CN117669006B - Karst mountain land and rock slope inclined steel pipe pile supporting structure, design method and system - Google Patents
Karst mountain land and rock slope inclined steel pipe pile supporting structure, design method and system Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 280
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- 239000011435 rock Substances 0.000 title claims abstract description 222
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- 239000011150 reinforced concrete Substances 0.000 claims abstract description 29
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- 239000004567 concrete Substances 0.000 claims description 10
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Abstract
The invention provides a support structure, a design method and a system for inclined steel pipe piles of a karst mountain soil and rock side slope, and belongs to the field of geotechnical engineering. Firstly, designing an inclined steel pipe pile supporting structure, wherein the inclined steel pipe pile supporting structure comprises an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam; respectively calculating the resultant force of active soil pressure of soil body part of soil-rock slope and rock body part on the inner side and outer side inclined steel pipe piles，Respectively calculating the line load of the soil body part and the rock body part on the inner side and the outer side of the inclined steel pipe pile according to the resultant force of the active soil pressure; and finally, a load-structure method is adopted to establish a rod finite element model, four line loads are applied to the inner inclined steel pipe pile and the outer inclined steel pipe pile, and the inner forces of the inner inclined steel pipe pile and the outer inclined steel pipe pile are analyzed and designed. The invention expands the application of the inclined pile in the field of karst mountain landslide and engineering slope.
Description
Technical Field
The invention belongs to the field of geotechnical engineering, and particularly relates to a support structure, a design method and a system for a slope of a karst mountain soil and rock.
Background
The damage and transformation of underground water and surface water to soluble rock is called karst, the geomorphic phenomenon and hydrogeology phenomenon generated by the method are called karst, and water has various functions of chemical erosion, underetching, collapse and the like to the soluble rock, so that the geomorphic region has complex topography and geomorphic, the ecological environment is fragile, the infrastructure of traffic and the like is weak, geological disasters are easy to occur, and landslide, collapse and the like are easy to occur particularly on the soil-rock slope of the karst mountain area. Therefore, reinforcement treatment is generally required for karst mountainous areas, particularly side slopes, where safety hazards exist.
At present, a reinforcing pile mode is generally adopted for slope reinforcement. As the slope area generally has a certain inclination angle, the slope pile is more suitable for being adopted. Although the technology of the inclined piles is applied to the soft soil area in a mature mode, when the technology is applied to the soil-rock slope in the karst mountain area, the distribution form of the soil pressure on the inclined piles is different from that of the soil pressure in the soft soil area, and the technology of the inclined piles is designed according to different states of the slope body to achieve the best reinforcement effect.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, the invention aims to provide a support structure, a design method and a system for a slope steel pipe pile of a soil and rock slope in a karst mountain area, and provides design basis for the slope pile according to soil pressure characteristics of soil and rock materials.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for designing a supporting structure of a slope of a soil-rock side in a karst mountain area, including the following steps:
s1, designing an inclined steel pipe pile supporting structure, wherein the inclined steel pipe pile supporting structure comprises an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam, one ends of the inner inclined steel pipe pile and the outer inclined steel pipe pile, which are connected, form a preset included angle and are jointly connected to the lower side of the reinforced concrete connecting beam, a steel reinforcement cage is welded on the outer inclined steel pipe pile, and concrete is sprayed on the steel reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom;
s2, calculating active soil pressure resultant force of soil mass part of soil-rock slope to inner inclined steel pipe pileAnd active soil pressure resultant force of outside inclined steel pipe pile +.>；
Step S3, respectively calculating line loads of the soil body part of the soil rock slope to the inner inclined steel pipe pile and the outer inclined steel pipe pile according to the resultant force of the active soil pressure of the soil body partP In soil line 、P Outside the soil line ；
S4, calculating active soil pressure resultant force of the soil-rock slope rock mass part on the inner inclined steel pipe pileAnd active soil pressure resultant force of outside inclined steel pipe pile +.>；
Step S5, respectively calculating line loads of the soil-rock slope rock mass part on the inner inclined steel pipe pile and the outer inclined steel pipe pile according to active soil pressure resultant force of the rock mass partP In rock line 、P Outside of rock line ；
S6, simulating soil mass of the embedded section of the inclined steel pipe pile and soil mass between piles by adopting springs, building a rod system finite element model according to a load-structure method, and performing mass-structure modelingP In soil line 、P Outside the soil line 、P In rock line 、P Outside of rock line And (3) applying the internal force to the inner inclined steel pipe pile and the outer inclined steel pipe pile, and analyzing and designing the internal force of the inner inclined steel pipe pile and the inner force of the outer inclined steel pipe pile.
