CN111441371B - Self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide and design method - Google Patents
Self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide and design method Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 46
- 238000013461 design Methods 0.000 title claims abstract description 36
- 230000001932 seasonal effect Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 238000004146 energy storage Methods 0.000 claims abstract description 49
- 238000004873 anchoring Methods 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 238000001125 extrusion Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 9
- 229910000639 Spring steel Inorganic materials 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000011835 investigation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 description 19
- 238000010257 thawing Methods 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 239000000306 component Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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Abstract
The invention discloses a self-balancing anchor cable structure design method for preventing seasonal frozen soil landslide, which comprises a self-balancing anchor cable structure, wherein the self-balancing anchor cable structure comprises a disc spring energy storage system, a withdrawal clamping sleeve, a safety clamping sleeve, a protective sleeve, steel strands, a wire-erecting ring, a grouting pipe, a bearing conversion plate and a guide cap; the disc spring energy storage system is an energy storage component, so that prestress loss is reduced when the rock-soil body is displaced inwards, and increment of anchor cable axial force is reduced when the rock-soil body is displaced outwards; the disc spring energy storage system is positioned at the left end of the protective sleeve and is connected with a steel strand through an anchor, and the steel strand extends into the protective sleeve and passes through a bearing conversion plate at the left side and is connected with a withdrawal clamping sleeve and a safety clamping sleeve; when the anchor cable structure is used, the prestress can be automatically adjusted according to different working conditions of special rock-soil landslide so as to ensure the effectiveness and durability of an anchoring project; in addition, the design method of the invention is convenient for realizing the design and manufacture of the anchor cable structure.
Description
Technical Field
The invention relates to a design method of a self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide, in addition to a self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide, and belongs to the technical field of landslide control engineering.
Background
The anchor cable structure is used as a core component of the rock-soil anchoring technology, and the stress mode of the grouting body of the fixed section after the anchor cable is stressed can be divided into a tension anchor cable and a pressure anchor cable.
In common landslide prevention measures, the anchor section is embedded into the stabilized rock soil of the sliding bed, the free section is arranged in the middle of the anchor section, and the surface layer is matched with a frame grid beam and other counterforce devices for use, so that the unification of surface layer protection and deep reinforcement can be realized. However, under special working conditions, such as earthquake, repeated deformation of seasonal frozen soil due to frost heaving and thawing, etc., the anchor cable frame structure may fail due to excessive prestress loss or sudden increase of anchoring force. If the maximum pulling force of the anchor rod in the seasonal frozen soil area can reach 2-3 times that before the anchor rod is frozen, the prestress loss is excessive after the anchor rod is melted, and the anchor rod can be frozen and thawed to a local collapse without any sign.
Because the landslide has relatively complex environment, special rock-soil property and complex action mechanism, when the existing frame anchor cable technology is applied to the landslide control, the stability of the slope is often improved by enlarging the cross section size of the frame beam column and the anchor cable or the length of an anchor body.
The application number is: CN201611262415.1, publication No.: the invention patent of CN106522250A discloses a prestress anchoring structure suitable for reinforcing a freeze thawing side slope in a frozen soil area, which comprises a pad pier, wherein the top and the bottom of the left side of the pad pier are respectively provided with a slope, the left side of the pad pier is provided with a steel pad, the left side of the steel pad is provided with a freeze thawing adaptation elastic gasket, the left side of the freeze thawing adaptation elastic gasket is provided with an anchor, the outer sides of the anchor, the freeze thawing adaptation elastic gasket and the steel pad are sleeved with a protective shell, the right side of the pad pier is provided with a broken stone anti-freezing layer, and the right side of the broken stone anti-freezing layer is provided with a self-taking section. According to the invention, the elastic washer and the broken stone anti-freezing layer are adapted to freeze thawing, so that the anchor cable can be prevented from deforming when in use; however, when the anchoring structure is used, the purpose of preventing the anchor cable from deforming is realized through the elastic washer and the steel backing plate, and the effect of automatically adjusting the prestress is poor; meanwhile, the stroke is too small, and the prestress range is adjusted.
Therefore, a novel anchor cable structure which can adapt to different working conditions of seasonal frozen soil landslide and can automatically adjust prestress is urgently needed to be researched.
