CN110777764A - Roadbed ramming influence depth testing device and testing method - Google Patents
Roadbed ramming influence depth testing device and testing method Download PDFInfo
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- CN110777764A CN110777764A CN201911046168.5A CN201911046168A CN110777764A CN 110777764 A CN110777764 A CN 110777764A CN 201911046168 A CN201911046168 A CN 201911046168A CN 110777764 A CN110777764 A CN 110777764A
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention discloses a roadbed ramming influence depth testing device and a roadbed ramming influence depth testing method.A fixing system comprises a top bearing plate, wherein the top bearing plate is sleeved on a fixed supporting cylinder; the upper end of the movable support rod is connected with the top bearing plate, and the lower end of the movable support rod extends into the roadbed packing layer to be detected; the compression system comprises a piston rod, the upper end of the piston rod is connected with the top bearing plate, the lower end of the piston rod is connected with a piston body, the piston body is arranged in an outer piston tube, measuring liquid is arranged in the outer piston tube, and a measuring liquid outlet is formed in the outer piston tube; the measuring and reading system comprises a measuring pipe, wherein one end of the measuring pipe is communicated with a measuring liquid outlet; the other end is communicated with the atmosphere and is vertically and fixedly arranged on the graduated scale; the relative displacement of the roadbed filling is visually measured by measuring the rising height of the liquid-liquid column; the relative displacement of the top bearing plate is the porosity reduction of the roadbed filler, and when the relative displacement at the measuring point of the roadbed filler is close to zero, the no-tamping reinforcing effect is judged, so that the determination of the tamping influence depth is realized.
Description
Technical Field
The invention belongs to the technical field of roadbed filler construction tests, and particularly relates to a roadbed tamping influence depth testing device and a roadbed tamping influence depth testing method.
Background
In recent years, with the rapid development of highways, the requirements of people on speed, stability, safety, comfort and the like are gradually improved, but the reduction of road surface flatness caused by the uneven settlement of a roadbed brings great influence on driving safety and comfort, particularly the uneven settlement of a road and bridge transition section; wherein, the local settlement and the broken butt strap caused by insufficient compaction of the soil body behind the abutment cause the 'bump at the bridge head'; the 'bump at the bridge head' not only influences the driving comfort of the vehicle and reduces the service life of the vehicle, but also causes different degrees of harm to the driving safety and the road operation; among them, the root cause of the disease is mainly insufficient roadbed compactness. Therefore, when the tamping machine is used for reinforcing the roadbed, the effective reinforcing depth of the filler is determined, the effective reinforcing ranges of different fillers are determined aiming at different tamping energies for increasing basic parameters of the roadbed compaction degree, and when necessary, the optimal water content is determined so that the effective reinforcing depth is the maximum. At present, the effective tamping depth of roadbed fillers is mainly based on empirical values, construction uncertainty is large, and roadbed quality cannot be guaranteed.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a device and a method for testing the influence depth of roadbed tamping, and aims to solve the technical problem that the roadbed tamping depth is determined by adopting an empirical value and the construction uncertainty is large in the prior art.
In order to solve the technical problems, the invention solves the problems by the following technical scheme:
the invention provides a roadbed ramming influence depth testing device which comprises a fixing system, a compression system and a measuring and reading system, wherein the compression system is fixedly arranged in the fixing system and is connected with the measuring and reading system;
the fixing system comprises a top bearing plate, a fixed supporting cylinder, a movable supporting rod and a bottom bearing plate; the top bearing plate is sleeved at the upper end of the fixed supporting cylinder in a sliding manner, and the fixed supporting cylinder is fixedly arranged on the bottom bearing plate; the upper end of the movable supporting rod is fixedly connected with the top bearing plate, and the lower end of the movable supporting rod penetrates through the bottom bearing plate and extends into the roadbed packing layer to be detected;
the compression system comprises a piston rod, a piston body, a piston outer pipe and a piston base, wherein the upper end of the piston rod is fixedly connected with the top bearing plate; the lower end of the piston rod is fixedly connected with the piston body, the piston body is arranged in the piston outer tube in a matching mode, and the lower end of the piston outer tube is fixedly arranged on the piston base; the piston outer tube is filled with measuring liquid, and the bottom of the piston outer tube is provided with a measuring liquid outlet;
the measuring and reading system comprises a measuring tube and a graduated scale, wherein one end of the measuring tube is communicated with a measuring liquid outlet at the bottom of the outer tube of the piston; the other end of surveying buret and atmosphere intercommunication, and vertical fixed setting on the scale, the vertical setting of scale.
