CN110887953A - Continuous adjustable approximate-arc differential settlement mechanical device in geotechnical centrifuge model - Google Patents
Continuous adjustable approximate-arc differential settlement mechanical device in geotechnical centrifuge model Download PDFInfo
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Abstract
The utility model provides a continuous adjustable nearly arc differential settlement mechanical device among geotechnical centrifuge model which characterized by: the bottom of the model box is provided with a left steel plate platform, a right steel plate platform and an edge steel plate platform which have the same height and the same length as the inner length of the model box, the top surfaces of the left steel plate platform and the right steel plate platform extend inwards and form a chamfer with a wide top and a narrow bottom, the left steel plate platform and the right steel plate platform are separated by a certain distance to simulate an uneven settlement area, a cavity is formed between the lower part of the cavity and the bottom of the model box, a micro servo lifting motor is arranged in the cavity, a movable supporting platform is welded on the micro servo lifting motor, a plurality of steel strips with smaller width and length equal to the length in the model box are arranged above the model box, the thin steel wire ropes are connected with the steel strip groups in a penetrating way, the adjacent steel strips in the groups are in close contact, the upper surface of the steel strip group and the upper surface of the steel plate platform are positioned on the same horizontal plane in the initial stage, and a soil slope model is arranged above the steel plate platform and the steel strips in the model box.
Description
Technical Field
The invention relates to control equipment for simulating uneven settlement of a deep foundation, in particular to a mechanical device and a method for continuously and approximately adjusting arc-shaped uneven settlement in a geotechnical centrifuge model.
Background
The method is characterized in that large-area or local non-uniform settlement areas are easily formed at deep or shallow parts of rock-soil layers by long-time high-intensity mining of fossil fuels, excavation of large-section tunnels, excessive extraction of underground water, fault structures, karst limestone, insufficient compaction of foundation backfill soil, biological decomposition of garbage dumps and the like. Under the leading action of gravity, the uneven settlement area is gradually transmitted to an upper covering layer, and finally geological disasters such as ground surface settlement, ground collapse, slope collapse, landslide and the like can be caused, so that the normal use of nearby buildings and the life safety of residents are seriously threatened. Therefore, the mechanical device for simulating differential settlement in the deep stratum is developed, the transfer rule of differential deformation to the upper rock-soil layer and the surface deformation characteristic caused by the differential deformation are explored, and the targeted control and management are carried out, so that the mechanical device has important academic value and engineering reference significance.
In view of the above problems, a large number of domestic and foreign researchers developed corresponding ground differential settlement devices and conducted highly effective research on differential settlement, such as Stone, (Stone K J L. modeling of traffic settlement soil solids [ D ]. University of Cambridge,1988) Chen Hu et al, (Chen Hu, Luo Qiang, Mengwei Geotechnical centrifuge embankment foundation deflection type differential settlement control device development and test [ J ] experimental technique and management, 2013,30(12):96-100) and Divya et al (Divya P V, Viswanaham B V S, Gourc J P. central foundation model concrete crystals-Correlation of Geofiber-Reinforced Clay-Based land coatings [ J ] Journal of geographic engineering 35143, 2016) (2016). However, it was found by on-site monitoring that the deep differential settlement of the formation is usually in the form of an arc or a semi-ellipse and the deformation amplitude is large in a short time and the slow deformation state is in a later period by the Wangzhe road (Wangzhe way, Shanghai subway shield tunnel longitudinal deformation analysis [ J ]. Underground engineering and tunnel, 2009, (4):1-6) and Shen et al (Shen S L, Wu H N, Cui Y J, et al. Although the semi-elliptical shape or the arc shape is very close to the field working condition, the research of the uneven settling equipment by scholars at home and abroad is only rarely reported.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a continuously adjustable approximate arc-shaped uneven settlement mechanical device in a geotechnical centrifuge model, because the gravity of a rock-soil body plays a leading role in the upward transfer process of uneven settlement, the device has the advantage of reproducing prototype stress by combining with a geotechnical centrifuge model test, and near arc-shaped uneven settlement equipment for realizing accurate control in an ultragravity field is developed, so that the device has very important significance for reasonably exploring the surface deformation destruction characteristic under the actual uneven settlement working condition.
