CN115146357B - Analysis method for influence of frost heaving of soil body on concrete panel - Google Patents
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- 239000002689 soil Substances 0.000 title claims abstract description 134
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- 238000004088 simulation Methods 0.000 claims abstract description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000005070 sampling Methods 0.000 claims description 9
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- 229920006395 saturated elastomer Polymers 0.000 claims description 7
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- 230000008014 freezing Effects 0.000 description 6
- 238000007710 freezing Methods 0.000 description 6
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Abstract
The invention discloses an analysis method of influence of frost heaving of a soil body on a concrete panel, which comprises the following steps: collecting canal system building data parameters, establishing a channel section three-dimensional geometric model, determining three-dimensional geometric model calculation parameters, selecting three-dimensional geometric model boundary conditions and analyzing influence of soil frost heaving on a concrete panel; according to the invention, three-dimensional numerical simulation is carried out on a typical section of a channel, a finite element method is adopted, the frost heaving displacement of a channel soil body obtained by theoretical calculation is used as a concrete panel load, the influence of the frost heaving of the soil body on deformation and stress of the concrete panel is analyzed, accurate lining frost heaving and stress analysis of a concrete structure of the section of a channel system building are realized, compared with the traditional analysis method, the analysis result is more accurate, the analysis result is according to representativeness, the guarantee is provided for the structural safety of the established channel section and smooth construction of a project to be built, and important reference and theoretical basis are provided for the prevention and treatment work of the frost heaving of the channel.
Description
Technical Field
The invention relates to the technical field of soil frost heaving analysis, in particular to an analysis method for influence of soil frost heaving on a concrete panel.
Background
Along with the rapid development of northwest regions in China, the number of canal engineering is increased, wherein the concrete faced rockfill dam is widely applied due to the advantages of high safety, good stability and simple construction, but canal construction in the frozen soil region is often damaged by freeze thawing cycle due to the influence of frozen soil, so that great potential safety hazards are caused to canal construction in cold regions, and in order to ensure the structural safety of established canal sections in canal engineering and smooth construction of to-be-constructed engineering, lining frost heaving and concrete faced structure stress analysis are required for the canal construction.
The frost heaving damage of the canal is formed by the expansion of the frozen volume of the canal foundation, jacking lining, and the expansion of the frozen volume of the canal foundation must have the following conditions: continuous negative temperature conditions in cold climates; free water and capillary water exist in the soil, and a clear water replenishing channel is formed; the surface of the weathered soil; the physical and mechanical properties of the soil include the granular composition of the soil, mineral compositions and the like. Among the above three conditions, the presence of free water and capillary water in the soil is a prerequisite for frost heaving to occur.
At present, the research on the influence of the frost heaving effect of the soil body on the concrete panel is less, but most of the existing analysis methods have complex and fussy flow, can not effectively simulate the cross section of the canal system building, can not accurately analyze the influence of the frost heaving effect of the soil body on the concrete panel, and therefore can not ensure the structural safety of the established canal section and smooth construction of the project to be built.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an analysis method for the influence of the frost heaving of the soil body on the concrete panel, which solves the problems that the existing analysis method for the influence of the frost heaving of the soil body is complex and tedious in flow, and can not effectively simulate the cross section of a canal system building, so that the influence of the frost heaving of the soil body on the concrete panel can not be accurately analyzed.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: an analysis method of influence of frost heaving of soil on a concrete panel comprises the following steps:
step one: firstly, selecting a typical section of a channel as an analysis sample, collecting frozen soil parameters of the section of the sample, respectively sampling frozen layers and unfrozen layers with different depths of the section of the sample, analyzing the water content of sampled soil to obtain the soil water content of the frozen layers and the unfrozen layers with different depths, and calculating the frost heaving rate of the soil according to the soil water content;
step two: firstly, surveying a channel typical section, acquiring a three-dimensional value of the channel typical section, drawing a channel typical section diagram according to the acquired three-dimensional value, carrying out three-dimensional numerical simulation according to the channel typical section diagram, establishing a three-dimensional geometric model of the channel, and carrying out grid subdivision on the three-dimensional geometric model to generate a finite element model;
step three: firstly, testing a concrete material of a typical section of a channel to obtain a density parameter, an elastic modulus parameter and a poisson ratio parameter of the concrete material as model calculation parameters, and setting the density parameter, the elastic modulus parameter and the poisson ratio parameter of the soil according to the soil property of the channel and the soil history data of the channel as calculation parameters of the model;
step four: firstly calculating the frost heaving quantity of a soil body of a typical section of a channel, then according to the calculated result of the frost heaving quantity, distributing the frost heaving quantity of the soil body along a slope frost heaving displacement of a clod surface canal into a plurality of sections of lines in a finite element model, applying the frost heaving quantity as a displacement load at a contact surface of the soil body and a concrete panel, applying structural constraint on a basic soil body, then gradually applying the displacement load in an ANSYS by adopting a displacement loading mode, and finally inputting calculation parameters into the finite element model and calculating a displacement field and a stress field of the concrete panel;
step five: and taking the calculated results of the displacement field and the stress field of the concrete panel as the load of the concrete panel, and analyzing the influence of the frost heaving of the soil body on the deformation and stress of the concrete panel, namely, whether the displacement of the soil body caused by the frost heaving causes the stress and deformation of the concrete panel to exceed the bearing capacity of the concrete panel.
The further improvement is that: in the first step, the collected frozen soil parameters comprise frozen soil data of the surface of the canal top and frozen soil data of a slope end, wherein the frozen soil data of the surface of the canal top is frozen thickness below the ground, and the frozen soil data of the slope end is frozen layer vertical slope thickness at different distances from the slope bottom of the canal bottom.
The further improvement is that: in the first step, the water content of the soil body is obtained from the water content of the soil body, and when the water content of the soil body is larger than the saturated water content, the frost heaving ratio calculation formula of the soil body is as follows:
η＝k*G*ω/(1+Gω)
wherein eta is the frost heaving ratio, omega is the water content of the soil body, k is the frost heaving ratio of water, k=9.07%, and G is the specific gravity of soil particles.
The further improvement is that: in the first step, when the water content of the soil body is between the initial frost heaving water content and the saturated water content, the frost heaving rate calculation formula of the soil body is as follows:
η＝(1+k)*ω*G/(1+e)-e/(1+e)
wherein e is the porosity of the soil body before frost heaving.
The further improvement is that: in the second step, a bottom plate, two side slope concrete panels, tooth grooves, a slope roof road and slope half joints are arranged in the three-dimensional geometric model of the channel, wherein the drain holes are not filled, the slope half joints are not filled with sealant, and the thickness of soil body below the two side slope concrete panels is twice the depth of the channel.
The further improvement is that: when the three-dimensional geometric model is split into grids, encrypted grids are adopted around slope concrete panels and tooth grooves on two sides of the three-dimensional geometric model, and the soil body part of the three-dimensional geometric model is split into grids with the size of 25-150 mm.
The further improvement is that: in the fourth step, the specific operation of applying structural constraint on the foundation soil body is as follows: and (3) applying fixed constraint on the bottom of the soil body, and applying constraint in the vertical river direction on the soil bodies at two sides.
The further improvement is that: in the fourth step, the frost heave amount is equal to the product of the frost heave rate and the frost heave depth, and the calculation formula is as follows:
ΔH＝η*H
wherein H is the depth of the frozen soil layer, and delta H is the frost heaving amount.