Further, the stress measuring device comprises a pressure sensor and a strain gauge, the pressure sensor is fixedly arranged on the top bearing plate, and the output end of the pressure sensor is connected with the input end of the strain gauge.
Furthermore, a measuring through hole is formed in the bottom end of the side wall of the fixed supporting cylinder, a measuring protective sleeve is arranged on the measuring through hole, and the measuring pipe is sleeved in the measuring protective sleeve in a penetrating mode.
Further, a rubber pad is arranged between the top bearing plate and the fixed supporting cylinder.
Furthermore, the compression system also comprises a fixed connecting rod which is vertically arranged between the piston base and the bottom bearing plate; the upper end of the fixed connecting rod is fixedly connected with the piston base, and the lower end of the fixed connecting rod is fixedly connected with the bottom bearing plate.
Furthermore, the measuring and reading system is also provided with a pipe plug which is arranged at one end of the measuring pipe communicated with the atmosphere; the pipe plug adopts a ventilation type pipe plug.
Further, the lower end of the movable support rod 13 is set to be a conical structure.
Furthermore, the pressure sensor adopts a resistance type pressure sensor, and the strain adopts a dynamic strain gauge.
Furthermore, survey buret and include first vertical pipe, horizontal pipe and the vertical pipe of second, the one end of first vertical pipe and the outlet intercommunication of measuring liquid bottom the piston outer tube, the other end of first vertical pipe and the one end intercommunication of horizontal pipe, the horizontal pipe is worn to overlap in surveying the pipe protective sheath, the other end of horizontal pipe and the lower extreme intercommunication of the vertical pipe of second, the vertical pipe of second is hugged closely and is fixed on the scale.
The invention also provides a roadbed ramming influence depth testing method, and the roadbed ramming influence depth testing device comprises the following steps:
and 3, obtaining the roadbed ramming influence depth according to the depth-filler relative displacement curve in the step 2.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a device for testing the influence depth of roadbed ramming, which is characterized in that a fixing system, a compression system and a measuring and reading system are arranged, so that the relative displacement of roadbed fillers at a measuring point of a roadbed filler layer is realized, and the rising height of a liquid column is measured visually in the measuring and reading process; when the roadbed filling is subjected to tamping load, the porosity of the roadbed filling is reduced, the top bearing plate is displaced downwards, the relative displacement of the top bearing plate is the porosity reduction of the roadbed filling, and when the relative displacement at the measuring point of the roadbed filling is close to zero, no reinforcement effect is determined, so that the determination of the tamping influence depth is realized.
Furthermore, by arranging the stress measuring device, under the action of the tamping load, the transmission condition of the tamping load in the roadbed filler is monitored, the tamping load stress at the measuring point of the roadbed filler layer corresponds to the relative displacement of the filler, a stress-depth curve and a relative displacement-depth curve are obtained, and the effective reinforcing depth value of the roadbed filler is further obtained.
Furthermore, through setting up the measurement protective sheath, realized the protection to surveying buret, avoid packing to surveying buret's influence, effectively improved measured data's accuracy.
Furthermore, a rubber pad is arranged between the top bearing plate and the fixed supporting cylinder, so that roadbed fillers are effectively prevented from entering the fixed supporting cylinder, and rigid contact friction resistance between the top bearing plate and the fixed supporting cylinder is reduced.
Furthermore, a fixed connecting rod is arranged between the piston base and the bottom bearing plate, a reserved space is formed between the piston base and the bottom bearing plate, and the measuring pipe is convenient to mount.
Furthermore, the pipe plug is arranged on the measuring pipe, so that the influence on the measuring data caused by the fact that sundries enter the measuring pipe is avoided.
Furthermore, the lower end of the movable supporting rod is set to be in a conical structure, and the lower end of the movable supporting rod is used as a piercing end through sharpening, so that the penetration resistance of the movable supporting rod is reduced.
