CN114150683B - Arrangement method of pressure relief device on bottom plate of basement in sloping field - Google Patents

Arrangement method of pressure relief device on bottom plate of basement in sloping field Download PDF

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CN114150683B
CN114150683B CN202111501447.3A CN202111501447A CN114150683B CN 114150683 B CN114150683 B CN 114150683B CN 202111501447 A CN202111501447 A CN 202111501447A CN 114150683 B CN114150683 B CN 114150683B
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pressure relief
water
bottom plate
relief device
slope
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CN114150683A (en
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林拥军
方言
张曾鹏
余国菲
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Southwest Jiaotong University
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/10—Restraining of underground water by lowering level of ground water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
    • E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/60—Planning or developing urban green infrastructure

Abstract

The invention discloses a method for arranging a pressure relief device on a basement bottom plate of a sloping field, which comprises the following steps: s1, calculating a bottom side water head of the bottom plate slope; s2, calculating the length of the bearing section according to the bottom side water head of the bottom plate slope; s3, calculating the worst section water head of the bottom plate according to the length of the bearing segment; s4, calculating the displacement of a single pressure relief device according to the worst section water head of the bottom plate and the influence radius of the single pressure relief device; s5, obtaining the positions and the number of the pressure relief devices on the bottom plate of the slope bottom basement according to the drainage of the single pressure relief device, and realizing the arrangement of the pressure relief devices; the invention solves the problem that the method for reasonably determining the number and the positions of the pressure relief devices according to rainfall parameters, soil body characteristics and self structural parameters of the bottom plate is lacked in the prior art.

Description

Arrangement method of pressure relief device on bottom plate of basement in sloping field
Technical Field
The invention relates to the technical field of buildings, in particular to a method for arranging a pressure relief device on a basement bottom plate of a sloping field.
Background
Aiming at the safety problem of basement bottom plate anti-floating, a pressure relief device with active anti-floating, water pressure sensing and buoyancy dynamic adjusting functions is provided at present, the application number is CN201921502132.9, the pressure relief device disclosed by the patent is provided with an inclined bottom plate for the basement of the sloping field in the area with abundant rainfall, the water buoyancy borne by the inclined bottom plate is in non-uniform distribution characteristic, the distribution of the water head of underground water is complex, and the water pressure sensing and drainage timeliness characteristic of the pressure relief device has better applicability to the anti-floating pressure relief of the bottom plate. However, how to reasonably determine the number and the positions of the pressure relief devices according to rainfall parameters, soil body characteristics, structural parameters of the bottom plate and the like and establish an arrangement method of the pressure relief devices of the bottom plate of the basement in the sloping field so as to ensure the anti-floating safety of the bottom plate is a problem which needs to be solved urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the method for arranging the pressure relief devices on the bottom plate of the basement in the sloping field solves the problem that a method for reasonably determining the number and the positions of the pressure relief devices according to rainfall parameters, soil body characteristics and self structural parameters of the bottom plate is lacked in the prior art.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a method for arranging a pressure relief device on a bottom plate of a basement on a sloping field comprises the following steps:
s1, calculating a bottom side water head of the bottom plate slope;
s2, calculating the length of the bearing section according to the bottom side water head of the bottom plate slope;
s3, calculating the worst section water head of the bottom plate according to the length of the bearing segment;
s4, calculating the water discharge of a single pressure relief device according to the worst section water head of the bottom plate and the influence radius of the single pressure relief device;
and S5, obtaining the positions and the number of the pressure relief devices on the bottom plate of the slope bottom basement according to the drainage of the single pressure relief device, and realizing the arrangement of the pressure relief devices.
Further, the step S1 includes the following sub-steps:
s11, calculating the rainstorm intensity of the target site;
s12, calculating the bottom side water head strength of the bottom slope according to the rainstorm strength and the runoff coefficient of the target site;
and S13, calculating the bottom side water head of the bottom slope according to the bottom side water head strength of the bottom slope.