Disclosure of Invention
The invention aims to overcome the defect that an anchor cable in the prior art cannot adapt to different working conditions of a seasonal frozen soil landslide to automatically adjust prestress, and provides a self-balancing anchor cable structure design method for preventing and controlling the seasonal frozen soil landslide, wherein the anchor cable structure can automatically adjust prestress according to different working conditions (seasonal frozen soil frost heaving and thawing state) of a special rock-soil landslide when in use so as to ensure the effectiveness and durability of an anchoring project;
In addition, the design method of the self-balancing anchor cable structure for preventing seasonal frozen soil landslide is convenient for realizing the design and manufacture of the anchor cable structure.
In order to solve the technical problems, the invention adopts the following technical scheme:
the basic concept of the invention is as follows:
The invention mainly comprises a disc spring energy storage system, a withdrawal clamping sleeve, a safety clamping sleeve, a protective sleeve, a steel strand, a wire loop, a grouting pipe and a guide cap.
The disc spring energy storage system mainly comprises disc spring components formed by overlapping, involution and combination, and the effective load, the limit load, the effective stroke and the limit stroke of the disc spring energy storage system are designed according to the parameter index requirements of the anchor cable; the main function of the device is energy storage, and the prestress loss is reduced when the rock-soil body generates inward displacement; when the rock-soil body generates displacement outside the slope, the increment of the axial force of the anchor cable is reduced;
the withdrawal clamping sleeve mainly comprises an extrusion sleeve and a special spring steel wire, and the initial withdrawal pressure can be set as required;
the safety clamping sleeve mainly comprises a special extrusion sleeve, the clamping sleeve is tightly contacted with the steel strand, and the steel strand cannot slip before being broken;
the protective sleeve is mainly formed by sealing a bottom plate by a cylindrical shell and is used for protecting the withdrawal clamping sleeve and the safety clamping sleeve;
The steel stranded wires, the wire rings, the grouting pipes and the guide caps are manufactured according to the traditional anchor cable manufacturing mode.
The specific scheme of the invention is as follows:
A self-balancing anchor cable structure for preventing seasonal frozen soil landslide comprises a disc spring energy storage system, a withdrawal clamping sleeve, a safety clamping sleeve, a protective sleeve, a steel strand, a wire-erecting ring, a grouting pipe, a bearing conversion plate and a guide cap; the protective sleeve comprises a shell with a cylindrical structure and a bottom sealing plate connected to the bottom of the shell; the protection sleeve forms a free section of the anchor cable structure, one end of the steel strand is connected with a guide cap at the end after being connected through a plurality of wire-setting rings, and the steel strand, the wire-setting rings and the guide cap form an anchoring section of the anchor cable structure; the bearing conversion plates are arranged in the protective sleeve, two bearing conversion plates are arranged, and the bearing conversion plates are connected through the connecting part; the steel strand of the anchoring section passes through the load-bearing conversion plate on the right side of the sealing bottom plate in sequence and then is tightly connected with a safety clamping sleeve at the end part of the steel strand; the disc spring energy storage system is an energy storage component, so that prestress loss is reduced when the rock-soil body is displaced inwards, and increment of anchor cable axial force is reduced when the rock-soil body is displaced outwards; the disc spring energy storage system is positioned at the left end of the protective sleeve and is connected with a steel strand through an anchor, and the steel strand extends into the protective sleeve and passes through the bearing conversion plate at the left side and is connected with a withdrawal clamping sleeve and a safety clamping sleeve; after the grouting pipe passes through the side wall of the protective sleeve and the left and right bearing conversion plates, the end part of the grouting pipe extends to the bottom of the anchoring section.
Further optimizing, the disc spring energy storage system mainly comprises single disc springs in a superposition and involution mode.
In the invention, the withdrawal clamping sleeve mainly comprises an extrusion sleeve and a spring steel wire, and the initial withdrawal pressure of the withdrawal clamping sleeve can be set as required.
The safety clamping sleeve comprises an extrusion sleeve, and the extrusion sleeve is tightly connected with the steel strand.
The invention also discloses a self-balancing anchor cable structure design method for preventing seasonal frozen soil landslide, which specifically comprises the following steps:
Step 1: performing landslide investigation, finding out landslide lithology and deformation quantity which possibly occurs under various working conditions and is directed to the inside and the outside of the slope, and designing the length and tonnage of an anchor cable;
Step 2: after the step 1 is completed, designing the effective load, limit load, effective stroke, limit stroke and equivalent elastic coefficient of the disc spring energy storage system;
step 3: according to the result of the step 2, referring to a mechanical handbook, and according to the effective load, the limit load, the effective stroke, the limit stroke and the equivalent elastic coefficient of the disc spring energy storage system, carrying out disc spring structural design;
Step 4: designing a safety clamping sleeve and a withdrawal clamping sleeve according to the limit load and the limit stroke; when the anchoring force of earthquake or large deformation is larger than the design yield force N 1, the withdrawal clamping sleeve plays a role in maintaining the working anchoring force N 0.