The invention also provides a roadbed ramming influence depth testing method, which is simple in operation method, and can intuitively obtain the relative displacement of roadbed fillers with different depths under each ramming action, so that the measuring of the ramming influence depth is realized, and the accuracy of the measuring result is high.
Drawings
FIG. 1 is a schematic overall structure diagram of a roadbed ramming influence depth testing device according to the invention;
FIG. 2 is a schematic cross-sectional structure view at A-A of the roadbed ramming influence depth testing device disclosed by the invention;
FIG. 3 is a schematic cross-sectional structure diagram at B-B of the roadbed ramming influence depth testing device provided by the invention;
FIG. 4 is a schematic diagram of a using state of the roadbed ramming influence depth testing device according to the invention;
FIG. 5 is a stress curve diagram in the roadbed ramming influence depth testing method according to the invention;
FIG. 6 is a graph of relative displacement in a method for testing the impact depth of path tamping according to the present invention.
Wherein, 1 fixing system, 2 compressing system, 3 measuring and reading system, 4 stress measuring device; 11 top bearing plates, 12 fixed supporting cylinders, 13 movable supporting rods, 14 bottom bearing plates and 15 measuring pipe protective sleeves; 21 piston rod, 22 piston body, 23 piston outer tube, 24 piston base, 25 fixed connecting rod and 26 piston rod end plate; 31 measuring tube, 32 graduated scale, 33 base, 34 plug; 311 a first vertical tube, 312 a horizontal tube, 313 a second vertical tube.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-4, the invention provides a roadbed ramming influence depth testing device, which comprises a fixing system 1, a compression system 2, a measuring and reading system 3 and a stress measuring device 4; the fixing system 1 is used for fixedly installing the compression system 2, the compression system 2 is arranged in the fixing system 1, and the upper end and the lower end of the compression system 2 are fixedly connected with the upper end and the lower end of the fixing system 1 respectively; the measuring and reading system 3 is connected with the compression system 2; the stress measuring device 4 is arranged on the fixing system 1, and the stress measuring device 4 is used for measuring dynamic response of the tamping load at the depth of a measuring point of a roadbed packing layer.
The fixing system 1 comprises a top bearing plate 11, a fixed supporting cylinder 12, a movable supporting rod 13, a bottom bearing plate 14 and a measuring protective sleeve 15; the top bearing plate 11 is horizontally sleeved at the upper end of the fixed supporting cylinder 12, the top bearing plate 11 and the fixed bearing plate 11 are in sliding connection with the fixed supporting cylinder 12, and the top bearing plate 11 is used for bearing tamping load; the fixed supporting cylinder 12 is vertically and fixedly arranged at the upper end of the bottom bearing plate 12, and the bottom bearing plate 14 is horizontally arranged; the upper end of a movable supporting rod 13 is fixedly connected with the top bearing plate 11, and the lower end of the movable supporting rod 13 penetrates through the bottom bearing plate 12 and extends into the roadbed packing layer; the movable support rod 13 is movably connected with the bottom bearing plate 14; the bottom end of the side wall of the fixed supporting cylinder 12 is provided with a measuring through hole, the measuring protective sleeve 15 is connected with the measuring through hole, and one end of the measuring and reading system 3 is sleeved in the measuring protective sleeve 15 and connected with the compression system 2.