Further, the formula for calculating the rainstorm intensity of the target site in the step S11 is as follows:
Figure BDA0003401804470000021
wherein q is the rainstorm intensity of the target site, t is the rainfall time of the target site, A1The rainfall parameter is a rainfall parameter, C is a rainfall variation parameter, b is a rainfall duration correction parameter, m is a rainstorm attenuation index, and P is a rainstorm reappearance period of a target site.
Further, the formula for calculating the water head strength at the bottom side of the bottom slope in the step S12 is as follows:
Hq2＝(1+ψ)q
wherein Hq2The bottom side water head strength of the bottom slope is psi, the runoff coefficient is phi, and the runoffThe coefficient is obtained according to the building density of the target site, and q is the rainstorm intensity of the target site.
Further, the formula for calculating the water head at the bottom side of the bottom slope in the step S13 is as follows:
Figure BDA0003401804470000022
wherein H2Is the bottom side water head of the bottom plate slope Hq2The bottom side water head strength of the bottom slope of the bottom plate, t the rainfall time of the target site,
Figure BDA0003401804470000023
is the initial value of the water head at the bottom slope side of the bottom plate.
The beneficial effects of the above further scheme are: and calculating to obtain the height of the accumulated water head of the slope bottom of the basement in the rainstorm period, namely the maximum height of the water head borne by the bottom plate of the basement.
Further, the formula for calculating the length of the pressure-bearing section in step S2 is as follows:
Figure BDA0003401804470000031
Figure BDA0003401804470000032
Figure BDA0003401804470000033
Figure BDA0003401804470000034
wherein H1The initial value of the water head of the junction position of the diving water, the confined water and the bottom plate at the lower part of the bottom plate of the basement is H1Is the ground water level on the top side of the bottom plate slope, s1The thickness of the water-bearing layer on the top side of the bottom plate slope, s2Is a bottom plate slope bottomThickness of side water-containing layer, H2Is the bottom side water head of the bottom slope, Q is the initial value of the interface seepage quantity of the diving and the confined water at the lower part of the basement bottom plate, k is the water permeability coefficient of the aquifer, T2The distance from the top of the slope bottom side to the bottom of the aquifer,
Figure BDA0003401804470000035
the corrected value of the water head of the junction position of the diving water at the lower part of the basement bottom plate, the pressure-bearing water and the bottom plate is2The initial length of the pressure-bearing section of the basement floor area, l is the horizontal projection length of the basement floor area,
Figure BDA0003401804470000036
and the corrected value is the length of the pressure-bearing section of the basement bottom plate area.
The beneficial effects of the above further scheme are: the length of the bearing section of the basement bottom plate area can be obtained by calculating the water head of the junction position of the diving water, the bearing water and the bottom plate at the lower part of the basement bottom plate, so that the range of the anti-floating design of the basement bottom plate is determined.
Further, the formula for calculating the worst section water head of the bottom plate in the step S3 is as follows:
Figure BDA0003401804470000037
Figure BDA0003401804470000038
Figure BDA0003401804470000039
Figure BDA00034018044700000310
wherein ξoThe resistance coefficient, xi, of the basement bottom plate pressure-bearing area inlet sectionvFor basement bottom plate bearingVertical section drag coefficient inside the pressure zone, s2The thickness of the water-bearing layer on the slope bottom side of the bottom plate T2The distance from the top of the slope bottom side to the bottom of the aquifer, k is the water permeability coefficient of the aquifer, H2Is a water head at the bottom side of the bottom plate slope,
Figure BDA0003401804470000041
is a corrected value of the length of the pressure-bearing section of the basement bottom plate area,
Figure BDA0003401804470000042
the water head correction value of the junction position of the diving water at the lower part of the basement bottom plate, the pressure-bearing water and the bottom plate,
Figure BDA0003401804470000046
the corrected value of the interface seepage flow of the diving water and the pressure-bearing water at the lower part of the basement bottom plate,
Figure BDA0003401804470000043
the worst cross-sectional head of the floor.