As a preferred embodiment of the present invention, in step S2, the active soil pressure resultant force of the soil body portion on the inner inclined steel pipe pile is calculated using the method (1)：
（1）
In the formula (1), the components are as follows,active soil pressure resultant force of the inclined steel pipe pile at the inner side of the soil body part is in kN/m;γ soil Is soil body weight, and the unit is kN/m 3 ；H Soil The unit is m, which is the height of the soil body part of the soil-rock slope; />Is the coulomb initiative soil pressure coefficient of the soil body of the inner inclined pile, +.>The calculation formula is shown as formula (2):
（2）
in the formula (2), the amino acid sequence of the compound,α inner part The unit is an angle between the inner inclined steel pipe pile and the horizontal plane;is the internal friction angle of the soil body, and the unit is an angle; />The friction angle between the soil body and the inclined steel pipe pile is expressed as an angle;K qsoil Andηfor calculating parameters;
K qsoil The calculation formula is shown as formula (3):
（3）
in the formula (3), the amino acid sequence of the compound,quniformly distributing load for the slope top, wherein the unit is kPa;
ηthe calculation formula is shown as formula (4):
（4）
in the formula (4), the amino acid sequence of the compound,cthe unit is kPa for soil cohesion;
when calculating the resultant force of the active soil pressure of the soil body part to the outer steel pipe pileWhen it is desired to use the formulae (1) to (4)α Inner part The outside inclined steel pipe pile is replaced with a horizontal included angleα Outer part The remaining parameters are unchanged.
As a preferred embodiment of the present invention, step S3 is to define first the calculated width of the soil pressure of the inner side inclined steel pipe pile when calculating the line load of the soil portion of the earth-rock slope to the inner side inclined steel pipe pile and the outer side inclined steel pipe pile according to the resultant force of the active soil pressure of the soil portionb 0 in And incline outsideWidth of calculation of soil pressure of steel pipe pileb 0 outside Wherein, the method comprises the steps of, wherein,
（6）
in the formula (6), the amino acid sequence of the compound,dthe unit is m, which is the outer diameter of the steel pipe pile;
（9）
in the formula (9), the amino acid sequence of the compound,sthe unit is m for the distance between adjacent inclined steel pipe piles at the inner side and the outer side;
and then calculating the width according to the soil pressure of the inner inclined steel pipe pileb 0 in And outside slope steel-pipe pile soil pressure calculation widthb 0 outside And calculating soil body horizontal active soil pressure resultant force within the width, and finally calculating line load according to soil pressure distribution.
As a preferred embodiment of the present invention, the calculating the soil horizontal active soil pressure resultant force within the width specifically includes: resultant force of active soil pressure according to soil body partCalculating soil body horizontal active soil pressure resultant force within the calculation width of inner inclined steel pipe pile>The calculation formula is shown as formula (5):
（5）
according to the triangular soil pressure distribution, the inner side of the inclined steel pipe pile is used for partially carrying out line load on the soil bodyP In soil line The calculation formula is shown as formula (7):
（7）；
according to the resultant force of active soil pressureCalculating soil body horizontal active soil pressure resultant force within the calculated width of outer inclined steel pipe pile>The calculation formula is shown as formula (8):
（8）
according to the triangular soil pressure distribution, the outside inclined steel pipe pile soil body part line loadP Outside the soil line The calculation formula is shown as formula (10):
（10）。
as a preferred embodiment of the invention, in the step S4, the total force of the active soil pressure of the inner inclined steel pipe pile of the soil-rock slope rock mass part is calculated by adopting the formula (11)：
（11）
In the formula (11), the amino acid sequence of the compound,γ rock Is the weight of rock mass, and the unit is kN/m 3 ；H Rock The unit is m, which is the height of the rock mass part of the earth-rock slope;coulomb initiative soil pressure coefficient for inner inclined pile rock mass, +.>The calculation formula is shown as formula (12):
（12）
in the formula (12), the amino acid sequence of the compound,α inner part The unit is an angle between the inner inclined steel pipe pile and the horizontal plane;is an equivalent internal friction angle of a rock mass, and the unit is an angle; />The friction angle between the rock mass and the inclined steel pipe pile is expressed as an angle;K qrock In order to calculate the parameters of the device,K qrock The calculation formula is shown as formula (13):
（13）
in the formula (13), the amino acid sequence of the compound,q rock The unit is kPa for the sum of the self-weight pressure of the earth covered on the rock mass and the uniformly distributed load on the top of the slope;
when the active soil pressure resultant force of the outer steel pipe pile of the soil-rock slope rock mass part is calculatedWhen the formulae (11) - (13) are usedα Inner part The outside inclined steel pipe pile is replaced with a horizontal included angleα Outer part The remaining parameters are unchanged.