Further, the specific procedure of step 2 is as follows,
For the tensioning locking state, an anchor is taken as a research object, and the mechanical balance state is as follows:
Wherein, E-steel strand elastic modulus; l-free length of steel strand; delta l-elongation of the steel strand in the tensioning process; n-number of steel strands; s-steel strand effective area; equivalent elastic coefficient of the k-disc spring energy storage system; x 0 -compression amount of the disc spring energy storage system in the tensioning process;
When the displacement generated by landslide is x, the displacement increment delta x 2 of the disc spring energy storage system is set relative to the displacement increment delta x 1 of the anchor cable in the locking state, and the displacement obviously meets the following conditions:
Δx1+Δx2＝x (2)
at this time, the anchor is taken as a research object, and the mechanical balance state is as follows:
the equivalent elastic coefficient of the disc spring energy storage system can be deduced by the combined formula (1), the formula (2) and the formula (3).
The larger x/Deltax 1 is, the smaller the displacement generated by landslide is transmitted to the self-balancing anchor cable, the smaller the equivalent elastic coefficient of the disc spring energy storage system is required, and the minimum change of the internal force of the anchor cable is achieved.
Compared with the prior art, the invention has the following beneficial effects:
When the invention is actually used, the prestress can be automatically regulated according to different working conditions (seasonal frozen soil frost heaving and thawing settlement) of special rock-soil mass landslide so as to ensure the effectiveness and durability of the anchoring engineering; and has better anti-seismic performance.
More importantly, in actual use, when landslide large deformation occurs, the disc spring energy storage system can cooperate with the withdrawal clamping sleeve, so that the deformation resistance and the earthquake resistance of the anchor cable structure are improved, and the effectiveness and the durability of an anchoring project are further ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the overall structure state of the invention under the frost heaving effect.
Fig. 3 is a schematic view of the overall structure state of the invention in case of large deformation of landslide.
Fig. 4 is a diagram showing the mechanism of action of the present invention in actual use with a conventional anchor cable construction.
Reference numerals: 1a disc spring energy storage system, 2a grouting pipe, 3a protective sleeve and 4 a withdrawal clamping sleeve; the safety clamping sleeve 5, the sealing bottom plate 6, the steel strand 7, the anchor 8, the 9-frame wire ring, the guide cap 10, the bearing conversion plate 11, the free section 12 and the anchoring section 13.
Detailed Description
The present invention is further described below in conjunction with embodiments, which are merely some, but not all embodiments of the present invention. Based on the embodiments of the present invention, other embodiments that may be used by those of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
Example 1
The embodiment discloses a self-balancing anchor cable structure design method for preventing seasonal frozen soil landslide, which is provided with a self-balancing anchor cable structure, wherein the self-balancing anchor cable structure comprises a disc spring energy storage system 1, a withdrawal clamping sleeve 4, a safety clamping sleeve 5, a protective sleeve 3, a steel strand 7, a wire-erecting ring 9, a grouting pipe 2, a bearing conversion plate 11 and a guide cap 10;
the protective sleeve 3 comprises a shell with a cylindrical structure and a bottom sealing plate 6 connected to the bottom of the shell;
the protection sleeve 3 forms a free section 12 of the anchor cable structure, one end of the steel stranded wire 7 is connected with a guide cap 10 at the end after being connected by a plurality of wire loops 9, the steel stranded wire 7, the wire loops 9 and the guide cap 10 form an anchoring section 13 of the anchor cable structure, and in the embodiment, two wire loops 9 are arranged;
The bearing conversion plates 11 are arranged in the protective sleeve 3, two bearing conversion plates 11 are arranged, and the bearing conversion plates 11 are connected through a connecting part;
The steel strand 7 of the anchoring section 13 sequentially passes through the sealing bottom plate 6 and the right bearing conversion plate 11 and then is tightly connected with a safety clamping sleeve 5 at the end part of the steel strand 7;
the disc spring energy storage system 1 is an energy storage component, reduces prestress loss when the rock-soil body generates inward displacement, and reduces increment of anchor cable axial force when the rock-soil body generates outward displacement; the disc spring energy storage system 1 is positioned at the left end of the protective sleeve 3 and is connected with a steel strand 7 through an anchor device 8, and the steel strand 7 extends into the protective sleeve 3 and passes through a force-bearing conversion plate 11 at the left side and is connected with a withdrawal clamping sleeve 4 and a safety clamping sleeve 5;
After the grouting pipe 2 passes through the side wall of the protective sleeve 3 and the left and right bearing conversion plates 11, the end part of the grouting pipe 2 extends to the bottom of the anchoring section 13; i.e. the end of the grouting pipe 2 extends to the guiding cap.