In order to achieve the purpose, the invention adopts the technical scheme that:
a continuously adjustable approximate arc-shaped uneven settlement mechanical device in a geotechnical centrifuge model comprises a model box 1, wherein a left steel plate platform 3, a right steel plate platform 4 and an edge steel plate platform 5 which are equal in height and length are arranged at the bottom of the model box 1, the left steel plate platform 3, the right steel plate platform 4 and the edge steel plate platform 5 are equal in height and length and are equal in length in the model box 1, the edge steel plate platform 5 is positioned at the left side of the left steel plate platform 3 or the right side of the right steel plate platform 4, the top surface of the left steel plate platform 3 extends rightwards, the top surface of the right steel plate platform 4 extends leftwards, the two parts extend at a certain distance to simulate uneven settlement range, a cavity is formed between the edge steel plate platform and the bottom of the model box 1, a miniature servo lifting motor 6 is installed in the cavity, a steel plate is welded above the miniature servo lifting motor 6 to, a plurality of steel strips 9 with the length equal to the length in the model box 1 are arranged above the movable supporting platform 62 and are divided into a left steel strip group 91 and a right steel strip group 92, the upper surface of the movable supporting platform 62 is in seamless close contact with but not connected with the lower surface of the steel strips 9, a left steel wire rope 81 is connected with a left steel plate platform 3 and the left steel strip group 91 in a penetrating way, a right steel wire rope 82 is connected with a right steel plate platform 4 and the right steel strip group 92 in a penetrating way, and adjacent steel strips in the groups are in close contact, the left-side wire rope 81 and the right-side wire rope 82 are placed in a generally horizontal state when not under tension, a shielding thin steel strip 10 is placed over the steel strip 9 near the common boundary of the left-side steel strip group 91 and the right-side steel strip group 92, and a soil slope model 2 is arranged in the model box 1 above the left steel plate platform 3, the right steel plate platform 4, the edge steel plate platform 5, the steel plate strips 9 and the shielding thin steel plate strips 10. The upper surface of the steel plate strip 9 and the upper surfaces of the left steel plate platform 3, the right steel plate platform 4 and the edge steel plate platform 5 are all in the same horizontal plane in the initial stage.
Preferably, the lifting shaft of the micro servo lifting motor 6 is composed of a trapezoidal thread screw 61, and the movable support platform 62 is welded above the trapezoidal thread screw 61.
The left steel plate platform 3, the right steel plate platform 4 and the edge steel plate platform 5 are respectively provided with two steel plate feet, the edge steel plate platform 5 is of an n-shaped structure, a left steel plate platform chamfer 31 is formed at the rightmost side of the top surface of the left steel plate platform 3, a right steel plate platform chamfer 41 is formed at the leftmost side of the top surface of the right steel plate platform 4, and the left steel plate platform chamfer 31 and the right steel plate platform chamfer 41 are used for providing a constraint for the displacement of the steel plate strips 9; the narrow space that is used for placing the steel strip 9 down of broad is formed between the top surface of left side steel sheet platform 3 and the top surface of right side steel sheet platform 4, wherein the leftmost of steel strip 9 contacts with the border of left side steel sheet platform chamfer 31, and the rightmost side contacts with the border of right side steel sheet platform chamfer 41, and the thickness of steel strip 9 equals the top surface thickness of left side steel sheet platform 3 and right side steel sheet platform 4.
The miniature servo lifting motor 6 is connected with a movable supporting platform 62 through a trapezoidal thread screw rod 61 with a self-locking function, the movable supporting platform 62 is one of constraints of uneven deformation, the miniature servo lifting motor 6 is connected with a PC (personal computer) of a control room through a centrifuge sliding ring, and the starting, pausing and lifting rates of the motor can be accurately regulated and controlled in real time through a control software system on the PC.