As a preferred embodiment of the present invention, step S5 specifically includes: based on active earth pressure forces of rock mass portionsCalculating the total force of rock mass horizontal active soil pressure in the calculation width of the inner inclined steel pipe pile>The calculation formula is shown as formula (14):
（14）
according to rectangular soil pressure distribution, the rock mass part of the inner inclined steel pipe pile is loaded by the lineP In rock line The calculation formula is shown as formula (15):
（15）
according to the resultant force of active soil pressureCalculating the resultant force of horizontal active soil pressure of rock mass in the calculated width of the outer inclined steel pipe pile>The calculation formula is shown as formula (16):
（16）
according to rectangular soil pressure distribution, the outside inclined steel pipe pile rock mass part line loadP Outside of rock line The calculation formula is shown as formula (17):
（17）。
in a second aspect, the embodiment of the invention also provides a supporting structure of the inclined steel pipe pile of the soil-rock side slope in the karst mountain area, which comprises an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam, wherein one end of the inner inclined steel pipe pile connected with the outer inclined steel pipe pile forms a preset included angle and is connected with the lower side of the reinforced concrete connecting beam together; a reinforcement cage is welded on the outer inclined steel pipe pile, and concrete is sprayed on the reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom;
the specific parameters of the inclined steel pipe pile are designed by adopting the design method.
In a third aspect, the embodiment of the present invention further provides a system for designing a supporting structure of a slope of a soil-rock side in a karst mountain area, the system comprising: the structure design module and the parameter design module; wherein,
the structural design module is used for constructing an inclined steel pipe pile geometric structure model;
the parameter design module is used for designing parameters of the inclined steel pipe pile based on the inclined steel pipe pile model constructed by the structural design module.
As a preferred embodiment of the invention, the inclined steel pipe pile geometric structure model constructed by the structural design module comprises an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam, wherein one ends of the inner inclined steel pipe pile and the outer inclined steel pipe pile which are connected form a preset included angle and are commonly connected to the lower side of the reinforced concrete connecting beam; a reinforcement cage is welded on the outer inclined steel pipe pile, and concrete is sprayed on the reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom;
the parameter design module comprises: the system comprises a soil body part active soil pressure resultant force calculation sub-module, a soil body part line load calculation sub-module, a rock body part active soil pressure resultant force calculation sub-module, a rock body part line load calculation sub-module, a rod system finite element analysis sub-module and a parameter output sub-module; wherein,
the soil body part active soil pressure resultant force calculation submodule is used for calculating active soil pressure resultant force of the soil body part of the soil-rock slope on the inner side inclined steel pipe pile and active soil pressure resultant force of the outer side inclined steel pipe pile;
the soil part line load calculation submodule is used for calculating line loads of the soil part of the soil-rock slope to the inner side inclined steel pipe pile and the outer side inclined steel pipe pile according to resultant force of active soil pressure of the soil partP In soil line 、P Outside the soil line ；
The rock mass part active soil pressure resultant force calculation submodule is used for calculating active soil pressure resultant force of the soil-rock side slope rock mass part on the inner side inclined steel pipe pileAnd active soil pressure resultant force of outside inclined steel pipe pile +.>；
The rock mass part line load calculation submodule is used for calculating line loads of the rock mass part of the earth-rock slope to the inner side inclined steel pipe pile and the outer side inclined steel pipe pile according to active earth pressure resultant force of the rock mass partP In rock line 、P Outside of rock line ；
The rod system finite element analysis submodule is used for simulating soil mass of an embedded section of the inclined steel pipe pile and soil mass between piles by adopting springs, and establishing a rod system finite element model according to a load-structure methodP In soil line 、P Outside the soil line 、P In rock line 、P Outside of rock line Applying the internal force to the inner inclined steel pipe pile and the outer inclined steel pipe pile, analyzing the internal force of the inner inclined steel pipe pile and the outer inclined steel pipe pile, designing, and sending parameters to the parameter output submodule;
and the parameter output submodule is used for outputting parameters of the designed inclined steel pipe pile.
As a preferred embodiment of the present invention, the parameters of the inclined steel pipe pile include an outer diameter of the steel pipe pile, a wall thickness and a steel type.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the karst mountain land and rock slope inclined steel pipe pile supporting structure and the design method, the soil body part and the rock soil part are respectively considered, meanwhile, the influence of the inclination angles of the inner steel pipe and the outer steel pipe on the soil pressure and the distribution of the soil pressure of the inner steel pipe pile and the outer steel pipe pile are considered, the obtained load boundary condition provides support for building a load-structure method finite element model, the application of the inclined pile in the karst mountain land landslide and engineering slope field is expanded, the pile anchor supporting system can be replaced by the supporting system according to actual conditions, and the engineering problem of poor anchor cable durability of the pile anchor supporting system can be effectively solved.
Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a flow chart of a method for designing a supporting structure of a slope of a soil and rock in a karst mountain area according to an embodiment of the present invention;
FIG. 2 is a schematic view of a supporting structure of the inclined steel pipe according to the embodiment of the present invention;
fig. 3 is a schematic view of a finite element model of a load-structural method rod system of the inclined steel pipe support structure according to an embodiment of the present invention.
Reference numerals illustrate:
1-inner inclined steel pipe pile; 2-outside inclined steel pipe piles; 3-reinforced concrete connecting beam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. It should be noted that, in the case of no conflict, the embodiments of the present invention and features in the embodiments may also be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present invention, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Based on the problem of how to apply the inclined pile to the karst mountain area soil-rock side slope for supporting in the prior art, the embodiment of the invention provides an inclined steel pipe pile supporting structure and a design method, two geological materials of soil and rock are comprehensively considered, active soil pressure resultant force of soil body parts and rock body parts on inner and outer inclined steel pipe piles is calculated according to coulomb soil pressure theory, line load is determined according to the soil pressure sharing range of the inner and outer steel pipe piles, a load-structure method is adopted to establish a finite element model of a rod system, and the line load is respectively applied to the inner and outer inclined steel pipe piles for analyzing and designing the internal force of the steel pipe piles.