In this embodiment, the disc spring energy storage system 1 is mainly composed of single disc springs in a superimposed and involuted manner.
The withdrawing clamp sleeve 4 mainly comprises an extrusion sleeve and a spring steel wire, wherein the spring steel wire can be a spring, and the initial withdrawing pressure of the withdrawing clamp sleeve 4 can be set as required; the structure is as follows: the inner diameter of the extrusion sleeve is larger than the outer diameter of the steel strand 7, the spring is positioned between the steel strand 7 and the extrusion sleeve, the extrusion sleeve is tightly attached to the spring and the steel strand 7 during extrusion, and the spring is extruded during movement of the steel strand 7.
The safety clamping sleeve 5 comprises an extrusion sleeve, and the extrusion sleeve is tightly connected with the steel strand 7.
In the present embodiment, the number of the steel strands 7 in the free section 12 and the anchor section 03 is the same.
The invention is further described below with reference to a design method of a self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide:
The self-balancing anchor cable structure design method for preventing and controlling seasonal frozen soil landslide specifically comprises the following steps:
Step 1: performing landslide investigation, finding out landslide lithology and deformation quantity which possibly occurs under various working conditions and is directed to the inside and the outside of the slope, and designing the length and tonnage of an anchor cable;
Step 2: after the step 1 is completed, designing the equivalent elastic coefficient of the disc spring energy storage system 1, namely the effective load, the limit load, the effective stroke, the limit stroke and the disc spring energy storage system;
Step 3: according to the result of the step 2, referring to the mechanical handbook, and according to the effective load, the limit load, the effective stroke, the limit stroke and the equivalent elastic coefficient of the disc spring energy storage system 1, carrying out the disc spring structural design;
Step 4: designing a safety clamping sleeve 5 and a withdrawal clamping sleeve 4 according to the limit load and the limit stroke; when the earthquake or large deformation action anchoring force is larger than the design yield force N 1, the withdrawal clamp sleeve 4 plays a role in maintaining the working anchoring force N 0.
Wherein, the specific process of the step 2 is as follows,
For the tensioning and locking state, the anchor 8 is taken as a research object, and the mechanical balance state is as follows:
wherein, the E-steel strand 7 has elastic modulus; l-length of free section 12 of steel strand 7; elongation of the steel strand 7 in the Deltal-stretching process; n-number of steel strands 7; s-steel strand 7 effective area; equivalent elastic coefficient of the k-disc spring energy storage system; x 0 -compression amount of the disc spring energy storage system in the tensioning process;
When the displacement generated by landslide is x, the displacement increment delta x 2 of the disc spring energy storage system is set relative to the displacement increment delta x 1 of the anchor cable in the locking state, and the displacement obviously meets the following conditions:
Δx1+Δx2＝x (2)
at this time, the anchor 8 is taken as a research object, and the mechanical balance state is as follows:
the equivalent elastic coefficient of the disc spring energy storage system can be deduced by the combined formula (1), the formula (2) and the formula (3).
The larger x/Deltax 1 is, the smaller the displacement generated by landslide is transmitted to the self-balancing anchor cable, the smaller the equivalent elastic coefficient of the disc spring energy storage system is required, and the minimum change of the internal force of the anchor cable is achieved.
The invention is further described below with reference to specific control examples of specific frozen soil landslide:
The implementation object is as follows: a certain seasonal frozen soil landslide;
Specific conditions of the implementation object: the plane shape is tongue-shaped, the slope direction is 325 degrees, the length is 350m, the width is 200m, the land embedding depth is 15 m-18 m, the mass of the sliding body is fourth-series residual (Q4 el) clay, the thickness of seasonal frozen soil is about 2.2m, and the free frost heave rate is 4%. Under the constraint condition, the maximum value of frost heaving, thawing, sinking and deforming of the landslide is about 30mm, the sliding bed is relatively stable mudstone, and the sliding surface is a basal interface.