The beneficial effects of the invention are as follows: according to the invention, three-dimensional numerical simulation is carried out on a typical section of a channel, a finite element method is adopted, the frost heaving displacement of a channel soil body obtained by theoretical calculation is used as a concrete panel load, the influence of the frost heaving of the soil body on deformation and stress of the concrete panel is analyzed, accurate lining frost heaving and stress analysis of a concrete structure of the section of a channel system building are realized, compared with the traditional analysis method, the analysis result is more accurate, the analysis result is according to representativeness, the guarantee is provided for the structural safety of the established channel section and smooth construction of a project to be built, and important reference and theoretical basis are provided for the prevention and treatment work of the frost heaving of the channel.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic flow diagram of the method of the present invention;
FIG. 2 is a schematic representation of the three-dimensional geometric model structure of the present invention;
FIG. 3 is a schematic cross-sectional view of a three-dimensional geometric model mesh of the present invention;
FIG. 4 is a schematic representation of the freeze-swell distribution in an embodiment of 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. Based on the embodiments of the present invention, all other embodiments that can be obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
Referring to fig. 1, 2, 3 and 4, the embodiment provides a method for analyzing influence of frost heaving of a soil body on a concrete panel, which comprises the following steps:
step one: firstly, a typical section of a channel is selected as an analysis sample, frozen soil data of the surface of a canal top and frozen soil data of a slope end of the section of the sample are collected, wherein the frozen soil data of the surface of the canal top is frozen thickness below the ground, 0.3m below the ground is not frozen, the frozen soil data of the slope end is frozen layer vertical slope thickness at different distances from the slope foot of the canal bottom, wherein the frozen layer vertical slope thickness at the section 4.8-1.9 m from the slope foot of the canal bottom is 0.20-0.22 m, the frozen layer vertical slope thickness at the section 1.9-1.3 m from the slope foot of the canal bottom is 0.22-0.24 m, the frozen layer vertical slope thickness at the section 1.4-1.5 m from the slope foot of the canal bottom is the spreading width of a cohesive soil layer on the slope surface, the frozen layer vertical slope thickness at the section 1.3-0.6 m from the slope foot of the canal bottom is 0.24-0.30 m, respectively sampling frozen layers and unfrozen layers with different depths of sample sections, wherein 9 frozen layer sampling points are arranged on the right bank of a channel, 9 frozen layer sampling points are arranged (2/each group), 9 unfrozen layer sampling points are arranged on the lower part (2/each group), 7 frozen layer sampling points are arranged on the left bank, 1 sampling point is added on a viscous soil layer, 8 frozen layer sampling points are arranged (2/each group), water content test analysis is carried out on sampled soil bodies to obtain the water contents of the frozen layers and the unfrozen layers with different depths, the results are shown in the following table 1, then the frost heaving rate of the soil bodies is calculated according to the water content of the soil bodies, the water content of the soil bodies is obtained according to the water content of the soil bodies, when the water content of the soil bodies is smaller than the initial frost heaving water content, the soil bodies do not freeze heaving, and when the water content of the soil bodies is larger than the saturated water content, the frost heaving rate calculation formula of the soil bodies is
η＝k*G*ω/(1+Gω)
Wherein eta is the frost heaving rate, omega is the water content of the soil body, k is the frost heaving rate of water, k=9.07%, G is the specific gravity of soil particles, and when the water content of the soil body is between the initial frost heaving water content and the saturated water content, the calculation formula of the frost heaving rate of the soil body is generally between 2.6 and 2.7
η＝(1+k)*ω*G/(1+e)-e/(1+e)
Wherein e is the void ratio of the soil body before frost heaving;
step two: firstly, surveying a channel typical section, acquiring a three-dimensional numerical value of the channel typical section, drawing a channel typical section diagram according to the acquired three-dimensional numerical value, carrying out three-dimensional numerical simulation according to the channel typical section diagram, establishing a three-dimensional geometric model of the channel, wherein the three-dimensional geometric model comprises a channel bottom plate (with a drain hole), slope concrete panels on two sides of the channel (with a drain hole), channel tooth grooves, channel slope top roads and channel slope half seams, the drain hole is not filled, the slope half seams are not filled with sealant, the thickness of the concrete panels is 50mm, the thickness of soil body below the slope concrete panels on two sides is twice the depth of the channel, the width of the model along the water flow direction (Z direction) is 3.98m, then carrying out grid subdivision on the three-dimensional geometric model, generating a finite element model, carrying out grid subdivision on the soil body part of the three-dimensional geometric model by adopting encrypted grids around the slope concrete panels and the tooth grooves, and setting the maximum grid subdivision size to be 150mm;
step three: firstly, testing concrete materials of typical sections of channels to obtain density parameters 2400kg/m of the concrete materials 3 The elastic modulus parameter 28GPa and the Poisson's ratio parameter 0.167 are taken as model calculation parameters, and then the density parameter 1300kg/m of the soil is set according to the soil property of the channel and the soil history data of the channel 3 Taking the parameters of the elastic modulus parameter 50Mpa and the poisson ratio 0.3 as the calculation parameters of the model;
