CN108360490B - On-site test method for influence of road traffic load on adjacent foundation pit support structure - Google Patents
On-site test method for influence of road traffic load on adjacent foundation pit support structure Download PDFInfo
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- CN108360490B CN108360490B CN201810172983.5A CN201810172983A CN108360490B CN 108360490 B CN108360490 B CN 108360490B CN 201810172983 A CN201810172983 A CN 201810172983A CN 108360490 B CN108360490 B CN 108360490B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
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Abstract
A field test method for the influence of road traffic load on an adjacent foundation pit support structure comprises the following steps: (1) determining a test section: determining a test section according to the actual excavation working condition and the road traffic condition on site; (2) measuring the soil body pressure under traffic load; (3) measuring the soil pressure of the enclosure structure; (4) measuring the acceleration of the pavement and the enclosure structure; (5) and (3) collecting data, recording the reading of each sensor in the driving process of the pit side vehicle by using a data collector, wherein the testing time lasts for two traffic light periods or more. According to the invention, dynamic responses such as soil moving pressure and acceleration of the deep foundation pit enclosure structure under the action of traffic load at the pit edge are tested, the relationship between the enclosure structure acceleration and the soil moving pressure under the action of vehicle load is established, and the interaction mechanism of soil and structure under the action of dynamic load is disclosed.
Description
Technical Field
The invention relates to a field test method for the influence of road traffic load on a near foundation pit support structure, belonging to the technical field of civil engineering test methods.
Background
With the rapid development of urban construction, land resources are increasingly in short supply, more and more foundation pits are positioned near traffic main roads, and the surrounding environment is increasingly complex when the foundation pits are excavated. The foundation pit is used as a temporary structure, the safety reserve is limited, how to consider the adverse factors in the design and construction, and the safety and economy are realized, so that the foundation pit becomes an urgent engineering problem to be solved.
The dynamic response of the foundation pit support structure under the action of traffic load, namely the change of parameters such as dynamic stress, dynamic displacement (or acceleration) and the like, including the change attenuation along with time, and the transmission and the diffusion along the space. The dynamic characteristics of the dynamic parameter changes directly affect the safety of the foundation pit engineering. At present, for the soil pressure calculation problem under the influence of traffic load, the vehicle load is considered as the static load, and the vibration characteristic of the vehicle load is not considered. Because the influence of the dynamic effect of the traffic load at the pit edge on the foundation pit support structure is huge and the action mechanism is complex, the dynamic response of the foundation pit support structure under the action of the traffic load at the pit edge needs to be researched in an emphasized manner.
Disclosure of Invention
The invention aims to provide a field test method for the influence of road traffic load on an enclosure structure of an adjacent foundation pit, aiming at the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a field test method for the influence of road traffic load on an adjacent foundation pit support structure comprises the following steps:
(1) determining a test section: determining a test section according to the actual excavation working condition and the road traffic condition on site;
(2) measuring the soil body pressure under traffic load;
(3) measuring the soil pressure of the enclosure structure;
(4) measuring the acceleration of the pavement and the enclosure structure;
(5) and (3) collecting data, recording the reading of each sensor in the driving process of the pit side vehicle by using a data collector, wherein the testing time lasts for two traffic light periods or more.
The soil body pressure measurement under the traffic load comprises the following steps:
(1) designing an embedding interval: the position of the embedded soil pressure box groove is positioned on a tire track line in the actual vehicle running process, and the length of the embedded soil pressure box groove and the distance between the soil pressure boxes are determined according to the width of the tire; the distance between the centers of the soil pressure boxes is smaller than the width of the wheels, so that two or more soil pressure boxes can acquire data each time the vehicle passes through the area;
(2) excavating a soil pressure box embedding groove: the long side of the embedding groove is perpendicular to the tire track line, the long side is more than twice the width of the tire, and the width and the depth are suitable for the size of the soil pressure cell; taking the embedding groove as a starting point, and opening a small groove to the roadside so as to place a lead of the soil pressure cell and connect the data acquisition device;
(3) burying a soil pressure cell: laying a soil pressure box in the constructed embedding groove, filling sand, covering the soil pressure box with the filled sand completely, covering a steel plate on the sand, and embedding the lead in the small groove to recover the passing;
(4) and connecting the soil pressure cell with a data acquisition instrument through a lead and resetting.
