CN114112685B - Method for determining early consolidation stress of field compacted earth-rock mixture - Google Patents

Method for determining early consolidation stress of field compacted earth-rock mixture Download PDF

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CN114112685B
CN114112685B CN202111632639.8A CN202111632639A CN114112685B CN 114112685 B CN114112685 B CN 114112685B CN 202111632639 A CN202111632639 A CN 202111632639A CN 114112685 B CN114112685 B CN 114112685B
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mixture
earth
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ratio
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CN114112685A (en
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徐剑飞
王柳江
梁睿斌
段玉昌
徐祥
洪磊
刘斯宏
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Jiangsu Jurong Pumped Storage Co ltd
Hohai University HHU
State Grid Xinyuan Co Ltd
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Hohai University HHU
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • 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
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0023—Bending
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0025—Shearing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075—Strain-stress relations or elastic constants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0083—Rebound strike or reflected energy
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0085—Compressibility
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0212—Theories, calculations
    • G01N2203/0216—Finite elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0212—Theories, calculations
    • G01N2203/0218—Calculations based on experimental data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration

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  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Abstract

The invention discloses a method for determining early consolidation stress of a field compacted earth-stone mixture, which relates to the technical field, in particular to a method for determining early consolidation stress of a field compacted earth-stone mixture, and comprises the following steps: s1, carrying out a load test on 3 points on a soil-stone mixture foundation after field rolling is finished, and obtaining data of a loading-sedimentation p-S curve; s2, carrying out a density pit test on the site compacted earth-rock mixture foundation, and determining the initial pore ratio e of the compacted earth-rock mixture 0 . The invention avoids the problem of large sampling disturbance of the site compacted earth-stone mixture, and the obtained early consolidation stress can truly reflect the site compacted state; and an objective function is established by utilizing a multipoint test result, and the early consolidation stress is automatically searched and determined by utilizing an optimization algorithm, so that the influence of human factors in the traditional method is avoided, and the accuracy and rationality of an inversion result are ensured.