step four: firstly, calculating the frost heaving quantity of a soil body of a typical section of a channel, then according to the calculated result of the frost heaving quantity, the frost heaving quantity distribution is shown as a figure 4, the frost heaving displacement of the soil body along a slope of a clod surface channel is distributed as a multi-section line in a finite element model, the frost heaving quantity is applied to the contact surface of the soil body and a concrete panel as a displacement load, then the bottom of the soil body is applied with fixed constraint, the soil bodies at two sides are applied with constraint in the vertical river direction, then the displacement load is gradually applied in an ANSYS by adopting a displacement loading mode, finally, the calculated parameters are input into the finite element model, the displacement field and the stress field of the concrete panel are calculated, the frost heaving quantity is equal to the product of the frost heaving rate and the frost heaving depth, and the calculation formula is as follows:
ΔH＝η*H
wherein H is the depth of a frozen soil layer, and delta H is the frost heaving amount;
according to relevant regulations of "engineering anti-frost-heave design specification (SL 23-2006)", the maximum annual freezing depth should be the maximum annual freezing depth value of the adjacent weather stations (stations) where the engineering is located or where the air temperature conditions are similar, and the statistical data series should not be shorter than 20 years, so the maximum annual freezing depth is 18cm, which is calculated and selected for meeting the requirements of the specification according to the embodiment, and the calculation formula of the design frost-heave in the specification is as follows:
Z d ＝ψ d *ψ w *Z m
wherein, psi is d ＝α+(1-α)*ψ i ，Z d Design depth of freezing (cm) for canal engineering, Z m Taking the maximum freezing depth (cm) of the unsealed area as 18cm, psi as the maximum freezing depth (cm) of the past year d To consider the correction factors for sunlight and shade conditions, ψ w For groundwater influence coefficients, a is the calculated coefficient, ψ i A correction coefficient for sunlight and shading of a certain part of the area where the project is located;
the water content of the typical section soil layer is between the initial frost-heaving water content and the saturated water content, and the calculation results are shown in the following table 2;
step five: and taking the calculated results of the displacement field and the stress field of the concrete panel as the load of the concrete panel, and analyzing the influence of the frost heaving of the soil body on the deformation and stress of the concrete panel, namely, whether the displacement of the soil body caused by the frost heaving causes the stress and deformation of the concrete panel to exceed the bearing capacity of the concrete panel.
TABLE 1
TABLE 2
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The method for analyzing the influence of the frost heaving of the soil body on the concrete panel is characterized by comprising the following steps of:
step one: firstly, selecting a typical section of a channel as an analysis sample, collecting frozen soil parameters of the section of the sample, respectively sampling frozen layers and unfrozen layers with different depths of the section of the sample, analyzing the water content of sampled soil to obtain the soil water content of the frozen layers and the unfrozen layers with different depths, and calculating the frost heaving rate of the soil according to the soil water content;
step two: firstly, surveying a channel typical section, acquiring a three-dimensional value of the channel typical section, drawing a channel typical section diagram according to the acquired three-dimensional value, carrying out three-dimensional numerical simulation according to the channel typical section diagram, establishing a three-dimensional geometric model of the channel, and carrying out grid subdivision on the three-dimensional geometric model to generate a finite element model;
step three: firstly, testing a concrete material of a typical section of a channel to obtain a density parameter, an elastic modulus parameter and a poisson ratio parameter of the concrete material as model calculation parameters, and setting the density parameter, the elastic modulus parameter and the poisson ratio parameter of the soil according to the soil property of the channel and the soil history data of the channel as calculation parameters of the model;
step four: firstly calculating the frost heaving quantity of a soil body of a typical section of a channel, then according to the calculated result of the frost heaving quantity, distributing the frost heaving quantity of the soil body along a slope frost heaving displacement of a clod surface canal into a plurality of sections of lines in a finite element model, applying the frost heaving quantity as a displacement load at a contact surface of the soil body and a concrete panel, applying structural constraint on a basic soil body, then gradually applying the displacement load in an ANSYS by adopting a displacement loading mode, and finally inputting calculation parameters into the finite element model and calculating a displacement field and a stress field of the concrete panel;
step five: and taking the calculated results of the displacement field and the stress field of the concrete panel as the load of the concrete panel, and analyzing the influence of the frost heaving of the soil body on the deformation and stress of the concrete panel, namely, whether the displacement of the soil body caused by the frost heaving causes the stress and deformation of the concrete panel to exceed the bearing capacity of the concrete panel.
