CN109299573B - Optimization method for setting slope angle of sponge rainwater - Google Patents
Optimization method for setting slope angle of sponge rainwater Download PDFInfo
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Abstract
The invention discloses a method for optimizing a slope angle of a sponge rainwater facility, which can simulate the saturated water content and the saturated permeability coefficient of different materials through Geostudio software to obtain a soil-water characteristic curve and a permeability coefficient function, and then combine a constitutive model and input physical and mechanical parameters related to the materials to obtain the optimal slope angle of the side slope of a bioretention facility.
Description
Technical Field
The invention belongs to the field of slope angle optimization, and particularly relates to a method for optimizing a slope angle of a sponge rainwater facility.
Background
The sponge city is mainly constructed by utilizing objective water resource-rainwater, draining water by utilizing natural force and gradually improving the water pollution problem through natural purification capacity. From the moisture characteristics of the sponge, it can be simply understood that: the city can be like the sponge, let the rainwater in the utilization and the migration in-process in city, more "convenience". Further understanding can be realized, it is believed that in the rainfall process, rainwater can be accumulated through absorption, regulation, infiltration, treatment, purification and other modes, and stored water is released when waiting for needs, so as to irrigate, flush the road surface, supplement landscape water bodies and underground water and the like.
In the process of sponge city construction, the bioretention facility becomes one of the most widely applied low-impact development technologies on urban municipal roads due to the efficient rainwater natural purification and treatment characteristics. The bioretention facility has unique function as a facility for controlling rainfall runoff taking seepage, stagnation and purification as main functions in a sponge city system. The method plays a certain role in reducing the local initial rainfall flood peak and the total runoff amount. The slope of the biological detention facility also influences the volume of water flow detention and the speed of runoff reduction to a certain extent. Design a reasonable slope, both can satisfy the biological facility regulation volume requirement of detaining, can also make simultaneously and detain the facility more fast in a certain period and absorb the rainwater, better reduction road runoff.
With the development of computers, the finite element analysis technology has been developed and the finite element analysis software has been widely applied. Geostudio is a set of professional, efficient and powerful simulation analysis and design software suitable for geotechnical engineering and geotechnical environment simulation calculation.
Disclosure of Invention
The invention aims to overcome the defects and provides an optimization method for setting a slope angle of sponge rainwater, which simulates the influence of the retention volume of a detention facility and rainwater infiltration on buildings and municipal roads around the bioretention facility under different rainfall conditions at different slope angles.
In order to achieve the above object, the present invention comprises the steps of:
setting an analysis type by adopting Geostudio software, firstly performing steady state analysis, then selecting stress strain in-situ analysis as a subitem by taking the steady state analysis as a female parent, establishing coupled stress/pore water pressure analysis by taking an initial pore water pressure situation from a superior catalog, and setting time and an analysis step required by analysis problems;
step two, carrying out finite element modeling according to the actual sizes of the bioretention facilities and surrounding buildings or roads, drawing areas, dividing grids, and paving anti-seepage films on the side surfaces and the bottoms of the bioretention facilities;
thirdly, obtaining a soil-water characteristic curve and a permeability coefficient function of the material according to the saturated water content and the saturated permeability coefficient of different materials through Geostudio software, selecting different constitutive models according to soil properties in a stress-strain calculation module, and inputting relevant physical and mechanical parameters of the material;
setting boundary conditions in the Geostudio software to simulate accumulated water with different heights;
running a solving program in Geostudio software, assembling soil attribute and geometric information at the Gaussian point of each unit by a solver, and applying the soil attribute and geometric information to a seepage equation and a displacement equation of each node for calculation;
step six, after checking the calculation result, changing the side slope of the bioretention facility, and repeatedly performing finite element calculation and solving;
and step seven, obtaining the optimal slope angle according to the solving result of the step six.
The analysis type is set by adopting a sep/w module and a sigma/w module of Geostudio software.
In the first step, when the coupled stress/pore water pressure analysis is established, the method is characterized in that an analysis step is established according to the time of the analyzed problem in the transient analysis.
The bioretention facility comprises foundation soil, planting soil, replacement and filling soil, a gravel layer and an impermeable membrane with different material attributes, wherein the foundation soil, the planting soil and the replacement and filling soil are respectively simulated by saturated/unsaturated silty clay and silt, the gravel is simulated by a saturated material model, the saturated water content and the saturated permeability coefficient of the gravel layer are input, and the impermeable membrane is simulated by a watertight interface material.