The method for measuring the soil pressure of the enclosure structure comprises the following steps:
(1) determining the soil pressure test point position of the enclosure structure: determining the soil pressure test points of the enclosure structure on the section by taking the determined test section as a reference, wherein the distance between every two test points is not less than 10 cm;
(2) coring at a fixed point: drilling a hole on the building envelope according to the determined point position and taking out the concrete core;
(3) connecting a soil pressure cell wire with a data acquisition instrument and clearing a zero point;
(4) fixing the soil pressure box: selecting a concrete core with a smoother section, fixing the back of the soil pressure box on the section by using hot melt adhesive, fixing the lead of the soil pressure box on the side wall of the drill core by using transparent adhesive tape paper, and pushing the concrete core back to the enclosure structure; sealing the coring hole with cement slurry on the inner side of the enclosure structure; the back soil of the supporting structure is ensured to be in contact with the front of the soil pressure box, and the soil pressure box is ensured to be fixed.
The acceleration measurement steps of the pavement and the enclosure structure are as follows:
(1) determining an acceleration test point position of the building envelope: determining an acceleration test point location of the enclosure structure on the section by taking the determined test section as a reference, wherein the acceleration test point location comprises a pavement test point location and an enclosure structure test point location, the arrangement direction of the pavement test point location is vertical to the enclosure structure, the position of the pavement test point location is determined according to the site traffic condition, no less than three points are needed under the condition that normal traffic is not hindered, and the distance between the points is no less than 10 cm; the building envelope acceleration test point positions are the same as the building envelope soil pressure test point positions and are in one-to-one correspondence;
(2) fixing the low-frequency vibration pickup at a corresponding test point position on the inner side of the enclosure structure by using hot melt adhesive, and ensuring that the test direction of the low-frequency vibration pickup is the same as the normal direction of the inner side of the enclosure structure;
(3) and connecting the low-frequency vibration pickup with a data acquisition instrument through a lead and resetting.
The foundation pit support structure comprises: underground continuous walls, cast-in-place bored piles and occlusive piles.
The fixed-point coring method comprises the steps of drilling and coring after determining that a soil pressure box at the back of a supporting structure is buried at a position, selecting a cylindrical drill core with a smooth section, fixing the back of the soil pressure box on the section by hot melt adhesive, fixing a wire on the side face of the drill core by adhesive tape, pushing the drill core into a drill hole buried at the position, leading out the wire, and finally sealing a hole opening by cement mortar.
Compared with the prior art, the method has the advantages that the method establishes the relation between the enclosure structure acceleration and the moving soil pressure under the action of the vehicle load by testing the dynamic responses such as the moving soil pressure and the acceleration of the deep foundation pit enclosure structure under the action of the traffic load at the pit edge, reveals the interaction mechanism of the soil and the structure under the action of the dynamic load, enriches the research on the aspects such as the foundation pit supporting design and the like, and perfects the related theory on the aspect of the traffic load soil pressure.
Drawings
FIG. 1 is an operation schematic diagram of a field test method for the influence of road traffic load on an adjacent foundation pit support structure;
FIG. 2 is a schematic diagram of the arrangement of the on-site test elements for the influence of the road traffic load on the enclosure structure of the adjacent foundation pit according to the invention;
FIG. 3 is a schematic view of a traffic load testing section;
FIG. 4 is a schematic view of the soil pressure, ground and acceleration testing portions of the building envelope;
FIG. 5 is a schematic view of a method for burying the earth pressure box of the building envelope;
in the figure, 11 is a vehicle running track line, 12 is a test section, 13 is a building enclosure, 21 is a soil pressure cell embedding groove, 22 is a road surface soil pressure cell, 23 is a steel plate, 24 is a wire guide groove, 31 is a building enclosure low-frequency vibration pickup, 32 is a road surface low-frequency vibration pickup, 33 is a building enclosure soil pressure cell, 34 is a concrete core, and 35 is a soil pressure cell wire.
Detailed Description
The method for testing the influence of the road surface traffic load on the enclosure structure of the adjacent foundation pit on the site is further explained by the embodiment.
A certain deep foundation pit engineering in one Hangzhou city is taken as an embodiment, and the deep foundation pit enclosure structure of the engineering is an underground continuous wall.
As shown in fig. 1, a field test method for the influence of road traffic load on the enclosure structure of the adjacent foundation pit comprises the following steps:
s1, determining a test section 12 according to the actual excavation working condition and the road traffic condition on site. At the selected section, the distance between the vehicle driving trajectory line 11 and the enclosure structure is 1m, the foundation pit is excavated to the bottom, the excavation depth is 11m, and the support deformation and displacement are in a safety range.
S2, traffic load measurement: as shown in fig. 2 and fig. 3, a rectangular soil pressure cell burying groove 21 with the length of 440mm, the width of 80mm and the depth of 50mm is excavated at the intersection of the test section and the vehicle driving track line 11, 5 road surface soil pressure cells 22 with the diameter of 40mm, the thickness of 6.5mm and the measuring range of 2.0Mpa are evenly placed, and the center distance between the road surface soil pressure cells 22 is 80 mm. A wire groove 24 is arranged to the roadside from the soil pressure cell burying groove 21 as a starting point for placing the soil pressure cell wires.