The upper end of the compression system 2 is fixedly connected with the top bearing plate 11, and the lower end of the compression system 2 is fixedly connected with the bottom bearing plate 14; the compression system 2 comprises a piston rod 21, a piston body 22, a piston outer tube 23, a piston base 24, a fixed connecting rod 25 and a piston rod end plate 26, wherein the upper end of the piston rod 21 is fixedly connected with the lower surface of the top bearing plate 11; the piston rod end plate 26 is arranged between the piston rod 21 and the top bearing plate 11, the upper surface of the piston rod end plate 26 is fixedly connected with the lower surface of the top bearing plate 11, the lower surface of the piston rod end plate 26 is fixedly connected with the upper end of the piston rod 21, and the piston rod end plate 26 is arranged between the top bearing plate 11 and the piston rod 21, so that the stable connection between the piston rod 21 and the top bearing plate 11 is ensured; the lower end of the piston rod 21 is fixedly connected with the piston body 22, the piston body 22 is arranged in the piston outer tube 23 in a matching way, and the lower end of the piston outer tube 23 is fixedly arranged on the piston base 24; the piston outer tube 23 is filled with measuring liquid, and the bottom of the piston outer tube 23 is provided with a measuring liquid outlet which is used for being connected with the measuring and reading system 3; when the top bearing plate 11 bears the tamping load, the roadbed packing layer is compacted under the action of the tamping load, at the moment, the top bearing plate 11 generates downward displacement to drive the piston rod 21 to move downward, the piston rod 21 drives the piston body 22 to compress the measuring liquid in the piston outer tube 23 to enter the measuring and reading system 3, and the up-and-down movement displacement difference of the top bearing plate 11 under the action of the tamping load is realized by measuring the height of the measuring liquid entering the measuring and reading system 3, so that the compaction condition of the roadbed packing layer is measured; the fixed connecting rod 25 is vertically arranged at the bottom of the piston base 24, the upper end of the fixed connecting rod 25 is fixedly connected with the bottom of the piston base 24, and the lower end of the fixed connecting rod 25 is fixedly connected with the upper surface of the bottom bearing plate 14.
The measuring and reading system 3 comprises a measuring tube 31, a graduated scale 32, a scale base 33 and a tube plug 34, wherein the measuring tube 31 adopts a U-shaped tube; the measuring pipe 31 comprises a first vertical pipe 311, a horizontal pipe 312 and a second vertical pipe 313, one end of the first vertical pipe 311 is communicated with a measuring liquid outlet at the bottom of the piston outer pipe 23, the other end of the first vertical pipe 311 is communicated with one end of the horizontal pipe 312, the horizontal pipe 312 is sleeved in the measuring pipe protective sleeve 15 in a penetrating manner, the other end of the horizontal pipe 312 is communicated with the lower end of the second vertical pipe 313, a pipe plug 34 is arranged at the upper end of the second vertical pipe 313, the pipe plug 34 adopts a ventilation type pipe plug, the measuring pipe 31 is ensured to be communicated with the atmosphere, and meanwhile, sundries are prevented from entering the measuring pipe 31; the graduated scale 32 is vertically arranged on the scale base 33, the second vertical pipe 313 and the graduated scale 32 are vertically arranged in parallel and are tightly attached to and fixed on the graduated scale 32, and the lifting height of the measuring liquid in the second vertical pipe 313 can be read out through the scale value on the graduated scale 32; the top end of the graduated scale 32 is provided with a level bubble for adjusting the graduated scale 32 to be in a vertical state.
The stress measuring device 4 comprises a pressure sensor and a strain gauge, the pressure sensor is fixedly arranged on the top bearing plate 11, the output end of the pressure sensor is connected with the input end of the strain gauge, and the pressure sensor is used for measuring dynamic response of the ramming load at the depth of a measuring point.
Working principle and using method
As shown in fig. 5-6, when assembling, according to the roadbed ramming influence depth testing device of the present invention, firstly, the piston body 22 is fastened and connected with the lower end of the piston rod 21, the piston rod 21 is fixedly arranged on the top bearing plate 11 through the piston rod end plate 26, and the piston rod 21 and the piston body 22 are assembled to form a piston main rod; pressing the piston main rod into the piston outer tube 23, and fixedly connecting the lower end of the piston outer tube 23 with the piston base 24 to form a compression system 2; then, the compression system 2 is fixed by the fixing system 1; finally, one end of the measuring tube 31 is communicated with a measuring liquid outlet at the bottom of the piston outer tube 23, the other end of the measuring tube 31 is led out through a measuring through hole on the side wall of the fixed supporting cylinder 12, and the other end of the measuring tube 31 is fixed on the graduated scale 32; and a pressure sensor is fixedly arranged on the upper surface of the top bearing plate 11, and the output end of the pressure sensor is connected with the input end of a stress meter.