Description

Method for determining early consolidation stress of field compacted earth-rock mixture
Technical Field
The invention relates to the technical field of early consolidation stress determination of soil and stone mixtures, in particular to a method for determining early consolidation stress of a site compacted soil and stone mixture.
Background
In recent years, the construction of a pumped storage power station in China enters a high-speed development stage, and in order to realize the earth balance in the power station, earth-rock mixed excavation materials of a lower reservoir are adopted as the filling materials of the upper reservoir basin of a plurality of power stations, and how to control the deformation of the upper reservoir basin is a key problem for ensuring the safe operation of a reservoir basin seepage prevention system. At present, for the soil-stone mixture with poor engineering properties, a thin layer heavy rolling and vibration excitation rolling measure is generally adopted in engineering, so that the soil-stone mixture after site compaction is in an ultra-consolidation state, namely, early consolidation stress exists. Therefore, determining the early consolidation stress of the on-site compacted soil-stone mixture is important for accurately predicting the sedimentation of the reservoir basin and providing a reservoir basin deformation coordination control scheme. The Casagrande method is the most widely used method for determining the soil early consolidation stress internationally, but the method is not suitable for soil-stone mixed materials, the method needs to be sampled to a laboratory for testing, the test is inevitably disturbed in the process of sampling and transportation, and meanwhile, one great limitation of the method is that the method is obviously influenced by human factors and proportion factors. Therefore, the casagande method cannot be used to obtain the early consolidation stresses of the in-situ compacted earth-rock mixture.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for determining the early consolidation stress of a field compacted earth-stone mixture, which solves the problems in the prior art.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the method for determining the early consolidation stress of the site compacted earth-rock mixture comprises the following steps:
s1, carrying out a load test on 3 points on a soil-stone mixture foundation after field rolling is finished, and obtaining data of a loading-sedimentation p-S curve;
s2, carrying out a density pit test on the site compacted earth-rock mixture foundation, and determining the initial pore ratio e of the compacted earth-rock mixture 0 ；
S3, preparing a sample according to the initial pore ratio of the site compacted earth-rock mixture, carrying out an indoor large-scale consolidation compression test, acquiring e-lnp curve data of the pore ratio and the vertical load logarithm, and determining a compression index lambda and a rebound index kappa;
s4, preparing a sample according to the initial pore ratio of the site compacted earth-rock mixture, carrying out an indoor large triaxial compression test, and determining the critical state stress ratio M and the peak stress ratio M f ；
S5, establishing a yield function of the soil-stone mixture based on the corrected Cambridge model;
s6, taking the corrected Cambridge model as a reference yield surface;
s7, initial pore ratio e determined by test 0 Compression index lambda, rebound index kappa, critical state stress ratio M and peak stress ratio M f Substituting the yield function of the earth-rock mixture, taking the reference yield surface as an elastoplastic loading discrimination criterion, and deducing a stress-strain relation matrix;
s8, integrating a stress-strain relation matrix of the soil-stone mixture into a finite element program, establishing a three-dimensional simulation of a load test, establishing an objective function based on the following formula, carrying out inversion analysis on the early-stage consolidation stress of the field compacted soil-stone mixture by adopting a particle swarm algorithm, wherein the inversion-obtained early-stage consolidation stress can truly reflect the field rolling effect.
Optionally, the yield function in step S5:
wherein p is the average stress; q is the bias force; p is p 0 Is the initial average stress;is the plastic strain increment; h is the hardening parameter, is the critical state stress ratio M and the peak stress ratio M f Plastic strain increase->Is a function of (2).
Optionally, in the step S6, when the yield surface function f is referred to ref When the temperature is less than 0, the soil-stone mixture is in an elastic deformation stage, and when f ref After=0, the earth-rock mixture enters the plastic deformation stage:
f ref ＝q 2 -M 2 p(p c -p)
wherein p is c Is the early consolidation stress.
Optionally, the objective function in step S8:
wherein i is the number of the load test point, j is the number of the loading series, and n is the total loading series;for the corresponding sedimentation of the ith test point under the jth level load, s ij Is the corresponding calculated value.
The invention provides a method for determining early consolidation stress of a field compacted earth-stone mixture, which has the following beneficial effects:
according to the method, a vertical load-settlement curve is obtained through a load test, an indoor large-scale consolidation compression and triaxial shear test is carried out according to a field compaction state preparation sample, compression index, rebound index, peak stress ratio and critical state stress are determined, a yield function of the soil-rock mixture is established, a corrected Cambridge model containing the early consolidation stress is used as a reference yield surface, an inversion objective function is established, inversion of the early consolidation stress is carried out by a particle swarm optimization algorithm, and accuracy, reliability and rationality of inversion results can be ensured.
The invention avoids the problem of large sampling disturbance of the site compacted earth-stone mixture, and the obtained early consolidation stress can truly reflect the site compacted state; and an objective function is established by utilizing a multipoint test result, and the early consolidation stress is automatically searched and determined by utilizing an optimization algorithm, so that the influence of human factors in the traditional method is avoided, and the accuracy and rationality of an inversion result are ensured.
Drawings
FIG. 1 is a schematic diagram of a load test of the present invention;
FIG. 2 is a schematic diagram of a p-s curve of the present invention;
FIG. 3 is a schematic diagram of a parametric inversion analysis according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Description of the preferred embodiments
Referring to fig. 1 to 3, the present invention provides a technical solution: the method for determining the early consolidation stress of the site compacted earth-rock mixture comprises the following steps:
s1, carrying out a load test on 3 points on a soil-stone mixture foundation after field rolling is finished, and obtaining data of a loading-sedimentation (p-S) curve;
s2, carrying out a density pit test on the site compacted earth-rock mixture foundation, and determining the initial pore ratio e of the compacted earth-rock mixture 0 ；
S3, preparing a sample according to the initial pore ratio of the site compacted earth-rock mixture, carrying out an indoor large-scale consolidation compression test, acquiring p-S curve data of the pore ratio and the vertical load logarithm, and determining a compression index lambda and a rebound index kappa;
s4, preparing a sample according to the initial pore ratio of the site compacted earth-rock mixture, carrying out an indoor large triaxial compression test, and determining the critical state stress ratio M and the peak stress ratio M f ；
S5, establishing a yield function of the soil-stone mixture based on the corrected Cambridge model;
s6, taking the corrected Cambridge model as a reference yield surface;
s7, initial pore ratio e determined by test 0 Compression index lambda, rebound index kappa, critical state stress ratio M and peak stress ratio M f Substituting the yield function of the earth-rock mixture, taking the reference yield surface as an elastoplastic loading discrimination criterion, and deducing a stress-strain relation matrix;
s8, integrating a stress-strain relation matrix of the soil-stone mixture into a finite element program, establishing a three-dimensional simulation of a load test, establishing an objective function based on the following formula, carrying out inversion analysis on the early-stage consolidation stress of the field compacted soil-stone mixture by adopting a particle swarm algorithm, wherein the inversion-obtained early-stage consolidation stress can truly reflect the field rolling effect.
Optionally, the yield function in step S5:
wherein p is the average stress; q is the bias force; p is p 0 Is the initial average stress;is the plastic strain increment; h is the hardening parameter, is the critical state stress ratio M and the peak stress ratio M f Plastic strain increase->Is a function of (2).
Optionally, in the step S6, when the yield surface function f is referred to ref When the temperature is less than 0, the soil-stone mixture is in an elastic deformation stage, and when f ref After=0, the earth-rock mixture enters the plastic deformation stage:
f ref ＝q 2 -M 2 p(p c -p)
wherein p is c Is the early consolidation stress.
Optionally, the objective function in step S8:
wherein i is the number of the load test point, j is the number of the loading series, and n is the total loading series;for the corresponding sedimentation of the ith test point under the jth level load, s ij Is the corresponding calculated value.
Second embodiment
As shown in fig. 1-3, the basic idea of the invention is to establish a soil-stone mixture constitutive relation considering the influence of early consolidation stress, and take a p-s curve obtained by a load test as monitoring data of parameter inversion, so as to invert the early consolidation stress of the on-site compacted soil-stone mixture.
Step one: the method comprises the steps of (1) rolling a soil-stone mixture by adopting 26 tons of high-power vibration rolling, wherein the thickness of the rolling layer is 60cm, the running speed is 2-3 km/h, the number of rolling passes is 8, the exciting force is 410kN, and carrying out a plate load test on 3 test points on a compacted soil-stone mixture foundation to obtain sedimentation displacement of the compacted soil-stone mixture under different loads;
step two: performing a density pit test at the test point, and determining the pore ratio e of the compacted earth-rock mixture through water content measurement 0 ；
Step three: taking a soil-stone mixture at a test point, preparing a sample based on the pore ratio after site compaction, carrying out a large-scale consolidation compression test, carrying out compression-unloading-recompression, drawing an e-lnp curve according to pore ratio changes under different vertical loads, and determining a compression index lambda and a rebound index kappa;
step four: taking a soil-stone mixture at a test point, preparing a sample based on the pore ratio after site compaction, and carrying out a large triaxial shear test to obtain stress-strain curves under different confining pressures and obtain a stress ratio M corresponding to peak intensity f Stress ratio M of critical state;
step five: establishing a yield function of the soil-stone mixture, and determining the porosity e 0 Compression index lambda, rebound index kappa, peak stress ratio M f Critical state stress ratio M is brought in, at the same timeTaking a corrected Cambridge model containing the early consolidation stress as a reference yield surface, and deducing a stress-strain relation matrix;
f ref ＝q 2 -M 2 p(p c -p)
wherein p is the average stress; q is the bias force; p is p 0 Is the initial average stress;is the plastic strain increment; h is the hardening parameter, is the critical state stress ratio M and the peak stress ratio M f Plastic strain increase->Is a function of (2); pc is the early consolidation stress;
step six, establishing an objective function according to p-s curves obtained from different test points, and inverting the early consolidation stress of the field compacted earth-rock mixture by adopting a particle swarm algorithm;
wherein i is the number of the load test point, j is the number of the loading series, and n is the total loading series;for the corresponding sedimentation of the ith test point under the jth level load, s ij Is the corresponding calculated value.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.