Step six, when checking the calculation result, the flow of a certain section can be checked, and the size of the retained rainwater in the retained facility within a certain time is calculated by comparing the difference values of the flows at different times; in the coupling stress-strain analysis, the water content change of the soil body and the displacement change of the road surface under each working condition can be checked.
And seventhly, under different slope angles, comparing and analyzing the water storage capacity of the bioretention facilities at the same time and the influence of the infiltrated rainwater on the water content of the foundation soil and the deformation of surrounding roads or buildings, and selecting the optimal slope angle by combining the water storage capacity under the condition of not influencing the normal operation of the roads and the buildings.
Compared with the prior art, the method can simulate the saturated water content and the saturated permeability coefficient of different materials through Geostodio software to obtain a soil-water characteristic curve and a permeability coefficient function, and then combine a constitutive model and input physical and mechanical parameters related to the materials to obtain the optimal slope angle of the side slope of the bioretention facility.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the invention specifically takes the infiltration type bioretention facilities on the municipal road as an example, and the method of the invention is adopted to evaluate the optimal slope angle by observing the influence of the rainwater infiltration type bioretention facilities on the municipal road subgrade and the foundation soil under different working conditions. The method specifically comprises the following steps:
step one, starting a sep/w module of the software Geostudio, and setting an analysis type. The first step is selected as steady state analysis, then the steady state analysis is used as a parent, the stress strain in-situ analysis is selected as a child item, and the initial pore water pressure situation comes from a superior catalog. The worst time for accumulating water in the bioretention facility is 72h, so that the analysis time is set to be 72h in the next coupling analysis, the analysis steps are 360 steps, and the analysis steps are increased in a linear mode;
and step two, carrying out finite element modeling according to the actual sizes of the municipal road and the bioretention facility, wherein the width of each of the roads on the two sides of the bioretention facility is 16m and 8m. The upper part of the bioretention facility is 3m wide and 1.23m deep. Drawing regions and dividing grids;
inputting materials, wherein the bioretention facility comprises planting soil, replacement filling soil, a gravel layer and an impermeable membrane with different material attributes, the foundation soil, the planting soil and the replacement filling soil are respectively simulated by adopting saturated/unsaturated silty clay and silt, and the saturated water content and the saturated permeability coefficient of each layer of soil body are input by using a method of software built-in typical material estimation to obtain a corresponding soil-water characteristic curve and a permeability coefficient function; because the permeability coefficient of the gravel is very large, a saturated material model can be adopted for simulation, and only the saturated water content and the saturated permeability coefficient of the gravel layer need to be input. The impermeable membrane is simulated by a water impermeable interface material;
step four, setting boundary conditions. In the steady state analysis, the underground water level is set to be 13m below the road surface, and the water content distribution of the foundation field in the initial state is obtained. In the in-situ analysis, the left and right boundaries of the model are set to apply X-direction constraint, and the bottom is fixed constraint. In the coupling analysis, the most unfavorable rainfall condition, namely the height of the accumulated water at the upper part of the detention facility is 20cm, is selected as a rainfall boundary in the embodiment;
step five, the working condition setting, the analysis prevention of seepage membrane laying condition divide into 4 kinds of working conditions in this embodiment: aspect ratio 1, aspect ratio 0.6, aspect ratio 1;
step six, running a program, checking steady-state analysis, transient analysis and coupling stress strain calculation in a solving manager window, and starting calculation;
and step seven, checking a calculation result, checking the flow of a certain section in the seepage analysis, and calculating the amount of the retained rainwater in the retained facility within a certain time by comparing the difference values of the flows at different times. In the coupling stress-strain analysis, the water content change of the soil body and the displacement change of the road surface under each working condition can be checked. Through contrasting relevant standard, the most economic reasonable angle of hilling is selected to the water content and the displacement change condition of road bed and foundation soil when contrasting different angle of hilling under the prerequisite that satisfies the standard requirement.