During measurement, firstly, the measuring device is buried at a preset measuring point of a roadbed packing layer; then calibrating the measurement liquid in the piston outer tube 23 in the measurement tube 31, applying a preset load on the top of the top bearing plate 11 during calibration to enable the piston rod 21 to move downwards by delta H, measuring the rising height of a measurement liquid column in a second vertical tube of the measurement tube 31 at the moment by delta H, and further obtaining a calibration parameter K; the expression of the calibration parameter K is:
wherein, Delta H is a descending value of the piston rod; delta h is the rise value of the liquid column of the measuring tube; k is a calibration parameter;
then, applying a tamping load on the top bearing plate 11, and improving the compaction degree of the roadbed filler mainly by reducing the porosity of the filler according to the roadbed filler reinforcing mechanism; under the action of tamping load, the movable support rod 13 moves in the roadbed filling to drive the top bearing plate 11 to move downwards; when the top bearing plate 11 moves downwards, the piston body 22 is driven by the piston rod 21 to compress the measuring liquid in the piston outer tube 23, the measuring liquid enters the first vertical tube of the measuring tube 31 through the measuring liquid outlet at the bottom of the piston outer tube 23 after being compressed, and enters the second vertical tube through the horizontal tube, and the liquid level of the measuring liquid in the second vertical tube rises; the ascending height of the measuring liquid in the measuring pipe 31 is obtained through the scale measurement on the graduated scale 32, the measurement of the descending height of the top bearing plate 11 is realized, the relative displacement value of the roadbed filler under the action of the tamping load is further obtained, and the relative displacement-depth curve of the roadbed filler is obtained by arranging the measuring device of the invention at the measuring points of roadbed filler layers with different heights;
under the action of tamping load, the relative displacement value of the roadbed filler at the measuring point of any roadbed filler layer is obtained by the following formula:
ΔH
i＝K
in the formula: Δ H
iFor packing layers of road bedsMeasuring a relative displacement value of an ith packing layer;
h
1measuring the liquid column reading before tamping;
h
2measuring the liquid-liquid column reading after tamping;
k is a calibration parameter;
obtaining the rising height value of a measured liquid-liquid column in the testing device at different heights by using a measuring and reading system, obtaining the relative displacement value of the filler according to the rising height of the measured liquid-liquid column, and drawing a depth-filler relative displacement curve; when the depth-filler relative displacement curve approaches the horizontal level, the relative displacement of the roadbed filler at the corresponding measuring point of the roadbed filler layer approaches zero, the condition that the tamping load has no reinforcing effect can be judged, and the effective reinforcing depth can be determined.
By arranging the stress measuring device 4, under the action of tamping load, the reinforcement depth of different fillers under different tamping energy conditions is analyzed by monitoring the transmission condition and visual displacement change of impact load in the roadbed filler; arranging a pressure sensor on the upper surface of a top bearing plate 11, corresponding the stress of a measuring point of a roadbed packing layer to the relative displacement of the roadbed packing, connecting the pressure sensor with a strain gauge, measuring the dynamic response of the tamping load at the depth of the measuring point, and measuring the relative variation of the tamping load along the depth at the measuring point of the roadbed packing layer to obtain a stress curve; the gravity stress curve is calculated theoretically through actually measuring the gravity of the filler, and according to the soil mechanics theory, the additional stress has a reinforcing effect on the soil body only when the additional stress is greater than the gravity stress. Therefore, the effective reinforcing depth value of the roadbed filler is determined according to the intersection point of the additional stress curve and the self-weight stress curve and the stable point of the tamping relative displacement curve.
Examples
The invention relates to a roadbed ramming influence depth testing device which comprises a fixing system 1, a compression system 2, a measuring and reading system 3 and a stress measuring device 4, wherein the fixing system is used for fixing a roadbed ramming influence depth; the compression system 2 adopts a piston pipe combination, and the compression system 2 is fixed through the fixing system 1; the compression system 2 is filled with measuring liquid, and the measuring liquid adopts water or oil; the compression system 2 is connected with the measuring and reading system 3, when the fixing system 1 is subjected to a tamping load, the fixing system 1 drives the piston body 22 in the compression system 2 to generate displacement, the piston rod drives the piston body 22 to compress the measuring liquid to enter the measuring and reading system 3, the relative displacement of the fixing system 1 is obtained through the rising height of the measuring liquid in the measuring and reading system 3, then the relative displacement of the roadbed filler is obtained, the determination of the compaction degree of the measuring point filler is realized, and further the compaction depth of the tamping load is obtained.