The beneficial effects of the above further scheme are: the most unfavorable cross-section flood peak of bottom plate is as the anti flood peak of pressure relief device's of design to guarantee that basement bottom plate optional position is anti to float safety.
Further, the step S4 includes the following sub-steps:
s41, calculating the influence radius R of a single pressure relief device according to the principle of symmetrically arranging the pressure relief devices;
s42, using the middle point position of the overlapping part of the influence radius R of the single pressure relief device as a control point, and calculating the water discharge Q of the single pressure relief device meeting the water head deepening of the control point based on the water head deepening of the middle point of the pressure relief device groupw；
S43 discharge Q of single pressure relief device meeting water head depth reduction of control pointwCalculating the required depth d of a single pressure relief devicew；
S44, depth reduction d according to requirement of single pressure relief devicewCalculating the radius R of influence of the pressure water on the initial moment of the single pressure relief device0；
S45 screeningRadius of influence R of confined water at initial moment0And a single pressure relief device affects a larger value between radii R
Figure BDA0003401804470000044
S46, in order to ensure that the initial time and the stable drainage period of the pressure relief device meet the pressure relief requirement of the bottom plate, the pressure relief device is used according to a larger value
Figure BDA0003401804470000045
The displacement of a single pressure relief device is recalculated.
The beneficial effects of the above further scheme are: the maximum water head depth reduction required by the pressure relief device at the initial moment and in the stable drainage period is selected as the designed water head depth reduction value of the pressure relief device, so that the safety of the bottom plate in the whole pressure relief period can be ensured.
Further, the formula for calculating the influence radius R of the single pressure relief device in step S41 is as follows:
Figure BDA0003401804470000051
wherein k is the water permeability coefficient of the aquifer, s is the thickness of the aquifer in the basement floor area, twDrainage time, μ for a single pressure relief device*Water storage coefficient of a water-containing layer in a basement bottom plate area;
in the step S42, calculating the water discharge Q of the single pressure relief device meeting the water head deepening requirement of the control pointwThe formula of (1) is:
Figure BDA0003401804470000052
Figure BDA0003401804470000053
Figure BDA0003401804470000054
wherein T is the water guide coefficient of the aquifer in the basement floor area, dmThe depth of the basement is required to be reduced by the worst cross section of the floating bottom plate, n is the number of the pressure relief devices participating in drainage work, R is the influence radius of a single pressure relief device,
Figure BDA0003401804470000055
the equivalent distance r from all pressure relief devices participating in drainage to the middle point i of the overlapped part of the influence radius of the adjacent pressure relief devices on the basement bottom plate isinThe distance from n to i point of a certain pressure relief device participating in the drainage work,
Figure BDA0003401804470000056
the most unfavorable cross-sectional head of the floor, s2The thickness of the water-bearing layer at the slope bottom side of the bottom plate is h, and the self anti-floating water head of the bottom plate is h.
Further, the required depth d of the single pressure relief device is calculated in the step S43wThe formula of (1) is:
Figure BDA0003401804470000057
wherein T is the water guide coefficient of the aquifer in the basement bottom plate area, R is the radius influenced by a single pressure relief device, and QwFor a single pressure relief device displacement, r, for meeting the control point head fallwThe radius of a self water outlet of the pressure relief device;
in step S44, the radius R of influence of the confined water at the initial time of the single pressure relief device0The formula of (1) is:
Figure BDA0003401804470000061
wherein, dwThe depth required by a single pressure relief device is reduced, and k is the water permeability coefficient of the aquifer;
the formula for recalculating the displacement of a single pressure relief device in step S46 is as follows:
Figure BDA0003401804470000062
Figure BDA0003401804470000063
wherein the content of the first and second substances,
Figure BDA0003401804470000064
the water discharge amount finally required by a single pressure relief device, T is the water guide coefficient of the aquifer in the basement floor area,
Figure BDA0003401804470000065
the final required depth reduction correction value of a single pressure relief device, R is the influence radius of the single pressure relief device, RwThe radius of the self water outlet of the pressure relief device,
Figure BDA0003401804470000066
influencing the radius R for the initial moment0And a single pressure relief device influences the larger value between the radius R and the radius R, and k is the water permeability coefficient of the aquifer.