A left steel plate strip group horizontal hole penetrating along the width direction is formed in the left steel plate strip group 91, a right steel plate strip group horizontal hole penetrating along the width direction is formed in the right steel plate strip group 92, the left steel plate strip group horizontal hole and the right steel plate strip group horizontal hole are not in the same straight line, a left steel plate platform horizontal hole 32 and a left steel plate platform vertical hole 33 penetrating through each other are formed in the left steel plate platform 3, a right steel plate platform horizontal hole 42 and a right steel plate platform vertical hole 43 penetrating through each other are formed in the right steel plate platform 4, the left steel plate platform horizontal hole 32 and the left steel plate strip group horizontal hole are in the same straight line and penetrate through each other, the right steel plate platform horizontal hole 42 and the right steel plate strip group horizontal hole are in the same straight line and penetrate through each other, a left steel wire rope 81 passes through the left steel plate platform vertical hole 33, the left steel plate platform horizontal hole 32 and the left steel plate group horizontal hole, two ends of the steel wire rope are fixed by a first single-hole screw thread locking device 71 and a second single-hole screw thread locking device 72 respectively, a right steel wire rope 82 penetrates through a right steel plate platform vertical hole 43, a right steel plate platform horizontal hole 42 and a right steel plate strip group horizontal hole, two ends of the steel wire rope are fixed by a third single-hole screw thread locking device 73 and a fourth single-hole screw thread locking device 74 respectively, and a left steel wire rope 81 and a right steel wire rope 82 are third constraints of uneven deformation.
The second single-hole screw thread locking device 72 and the third single-hole screw thread locking device 73 are positioned in a gap between the left steel strip group 91 and the right steel strip group 92, and a shielding thin steel strip 10 is arranged above the gap; the first single-hole screw thread locking device 71 is located below the vertical hole 33 of the left steel plate platform, and the fourth single-hole screw thread locking device 74 is located below the vertical hole 43 of the right steel plate platform.
Along length direction, left side steel sheet strip group horizontal hole and right side steel sheet strip group horizontal hole have the multiunit respectively, respectively are equidistant form and distribute, correspondingly, left side steel sheet platform horizontal hole 32 and left side steel sheet platform vertical hole 33 and right side steel sheet platform horizontal hole 42 and right side steel sheet platform vertical hole 43 also have the multiunit, and every group left side steel sheet platform horizontal hole 32 link up on same straight line with a set of left side steel sheet strip group horizontal hole, and every group right side steel sheet platform horizontal hole 42 link up on same straight line with a set of right side steel sheet strip group horizontal hole.
Compared with the prior art, the invention has the beneficial effects that:
(1) the near-arc-shaped differential settlement equipment in the centrifugal model test is skillfully and simply obtained by utilizing the integral rigidity and the individual flexible movement characteristic of the thin steel plate strip and combining the better flexibility of the thin steel wire rope, and the actual differential settlement working condition is reasonably reproduced.
(2) Different stages and different types of settlement working conditions can be simulated by changing the size of the chamfer, the displacement of the movable supporting platform and the total width of the thin steel plate strip.
(3) The micro motor is remotely controlled by inputting a programmed program into a PC (personal computer) and the self-locking function of the trapezoidal thread screw rod is combined, so that the real-time accurate control of the near-arc-shaped uneven settlement mode, the settlement amount and the settlement rate can be realized in a high gravity field.
(4) The n-shaped steel plate platforms can be alternately placed on the left side and the right side of the model to simulate the settlement conditions of different positions under the slope.
(5) The mechanical equipment device has the advantages of simple and clear structure, low cost, easy operation, short test process time and high efficiency, and is also suitable for the test under the gravity of 1 g.
Drawings
Fig. 1 is a side view of a continuously adjustable arc-shaped differential settlement mechanical device in a geotechnical centrifuge model.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a detailed dimension side view of a continuously adjustable arc-shaped differential settlement mechanical device in a geotechnical centrifuge model.
Fig. 4 is a schematic diagram of the application of the near-arc differential settlement mechanism (small holes are not marked due to simplification).
In the figure: the device comprises a model box 1, a soil slope model 2, a left steel plate platform 3, a right steel plate platform 4, an edge steel plate platform 5, a miniature servo lifting motor 6, a single-hole screw thread locking device 7, a steel wire rope 8, a steel plate strip 9, a shielding thin steel plate strip 10 and a laser displacement sensor 11, wherein the model box is a soil slope model; 31. 32 and 33 are a left steel plate platform chamfer, a left steel plate platform horizontal hole and a left steel plate platform vertical hole respectively; 41. 42 and 43 are respectively a right steel plate platform chamfer, a right steel plate platform horizontal hole and a right steel plate platform vertical hole; 61 is a trapezoidal thread screw rod, and 62 is a movable supporting platform; 71. 72, 73 and 74 are a single-hole screw thread locking device I, a single-hole screw thread locking device II, a single-hole screw thread locking device III and a single-hole screw thread locking device IV which are sequentially arranged; 81. 82 are respectively a left steel wire rope and a right steel wire rope; 91. 92 are respectively a left side thin steel plate strip group and a right side thin steel plate strip group; 321 and 331 are the first horizontal and vertical holes of the left steel plate platform, respectively; 421 and 431 are the first horizontal and vertical holes of the right steel plate platform, respectively; 711. 721, 731 and 741 are the first single-hole screw lockers in each row; 811. 821 is a first thin steel wire rope on the left side and the right side respectively; 9101 to 9119, 9201 to 9219 are the serial numbers of the single thin steel plate strips on the left and right sides respectively; 9101-1, 9102-1, … … 9119-1 and 9201-1, 9202-1 … … 9219-1 are the first horizontal hole numbers on the single thin steel plate strip on the left and right sides respectively.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples. For the sake of neatness of the drawing, each main structure is simplified and shown by lines.