The fixing system 1 comprises a top bearing plate 11, a fixed support cylinder 12, two movable support rods 13, a bottom bearing plate 14 and a measuring protective sleeve 15; the top bearing plate 11 is horizontally sleeved at the upper end of the fixed supporting cylinder 12, the top bearing plate 11 and the fixed bearing plate 11 are in sliding connection with the fixed supporting cylinder 12, and the top bearing plate 11 is used for bearing tamping load; a rubber pad is arranged between the top bearing plate 11 and the fixed supporting cylinder 12, so that roadbed fillers are effectively prevented from entering the fixed supporting cylinder 12, and the rigid contact friction resistance between the top bearing plate 11 and the fixed supporting cylinder 12 is reduced.
The fixed supporting cylinder 12 is vertically and fixedly arranged at the upper end of the bottom bearing plate 12, and the bottom bearing plate 12 is horizontally arranged; the two movable support rods 13 are symmetrically arranged at two sides of the compression system 2; the upper end of the movable support rod 13 is fixedly connected with the top bearing plate 11, and the lower end of the movable support rod 13 penetrates through the bottom bearing plate 12 and then is inserted into the roadbed packing layer; the lower end of the movable supporting rod 13 is arranged to be in a conical structure, and the conical structure is used as a piercing end to be inserted into a roadbed packing layer through sharpening treatment, so that the insertion resistance of the movable supporting rod 13 is reduced; the movable support rod 13 is movably connected with the bottom bearing plate 14; a measuring through hole is formed in the bottom end of the side wall of the fixed supporting cylinder 12, one end of the measuring protective sleeve 15 is connected with the measuring through hole, and one end of the measuring pipe 31 penetrates through the measuring protective sleeve 15 and is connected with the compression system 2; by arranging the measuring protective sleeve 15, the measuring tube 31 is effectively prevented from being damaged by roadbed filling, and errors of measuring data are avoided; the measuring protective sleeve 15 adopts an iron pipe or a stainless steel flexible hose; because of the actual construction requirements, the measuring tube 31 is often longer, and for the convenience of operation, the measuring protective sleeve 15 is arranged in a sectional connection or bending way; when approaching the ramming plane, the measuring protective sleeve 15 adopts an iron pipe because the ramming dynamic load is large, and the influence on the measuring data is avoided.
The compression system 2 comprises a piston rod 21, a piston body 22, a piston outer tube 23, a piston base 24, four fixed connecting rods 25 and a piston rod end plate 26, wherein the upper end of the piston rod 21 is fixedly connected with the lower surface of the top bearing plate 11; the piston rod end plate 26 is arranged between the piston rod 21 and the top bearing plate 11, the upper surface of the piston rod end plate 26 is fixedly connected with the lower surface of the top bearing plate 11, and the lower surface of the piston rod end plate 26 is fixedly connected with the upper end of the piston rod 21; the lower end of the piston rod 21 is fixedly connected with the piston body 22, the piston body 22 is arranged in the piston outer tube 23 in a matching manner, the lower end of the piston outer tube 23 is fixedly arranged on the piston base 24, a through hole is formed in the piston base 24, the through hole in the piston base 24 is matched with the position of a measuring liquid outlet in the piston outer tube 23, and the measuring tube 31 is convenient to communicate with the measuring liquid outlet in the piston outer tube 23 after penetrating through the piston base 24; the piston outer tube 23 is filled with measuring liquid, and the measuring liquid adopts water or oil; a measuring liquid outlet is formed in the bottom of the outer piston tube 23, and one end of the measuring and reading system 3 is communicated with the measuring liquid outlet in the bottom of the outer piston tube 23; when the top bearing plate 11 bears the tamping load, the top bearing plate 11 is driven to move downwards, the top bearing plate 11 drives the piston rod 21 to move downwards, the piston body 22 is driven to compress the measuring liquid in the piston outer tube 23 and enter the measuring and reading system 3, and the up-and-down movement displacement difference of the top bearing plate 11 under the action of the tamping load is realized by measuring the rising height of a measuring liquid column entering the measuring and reading system 3, so that the measurement of the relative displacement in the compaction process of the roadbed filler is realized; four fixed connecting rods 25 are vertically and symmetrically arranged at the bottom of the piston base 23, the upper ends of the fixed connecting rods 25 are fixedly connected with the bottom of the piston base 23, and the lower ends of the fixed connecting rods 25 are fixedly connected with the upper surface of the bottom bearing plate 14; a fixed connecting rod 25 is arranged between the piston base 23 and the bottom bearing plate 14, a reserved space is formed between the piston base 23 and the bottom bearing plate 14, and the measuring pipe 31 is convenient to mount.