In conclusion, the beneficial effects of the invention are as follows:
aiming at the characteristic that the underground water head of the sloping field is reduced along the slope top direction in a monotonous mode, the anti-floating measure is arranged at the worst position of the underground structure, the anti-floating design is not needed to be carried out on the rest positions of the bottom plate, and the buoyancy design area and the engineering cost of the bottom plate are reduced. In the calculation of each technical index of the pressure relief device, the influence of specific factors such as rainfall intensity, surface runoff and the like on anti-floating measures is considered, so that the pressure relief device can develop anti-floating design of an underground structure according to local conditions under different geological meteorological conditions, structural strength and field surrounding environments.
Drawings
Fig. 1 is a flow chart of a method for arranging a pressure relief device on a bottom plate of a basement in a sloping field.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, a method for arranging a pressure relief device on a bottom plate of a basement in a sloping field comprises the following steps:
s1, calculating a bottom side water head of the bottom plate slope;
step S1 includes the following substeps:
s11, calculating the rainstorm intensity of the target site;
the formula for calculating the rainstorm intensity of the target site in step S11 is:
Figure BDA0003401804470000071
wherein q is the rainstorm intensity of the target site, t is the rainfall time of the target site, A1The rainstorm attenuation index m is calculated and determined according to mathematical statistics or an analysis method in appendix A of outdoor drainage design Specification (GBGB50014-2016), and P is a rainstorm reappearance period of a target site.
S12, calculating the bottom side water head strength of the bottom slope according to the rainstorm strength and the runoff coefficient of the target site;
the formula for calculating the bottom side water head strength of the bottom slope in the step S12 is as follows:
Hq2＝(1+ψ)q
wherein Hq2The strength of the bottom side water head of the bottom slope is psi, the runoff coefficient is obtained by selecting according to the building density of the target site, and q is the rainstorm strength of the target site.
And S13, calculating the bottom side water head of the bottom slope according to the bottom side water head strength of the bottom slope.
In step S13, the formula for calculating the bottom side water head of the bottom slope is:
Figure BDA0003401804470000072
wherein H2Is the bottom side water head of the bottom plate slope Hq2The bottom side water head strength of the bottom slope of the bottom plate, t the rainfall time of the target site,
Figure BDA0003401804470000073
the initial value of the water head at the bottom slope side of the bottom plate is obtained.
S2, calculating the length of the bearing section according to the bottom side water head of the bottom plate slope;
the formula for calculating the length of the pressure-bearing segment in the step S2 is as follows:
Figure BDA0003401804470000081
Figure BDA0003401804470000082
Figure BDA0003401804470000083
Figure BDA0003401804470000084
wherein HtThe initial value of the water head of the junction position of the diving water, the confined water and the bottom plate at the lower part of the bottom plate of the basement is H1Is the ground water level on the top side of the bottom plate slope, s1The thickness of the water-bearing layer on the top side of the bottom plate slope is s2The thickness of the water-bearing layer on the bottom slope side of the bottom plate H2Is the bottom side water head of the bottom slope, Q is the initial value of the interface seepage quantity of the diving and the confined water at the lower part of the basement bottom plate, k is the water permeability coefficient of the aquifer, T2The distance from the top of the slope bottom side to the bottom of the aquifer,
Figure BDA0003401804470000085
the corrected value of the water head of the junction position of the diving water at the lower part of the basement bottom plate, the pressure-bearing water and the bottom plate is2Is the initial length of the basement bottom plate zone pressure-bearing section, l is the horizontal projection length of the basement bottom plate zone bottom plate,
Figure BDA0003401804470000086
and the corrected value is the length of the pressure-bearing section of the basement bottom plate area.