As shown in the figures 1, 2 and 3, the continuous adjustable approximate arc-shaped uneven settlement mechanical device in the geotechnical centrifuge model comprises a model box 1, wherein the model box 1 can adopt an aluminum cuboid box structure, and a left steel plate platform 3, a right steel plate platform 4 and an edge steel plate platform 5 which are the same in height are arranged at the bottom in the box, wherein each steel plate platform is provided with two steel plate feet, the width of each steel plate foot is 10mm, the height of each steel plate foot is 200mm, the steel plate feet are all made of A-type carbon steel, and the thickness of each steel plate platform is 16 mm. The top surface of the left steel plate platform 3 extends rightwards, the top surface of the right steel plate platform 4 extends leftwards, and the two parts extend at a certain distance to simulate the uneven settlement range. The edge steel plate platform 5 is an "n" type structure, and can be located on the left side of the left steel plate platform 3 or on the right side of the right steel plate platform 4, when located on the left side of the left steel plate platform 3, the right side of the right steel plate platform 4 abuts against the inner wall of the mold box 1, and when located on the right side of the right steel plate platform 4, the left side of the left steel plate platform 3 abuts against the inner wall of the mold box 1.
The two extending parts can be cut off a certain angle along the upper top surface at the edge side to form a left steel plate platform chamfer 31 and a right steel plate platform chamfer 41 respectively, the chamfer structure provides one of the constraints of steel plate strip displacement (rotation angle), and the maximum displacement and the range of a settlement area can be calculated. A cavity is formed between the lower part of the extending parts of the left steel plate platform 3 and the right steel plate platform 4 and the upper part of the bottom plate of the model box 1. A micro servo lifting motor 6 is installed in the cavity, a narrow steel plate is welded above the micro servo lifting motor 6 to form a movable supporting platform 62, the two keep consistent in movement, a trapezoidal thread screw rod 61 can be used for connecting the movable supporting platform 62, vertical displacement within a certain range can be achieved, and the self-locking function is achieved. The moving support platform 62 is another constraint of non-uniform deformation and can withstand at least 10kN of gravity above it.
The upper surface of the movable supporting platform 62 and the lower surfaces of the left steel plate platform 3 and the right steel plate platform 4 are located on the same horizontal plane, and the width of the movable supporting platform 62 is larger than the width of an uneven settlement area and smaller than the horizontal distance between the vertical hole 33 of the steel plate platform 3 and the vertical hole 43 of the steel plate platform 4, so that the movable supporting platform 62 is prevented from contacting the single-hole screw thread locking device 7 to cause test errors. A laser displacement sensor 11 for recording displacement at different moments in real time is arranged below the movable supporting platform 62, the measuring range is 30mm, the miniature servo lifting motor 6 can be connected with a PC (personal computer) of a control room through a centrifuge sliding ring, and the starting, pausing and lifting rates of the miniature servo lifting motor 6 can be accurately regulated and controlled in real time through a control software system on the PC.