The measuring and reading system 3 comprises a measuring tube 31, a graduated scale 32, a scale base 33 and a tube plug 34, wherein the measuring tube 31 adopts a U-shaped tube; the measuring tube 31 comprises a first vertical tube 311, a horizontal tube 312 and a second vertical tube 313, one end of the first vertical tube 311 is communicated with a measuring liquid outlet at the bottom of the piston outer tube 23, the other end of the first vertical tube 311 is communicated with one end of the horizontal tube 312, the horizontal tube 312 is sleeved in the measuring tube protective sleeve 15 in a penetrating manner, the other end of the horizontal tube 312 is communicated with the lower end of the second vertical tube 313, and a tube plug 34 is arranged at the upper end of the second vertical tube 313; the pipe plug 34 adopts a ventilation type pipe plug, so that the pressure of the measuring pipe 31 is ensured to be communicated with the atmosphere, and meanwhile, sundries are prevented from entering the measuring pipe 31; the graduated scale 32 is vertically arranged on the scale base 33, the second vertical pipe 313 and the graduated scale 32 are vertically arranged in parallel and are tightly attached to and fixed on the graduated scale 32, and the lifting height of the measuring liquid in the second vertical pipe 313 can be read out through the scale value on the graduated scale 32; a leveling bubble is arranged at the top end of the graduated scale 32 and used for adjusting the graduated scale 32 to be in a vertical state; the scale precision of the graduated scale 32 is 0.1mm, and the scale base 33 is made of a steel plate; preferably, the graduated scale 32 is fixedly connected with the scale base 33 by a pull rope. To facilitate the reading of the measurement tubes 31, the measurement devices at the measurement points of the different filler layers at the same roadbed position are numbered and the measurement tubes 31 of each layer are fixed to the same scale 32.
The stress measuring device 4 comprises a pressure sensor and a strain gauge, the pressure sensor is fixedly arranged on the top bearing plate 11, the output end of the pressure sensor is connected with the input end of the strain gauge, and the pressure sensor is used for measuring dynamic response of the ramming load at the depth of a measuring point. The pressure sensor adopts a resistance type pressure sensor, and the strain gauge adopts a dynamic strain gauge.
The invention also provides a roadbed ramming influence depth testing method, which comprises the following steps:
step 4, according to the depth-filler relative displacement curve in the step 2, when the depth-filler relative displacement curve approaches the horizontal level, the corresponding depth value is the roadbed ramming influence depth;
or according to the depth-stress curve in the step 3, obtaining the natural gravity gamma of the roadbed filling through indoor tests according to a formula sigma
zγ z, where σ
zThe value of the self-weight stress is the depth z, and z is the depth value; and determining a self-weight stress curve, and combining the actually measured depth-stress curve, wherein the depth value corresponding to the intersection point of the self-weight stress curve and the depth-stress curve is the roadbed ramming influence depth.
The roadbed ramming influence depth measuring device determines the actual reinforcing depth of roadbed filler based on field test, and the roadbed ramming influence depth measuring device is arranged at the measuring point of the roadbed filler layer, and the resistance-type pressure box and the displacement monitoring device are embedded to determine the vertical transmission effect of ramming load in the filler, so that the effective reinforcing depth is converted, and ramming process parameters are further determined, and the purposes of reasonable construction and construction period acceleration are achieved.