S3, calculating the worst section water head of the bottom plate according to the length of the bearing segment;
the formula for calculating the worst section head of the floor in step S3 is:
Figure BDA0003401804470000087
Figure BDA0003401804470000088
Figure BDA0003401804470000089
Figure BDA00034018044700000810
wherein ξoThe resistance coefficient, xi, of the basement bottom plate pressure-bearing area inlet sectionvIs the resistance coefficient of the vertical section inside the pressure-bearing area of the basement bottom plate s2The thickness of the water-bearing layer on the slope bottom side of the bottom plate T2The distance from the top of the slope bottom side to the bottom of the aquifer, k is the water permeability coefficient of the aquifer, H2Is a water head at the bottom side of the bottom plate slope,
Figure BDA0003401804470000091
is a corrected value of the length of the pressure-bearing section of the basement bottom plate area,
Figure BDA0003401804470000092
is a water head corrected value of the junction position of the diving water at the lower part of the basement bottom plate, the confined water and the bottom plate,
Figure BDA0003401804470000099
the corrected value of the interface seepage flow of the diving water and the pressure-bearing water at the lower part of the basement bottom plate,
Figure BDA0003401804470000093
the worst cross-sectional head of the floor.
S4, calculating the displacement of a single pressure relief device according to the worst section water head of the bottom plate and the influence radius of the single pressure relief device;
step S4 includes the following substeps:
s41, calculating the influence radius R of a single pressure relief device according to the principle of symmetrically arranging the pressure relief devices;
in step S41, the equation for calculating the radius of influence R of a single pressure relief device is:
Figure BDA0003401804470000094
wherein k is the water permeability coefficient of the aquifer, s is the thickness of the aquifer in the basement floor area, twDrainage time, mu, for a single pressure relief device*Water storage coefficient of a water-containing layer in a basement bottom plate area;
s42, using the middle point position of the overlapped part of the influence radius R of the single pressure relief device as a control point, and calculating the water discharge Q of the single pressure relief device meeting the water head deepening of the control point based on the water head deepening of the middle point of the pressure relief device groupw；
In step S42, calculating the single pressure relief device water discharge Q meeting the control point water head depth reductionwThe formula of (1) is:
Figure BDA0003401804470000095
Figure BDA0003401804470000096
Figure BDA0003401804470000097
wherein T is the water guide coefficient of the aquifer in the basement floor area, dmThe depth of the basement is required to be reduced by the worst cross section of the floating bottom plate, n is the number of the pressure relief devices participating in drainage work, R is the influence radius of a single pressure relief device,
Figure BDA0003401804470000098
the equivalent distance r from all pressure relief devices participating in drainage to the middle point i of the overlapped part of the influence radius of the adjacent pressure relief devices on the basement bottom plate isinThe distance from a certain pressure relief device n participating in drainage work to a point i,
Figure BDA0003401804470000101
the most unfavorable cross-sectional head of the floor, s2The thickness of the water-bearing layer at the slope bottom side of the bottom plate is h, and the self anti-floating water head of the bottom plate is h.
S43 discharge Q of single pressure relief device meeting water head depth reduction of control pointwCalculating the required depth d of a single pressure relief devicew；
Calculating the required drawdown d of a single pressure relief device in step S43wThe formula of (1) is:
Figure BDA0003401804470000102
wherein T is the water guide coefficient of the aquifer in the basement bottom plate area, R is the radius influenced by a single pressure relief device, and QwTo meet the single pressure relief device displacement, r, for controlling the point head depreciationwThe radius of a self water outlet of the pressure relief device;
s44, depth reduction d according to requirement of single pressure relief devicewAnd calculating the radius R of influence of the pressure water on the initial moment of the single pressure relief device0；
In step S44, the radius R of influence of confined water at the initial time is calculated0The formula of (1) is:
Figure BDA0003401804470000103
wherein d iswThe depth required by a single pressure relief device is reduced, and k is the water permeability coefficient of the aquifer;
s45, screening the radius R influenced by the confined water at the initial moment0And a single pressure relief device affects a larger value between radii R
Figure BDA0003401804470000104
S46, in order to ensure that the initial time and the stable drainage period of the pressure relief device meet the pressure relief requirement of the bottom plate, the pressure relief device is used according to a larger value
Figure BDA0003401804470000105
The displacement of a single pressure relief device is recalculated.