38 steel slats 9 that the width is 4mm have been placed to removal supporting platform 62 top, divide into about two sets of, and every group is respectively 19, is left side steel slat group 91 and right side steel slat group 92 respectively, comprises steel slat one 9101 ~ steel slat nineteen 9119 in the left side steel slat group 91, and right side steel slat group 92 comprises steel slat twenty 9201 ~ steel slat thirty-eight 9219. The upper surface of the mobile support platform 62 is in seamless intimate contact with the lower surfaces of the two sets of steel strips, but not attached. The left steel plate strip group 91 and the right steel plate strip group 92 are the same as the left steel plate platform 3, the thickness and the length of the right steel plate platform 4 are the same, the thickness and the length are 16mm, but the width is different, 2.5mm horizontal small holes are drilled on the upper parts (the vertical distance from the center to the top surface is 4mm) of the transverse axis direction (namely the width direction) of the two steel plate strip groups respectively, namely the horizontal hole of the left steel plate strip group and the horizontal hole of the right steel plate strip group are formed, the horizontal hole of the left steel plate strip group and the horizontal hole of the right steel plate strip group are just staggered in the longitudinal axis direction (namely the length direction), meanwhile, the left steel plate platform 3 is provided with a left steel plate platform horizontal hole 32 (the vertical distance from the center to the top surface is 4mm, the same below) of 2.5mm diameter and a left steel plate platform vertical hole 33 (the horizontal distance from the center to the bottom end of the chamfer is 12mm, the same below) of 4.0mm diameter, the right steel plate platform 4 is provided with a right steel plate platform horizontal hole 42 Straight hole 43 (the diameter of vertical hole is great is the better 90 degrees directions of commentaries on classics when making things convenient for the wire rope to wear), left side steel sheet platform horizontal hole 32 and left side steel sheet group horizontal hole are located same straight line and link up each other, right side steel sheet platform horizontal hole 42 and right side steel sheet group horizontal hole are located same straight line and link up each other, pass left side steel sheet platform vertical hole 33 with left side wire rope 81 of diameter 1.5mm, left side steel sheet platform horizontal hole 32 and left side steel sheet group horizontal hole, both ends are fixed with haplopore screw locking wire ware one 71 and haplopore screw locking wire ware two 72 respectively, pass right side steel sheet platform vertical hole 43, right side steel sheet platform horizontal hole 42 and right side steel sheet group horizontal hole with right side wire rope 82 of diameter 1.5mm, both ends are fixed with haplopore screw locking wire ware three 73 and haplopore screw locking wire ware four 74 respectively, adjacent steel sheet in the group is in close contact with. In order to increase the test precision, the outlet of the vertical small hole is arranged on the lower surface of the steel plate platform, so that the single-hole wire locker 7 and the steel wire rope 8 are prevented from having secondary disturbance influence on the soil body in the sedimentation process.
Wire rope is uneven deformation's third restraint, and its diameter is 1.5mm, length 124mm, 9 altogether, along 5 on the left of the longitudinal direction, 4 on the right side, the equidistance installation (the certain distance of vertically staggering is followed on the left and right sides, avoids the locking wire ware side by side to reduce the space width in initial little gap, the profile that subsides like this more is close the arc), 2 haplopore screw locking wire wares of every thin wire rope installation are with fixed wire rope's length, haplopore screw locking wire wares 9 pairs altogether, and length and width all are 6mm, and the screw diameter is 3mm, and length is 5 mm.
When the left steel wire rope 81 and the right steel wire rope 82 are not pulled, the steel wire ropes are generally in a horizontal placement state, the upper surface of the steel plate strip 9 and the upper surfaces of the left steel plate platform 3, the right steel plate platform 4 and the edge steel plate platform 5 are all in the same horizontal plane in the initial stage, and a soil slope model is arranged above the left steel plate platform 3, the right steel plate platform 4, the edge steel plate platform 5 and the steel plate strip 9 in the model box 1.
In a more feasible scheme, a plurality of groups of horizontal holes of the left side steel plate strip group and a plurality of groups of horizontal holes of the right side steel plate strip group are respectively distributed in an equidistant mode, for example, in the graph of fig. 1 and 2, a first steel plate strip-horizontal hole 9101-1, a second steel plate strip-horizontal hole 9101-2 and … … are arranged on a first steel plate strip 9101 along the length direction, and a first horizontal hole, namely a horizontal hole, of a first row comprises a first steel plate strip-horizontal hole 9101-1-a nineteen steel plate strip-horizontal hole 9119-1 and a twenty horizontal holes of a steel plate strip 9201-1-a thirty-eight steel plate strip-horizontal hole 9219-1. The horizontal holes in the second row, namely the horizontal holes II, are distributed in a mode like the horizontal holes I.