1-3, the design method of the karst mountain soil-rock side slope inclined steel pipe pile supporting structure comprises the following steps:
step S1, designing an inclined steel pipe pile supporting structure shown in fig. 2, wherein the inclined steel pipe pile supporting structure comprises an inner inclined steel pipe pile 1, an outer inclined steel pipe pile 2 and a reinforced concrete connecting beam 3, and one ends of the inner inclined steel pipe pile 1 and the outer inclined steel pipe pile 2, which are connected, form a preset included angle and are connected to the lower side of the reinforced concrete connecting beam 3 together; a reinforcement cage is welded on the outer inclined steel pipe pile 2, and concrete is sprayed on the reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom. The inner and outer sides are referred to herein as side slopes.
Step S2, calculating the resultant force of active soil pressure of the soil mass part of the soil-rock slope to the inner inclined steel pipe pile 1And active soil pressure resultant force of outer inclined steel pipe pile 2 +.>。
In the step, active soil pressure resultant force of the soil body part on the inner inclined steel pipe pile 1 and the outer inclined steel pipe pile 2 is calculated by adopting a coulomb soil pressure theory. Active soil pressure resultant forceComprising the active soil pressure resultant force of the soil body part to the inner inclined steel pipe pile 1>And outside inclined steelActive soil pressure resultant force of pipe pile 2>The calculation principle and the formula of the two are the same, and the difference is that the adopted parameters are different.
Specifically, the total force of the active soil pressure of the inner inclined steel pipe pile of the soil body part of the soil-rock side slope is calculated according to the formulas (1) to (4)And the active soil pressure resultant force of the outside inclined steel pipe pile +.>：
（1）
In the formula (1), the components are as follows,active soil pressure resultant force of the inclined steel pipe pile at the inner side of the soil body part is in kN/m;γ soil Is soil body weight, and the unit is kN/m 3 ；H Soil The unit is m, which is the height of the soil body part of the soil-rock slope; />Is the coulomb initiative soil pressure coefficient of the soil body of the inner inclined pile, +.>The calculation formula is shown as formula (2):
（2）
in the formula (2), the amino acid sequence of the compound,α inner part The unit is an angle between the inner inclined steel pipe pile and the horizontal plane;is the internal friction angle of the soil body, and the unit is an angle; />The friction angle between the soil body and the inclined steel pipe pile is expressed as an angle;K qsoil Andηfor calculating parameters;
K qsoil The calculation formula is shown as formula (3):
（3）
in the formula (3), the amino acid sequence of the compound,quniformly distributing load for the slope top, wherein the unit is kPa;
ηthe calculation formula is shown as formula (4):
（4）
in the formula (4), the amino acid sequence of the compound,cthe unit is kPa for soil cohesion;
when calculating the resultant force of the active soil pressure of the soil body part to the outer steel pipe pileWhen it is desired to use the formulae (1) to (4)α Inner part The outside inclined steel pipe pile is replaced with a horizontal included angleα Outer part The remaining parameters are unchanged.
And S3, respectively calculating the line load of the soil body part of the soil-rock side slope to the inner inclined steel pipe pile and the outer inclined steel pipe pile according to the resultant force of the active soil pressure of the soil body part.
In this step, according to the obtainedCalculating soil body horizontal active soil pressure resultant force within the calculation width of inner inclined steel pipe pile>The calculation formula is shown as formula (5):
（5）
in the formula (5), the amino acid sequence of the compound,b 0 in Calculating the width (m) for the soil pressure of the inner inclined steel pipe pile, wherein the calculation formula is shown in formula (6):
（6）
in the formula (6), the amino acid sequence of the compound,dthe outer diameter (m) of the steel pipe pile.
