CN110244025B - Method and system for obtaining historical excess consolidation ratio of peat soil stress - Google Patents

Method and system for obtaining historical excess consolidation ratio of peat soil stress Download PDF

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CN110244025B
CN110244025B CN201910621596.XA CN201910621596A CN110244025B CN 110244025 B CN110244025 B CN 110244025B CN 201910621596 A CN201910621596 A CN 201910621596A CN 110244025 B CN110244025 B CN 110244025B
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王洋
秦夏强
许海岩
娄建军
苗闫闫
刘金凤
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China MCC20 Group Corp Ltd
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Abstract

The invention discloses a method and a system for acquiring a historical excess consolidation ratio of peat soil stress, and more particularly relates to the technical field of geotechnical engineering. The method comprises the following steps: performing a static sounding test on a peat soil exploration field to obtain a test result, and analyzing the test result to obtain an analysis result; obtaining the resistance q of the tip of the correction probe according to the analysis resultTAcquiring survey report data of a peat soil exploration site, and correcting the cone tip resistance q of the probeTAcquiring initial value OCR of super-consolidation ratio according to semi-empirical and semi-analytical formula1(ii) a According to the initial value of the super consolidation ratio OCR1And acquiring the super consolidation ratio OCR of the peat soil by the survey report data. The method has high applicability and accuracy, can be compared and analyzed with the indoor consolidation test result, finally improves the accuracy, adaptability and feasibility of the design of the soft peat soil foundation, and can be used as a reference basis for the design of the soft peat soil foundation.

