | The method for determining bearing capacity of single pile timeliness in weak soil based on SCPTu probe test value |
| CN110377935A (en) * | 2019-06-06 | 2019-10-25 | 上海交通大学 | Prediction technique of the pile peripheral earth excess pore water pressure along change in depth in pile driving process |
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