The formula for recalculating the displacement of a single pressure relief device in step S46 is as follows:
Figure BDA0003401804470000106
Figure BDA0003401804470000107
wherein the content of the first and second substances,
Figure BDA0003401804470000108
the water discharge amount finally required by a single pressure relief device, T is the water guide coefficient of the aquifer in the basement floor area,
Figure BDA0003401804470000111
the final required depth reduction correction value of a single pressure relief device, R is the influence radius of the single pressure relief device, RwThe radius of the self water outlet of the pressure relief device,
Figure BDA0003401804470000112
influencing the radius R for the initial moment0And a single pressure relief device affects the larger value between the radius R and the R, and k is the water permeability coefficient of the aquifer.
And S5, obtaining the positions and the number of the pressure relief devices on the bottom plate of the slope bottom basement according to the drainage of the single pressure relief device, and realizing the arrangement of the pressure relief devices.
Experiment: the method in the embodiment of the present invention will be described below by taking the basement floor of a slope of the sunken sunny road in Chengdu Tianfu as an example.
First, according to the report on the formula (revision) of the rainstorm intensity in the urban area of the metropolis center issued by the metropolis water administration and the metropolis weather administration in 3 months of 2015, the rainstorm recurrence period P (50 years), the rainfall duration t (240min), and the parameter A in the target site1C, b and n are respectively 0.267, 0.651, 27.346 and 0.953(lgP) -0.017, and the design of the rainstorm strength is that the water head H at the bottom side of the bottom slope of the floor is2Acquiring the rainstorm intensity q to be 0.53 mm/min; selecting a corresponding runoff coefficient psi to be 0.5 according to the building density of the area, and acquiring the water head strength H at the bottom side of the slopeq2Obtaining the water head H on the bottom side of the slope when the water head H is 0.797mm/min25.19 m; secondly, according to the underground water level H on the top side of the slope11m, water layer thickness s on the top side of slope1Thickness s of water-containing layer on slope bottom side of 6.3m23.4m and the water permeability coefficient k of the aquifer, and combines the water head H at the bottom of the slope2The distance T from the top of the slope bottom side to the bottom of the aquifer2Obtaining the water head correction value of the junction position of the diving water, the confined water and the bottom plate
Figure BDA0003401804470000113
A corrected bearing section length of 4.16m
Figure BDA0003401804470000114
228.3 m; secondly, obtaining the most unfavorable section water head corrected value of the bottom plate
Figure BDA0003401804470000115
Then theArranging pressure relief devices according to a symmetrical principle, wherein the influence radius R of the obtained pressure relief devices is 17.78m, the transverse width of the bottom plate is 71.056m, the pressure relief devices are arranged on the inner sides of the side wall contour lines of the slope bottom of the basement, and the required number of the pressure relief devices is 4; calculating the drainage Q of a single pressure relief device meeting the requirement of the water head depth reduction of a control point by taking the middle point position of the overlapped part of the radius R influenced by the pressure relief device as the control pointw＝2.73m3/d。
Finally, the water head of a single pressure relief device is reduced, and the required depth d of the single pressure relief device is calculatedw10.2m, the initial moment radius of influence R is calculated0When the displacement is 0.11m, the displacement of the pressure relief device is recalculated
Figure BDA0003401804470000116
In summary, the transverse width of the bottom plate is 71.056m, the calculated distance between the pressure relief devices is 17.78m, and the water discharge of the pressure relief devices is 733.91m3And d, the number of the devices is 4, and the devices are arranged on the inner side of the side wall contour line of the bottom end of the basement slope.