Correspondingly, there are also a plurality of groups of left steel plate platform horizontal hole 32 and left steel plate platform vertical hole 33 and right steel plate platform horizontal hole 42 and right steel plate platform vertical hole 43, left steel plate platform 3 is provided with left steel plate platform horizontal hole one 321, left steel plate platform horizontal hole two 322, … …, and left steel plate platform vertical hole one 331, left steel plate platform vertical hole two 332, … …, right steel plate platform 4 is provided with right steel plate platform horizontal hole one 421, right steel plate platform horizontal hole two 422, … …, and right steel plate platform vertical hole one 431, right steel plate platform vertical hole two 432, … …, each communicates with steel plate strip horizontal hole on the same straight line according to the figure.
Accordingly, there are a plurality of left wire ropes 81 and right wire ropes 82, i.e., a left wire rope one 811, a left wire rope two 812, … …, and a right wire rope one 821, a right wire rope two 822, … ….
Correspondingly, the single-hole screw thread locking device I71, the single-hole screw thread locking device II 72, the single-hole screw thread locking device III 73 and the single-hole screw thread locking device IV 74 are also multiple, namely, a first row of single-hole screw thread locking device I711, a second row of single-hole screw thread locking device I712, … …, a first row of single-hole screw thread locking device II 721, a second row of single-hole screw thread locking device II 722, … …, a first row of single-hole screw thread locking device III 731, a second row of single-hole screw thread locking device III 732, … …, a first row of single-hole screw thread locking device IV 741, a second row of single-hole screw thread locking device IV 742, … ….
According to the figure, a left steel wire rope 81 sequentially penetrates through a left steel plate platform vertical hole I331, a left steel plate platform horizontal hole I321 and a left steel plate strip group small hole (a steel plate strip horizontal hole I9101-1-a steel plate strip nineteen horizontal hole I9119-1), a left steel plate strip group 91 is connected with a left steel plate platform 3, a right steel plate strip group 92 corresponding to the left steel plate platform is connected with a right steel plate platform 4, and a single steel plate strip in the group is in close contact with the left steel plate platform. At the moment, the left steel wire rope 81 and the right steel wire rope 82 are generally in a horizontal placing state (not pulled), a small gap is reserved between the two steel plate strip groups to place a second single-hole screw thread locking device 72 and a third single-hole screw thread locking device 73, a first single-hole screw thread locking device 71 and a fourth single-hole screw thread locking device 74 are placed on the outlet sides of the vertical hole 33 of the left steel plate platform and the vertical hole 43 of the right steel plate platform to fix the steel wire ropes, a first single-hole screw thread locking device 71 and a second single-hole screw thread locking device 72 fix the left steel wire rope 81, the length of the left steel wire rope 81 is fixed, and meanwhile, a third single-hole screw thread locking device 73 and a fourth single-hole screw thread locking device 74 fix the left steel wire rope 82, the length of the right steel wire rope 82 is fixed, and meanwhile, a shielding thin steel plate strip 10 with the width.
The schematic diagram of the continuously adjustable arc-shaped differential settlement control equipment is shown in figure 4: before the side slope model is manufactured, a trapezoidal thread screw rod 61 of a micro servo motor 6 is positioned in the maximum stroke, a moving support platform 62 connected with the trapezoidal thread screw rod supports a left steel plate strip group 91 and a right steel plate strip group 92 to enable the trapezoidal thread screw rod to be positioned at the same horizontal position with three steel plate platforms, a locking system is used for fixing the position of the trapezoidal thread screw rod 61, a left steel wire rope I811 and a right steel wire rope I821 penetrate through small holes (from the left: 331 to 321 to 9101-1 to 9119-1; from the right: 431 to 421 to 9219-1 to 9201-1), the left steel plate strip group 91 and the right steel plate strip group 92 are respectively connected with a left steel plate platform 3 and a right steel plate platform 4 in a seamless mode, and a horizontal hole 9119-1, 9201-1, a vertical hole 331 of the left steel plate platform 3 and the right steel plate platform 4 penetrate through a small gap area between the left steel plate strip group 91 and, 431, the wire ropes 811 and 821 are fixed at the tail ends of the thin wire ropes 811 and 821 by single-hole screw thread locking devices 711, 721, 731 and 741, the length of the wire ropes 811 and 821 is fixed, the wire ropes 811 and 821 are not subjected to axial tension and are in a horizontal placement state overall, the shielding thin steel plate strip 10 is placed at the common boundary of the left side steel plate strip group 91 and the right side steel plate strip group 92, and a horizontal bottom platform is formed. And then, establishing a soil slope model 2 above the bottom platform, loading the soil slope model in a centrifuge, and after the simulated gravity acceleration reaches the test requirement and is stabilized for a plurality of times, remotely controlling the motor 6 to move downwards slowly through a PC (personal computer) in a control room.