The landslide is to be treated by adopting lattice anchor cable engineering, the tonnage of the anchor cable is 400kN, 4 steel strands 7 are adopted for the anchor cable, the length of the free section 12 of the anchor cable is 20m, according to calculation, if the traditional anchor cable is adopted, when the frost heave deformation is 40mm, the frost heave force 168KN can be generated, and the anchor cable and the frame can be damaged; when the deformation is melted and sunk for 40mm, 168KN of prestress loss can be generated, the prestress loss of the anchor cable is larger, and landslide prevention and control engineering can be invalid.
Therefore, a self-balancing anchor cable structure suitable for preventing and controlling seasonal frozen soil landslide is adopted.
In particular implementation of the embodiments step (a) the following are provided:
S1: the design targets are set as follows: x/deltax 1 =2, namely when the displacement generated by landslide is transmitted to the anchor cable, the displacement is attenuated by half, namely when the frost heaving deformation is 30mm under the extreme working condition, the frost heaving force is only 84KN; when the deformation is carried out by 30mm under the extreme working condition, only 84KN of prestress loss is generated;
s2: calculating the equivalent elastic coefficient of the self-balancing anchor cable disc spring energy storage system; according to different working states of the anchor cable, the effective load of the disc spring energy storage system 1 is set to be 400kN, the limit load is set to be 550kN, the displacement corresponding to the effective load is set to be 30mm, and the limit displacement is set to be 60mm;
S3: according to the S1 result, the structural design of the disc spring energy storage system 1 is carried out according to the mechanical manual, and finally, the disc spring outer diameter is 250mm, the inner diameter is 112mm, the thickness is 12mm, the free height is 19.4mm, and the matching mode is as follows: 2 sheets are overlapped and then involuted, and 18 disc rings are needed;
S4: setting the rated working load of the withdrawal clamping sleeve 4 to be 500kN, namely, when the anchor cable is larger than 500kN, the withdrawal clamping sleeve 4 plays a role;
s5: according to the design, a disc spring energy storage system 1 is manufactured, and is formed by overlapping and involuting single disc rings;
S6: manufacturing a protection sleeve 3 and a bottom sealing plate 6 according to design specifications, and manufacturing a bearing conversion plate 11;
S7: according to the design specification, the withdrawal clamping sleeve 4 is manufactured and consists of an extrusion sleeve and an internal spring (spring steel wire), and the structure is as follows: the inner diameter of the extrusion sleeve is larger than the outer diameter of the steel strand 7, the spring is positioned between the steel strand 7 and the extrusion sleeve, and the extrusion sleeve is tightly attached to the spring and the steel strand 7 during extrusion; manufacturing a safety cutting sleeve 5, wherein the safety cutting sleeve is tightly contacted with the steel stranded wire 7, and the safety cutting sleeve cannot slip before the steel stranded wire 7 is broken;
S8: assembling a self-balancing anchor cable structure according to the anchor cable structure schematic diagram; firstly, a disc spring energy storage system 1, a withdrawal clamping sleeve 4 and a protective sleeve 3 are assembled, and a steel strand 7, a wire-setting ring 9, a grouting pipe 2 and a guide cap 10 are manufactured according to the traditional anchor cable manufacturing mode;
s9: setting up bent frames according to related construction specifications, and drilling according to the aperture and the hole depth required by design;
S10: the assembled self-balancing anchor cable structure is put into a drill hole;
s11: grouting according to related construction specifications, and protecting the orifice;
s12: after the strength of the slurry meets the design requirement, each steel strand 7 is pretensioned firstly, so that the steel strands are uniformly stressed, and the phenomenon of eccentric tension or uneven stress is avoided. And then carrying out tensioning locking of the anchor cable according to the designed anchoring force.