Claims (6)
1. An optimization method for setting a slope angle for sponge rainwater is characterized by comprising the following steps:
setting an analysis type by adopting Geostudio software, firstly performing steady state analysis, then selecting stress strain in-situ analysis as a subitem by taking the steady state analysis as a female parent, establishing coupled stress/pore water pressure analysis by taking an initial pore water pressure situation from a superior catalog, and setting time and an analysis step required by analysis problems;
step two, carrying out finite element modeling according to the actual sizes of the bioretention facilities and surrounding buildings or roads, drawing areas, dividing grids, and paving anti-seepage films on the side surfaces and the bottoms of the bioretention facilities;
thirdly, obtaining a soil-water characteristic curve and a permeability coefficient function of the material according to the saturated water content and the saturated permeability coefficient of different materials through Geostudio software, selecting different constitutive models according to soil properties in a stress-strain calculation module, and inputting relevant physical and mechanical parameters of the material;
setting boundary conditions in the Geostudio software to simulate accumulated water with different heights;
running a solving program in Geostudio software, assembling soil attribute and geometric information at the Gaussian point of each unit by a solver, and applying the soil attribute and geometric information to a seepage equation and a displacement equation of each node for calculation;
step six, after checking the calculation result, changing the side slope of the bioretention facility, and repeatedly carrying out finite element calculation solving;
and step seven, obtaining the optimal slope angle according to the solving result of the step six.
2. The optimization method for setting the release slope angle for the sponge rainwater as claimed in claim 1, wherein analysis types are set by adopting a sep/w module and a sigma/w module of Geostudio software.
3. The method for optimizing the setting and releasing slope angle of the sponge rainwater as claimed in claim 1, wherein in the step one, when the coupled stress/pore water pressure analysis is established, the method is characterized in that in the transient analysis, an analysis step is established according to the time of an analyzed problem.
4. The method for optimizing the slope angle for setting and discharging sponge rainwater as claimed in claim 1, wherein the bioretention facility comprises foundation soil, planting soil, replacement and filling soil, a gravel layer and an impermeable membrane with different material properties, wherein the foundation soil, the planting soil and the replacement and filling soil are respectively simulated by saturated/unsaturated silty clay and silt, the gravel is simulated by a saturated material model, the saturated water content and the saturated permeability coefficient of the gravel layer are input, and the impermeable membrane is simulated by a water-impermeable interface material.
5. The optimization method for setting the release slope angle of the sponge rainwater as claimed in claim 1, wherein in the sixth step, when checking the calculation result, the flow of a certain section can be checked, and the size of the amount of rainwater retained in the retained facility within a certain time is calculated by comparing the difference values of the flow at different times; in the coupling stress-strain analysis, the water content change of the soil body and the displacement change of the road surface under each working condition can be checked.
6. The optimization method for setting the slope angle for discharging the sponge rainwater as claimed in claim 1, wherein in the seventh step, under the condition of different slope angles through comparative analysis, the water storage capacity of the bioretention facilities and the influence of rainwater infiltration on the water content of the foundation soil and the deformation of surrounding roads or buildings are determined at the same time, and under the condition of not influencing the normal operation of the roads and the buildings, the optimal slope angle is selected according to the water storage capacity.
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| JP2005307707A (en) * | 2004-04-16 | 2005-11-04 | Usui Chiyoriyuu Shinto Gijutsu Kyokai | Construction method for natural circulation road |
| CN106202980A (en) * | 2016-08-24 | 2016-12-07 | 山西省交通科学研究院 | A kind of swelled ground is humidified under Condition of Rainfall Infiltration and expands method for numerical simulation |
| CN106759825A (en) * | 2016-12-14 | 2017-05-31 | 浙江建设职业技术学院 | A kind of construction method of sponge urban green space water storage system |
| IT201600073319A1 (en) * | 2016-07-13 | 2018-01-13 | Univ Della Calabria | SYSTEM AND METHOD OF CALCULATION OF HYDROGEOLOGICAL RISK |
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Patent Citations (4)
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|---|---|---|---|---|
| JP2005307707A (en) * | 2004-04-16 | 2005-11-04 | Usui Chiyoriyuu Shinto Gijutsu Kyokai | Construction method for natural circulation road |
| IT201600073319A1 (en) * | 2016-07-13 | 2018-01-13 | Univ Della Calabria | SYSTEM AND METHOD OF CALCULATION OF HYDROGEOLOGICAL RISK |
| CN106202980A (en) * | 2016-08-24 | 2016-12-07 | 山西省交通科学研究院 | A kind of swelled ground is humidified under Condition of Rainfall Infiltration and expands method for numerical simulation |
| CN106759825A (en) * | 2016-12-14 | 2017-05-31 | 浙江建设职业技术学院 | A kind of construction method of sponge urban green space water storage system |
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| 基于物理试验生物滞留沟对海绵城市路基水分场分布;龚华凤等;《科学技术与工程》;20180728(第21期);全文 * |
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