Claims (1)

1. The method for determining the early consolidation stress of the site compacted earth-rock mixture is characterized by comprising the following steps of:
s1, carrying out a load test on 3 points on a soil-stone mixture foundation after field rolling is finished, and obtaining data of a loading-sedimentation p-S curve;
s2, carrying out a density pit test on the site compacted earth-rock mixture foundation, and determining the initial pore ratio e of the compacted earth-rock mixture 0 ；
S3, preparing a sample according to the initial pore ratio of the site compacted earth-rock mixture, carrying out an indoor large-scale consolidation compression test, acquiring e-lnp curve data of the pore ratio and the vertical load logarithm, and determining a compression index lambda and a rebound index kappa;
s4, preparing a sample according to the initial pore ratio of the site compacted earth-rock mixture, carrying out an indoor large triaxial compression test, and determining the critical state stress ratio M and the peak stress ratio M f ；
S5, establishing a yield function of the soil-stone mixture based on the corrected Cambridge model;
s6, taking the corrected Cambridge model as a reference yield surface;
s7, initial pore ratio e determined by test 0 Compression index lambda, rebound index kappa, critical state stress ratio M and peak stress ratio M f Substituting the yield function of the earth-rock mixture, taking the reference yield surface as an elastoplastic loading discrimination criterion, and deducing a stress-strain relation matrix;
s8, integrating a stress-strain relation matrix of the soil-stone mixture into a finite element program, establishing a three-dimensional simulation of a load test, establishing an objective function based on the following formula, and carrying out inversion analysis on the early-stage consolidation stress of the field compacted soil-stone mixture by adopting a particle swarm algorithm, wherein the inversion-obtained early-stage consolidation stress can truly reflect the field rolling effect;
yield function in step S5:
wherein p is the average stress; q is the bias force; p is p 0 Is the initial average stress;is the plastic strain increment; h is the hardening parameter, is the critical state stress ratio M and the peak stress ratio M f Plastic strain increase->Is a function of (2);
in the step S6, when the yield surface function f is referred to ref When the temperature is less than 0, the soil-stone mixture is in an elastic deformation stage, and when f ref After=0, the earth-rock mixture enters the plastic deformation stage:
f ref ＝q 2 -M 2 p(p c -p)
wherein p is c Is the early consolidation stress;
the objective function in step S8:
wherein i is the number of the load test point, j is the number of the loading series, and n is the total loading series;for the corresponding sedimentation of the ith test point under the jth level load, s ij Is the corresponding calculated value.
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JP3809374B2 (en) * 2001-12-27 2006-08-16 トヨタ自動車株式会社 Stress-strain relationship simulation method and method for obtaining yield point in unloading process
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