In view of the effect of the high gravity field in the centrifuge, and based on the characteristics of high tensile strength, good flexibility and flexible movement of the thin steel strips 9 of the steel wire rope, the steel wire rope forms a curved arc, the steel strips of the left steel strip group 91 and the right steel strip group 92 descend along with the thin steel wire rope and rotate around the thin steel wire rope for a certain angle, the size of the rotation angle is inversely proportional to the distance between a single steel strip of the left steel strip group 91 and the right steel strip group 92 and the left steel plate platform 3 and the right steel plate platform 4, only a plurality of steel strips in the middle parts of the left steel strip group 91 and the right steel strip group 92 and the micro lifting movable supporting platform 62 keep relative stationary movement in the vertical direction (contact with each other, the rotation angle is close to 0 degree), and further the upper surface of the whole steel strip 9 forms a nearly arc-shaped settlement profile (the steel plate platform chamfers 31 and 41 provide a limited space for the, because the fixed action of wire locking device of the single-hole screw at the two ends of the wire rope, the length of the wire rope is unchanged, but in the bending process of the wire rope, the wire rope is changed from straight to curved, the projection in the horizontal direction is shortened, the gaps in the middle of the left steel plate strip group 91 and the right steel plate strip group 92 are gradually increased, and the soil particles are prevented from falling into the wire rope through the shielding thin steel plate strips 10 arranged above the wire rope, so that the overall continuous arc settling tank is formed (the wire rope is not continuous with steel plate platforms on the two sides due to the rotation of the thin steel plate strips on the left and right sides, and has small gaps, so that the wire rope can be placed to.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that, for those skilled in the relevant art, several modifications can be made without departing from the technical principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (6)
1. A continuously adjustable approximate arc-shaped uneven settlement mechanical device in a geotechnical centrifuge model comprises a model box (1) and is characterized in that a left steel plate platform (3), a right steel plate platform (4) and an edge steel plate platform (5) which are equal in height and length are equal to the inner length of the model box (1) are arranged at the bottom of the model box (1), wherein the edge steel plate platform (5) is positioned at the left side of the left steel plate platform (3) or the right side of the right steel plate platform (4), the top surface of the left steel plate platform (3) extends rightwards, the top surface of the right steel plate platform (4) extends leftwards, the two parts extend at a certain distance to simulate an uneven settlement range, a cavity is formed between the two parts and the bottom of the model box (1), a miniature servo lifting motor (6) is installed in the cavity, a steel plate is welded above the miniature servo lifting motor (6) to form a movable supporting platform (, a laser displacement sensor (11) for recording displacement at different moments in real time is arranged below a movable supporting platform (62), a plurality of steel strips (9) with the length equal to the inner length of a model box (1) are arranged above the movable supporting platform (62) and are divided into a left steel strip group (91) and a right steel strip group (92), the upper surface of the movable supporting platform (62) is in seamless close contact with but not connected with the lower surface of the steel strips (9), a left steel wire rope (81) is connected with the left steel strip group (3) and the left steel strip group (91) in a penetrating way, a right steel wire rope (82) is connected with the right steel strip group (4) and the right steel strip group (92) in a penetrating way, adjacent steel strips in the groups are in close contact with each other, the left steel wire rope (81) and the right steel wire rope (82) are in a horizontal arrangement state when the left steel wire rope (81) and the right steel wire rope (82) are not under tension, a shielding thin steel strip (10) is arranged above the steel strip, and soil slope models (2) are arranged above the left steel plate platform (3), the right steel plate platform (4), the edge steel plate platform (5), the steel plate strip (9) and the shielding thin steel plate strip (10) in the model box (1).