Paving a pavement soil pressure cell 22 in the constructed embedding groove, filling sandy soil, trowelling the surface sandy soil after the sandy soil completely covers the soil pressure cell, and covering a steel plate 23, so that the vehicle load can be uniformly distributed on the soil pressure cell through the steel plate and a sandy soil cushion layer. And connecting the soil pressure cell with a data acquisition instrument through a lead and resetting.
S3, measuring the soil pressure of the enclosure structure: as shown in fig. 4, the earth pressure test point locations of the building enclosure are determined on the section by taking the determination test section 12 as a reference, the depth of the building enclosure 13 is 11m, one earth pressure test point location is arranged every 1m, and 10 points are arranged in total. Based on the determined point location, the hole is drilled and the concrete core 34 is removed. Connecting the lead of the enclosing structure soil pressure box 33 with a data acquisition instrument and clearing a zero point, wherein the diameter of the enclosing structure soil pressure box 33 is 40mm, the thickness is 6.5mm, and the measuring range is 300 Kpa. As shown in fig. 5, a concrete core 34 with a relatively flat cross section is selected, the back surface of the enclosure structure soil pressure box 33 is fixed on the cross section by hot melt adhesive, the soil pressure box lead 35 is fixed on the side wall of the concrete core 34 by transparent adhesive tape, and then the concrete core is pushed back to the enclosure structure 13. And sealing the coring hole by cement mortar at the inner side of the enclosure structure 13. The back soil of the supporting structure is ensured to be in contact with the front surface of the enclosure structure soil pressure box 33, and the enclosure structure soil pressure box 33 is ensured to be fixed and used for measuring the change condition of the moving soil pressure of the deep foundation pit enclosure structure caused by road traffic load.
S4, acceleration measurement: the low frequency vibration pickup 31,32 is used with a frequency response in the range of 50Hz to 100Hz and a range of 2 g.
a) Measuring the acceleration of the road surface: as shown in fig. 3, on the test section, taking the top end of the underground continuous wall as a starting point, placing one road surface low-frequency vibration pickup 32 at intervals of 20cm, and fixing the road surface low-frequency vibration pickup 32 by using hot melt adhesive, wherein the test direction of the road surface low-frequency vibration pickup 32 is the same as the direction of the normal line inside the enclosure structure 13, so as to test the road surface dynamic response caused by the dynamic load of the vehicle; after the installation is finished, connecting the wire of the road surface low-frequency vibration pickup 32 with a data acquisition instrument and resetting;
b) and (3) measuring the acceleration of the building envelope: as shown in fig. 4, the depth of the building enclosure 13 is 11m, 10 soil pressure measurement point locations are arranged at intervals of 1m, and the acceleration measurement point locations and the soil pressure measurement point locations are the same and are in one-to-one correspondence. Fixing the enclosure structure low-frequency vibration pickup 31 on a corresponding test point position on the inner side of the enclosure structure by using hot melt adhesive, and ensuring that the test direction of the enclosure structure low-frequency vibration pickup 31 is the same as the direction of the normal line of the inner side of the enclosure structure 13 so as to test the dynamic response of the enclosure structure caused by road traffic load; and after the installation is finished, connecting the low-frequency vibration pickup 31 of the enclosure structure with a data acquisition instrument through a lead and resetting.