Referring to fig. 4, in fig. 4, a broken line represents a conventional anchor cable, and a solid line represents an intelligent anchor cable, that is, the anchor cable structure of the present invention. The rated working anchoring force is N 0, and under the working condition that the landslide generates deformation pointing to the interior of the slope (frozen soil thawing sinking), the disc spring energy storage system 1 plays a role in compensating the prestress loss caused by the displacement pointing to the interior of the slope; when the landslide generates deformation pointing to the outside of the landslide (frozen soil frost heaving) and the anchoring force is smaller than the design yield force N 1, the disc spring energy storage system 1 plays a role, so that the prestress increment is greatly reduced; when the anchoring force of earthquake or large deformation is larger than the design yield force N 1, the withdrawal clamping sleeve 4 plays a role, so that the anchoring force N 0 is maintained not to be increased sharply, and the effectiveness of the anchor cable engineering under the extreme working condition is maintained.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. A self-balancing anchor cable structure design method for preventing seasonal frozen soil landslide is characterized in that: the self-balancing anchor cable structure comprises a disc spring energy storage system, a withdrawal clamping sleeve, a safety clamping sleeve, a protective sleeve, a steel strand, a wire loop, a grouting pipe, a bearing conversion plate and a guide cap;
the protective sleeve comprises a shell with a cylindrical structure and a bottom sealing plate connected to the bottom of the shell;
The protection sleeve forms a free section of the anchor cable structure, one end of the steel strand is connected with a guide cap at the end after being connected through a plurality of wire-setting rings, and the steel strand, the wire-setting rings and the guide cap form an anchoring section of the anchor cable structure;
the bearing conversion plates are arranged in the protective sleeve, two bearing conversion plates are arranged, and the bearing conversion plates are connected through the connecting part;
The steel strand of the anchoring section passes through the load-bearing conversion plate on the right side of the sealing bottom plate in sequence and then is tightly connected with a safety clamping sleeve at the end part of the steel strand;
The disc spring energy storage system is an energy storage component, so that prestress loss is reduced when the rock-soil body is displaced inwards, and increment of anchor cable axial force is reduced when the rock-soil body is displaced outwards; the disc spring energy storage system is positioned at the left end of the protective sleeve and is connected with a steel strand through an anchor, and the steel strand extends into the protective sleeve and passes through the bearing conversion plate at the left side and is connected with a withdrawal clamping sleeve and a safety clamping sleeve;
the grouting pipe end extends to the bottom of the anchoring section after penetrating through the side wall of the protective sleeve and the left and right bearing conversion plates;
The self-balancing anchor cable structure design method for preventing and controlling seasonal frozen soil landslide comprises the following steps:
Step 1: performing landslide investigation, finding out landslide lithology and deformation quantity which possibly occurs under various working conditions and is directed to the inside and the outside of the slope, and designing the length and tonnage of an anchor cable;
Step 2: after the step 1 is completed, designing the effective load, limit load, effective stroke, limit stroke and equivalent elastic coefficient of the disc spring energy storage system;
step 3: according to the result of the step 2, referring to a mechanical handbook, and according to the effective load, the limit load, the effective stroke, the limit stroke and the equivalent elastic coefficient of the disc spring energy storage system, carrying out disc spring structural design;
Step 4: designing a safety clamping sleeve and a withdrawal clamping sleeve according to the limit load and the limit stroke; when the anchoring force of earthquake or large deformation is larger than the design yield force N 1, the withdrawal clamping sleeve plays a role in maintaining the working anchoring force N 0.
2. The self-balancing anchor cable structure design method for preventing and controlling seasonal frozen soil landslide of claim 1, wherein the self-balancing anchor cable structure design method comprises the following steps: the disc spring energy storage system is mainly composed of single disc springs in a superposition and involution mode.
3. The self-balancing anchor cable structure design method for preventing and controlling seasonal frozen soil landslide of claim 1, wherein the self-balancing anchor cable structure design method comprises the following steps: the withdrawal clamping sleeve mainly comprises an extrusion sleeve and a spring steel wire, and the initial withdrawal pressure of the withdrawal clamping sleeve can be set as required.
4. The self-balancing anchor cable structure design method for preventing and controlling seasonal frozen soil landslide of claim 1, wherein the self-balancing anchor cable structure design method comprises the following steps: the safety cutting ferrule includes extrusion cover, extrusion cover and steel strand wires zonulae occludens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010284916.XA CN111441371B (en) | 2020-04-13 | 2020-04-13 | Self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide and design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010284916.XA CN111441371B (en) | 2020-04-13 | 2020-04-13 | Self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide and design method |
Publications (2)
| Publication Number | Publication Date |
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| CN111441371A CN111441371A (en) | 2020-07-24 |
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