According to the triangular soil pressure distribution, the inner side of the inclined steel pipe pile is used for partially carrying out line load on the soil bodyP In soil line The calculation formula is shown as formula (7):
（7）；
according to the resultant force of active soil pressureCalculating soil body horizontal active soil pressure resultant force within the calculated width of outer inclined steel pipe pile>The calculation formula is shown as formula (8):
（8）
in the formula (8), the amino acid sequence of the compound,b 0 outside Calculating the width for the soil pressure of the outer inclined steel pipe pile, wherein the unit is m, and the calculation formula is shown as formula (9):
（9）
in the formula (9), the amino acid sequence of the compound,sthe unit is m for the distance between adjacent inclined steel pipe piles at the inner side and the outer side;
according to the triangular soil pressure distribution, the inner side of the inclined steel pipe pile is used for partially carrying out line load on the soil bodyP In soil line The calculation formula is shown as formula (10):
（10）。
step S4, calculating the resultant force of active soil pressure of the soil-rock slope rock mass part on the inner inclined steel pipe pile 1And active soil pressure resultant force of outer inclined steel pipe pile 2 +.>。
In the step, the total force of the active soil pressure of the inner side steel pipe pile of the rock mass part of the earth-rock side slope is calculated according to formulas (11) to (13)And the active soil pressure resultant force of the outer steel pipe pile +.>。
Specifically, the formula (11) is adopted to calculate the active soil pressure resultant force of the inner inclined steel pipe pile of the rock mass part of the soil-rock slope：
（11）
In the formula (11), the amino acid sequence of the compound,γ rock Is the weight of rock mass, and the unit is kN/m 3 ；H Rock The unit is m, which is the height of the rock mass part of the earth-rock slope;coulomb initiative soil pressure coefficient for inner inclined pile rock mass, +.>The calculation formula is shown as formula (12):
（12）
in the formula (12), the amino acid sequence of the compound,α inner part The unit is an angle between the inner inclined steel pipe pile and the horizontal plane;is an equivalent internal friction angle of a rock mass, and the unit is an angle; />The friction angle between the rock mass and the inclined steel pipe pile is expressed as an angle;K qrock In order to calculate the parameters of the device,K qrock The calculation formula is shown as formula (13):
（13）
in the formula (13), the amino acid sequence of the compound,q rock The unit is kPa for the sum of the self-weight pressure of the earth covered on the rock mass and the uniformly distributed load on the top of the slope;
when the active soil pressure resultant force of the outer steel pipe pile of the soil-rock slope rock mass part is calculatedWhen the formulae (11) - (13) are usedα Inner part The outside inclined steel pipe pile is replaced with a horizontal included angleα Outer part The remaining parameters are unchanged.
Step S5, respectively calculating line loads of the soil-rock slope rock mass part on the inner inclined steel pipe pile and the outer inclined steel pipe pile according to active soil pressure resultant force of the rock mass partP In rock line 、P Outside of rock line 。
In this step, the resultant force of the active earth pressure according to the rock mass partCalculating the total force of rock mass horizontal active soil pressure in the calculation width of the inner inclined steel pipe pile>The calculation formula is shown as @ m14 Shown in the specification):
（14）
according to rectangular soil pressure distribution, the rock mass part of the inner inclined steel pipe pile is loaded by the lineP In rock line The calculation formula is shown as formula (15):
（15）
according to the resultant force of active soil pressureCalculating the resultant force of horizontal active soil pressure of rock mass in the calculated width of the outer inclined steel pipe pile>The calculation formula is shown as formula (16):
（16）
according to rectangular soil pressure distribution, the outside inclined steel pipe pile rock mass part line loadP Outside of rock line The calculation formula is shown as formula (17):
（17）。
s6, simulating soil mass of the embedded section of the inclined steel pipe pile and soil mass between piles by adopting springs, building a rod system finite element model according to a load-structure method, and performing mass-structure modelingP In soil line 、P Outside the soil line 、P In rock line 、P Outside of rock line As shown in fig. 3, the inner forces applied to the inner inclined steel pipe pile 1 and the outer inclined steel pipe pile 2 are analyzed and designed.
Based on the same thought, the embodiment of the invention also provides a karst mountain soil and rock slope inclined steel pipe pile supporting structure, which comprises an inner inclined steel pipe pile 1, an outer inclined steel pipe pile 2 and a reinforced concrete connecting beam 3, wherein one ends of the inner inclined steel pipe pile 1 and the outer inclined steel pipe pile 2 form a preset included angle and are connected with the lower side of the reinforced concrete connecting beam 3 together; a reinforcement cage is welded on the outer inclined steel pipe pile 2, and concrete is sprayed on the reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom; the concrete parameters of the supporting structure are obtained through a design method of the karst mountain soil-rock side slope inclined steel pipe pile supporting structure.
In addition, the embodiment of the invention also provides a system for designing the inclined steel pipe pile supporting structure of the soil and rock side slope in the karst mountain area, which comprises the following steps: the structure design module and the parameter design module; the structural design module is used for constructing an inclined steel pipe pile geometric structure model; the parameter design module is used for designing parameters of the inclined steel pipe pile based on the inclined steel pipe pile model constructed by the structural design module.