Description

Method and system for obtaining historical excess consolidation ratio of peat soil stress
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a method and a system for acquiring a historical excess consolidation ratio of peat soil stress.
Background
Peat soil is very special soft soil, has high moisture content, high compressibility, low strength, high thixotropy, high sensitivity etc. and is often the flow plastic state, and its characteristic has decided that it is comparatively difficult to take a sample in the investigation stage of earlier stage, even can take a sample, the disturbance degree is also very big, further causes the unable true basic feature who reflects peat soil itself of indoor test parameter, reduces to a wide margin to the guiding effect of design, construction. Meanwhile, the stress history super-consolidation ratio OCR has great influence on the settlement of the building, and the value size of the stress history super-consolidation ratio OCR has great influence on the design of the soft foundation, the post-processing construction period and the cost.
Disclosure of Invention
The invention provides a method for acquiring a historical excess consolidation ratio of peat soil stress, aiming at the problems, comprising the following steps:
performing a static sounding test on a peat soil exploration field to obtain a test result, and analyzing the test result to obtain an analysis result;
the analysis result comprises: probe cone tip resistance qcSide friction resistance fsAnd the value u of the pressure in the penetration holeT；
Obtaining the resistance q of the tip of the correction probe according to the analysis resultTAcquiring survey report data of a peat soil exploration site, and correcting the cone tip resistance q of the probeTAcquiring initial value OCR of super-consolidation ratio according to semi-empirical and semi-analytical formula1；
According to the initial value of the super consolidation ratio OCR1Acquiring the super consolidation ratio OCR of the peat soil from the survey report data;
the OCR for obtaining the peat soil super-consolidation ratio specifically comprises the following steps:
OCR (optical character recognition) initial value of super consolidation ratio1The substitution of (c) is as follows:
Figure GDA0002779771860000021
wherein n is coefficient, n is 0.11+0.0037IpAnd m is the power of IpIs the plasticity index of the peat soil;
obtaining the value of the power m according to the formula (1), and according to the following formula:
Figure GDA0002779771860000022
and obtaining the super consolidation ratio OCR of the peat soil.
Optionally, the resistance q of the tip of the probe is obtained and corrected according to the analysis resultTThe corrected probe cone tip resistance qTThe acquisition formula is as follows:
qT＝qc+(1-α)uT (3)
wherein α ═ Fα/A，FαThe effective area of the end face of the conical tip and A are the total cross-sectional area of the probe.
Optionally, the survey report data comprises: plasticity index of peat soil IpAnd effective dead weight pressure sigma 'of peat soil'v0Effective internal friction angle of peat soil
Figure GDA0002779771860000023
Gradient M of critical state curve and shear strength S of peat soil without drainageu。
Optionally, the semi-empirical semi-analytical formula is as follows:
Figure GDA0002779771860000024
wherein the content of the first and second substances,
Figure GDA0002779771860000025
Figure GDA0002779771860000026
the effective internal friction angle of the peat soil.
The invention also provides a system for acquiring the historical excess consolidation ratio of the stress of the peat soil, which comprises the following steps:
the analysis module is used for carrying out static sounding test on the peat soil exploration field to obtain a test result, and analyzing the test result to obtain an analysis result;
the analysis result comprises: probe cone tip resistance qcSide friction resistance fsAnd the value u of the pressure in the penetration holeT；
A first calculation module for obtaining the analysis resultCorrecting probe cone tip resistance qTAcquiring survey report data of a peat soil exploration site, and correcting the cone tip resistance q of the probeTAcquiring initial value OCR of super-consolidation ratio according to semi-empirical and semi-analytical formula1；
A second calculation module for OCR according to the initial value of the hypercuring ratio1Acquiring the super consolidation ratio OCR of the peat soil from the survey report data;
the OCR for obtaining the peat soil super-consolidation ratio specifically comprises the following steps:
OCR (optical character recognition) initial value of super consolidation ratio1The substitution of (c) is as follows:
Figure GDA0002779771860000031
wherein n is coefficient, n is 0.11+0.0037IpAnd m is the power of IpIs the plasticity index of the peat soil;
obtaining the value of the power m according to the formula (1), and according to the following formula:
Figure GDA0002779771860000032
and obtaining the super consolidation ratio OCR of the peat soil.
Optionally, the resistance q of the tip of the probe is obtained and corrected according to the analysis resultTThe corrected probe cone tip resistance qTThe acquisition formula is as follows:
qT＝qc+(1-α)uT
wherein α ═ Fα/A，FαThe effective area of the end face of the conical tip and A are the total cross-sectional area of the probe.
Optionally, the survey report data comprises: plasticity index of peat soil IpAnd effective dead weight pressure sigma 'of peat soil'v0Effective internal friction angle of peat soil
Figure GDA0002779771860000033
Gradient M of critical state curve and shear strength S of peat soil without drainageu。
Optionally, the semi-empirical semi-analytical formula is as follows:
Figure GDA0002779771860000034
wherein the content of the first and second substances,
Figure GDA0002779771860000035
Figure GDA0002779771860000036