Claims (1)

1. A method for arranging a pressure relief device on a bottom plate of a basement on a sloping field is characterized by comprising the following steps:
s1, calculating a bottom side water head of the bottom plate slope;
s2, calculating the length of the bearing section according to the bottom side water head of the bottom plate slope;
s3, calculating the worst section water head of the bottom plate according to the length of the bearing segment;
s4, calculating the displacement of a single pressure relief device according to the worst section water head of the bottom plate and the influence radius of the single pressure relief device;
s5, obtaining the positions and the number of the pressure relief devices on the bottom plate of the slope bottom basement according to the drainage of the single pressure relief device, and realizing the arrangement of the pressure relief devices;
step S1 includes the following substeps:
s11, calculating the rainstorm intensity of the target site;
s12, calculating the bottom side water head strength of the bottom slope according to the rainstorm strength and the runoff coefficient of the target site;
s13, calculating the bottom side water head of the bottom slope according to the bottom side water head strength of the bottom slope;
the formula for calculating the rainstorm intensity of the target site in step S11 is:
Figure FDA0003677533720000011
wherein q is the rainstorm intensity of the target site, t is the rainfall time of the target site, A1The rainfall parameter is a rainfall parameter, C is a rainfall variation parameter, b is a rainfall duration correction parameter, m is a rainstorm attenuation index, and P is a rainstorm reappearance period of a target site;
in step S12, the formula for calculating the bottom side water head strength of the bottom slope is:
Hq2＝(1+ψ)q
wherein Hq2The strength of the bottom side water head of the bottom slope is psi, the runoff coefficient is obtained by selecting according to the building density of the target site, and q is the rainstorm strength of the target site;
in step S13, the formula for calculating the bottom side water head of the bottom slope is:
Figure FDA0003677533720000021
wherein H2Is the bottom side water head of the bottom plate slope Hq2The bottom side water head strength of the bottom slope of the bottom plate, t the rainfall time of the target site,
Figure FDA0003677533720000022
the initial value of the water head at the bottom slope side of the bottom plate is obtained;
the formula for calculating the length of the pressure-bearing segment in the step S2 is as follows:
Figure FDA0003677533720000023
Figure FDA0003677533720000024
Figure FDA0003677533720000025
Figure FDA0003677533720000026
wherein HtThe initial value of the water head of the junction position of the diving water, the confined water and the bottom plate at the lower part of the bottom plate of the basement is H1Is the ground water level on the top side of the bottom plate slope, s1The thickness of the water-bearing layer on the top side of the bottom plate slope, s2The thickness of the water-bearing layer on the bottom slope side of the bottom plate H2Is the bottom side water head of the bottom slope, Q is the initial value of the interface seepage quantity of the diving and the confined water at the lower part of the basement bottom plate, k is the water permeability coefficient of the aquifer, T2The distance from the top of the slope bottom side to the bottom of the aquifer,
Figure FDA0003677533720000027
a corrected water head value of the junction position of the diving water at the lower part of the basement bottom plate, the confined water and the bottom plate2The initial length of the pressure-bearing section of the basement floor area, l is the horizontal projection length of the basement floor area,
Figure FDA0003677533720000028
a corrected value of the length of the pressure-bearing section of the basement bottom plate region is obtained;
the formula for calculating the worst section head of the floor in step S3 is:
Figure FDA0003677533720000029
Figure FDA00036775337200000210
Figure FDA0003677533720000031
Figure FDA0003677533720000032
wherein ξoThe resistance coefficient, xi, of the basement bottom plate pressure-bearing area inlet sectionvIs the resistance coefficient of the vertical section inside the pressure-bearing area of the basement bottom plate s2The thickness of the water-bearing layer on the slope bottom side of the bottom plate T2The distance from the top of the slope bottom side to the bottom of the aquifer, k is the water permeability coefficient of the aquifer, H2Is a water head at the bottom side of the bottom plate slope,
Figure FDA0003677533720000033
is a corrected value of the length of the pressure-bearing section of the basement bottom plate area,
Figure FDA0003677533720000034
the water head correction value of the junction position of the diving water at the lower part of the basement bottom plate, the pressure-bearing water and the bottom plate,