The inclined steel pipe pile geometric structure model constructed by the structural design module comprises an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam, wherein one ends of the inner inclined steel pipe pile and the outer inclined steel pipe pile which are connected form a preset included angle and are connected to the lower side of the reinforced concrete connecting beam together; a reinforcement cage is welded on the outer inclined steel pipe pile, and concrete is sprayed on the reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom;
the parameter design module comprises: the system comprises a soil body part active soil pressure resultant force calculation sub-module, a soil body part line load calculation sub-module, a rock body part active soil pressure resultant force calculation sub-module, a rock body part line load calculation sub-module, a rod system finite element analysis sub-module and a parameter output sub-module; wherein,
the soil body part active soil pressure resultant force calculation submodule is used for calculating active soil pressure resultant force of the soil body part of the soil-rock slope to the inner inclined steel pipe pileAnd active soil pressure resultant force of outside inclined steel pipe pile +.>；
The soil part line load calculation submodule is used for calculating line loads of the soil part of the soil-rock slope to the inner side inclined steel pipe pile and the outer side inclined steel pipe pile according to resultant force of active soil pressure of the soil partP In soil line 、P Outside the soil line ；
The rock mass part active soil pressure resultant force calculation submodule is used for calculating active soil pressure resultant force of the soil-rock side slope rock mass part on the inner side inclined steel pipe pileAnd active soil pressure resultant force of outside inclined steel pipe pile +.>；
The rock mass part line load calculation submodule is used for calculating line loads of the rock mass part of the earth-rock slope to the inner side inclined steel pipe pile and the outer side inclined steel pipe pile according to active earth pressure resultant force of the rock mass partP In rock line 、P Outside of rock line ；
The rod system finite element analysis submodule is used for simulating soil mass of an embedded section of the inclined steel pipe pile and soil mass between piles by adopting springs, and establishing a rod system finite element model according to a load-structure methodP In soil line 、P Outside the soil line 、P In rock line 、P Outside of rock line Applying the internal force to the inner inclined steel pipe pile and the outer inclined steel pipe pile, analyzing the internal force of the inner inclined steel pipe pile and the outer inclined steel pipe pile, designing, and sending parameters to the parameter output submodule;
and the parameter output submodule is used for outputting parameters of the designed inclined steel pipe pile.
Preferably, the parameters of the inclined steel pipe pile comprise the outer diameter, the wall thickness and the steel type of the steel pipe pile.
The modules in this embodiment are implemented by a processor, and the memory is appropriately increased when storage is required. The processor may be, but is not limited to, a microprocessor MPU, a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), other programmable logic devices, discrete gates, transistor logic devices, discrete hardware components, or the like. The Memory may include random access Memory (Random Access Memory, RAM) or may include Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present invention, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.).
In addition, it should be noted that, the design system of the karst mountain soil and rock slope inclined steel pipe pile supporting structure in this embodiment corresponds to the design method of the karst mountain soil and rock slope inclined steel pipe pile supporting structure, and the description and limitation of the method are also applicable to the system and are not repeated here.
According to the technical scheme, the supporting structure, the design method and the design system for the karst mountain soil and rock slope inclined steel pipe pile provided by the embodiment of the invention consider the soil body part and the rock and soil part respectively, simultaneously consider the influence of the inclination angles of the inner steel pipe and the outer steel pipe on the soil pressure and the distribution of the soil pressure of the inner steel pipe pile and the outer steel pipe pile, and the obtained load boundary conditions provide support for building a load-structure finite element model, so that the application of the inclined pile in the fields of karst mountain landslide and engineering slope is expanded.
The above description is only of the preferred embodiments of the present invention and the description of the technical principles applied is not intended to limit the scope of the invention as claimed, but merely represents the preferred embodiments of the present invention. It will be appreciated by persons skilled in the art that the scope of the invention referred to in the present invention is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Claims (9)
1. The design method of the inclined steel pipe pile supporting structure of the soil and rock side slope in the karst mountain area is characterized by comprising the following steps:
s1, designing an inclined steel pipe pile supporting structure, wherein the inclined steel pipe pile supporting structure comprises an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam, one ends of the inner inclined steel pipe pile and the outer inclined steel pipe pile, which are connected, form a preset included angle and are jointly connected to the lower side of the reinforced concrete connecting beam, a steel reinforcement cage is welded on the outer inclined steel pipe pile, and concrete is sprayed on the steel reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom;
s2, calculating active soil pressure resultant force E of soil mass part of soil-rock slope to inner inclined steel pipe pile a in the soil Active soil pressure combination with outside inclined steel pipe pileForce E a outside soil ；
Step S3, respectively calculating line loads P of soil body parts of the soil rock side slope to the inner inclined steel pipe pile and the outer inclined steel pipe pile according to active soil pressure resultant force of the soil body parts In soil line 、P Outside the soil line ；
S4, calculating active soil pressure resultant force E of the soil-rock slope rock mass part on the inner inclined steel pipe pile In a rock And active soil pressure resultant force E of outer inclined steel pipe pile Outer rock of a-rock ；
Step S5, respectively calculating line loads P of the rock mass part of the earth-rock side slope to the inner inclined steel pipe pile and the outer inclined steel pipe pile according to the resultant force of the active earth pressure of the rock mass part In rock line 、P Outside of rock line ；
S6, simulating soil mass of the embedded section of the inclined steel pipe pile and soil mass between piles by adopting a spring, building a rod system finite element model according to a load-structure method, and carrying out P In soil line 、P Outside the soil line 、P In rock line 、P Outside of rock line And (3) applying the internal force to the inner inclined steel pipe pile and the outer inclined steel pipe pile, and analyzing and designing the internal force of the inner inclined steel pipe pile and the inner force of the outer inclined steel pipe pile.