the effective internal friction angle of the peat soil.
The method has high applicability and accuracy, can be compared and analyzed with the indoor consolidation test result, finally improves the accuracy, adaptability and feasibility of the design of the soft peat soil foundation, and can be used as a reference basis for the design of the soft peat soil foundation.
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FIG. 1 is a flow chart of a method for obtaining a historical consolidation ratio of peat soil stress according to the present invention;
FIG. 2 is a block diagram of a system for obtaining a historical consolidation ratio for peat soil stress according to the present invention;
FIG. 3a is a method q for obtaining the historical consolidation ratio of peat soil stress according to the present inventioncA depth map;
FIG. 3b is a method f for obtaining the historical consolidation ratio of peat soil stress according to the present inventionsA depth map;
FIG. 3c is a method u for obtaining the historical consolidation ratio of peat soil stress according to the present inventionTA depth map.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for acquiring a historical excess consolidation ratio of peat soil stress, which comprises the following steps of:
performing a static sounding test on a peat soil exploration field to obtain a test result, and analyzing the test result to obtain an analysis result;
the analysis result comprises the following steps: probe cone tip resistance qcSide friction resistance fsAnd the value u of the pressure in the penetration holeT；
Probe cone tip resistance qcSide friction resistance fsAnd the value u of the pressure in the penetration holeTAs shown in fig. 3a, 3b and 3c, respectively;
obtaining the resistance q of the tip of the correction probe according to the analysis resultTCorrecting the resistance q of the probe cone tipTThe acquisition formula is as follows:
qT＝qc+(1-α)uT (1)
wherein α ═ Fα/A，FαThe effective area of the end face of the cone tip and A is the total cross section area of the cone tip (probe).
Acquiring survey report data of a peat soil exploration site, wherein the survey report data comprises: plasticity index of peat soil IpAnd effective dead weight pressure sigma 'of peat soil'v0Effective internal friction angle of peat soil
Figure GDA0002779771860000051
Gradient M of critical state curve and shear strength S of peat soil without drainageu。
Resistance q to the tip of the correction probeTAccording toSemi-empirical semi-analytical method for obtaining initial value OCR of super-consolidation ratio1The semi-empirical and semi-analytical formula is as follows:
Figure GDA0002779771860000052
wherein the content of the first and second substances,
Figure GDA0002779771860000053
according to the initial value of the super consolidation ratio OCR1And acquiring the super consolidation ratio OCR of the peat soil by the survey report data, wherein the method specifically comprises the following steps:
OCR (optical character recognition) initial value of super consolidation ratio1The substitution of (c) is as follows:
Figure GDA0002779771860000054
wherein n is coefficient, n is 0.11+0.0037IpAnd m is the power of the power;
obtaining the value of the power m according to the formula (3), and according to the following formula:
Figure GDA0002779771860000055
and obtaining the super consolidation ratio OCR of the peat soil.
The present invention further provides a system 200 for obtaining a historical consolidation ratio of peat soil stress, as shown in fig. 2, the system 200 comprising:
the analysis module 201 is used for carrying out static sounding test on a peat soil exploration field to obtain a test result, and analyzing the test result to obtain an analysis result;
the analysis result comprises the following steps: probe cone tip resistance qcSide friction resistance fsAnd the value u of the pressure in the penetration holeT；
A first calculation module 202 for obtaining a corrected probe cone tip resistance q according to the analysis resultTCorrecting the resistance q of the probe cone tipTThe acquisition formula is as follows:
qT＝qc+(1-α)uT
wherein α ═ Fα/A，FαThe effective area of the end face of the cone tip and A is the total cross section area of the cone tip (probe).
Acquiring survey report data of a peat soil exploration site, wherein the survey report data comprises: plasticity index of peat soil IpAnd effective dead weight pressure sigma 'of peat soil'v0Effective internal friction angle of peat soil
Figure GDA0002779771860000061
Gradient M of critical state curve and shear strength S of peat soil without drainageu。
Resistance q to the tip of the correction probeTAcquiring initial value OCR of super-consolidation ratio according to semi-empirical and semi-analytical formula1The semi-empirical and semi-analytical formula is as follows:
Figure GDA0002779771860000062
wherein the content of the first and second substances,
Figure GDA0002779771860000063
a second calculation module 203 for OCR according to the initial value of the super-consolidation ratio1And acquiring the super consolidation ratio OCR of the peat soil by the survey report data, wherein the method specifically comprises the following steps:
OCR (optical character recognition) initial value of super consolidation ratio1The substitution of (c) is as follows:
Figure GDA0002779771860000064
wherein n is coefficient, n is 0.11+0.0037IpAnd m is the power of the power;
obtaining the value of the power m according to the formula (3), and according to the following formula:
Figure GDA0002779771860000065
and obtaining the super consolidation ratio OCR of the peat soil.
The method has high applicability and accuracy, can be compared and analyzed with the indoor consolidation test result, finally improves the accuracy, adaptability and feasibility of the design of the soft peat soil foundation, and can be used as a reference basis for the design of the soft peat soil foundation.