2. The method for analyzing the influence of frost heaving of a soil body on a concrete panel according to claim 1, wherein the method comprises the following steps: in the first step, the collected frozen soil parameters comprise frozen soil data of the surface of the canal top and frozen soil data of a slope end, wherein the frozen soil data of the surface of the canal top is frozen thickness below the ground, and the frozen soil data of the slope end is frozen layer vertical slope thickness at different distances from the slope bottom of the canal bottom.
3. The method for analyzing the influence of frost heaving of a soil body on a concrete panel according to claim 1, wherein the method comprises the following steps: in the first step, the water content of the soil body is obtained from the water content of the soil body, and when the water content of the soil body is larger than the saturated water content, the frost heaving ratio calculation formula of the soil body is as follows:
η＝k*G*ω/(1+Gω)
wherein eta is the frost heaving ratio, omega is the water content of the soil body, k is the frost heaving ratio of water, k=9.07%, and G is the specific gravity of soil particles.
4. The method for analyzing the influence of frost heaving of a soil body on a concrete panel according to claim 1, wherein the method comprises the following steps: in the first step, when the water content of the soil body is between the initial frost heaving water content and the saturated water content, the frost heaving rate calculation formula of the soil body is as follows:
η＝(1+k)*ω*G/(1+e)-e/(1+e)
wherein e is the porosity of the soil body before frost heaving.
5. The method for analyzing the influence of frost heaving of a soil body on a concrete panel according to claim 1, wherein the method comprises the following steps: in the second step, a bottom plate, two side slope concrete panels, tooth grooves, a slope roof road and slope half joints are arranged in the three-dimensional geometric model of the channel, wherein the drain holes are not filled, the slope half joints are not filled with sealant, and the thickness of soil body below the two side slope concrete panels is twice the depth of the channel.
6. The method for analyzing the influence of frost heaving of a soil body on a concrete panel according to claim 5, wherein the method comprises the following steps: when the three-dimensional geometric model is split into grids, encrypted grids are adopted around slope concrete panels and tooth grooves on two sides of the three-dimensional geometric model, and the soil body part of the three-dimensional geometric model is split into grids with the size of 25-150 mm.
7. The method for analyzing the influence of frost heaving of a soil body on a concrete panel according to claim 1, wherein the method comprises the following steps: in the fourth step, the specific operation of applying structural constraint on the foundation soil body is as follows: and (3) applying fixed constraint on the bottom of the soil body, and applying constraint in the vertical river direction on the soil bodies at two sides.
8. The method for analyzing the influence of frost heaving of a soil body on a concrete panel according to claim 1, wherein the method comprises the following steps: in the fourth step, the frost heave amount is equal to the product of the frost heave rate and the frost heave depth, and the calculation formula is as follows:
ΔH＝η*H
wherein H is the depth of the frozen soil layer, and delta H is the frost heaving amount.
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| 杜君 ; 刘庆福 ; 曹振宇 ; .必须重视渠道防渗的冻胀问题.黑龙江水利科技.2007,(06),全文. * |
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