2. The method for designing a supporting structure for a slope of a karst mountain land and rock, as set forth in claim 1, wherein in step S2, the resultant force E of the active soil pressure of the soil portion on the inside slope steel pipe pile is calculated by using (1) a in the soil ：
In the formula (1), E a in the soil Active soil pressure resultant force of the inclined steel pipe pile at the inner side of the soil body part is in kN/m; gamma ray Soil Is soil body weight, and the unit is kN/m 3 ；H Soil The unit is m, which is the height of the soil body part of the soil-rock slope; k (K) a in the soil Is the coulomb initiative soil pressure coefficient, K of the soil body of the inner inclined pile a in the soil The calculation formula is shown as formula (2):
in the formula (2), alpha Inner part The unit is an angle between the inner inclined steel pipe pile and the horizontal plane;is the internal friction angle of the soil body, and the unit is an angle; delta Soil The friction angle between the soil body and the inclined steel pipe pile is expressed as an angle; k (K) q soil And eta is a calculation parameter;
K q soil The calculation formula is shown as formula (3):
in the formula (3), q is uniformly distributed load on the top of a slope, and the unit is kPa;
the eta calculation formula is shown as formula (4):
in the formula (4), c is soil cohesion, and the unit is kPa;
when calculating the resultant force E of the active soil pressure of the soil body part to the outer steel pipe pile a outside soil When alpha in the formulas (1) - (4) is used Inner part The inclined steel pipe pile at the outer side is replaced to have an included angle alpha with the horizontal Outer part The remaining parameters are unchanged.
3. The method for designing a supporting structure for a slope of a karst mountain land and rock, as set forth in claim 2, wherein in step S3, when calculating line loads of the soil portion of the slope of the land and rock to the inner slope steel pipe pile and the outer slope steel pipe pile, respectively, based on resultant forces of active soil pressures of the soil portion, first, calculating widths b of the soil pressures of the inner slope steel pipe pile and the outer slope steel pipe pile are defined, respectively 0 in And outside inclined steel pipe pile soil pressure calculation width b 0 outside Which is provided withIn b 0 in In the formula (6) =0.9× (1.5·d+0.5) (6), d is the outer diameter of the steel pipe pile, and the unit is m;
b 0 outside ＝s-b 0 in (9) In the formula (9), s is the distance between adjacent inclined steel pipe piles at the inner side and the outer side, and the unit is m;
and then calculating the width b according to the soil pressure of the inner inclined steel pipe pile 0 in And outside inclined steel pipe pile soil pressure calculation width b 0 outside And calculating soil body horizontal active soil pressure resultant force within the width, and finally calculating line load according to soil pressure distribution.
4. The method for designing a supporting structure of a slope of a karst mountain land and rock, according to claim 3, wherein the step of calculating the soil horizontal active soil pressure resultant force within the width comprises the following steps: resultant force E of active soil pressure according to soil body part a in the soil Calculating soil horizontal active soil pressure resultant force E in calculation width of inner inclined steel pipe pile ax in soil The calculation formula is shown as formula (5):
E ax in soil ＝1.35×b 0 in ×E a in the soil ×cos(180°-α Inner part +δ Soil ) (5)
According to the triangular soil pressure distribution, the line load P of the soil body part of the inner inclined steel pipe pile In soil line The calculation formula is shown as formula (7):
according to the active soil pressure resultant force E a outside soil Calculating soil body horizontal initiative soil pressure resultant force E in calculated width of outer inclined steel pipe pile ax outside soil The calculation formula is shown as formula (8):
E ax outside soil ＝1.35×b 0 outside ×E a outside soil ×cos(180°-α Outer part +δ Soil ) (8)
According to the triangular soil pressure distribution, the outside inclined steel pipe pile soil body part line load P Outside the soil line The calculation formula is shown as formula (10):
5. the method for designing a supporting structure for a slope of a soil-rock mass in karst mountain areas according to claim 4, wherein in step S4, the active soil pressure resultant force E of the slope of the inside of the soil-rock mass portion is calculated by using formula (11) In a rock ：
In the formula (11), gamma Rock Is the weight of rock mass, and the unit is kN/m 3 ；H Rock The unit is m, which is the height of the rock mass part of the earth-rock slope; k (K) In a rock Is the coulomb initiative soil pressure coefficient, K of the inner inclined pile rock mass In a rock The calculation formula is shown as formula (12):
in the formula (12), alpha Inner part The unit is an angle between the inner inclined steel pipe pile and the horizontal plane;is an equivalent internal friction angle of a rock mass, and the unit is an angle; delta Rock The friction angle between the rock mass and the inclined steel pipe pile is expressed as an angle; k (K) q rock To calculate the parameters, K q rock The calculation formula is shown as formula (13):
in the formula (13), q Rock The unit is kPa for the sum of the self-weight pressure of the earth covered on the rock mass and the uniformly distributed load on the top of the slope;
when the active soil pressure resultant force E of the outer steel pipe pile of the soil-rock slope rock mass part is calculated Outer rock of a-rock When alpha in formulas (11) - (13) Inner part The inclined steel pipe pile at the outer side is replaced to have an included angle alpha with the horizontal Outer part The remaining parameters are unchanged.