Figure FDA0003677533720000035
the corrected value of the interface seepage flow of the diving water and the pressure-bearing water at the lower part of the basement bottom plate,
Figure FDA0003677533720000036
the worst section water head of the bottom plate;
step S4 includes the following substeps:
s41, calculating the influence radius R of a single pressure relief device according to the principle of symmetrically arranging the pressure relief devices;
s42, using the middle point position of the overlapping part of the influence radius R of the single pressure relief device as a control point, and calculating the water discharge Q of the single pressure relief device meeting the water head deepening of the control point based on the water head deepening of the middle point of the pressure relief device groupw；
S43 discharge Q of single pressure relief device meeting water head depth reduction of control pointwCalculating the required drawdown d of a single pressure relief devicew；
S44, depth reduction d according to requirement of single pressure relief devicewAnd calculating the radius R of influence of the pressure water on the initial moment of the single pressure relief device0；
S45, screening the radius R influenced by the confined water at the initial moment0And a single pressure relief device affects a larger value between radii R
Figure FDA0003677533720000037
S46, according to the larger value
Figure FDA0003677533720000038
Recalculating the displacement of a single pressure relief device;
in step S41, the equation for calculating the radius of influence R of a single pressure relief device is:
Figure FDA0003677533720000041
wherein k is the water permeability coefficient of the aquifer, s is the thickness of the aquifer in the basement floor area, twDrainage time, mu, for a single pressure relief device*Water storage coefficient of a water-containing layer in a basement bottom plate area;
calculating the single pressure relief device water discharge Q meeting the control point water head depth reduction in the step S42wThe formula of (1) is:
Figure FDA0003677533720000042
Figure FDA0003677533720000043
Figure FDA0003677533720000044
wherein T is the water guide coefficient of the aquifer in the basement floor area, dmThe depth of the basement is required to be reduced by the worst cross section of the floating bottom plate, n is the number of the pressure relief devices participating in drainage work, R is the influence radius of a single pressure relief device, and R isi *The equivalent distance r from all pressure relief devices participating in drainage to the middle point i of the overlapped part of the influence radius of the adjacent pressure relief devices on the basement bottom plate isinThe distance from a certain pressure relief device n participating in drainage work to a point i,
Figure FDA0003677533720000045
the most unfavorable cross-sectional head of the floor, s2The thickness of the water-bearing layer on the slope bottom side of the bottom plate is h, and the self anti-floating water head of the bottom plate is h;
calculating the required depth d of a single pressure relief device in step S43wThe formula of (1) is:
Figure FDA0003677533720000046
wherein T is the water guide coefficient of the aquifer in the basement bottom plate area, R is the radius influenced by a single pressure relief device, and QwFor a single pressure relief device displacement, r, for meeting the control point head fallwThe radius of a self water outlet of the pressure relief device;
in step S44, the radius R of influence of the confined water at the initial time of the single pressure relief device0The formula of (1) is:
Figure FDA0003677533720000047
wherein d iswThe depth required by a single pressure relief device is reduced, and k is the water permeability coefficient of the aquifer;
the formula for recalculating the displacement of a single pressure relief device in step S46 is as follows:
Figure FDA0003677533720000051
Figure FDA0003677533720000052
wherein the content of the first and second substances,
Figure FDA0003677533720000053
the water discharge amount finally required by a single pressure relief device, T is the water guide coefficient of the aquifer in the basement floor area,
Figure FDA0003677533720000054
the final required depth reduction correction value of a single pressure relief device, R is the influence radius of the single pressure relief device, RwThe radius of the self water outlet of the pressure relief device,
Figure FDA0003677533720000055
influencing the radius R for the initial moment0And a single pressure relief device affects the larger value between the radius R and the R, and k is the water permeability coefficient of the aquifer.
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CN110866648A (en) * 2019-11-19 2020-03-06 北京建筑大学 Urban short-duration rainstorm type construction method
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