The above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A testing device for roadbed ramming influence depth is characterized by comprising a fixing system (1), a compression system (2) and a measuring and reading system (3), wherein the compression system (2) is fixedly arranged in the fixing system (1), and the compression system (2) is connected with the measuring and reading system (3);
the fixing system (1) comprises a top bearing plate (11), a fixed supporting cylinder (12), a movable supporting rod (13) and a bottom bearing plate (14); the top bearing plate (11) is sleeved at the upper end of the fixed supporting cylinder (12) in a sliding manner, and the fixed supporting cylinder (12) is fixedly arranged on the bottom bearing plate (12); the upper end of the movable supporting rod (13) is fixedly connected with the top bearing plate (11), and the lower end of the movable supporting rod (13) penetrates through the bottom bearing plate (12) and extends into the roadbed packing layer to be detected;
the compression system (2) comprises a piston rod (21), a piston body (22), a piston outer tube (23) and a piston base (24), and the upper end of the piston rod (21) is fixedly connected with the top bearing plate (11); the lower end of the piston rod (21) is fixedly connected with the piston body (22), the piston body (22) is arranged in the piston outer tube (23) in a matching way, and the lower end of the piston outer tube (23) is fixedly arranged on the piston base (24); the piston outer tube (23) is filled with measuring liquid, and the bottom of the piston outer tube (23) is provided with a measuring liquid outlet;
the measuring and reading system (3) comprises a measuring tube (31) and a graduated scale (32), wherein one end of the measuring tube (31) is communicated with a measuring liquid outlet at the bottom of the piston outer tube (23); the other end of measuring pipe (31) and atmosphere intercommunication, and vertical fixed the setting on scale (32), the vertical setting of scale (32).
2. The roadbed ramming influence depth testing device according to claim 1, characterized by further comprising a stress measuring device (4), wherein the stress measuring device (4) comprises a pressure sensor and a strain gauge, the pressure sensor is fixedly arranged on the top bearing plate (11), and an output end of the pressure sensor is connected with an input end of the strain gauge.
3. The roadbed ramming influence depth testing device is characterized in that the bottom end of the side wall of the fixed supporting cylinder (12) is provided with a measuring through hole, a measuring protective sleeve (15) is arranged on the measuring through hole, and the measuring pipe (31) is sleeved in the measuring protective sleeve (15).
4. The roadbed ramming influence depth testing device is characterized in that a rubber pad is arranged between the top bearing plate (11) and the fixed support cylinder (12).
5. The roadbed ramming influence depth testing device according to claim 1, wherein the compression system (2) further comprises a fixed connecting rod (25), and the fixed connecting rod (25) is vertically arranged between the piston base (24) and the bottom bearing plate (14); the upper end of the fixed connecting rod (25) is fixedly connected with the piston base (24), and the lower end of the fixed connecting rod (25) is fixedly connected with the bottom bearing plate (14).
6. The roadbed ramming influence depth testing device is characterized in that the measuring and reading system (3) further comprises a pipe plug (34), the pipe plug (34) is arranged at one end of the measuring pipe (31) communicated with the atmosphere; the pipe plug (34) adopts a ventilation type pipe plug.
7. The roadbed ramming influence depth testing device is characterized in that the lower end of the movable support rod 13 is in a conical structure.
8. The roadbed ramming influence depth testing device according to claim 2, wherein the pressure sensor is a resistance type pressure sensor, and the strain is a dynamic strain gauge.
9. The roadbed ramming influence depth testing device is characterized in that the measuring pipe (31) comprises a first vertical pipe (311), a horizontal pipe (312) and a second vertical pipe (313), one end of the first vertical pipe (311) is communicated with a measuring liquid outlet at the bottom of the piston outer pipe (23), the other end of the first vertical pipe (311) is communicated with one end of the horizontal pipe (312), the horizontal pipe (312) is sleeved in the measuring pipe protective sleeve (15) in a penetrating mode, the other end of the horizontal pipe (312) is communicated with the lower end of the second vertical pipe (313), and the second vertical pipe (313) is tightly fixed on the graduated scale (32).
10. A roadbed ramming influence depth testing method, which is characterized in that the roadbed ramming influence depth testing device of any one of claims 1 to 9 is used, and comprises the following steps:
step 1, burying a plurality of roadbed ramming influence testing devices at preset testing points of roadbed packing layers with different heights;
step 2, applying a tamping load on the roadbed filling, measuring and reading filling relative displacement values at preset measuring points of roadbed filling layers with different heights, and drawing a depth-filling relative displacement curve;
and 3, obtaining the roadbed ramming influence depth according to the depth-filler relative displacement curve in the step 2.
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Citations (1)
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| CN207850359U (en) * | 2018-03-08 | 2018-09-11 | 颜陈红 | A kind of device measuring Highway Foundation sedimentation |
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| CN207850359U (en) * | 2018-03-08 | 2018-09-11 | 颜陈红 | A kind of device measuring Highway Foundation sedimentation |
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