6. The method for designing a supporting structure for a slope of a karst mountain land and rock, as set forth in claim 5, wherein the step S5 specifically includes: based on active earth pressure resultant E of rock mass portion In a rock Calculating rock mass horizontal active soil pressure resultant force E in calculation width of inner inclined steel pipe pile Within ax rock The calculation formula is shown as formula (14):
E within ax rock ＝1.35×b 0 in ×E In a rock ×cos(180°-α Inner part +δ Rock ) (14)
According to rectangular soil pressure distribution, the rock mass part of the inner inclined steel pipe pile is loaded with line P In rock line The calculation formula is shown as formula (15):
according to the active soil pressure resultant force E Outer rock of a-rock Calculating rock mass horizontal active soil pressure resultant force E in calculation width of outer inclined steel pipe pile Outside of ax rock The calculation formula is shown as formula (16):
E outside of ax rock ＝1.35×b 0 outside ×E Outer rock of a-rock ×cos(180°-α Outer part +δ Rock ) (16)
According to rectangular soil pressure distribution, the outside inclined steel pipe pile rock mass part line load P Outside of rock line The calculation formula is shown as formula (17):
7. the inclined steel pipe pile supporting structure is characterized by comprising an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam, wherein one ends of the inner inclined steel pipe pile and the outer inclined steel pipe pile which are connected form a preset included angle and are connected to the lower side of the reinforced concrete connecting beam together; a reinforcement cage is welded on the outer inclined steel pipe pile, and concrete is sprayed on the reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom;
the specific parameters of the inclined steel pipe pile are designed by adopting the design method as set forth in any one of claims 1 to 6.
8. A design system for a karst mountain land and rock side slope inclined steel pipe pile supporting structure, the system comprising: the structure design module and the parameter design module; wherein,
the structural design module is used for constructing an inclined steel pipe pile geometric structure model;
the parameter design module is used for designing parameters of the inclined steel pipe pile based on the inclined steel pipe pile model constructed by the structural design module;
the inclined steel pipe pile geometric structure model constructed by the structural design module comprises an inner inclined steel pipe pile, an outer inclined steel pipe pile and a reinforced concrete connecting beam, wherein one ends of the inner inclined steel pipe pile and the outer inclined steel pipe pile which are connected form a preset included angle and are connected to the lower side of the reinforced concrete connecting beam together; a reinforcement cage is welded on the outer inclined steel pipe pile, and concrete is sprayed on the reinforcement cage to form a reinforced concrete panel; the supporting structure comprises a soil body contact part, a rock body contact part and a embedding section from top to bottom;
the parameter design module comprises: the system comprises a soil body part active soil pressure resultant force calculation sub-module, a soil body part line load calculation sub-module, a rock body part active soil pressure resultant force calculation sub-module, a rock body part line load calculation sub-module, a rod system finite element analysis sub-module and a parameter output sub-module; wherein,
active soil pressure resultant force calculation submodule for soil body partActive soil pressure resultant force E for calculating inner inclined steel pipe pile of soil mass part of soil-rock slope a in the soil And active soil pressure resultant force E of outer inclined steel pipe pile a outside soil ；
The soil part line load calculation submodule is used for calculating line loads P of the soil part of the soil-rock slope to the inner side inclined steel pipe pile and the outer side inclined steel pipe pile according to resultant force of active soil pressure of the soil part In soil line P is outside the soil line;
the rock mass part active soil pressure resultant force calculation submodule is used for calculating active soil pressure resultant force E of the soil-rock side slope rock mass part on the inner side inclined steel pipe pile In a rock And active soil pressure resultant force E of outer inclined steel pipe pile Outer rock of a-rock ；
The rock mass part line load calculation submodule is used for respectively calculating line loads P of the rock mass part of the earth-rock side slope to the inner side inclined steel pipe pile and the outer side inclined steel pipe pile according to active earth pressure resultant force of the rock mass part In rock line 、P Outside of rock line ；
The rod system finite element analysis submodule is used for simulating soil mass of an embedded section of the inclined steel pipe pile and soil mass between piles by adopting springs, and establishing a rod system finite element model according to a load-structure method, and carrying out P In soil line 、P Outside the soil line 、P In rock line 、P Outside of rock line Applying the internal force to the inner inclined steel pipe pile and the outer inclined steel pipe pile, analyzing the internal force of the inner inclined steel pipe pile and the outer inclined steel pipe pile, designing, and sending parameters to the parameter output submodule;
and the parameter output submodule is used for outputting parameters of the designed inclined steel pipe pile.
9. The system for designing a supporting structure for a slope of a karst mountain land and rock, as set forth in claim 8, wherein the parameters of the slope steel pipe pile include the outer diameter of the steel pipe pile, the wall thickness and the type of steel.
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