Claims (8)

1. A method for obtaining a historical excess consolidation ratio for peat soil stress, the method comprising:
performing a static sounding test on a peat soil exploration field to obtain a test result, and analyzing the test result to obtain an analysis result;
the analysis result comprises: probe cone tip resistance qcSide friction resistance fsAnd the value u of the pressure in the penetration holeT；
Obtaining the resistance q of the tip of the correction probe according to the analysis resultTAcquiring survey report data of a peat soil exploration site, and correcting the cone tip resistance q of the probeTAcquiring initial value OCR of super-consolidation ratio according to semi-empirical and semi-analytical formula1；
According to the initial value of the super consolidation ratio OCR1Acquiring the super consolidation ratio OCR of the peat soil from the survey report data;
the OCR for obtaining the peat soil super-consolidation ratio specifically comprises the following steps:
OCR (optical character recognition) initial value of super consolidation ratio1Substituting into the following equation:
Figure FDA0002779771850000011
wherein n is coefficient, n is 0.11+0.0037IpM is the power of the order of IpIs peat soil plasticity index, Su is peat soil non-drainage shear strength, sigma'v0The effective dead weight pressure of the peat soil is obtained;
obtaining the value of the power m according to the formula (1), and according to the following formula:
Figure FDA0002779771850000012
and obtaining the super consolidation ratio OCR of the peat soil.
2. The method of claim 1, wherein obtaining the modified probe cone tip resistance q according to the analysis resultTThe corrected probe cone tip resistance qTThe acquisition formula is as follows:
qT＝qc+(1-α)uT (3)
wherein α ═ Fα/A，FαThe effective area of the end face of the conical tip and A are the total cross-sectional area of the probe.
3. The method of claim 1, said survey reporting data comprising: plasticity index of peat soil IpAnd effective dead weight pressure sigma 'of peat soil'v0Effective internal friction angle of peat soil
Figure FDA0002779771850000013
Gradient M of critical state curve and shear strength S of peat soil without drainageu。
4. The method of claim 1, the semi-empirical semi-analytical formula is as follows:
Figure FDA0002779771850000021
wherein the content of the first and second substances,
Figure FDA0002779771850000022
Figure FDA0002779771850000023
the effective internal friction angle of the peat soil.
5. A system for obtaining a historical excess consolidation ratio for peat soil stress, the system comprising:
the analysis module is used for carrying out static sounding test on the peat soil exploration field to obtain a test result, and analyzing the test result to obtain an analysis result;
the analysis result comprises: probe cone tip resistance qcSide friction resistance fsAnd the value u of the pressure in the penetration holeT；
The first calculation module acquires the resistance q of the tip of the probe according to the analysis resultTAcquiring survey report data of a peat soil exploration site, and correcting the cone tip resistance q of the probeTAcquiring initial value OCR of super-consolidation ratio according to semi-empirical and semi-analytical formula1；
A second calculation module for OCR according to the initial value of the hypercuring ratio1Acquiring the super consolidation ratio OCR of the peat soil from the survey report data;
the OCR for obtaining the peat soil super-consolidation ratio specifically comprises the following steps:
OCR (optical character recognition) initial value of super consolidation ratio1Substituting into the following equation:
Figure FDA0002779771850000024
wherein n is coefficient, n is 0.11+0.0037IpM is the power of the order of IpIs peat soil plasticity index, Su is peat soil non-drainage shear strength, sigma'v0The effective dead weight pressure of the peat soil is obtained;
obtaining the value of the power m according to the formula (3), and according to the following formula:
Figure FDA0002779771850000025
and obtaining the super consolidation ratio OCR of the peat soil.
6. The system of claim 5, wherein said obtaining a modified probe cone tip resistance q from said analysis resultsTThe corrected probe cone tip resistance qTThe acquisition formula is as follows:
qT＝qc+(1-α)uT
wherein α ═ Fα/A，FαThe effective area of the end face of the conical tip and A are the total cross-sectional area of the probe.
7. The system of claim 5, said survey report data comprising: plasticity index of peat soil IpAnd effective dead weight pressure sigma 'of peat soil'v0Effective internal friction angle of peat soil
Figure FDA0002779771850000031
Gradient M of critical state curve and shear strength S of peat soil without drainageu。
8. The system of claim 5, the semi-empirical semi-analytical formula is as follows:
Figure FDA0002779771850000032
wherein the content of the first and second substances,
Figure FDA0002779771850000033
Figure FDA0002779771850000034
the effective internal friction angle of the peat soil.
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