2. The continuous adjustable arc-shaped uneven settlement mechanical device in the geotechnical centrifuge model according to claim 1, wherein the left steel plate platform (3), the right steel plate platform (4) and the edge steel plate platform (5) are all provided with two steel plate feet, the edge steel plate platform (5) is of an n-shaped structure, a left steel plate platform chamfer (31) is formed at the rightmost side of the top surface of the left steel plate platform (3), a right steel plate platform chamfer (41) is formed at the leftmost side of the top surface of the right steel plate platform (4), and the left steel plate platform chamfer (31) and the right steel plate platform chamfer (41) are a constraint for providing the displacement of the steel plate strips (9); a narrow-top and wide-bottom space for placing a steel plate strip (9) is formed between the top surface of the left steel plate platform (3) and the top surface of the right steel plate platform (4), wherein the leftmost side of the steel plate strip (9) is in contact with the edge of the left steel plate platform chamfer (31), the rightmost side of the steel plate strip is in contact with the edge of the right steel plate platform chamfer (41), and the thickness of the steel plate strip (9) is equal to the thickness of the top surfaces of the left steel plate platform (3) and the right steel plate platform (4).
3. The continuous adjustable arc-shaped uneven settlement mechanical device in the geotechnical centrifuge model according to claim 1, wherein the micro servo lifting motor (6) is connected with a movable supporting platform (62) through a trapezoidal thread screw rod (61) with a self-locking function, the movable supporting platform (62) is one of constraints of uneven deformation, the micro servo lifting motor (6) is connected with a PC (personal computer) of a control room through a centrifuge slip ring, and the starting, pausing and lifting speed of the motor can be accurately regulated and controlled in real time through a control software system on the PC.
4. The continuous adjustable arc-shaped uneven settlement mechanical device in the geotechnical centrifuge model according to claim 1, wherein a left steel strip group (91) is provided with a left steel strip group horizontal hole penetrating along the width direction, a right steel strip group horizontal hole penetrating along the width direction is provided on a right steel strip group (92), the left steel strip group horizontal hole and the right steel strip group horizontal hole are not in the same straight line, a left steel platform horizontal hole (32) and a left steel platform vertical hole (33) penetrating each other are provided on the left steel platform (3), a right steel platform horizontal hole (42) and a right steel platform vertical hole (43) penetrating each other are provided on the right steel platform (4), the left steel platform horizontal hole (32) and the left steel strip group horizontal hole are in the same straight line and penetrate each other, the right steel platform horizontal hole (42) and the right steel strip group horizontal hole are in the same straight line and each other The left steel wire rope (81) penetrates through a left steel plate platform vertical hole (33), a left steel plate platform horizontal hole (32) and a left steel plate strip group horizontal hole, two ends of the left steel wire rope are fixed through a single-hole screw thread locking device I (71) and a single-hole screw thread locking device II (72) respectively, a right steel wire rope (82) penetrates through a right steel plate platform vertical hole (43), a right steel plate platform horizontal hole (42) and a right steel plate strip group horizontal hole, two ends of the left steel wire rope are fixed through a single-hole screw thread locking device III (73) and a single-hole screw thread locking device IV (74) respectively, and the left steel wire rope (81) and the right steel wire rope (82) are third constraints of uneven deformation.
5. The continuous adjustable arc-shaped uneven settlement mechanical device in the geotechnical centrifuge model according to claim 4, wherein the second single-hole screw thread locking device (72) and the third single-hole screw thread locking device (73) are located in a gap between the left steel plate strip group (91) and the right steel plate strip group (92), and a shielding thin steel plate strip (10) is arranged above the gap; the single-hole screw thread locking device I (71) is located below a vertical hole (33) of the left steel plate platform, and the single-hole screw thread locking device IV (74) is located below a vertical hole (43) of the right steel plate platform.
6. The continuous adjustable arc uneven settlement mechanical device in the geotechnical centrifuge model according to claim 4, wherein along the length direction, the left steel plate strip group horizontal hole and the right steel plate strip group horizontal hole have multiple groups, which are distributed in an equidistant manner, correspondingly, the left steel plate platform horizontal hole (32), the left steel plate platform vertical hole (33), the right steel plate platform horizontal hole (42) and the right steel plate platform vertical hole (43) also have multiple groups, each group of left steel plate platform horizontal holes (32) and one group of left steel plate strip group horizontal holes are communicated on the same straight line, and each group of right steel plate platform horizontal holes (42) and one group of right steel plate strip group horizontal holes are communicated on the same straight line.
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