And S5, starting all the acquisition channels, and starting testing after the readings of the sensors are debugged without errors. And simultaneously recording the reading of each sensor in the driving process of the pit side vehicle by using a data acquisition instrument, wherein the test time lasts for two or more traffic light periods so as to eliminate the contingency of vehicle load, obtain the difference between the acquired data under the traffic load action and the condition without the traffic load action, and comparing to obtain the influence of the pit side traffic load on the deep foundation pit support structure.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict. In this context, the specific sensor parameters and their relative positions are only mentioned for the sake of clarity and convenience of the technical solution. It should be understood that the use of the parameters described should not limit the scope of what is claimed herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A field test method for the influence of road traffic load on an adjacent foundation pit support structure is characterized by comprising the following steps:
(1) determining a test section: determining a test section according to the actual excavation working condition and the road traffic condition on site;
(2) measuring the soil body pressure under the traffic load, embedding a soil pressure box, and collecting soil body pressure data;
(3) measuring the soil pressure of the enclosure structure;
(4) measuring the acceleration of the pavement and the enclosure structure, and testing the acceleration of the enclosure structure by adopting a low-frequency vibration pickup;
(5) collecting data, recording the reading of each sensor in the driving process of the pit side vehicle by using a data collector, wherein the testing time lasts more than two traffic light periods;
the soil body pressure measurement under the traffic load comprises the following steps:
(1) designing an embedding interval: the position of the embedded soil pressure box groove is positioned on a tire track line in the actual vehicle running process, and the length of the embedded soil pressure box groove and the distance between the soil pressure boxes are determined according to the width of the tire; the distance between the centers of the soil pressure boxes is smaller than the width of the wheels, so that more than two soil pressure boxes can acquire data when the vehicle passes through the area each time;
(2) excavating a soil pressure box embedding groove: the long side of the embedding groove is perpendicular to the tire track line, the long side is more than twice the width of the tire, and the width and the depth are suitable for the size of the soil pressure cell; taking the embedding groove as a starting point, and opening a small groove to the roadside so as to place a lead of the soil pressure cell and connect the data acquisition device;
(3) burying a soil pressure cell: laying a soil pressure box in the constructed embedding groove, filling sand, covering the soil pressure box with the filled sand completely, covering a steel plate on the sand, and embedding the lead in the small groove to recover the passing;
(4) connecting a lead of the soil pressure cell with a data acquisition instrument and resetting;
the method for measuring the soil pressure of the enclosure structure comprises the following steps:
(1) determining the soil pressure test point position of the enclosure structure: determining the soil pressure test points of the enclosure structure on the section by taking the determined test section as a reference, wherein the distance between every two test points is not less than 10 cm;
(2) coring at a fixed point: drilling a hole on the building envelope according to the determined point position and taking out the concrete core;
(3) connecting a soil pressure cell wire with a data acquisition instrument and clearing a zero point;
(4) fixing the soil pressure box: selecting a concrete core with a smoother section, fixing the back of the soil pressure box on the section by using hot melt adhesive, fixing the lead of the soil pressure box on the side wall of the drill core by using transparent adhesive tape paper, and pushing the concrete core back to the enclosure structure; sealing the coring hole with cement slurry on the inner side of the enclosure structure; the back soil of the supporting structure is ensured to be in contact with the front of the soil pressure box, and the soil pressure box is ensured to be fixed.
2. The method for on-site testing the influence of the road traffic load on the enclosure structure of the adjacent foundation pit according to claim 1, wherein the acceleration measurement steps of the road and the enclosure structure are as follows:
(1) determining an acceleration test point position of the building envelope: determining an acceleration test point location of the enclosure structure on the section by taking the determined test section as a reference, wherein the acceleration test point location comprises a pavement test point location and an enclosure structure test point location, the arrangement direction of the pavement test point location is vertical to the enclosure structure, the position of the pavement test point location is determined according to the site traffic condition, no less than three points are needed under the condition that normal traffic is not hindered, and the distance between the points is no less than 10 cm; the building envelope acceleration test point positions are the same as the building envelope soil pressure test point positions and are in one-to-one correspondence;
(2) fixing the low-frequency vibration pickup at a corresponding test point position on the inner side of the enclosure structure by using hot melt adhesive, and ensuring that the test direction of the low-frequency vibration pickup is the same as the normal direction of the inner side of the enclosure structure;
(3) and connecting the low-frequency vibration pickup with a data acquisition instrument through a lead and resetting.
3. The method for on-site testing of the influence of road traffic load on an adjacent foundation pit enclosure structure according to claim 1, wherein the foundation pit enclosure structure comprises: underground continuous walls, cast-in-situ bored piles and occlusive piles.
4. The method for the field test of the influence of the road traffic load on the adjacent foundation pit support structure according to claim 1, wherein the fixed-point coring is performed, after the burying point position of the earth pressure box at the back of the support structure is determined, the drilling is performed to core, a cylindrical drill core with a relatively flat section is selected, the back of the earth pressure box is fixed on the section through hot melt adhesive, a lead is fixed on the side surface of the drill core through adhesive tape, the drill core is pushed into a drill hole at the burying point position, the lead is led out, and finally, a hole opening is sealed through cement mortar.
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| CN101696878B (en) * | 2009-10-23 | 2011-01-05 | 山东省交通科学研究所 | Method for detecting stress and strain of road surface |
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Effective date of registration: 20200818 Address after: 310000 259 room 2, 1 building, 1 1 Binan Road, Binjiang District, Hangzhou, Zhejiang. Patentee after: HANGZHOU FUSHIDE GEOTECHNICAL Co.,Ltd. Address before: 330031 Jiangxi city of Nanchang Province East Shuanggang Street No. 808 Patentee before: East China Jiaotong University |