CN111733787B - Method and system for detecting karst cave treatment effect in bridge pile foundation construction process - Google Patents
Method and system for detecting karst cave treatment effect in bridge pile foundation construction process Download PDFInfo
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- CN111733787B CN111733787B CN202010408189.3A CN202010408189A CN111733787B CN 111733787 B CN111733787 B CN 111733787B CN 202010408189 A CN202010408189 A CN 202010408189A CN 111733787 B CN111733787 B CN 111733787B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Abstract
The invention discloses a method and a system for detecting the karst cave treatment effect in the bridge pile foundation construction process, wherein the method comprises a temperature field change monitoring system and a bridge pile foundation-soil-karst cave temperature field simulation model system, temperature data in the bridge pile foundation construction process is obtained through the temperature field change monitoring system, the concrete amount and each thermal coefficient parameter of the karst cave area in the bridge pile foundation-soil-karst cave temperature field simulation model are continuously debugged, node temperature simulation data corresponding to the position of a temperature sensor in a field test are extracted, whether the field data are consistent with the simulation data is observed, the accuracy of the temperature field simulation model is verified by utilizing the field monitoring temperature data, the concrete pouring amount of the karst cave area can be determined according to the simulation model consistent with the field monitoring data, and the concrete over-square amount in the karst cave area is obtained, therefore, the processing effect of the karst cave processing technology adopted in the current place is judged.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to a method and a system for detecting karst cave treatment effect in a bridge pile foundation construction process.
Background
The method comprises the steps of drilling a pile foundation hole of a test point to a specified depth in the construction process of the highway bridge pile foundation, cleaning the hole, placing a reinforcement cage after the slurry performance index of the pile foundation hole meets the requirement, then pouring concrete, meeting various karst geological conditions in the drilling construction process, carrying out common karst cave treatment technical methods in the pile foundation construction process, wherein the common karst cave treatment technical methods comprise a rubble clay throwing and filling method, a grouting method, a steel casing follow-up method, a slurry wall building method and the like, and determining a reasonable and economic karst cave treatment technical method according to the field actual condition and the karst development condition.
The quality of the processing effect of the karst cave processing technical scheme in the karst region has great influence on the construction quality and the construction efficiency of the bridge pile foundation and the later-stage operation stability and the safety of the bridge, so that the processing effect of the adopted karst cave processing technology needs to be accurately detected and evaluated, and reliable experience can be provided for the karst cave processing technology under the similar karst condition.
In the prior art, physical detection technology is mostly adopted for detecting the karst cave processing effect, and the defects of small detection depth, low detection precision and high detection cost exist.
Disclosure of Invention
The invention mainly aims to provide a method and a system for detecting the karst cave treatment effect in the bridge pile foundation construction process, so as to solve the problem of the detection depth of the karst cave treatment effect in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for detecting a karst cave treatment effect during a bridge pile foundation construction process, including the steps of:
(a) selecting a test bridge pile foundation as a test point according to drilling histogram data in an engineering geological survey report of the bridge site area;
(b) determining the arrangement spacing between the temperature sensors on the reinforcement cage according to the karst cave number, burial depth and cave height characteristics at the position of the test point, and arranging the temperature sensors according to the arrangement spacing, wherein at least 1 temperature sensor is arranged in the karst cave region;
(c) during concrete pouring, acquiring temperature data monitored on site through a temperature sensor and transmitting the temperature data monitored on site to a server;
(d) the server stores the temperature data monitored on site and calls or stores the temperature data by the monitoring computer.
(e) Establishing a simulation model of the bridge pile foundation-soil-karst cave temperature field by utilizing finite element calculation software according to a drilling histogram in an engineering geological survey report of a test point, the length and the diameter of the bridge pile foundation, and the specific heat capacity, the heat conductivity coefficient, the temperature conductivity coefficient and the thermal expansion coefficient thermal coefficient of pile foundation concrete and each soil layer;
(f) continuously debugging the concrete amount and each thermal coefficient parameter of a karst cave area in a bridge pile foundation-soil-karst cave temperature field simulation model, extracting node temperature simulation data corresponding to the position of a temperature sensor in a field test, observing whether the field data is consistent with the simulation data or not, and verifying the accuracy of the temperature field simulation model by utilizing the field monitoring temperature data;
(g) and determining the concrete pouring amount of the karst cave area according to the simulation model matched with the field monitoring data, so as to obtain the concrete over-square amount of the karst cave area, and judging the treatment effect of the karst cave treatment technology adopted on the field.
Furthermore, the temperature sensors are symmetrically tied up on the main reinforcement of the bridge pile foundation reinforcement cage at intervals.
Furthermore, the temperature sensor is connected with the server through a multi-channel data automatic acquisition device, and the multi-channel data automatic acquisition device is connected with the temperature sensor through a cable. .
Further, the temperature sensor is a semiconductor thermistor sensor.
In order to achieve the above object, according to another aspect of the present invention, there is provided a system for detecting a karst cave treatment effect during a bridge pile foundation construction process, including:
temperature field change monitoring system: the system comprises temperature sensors fixed on a bridge pile foundation at intervals, a data acquisition device connected with the temperature sensors, and a server connected with the data acquisition device, wherein the server is connected with a monitoring computer;
a simulation model system of a bridge pile foundation-soil-karst cave temperature field;
the layout interval of the temperature sensors on the bridge pile foundation is determined by the number of karst caves, the burial depth and the cave height at the position of a test point.
Furthermore, the temperature sensors are symmetrically tied up on the main reinforcement of the bridge pile foundation reinforcement cage at intervals.
Furthermore, the data acquisition device is a multi-channel automatic data acquisition device, and the multi-channel automatic data acquisition device is connected with the temperature sensor through a cable.
Further, the temperature sensor is a semiconductor thermistor sensor.
Further, the bridge pile foundation-soil-karst cave thermodynamic indoor simulation model is established by utilizing finite element calculation software.
Furthermore, the server is connected with the monitoring computer through a data transmission module.
It can be seen that, in summary, the advantages of the present invention over the prior art are:
1. the method is characterized in that a bridge pile foundation temperature field on-site monitoring system and an indoor simulation system are organically combined, the accuracy of a simulation model is verified by utilizing on-site monitoring data, and the concrete pouring amount of a karst cave region is determined from two aspects of test data and theoretical analysis, so that the concrete over-square amount of the karst cave region is accurately calculated, the effect of accurately evaluating the processing effect of the adopted karst cave processing technology is achieved, and reliable experience can be provided for the karst cave processing technical scheme similar to the karst geological condition;
2. the defect of the existing physical detection technology is effectively overcome, the detection cost of the karst cave processing effect is reduced, and the detection efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
fig. 1 is a temperature field change monitoring system.
The relevant references in the above figures are:
1-a temperature sensor;
2-a cable;
3-automatic multichannel data acquisition unit;
4-a server;
5-monitoring the computer;
6-a reinforcement cage;
7-bridge pile foundation.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only examples of a part of the present invention, and not all examples. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
The simulation system for the bridge pile foundation-soil-karst cave temperature field is a numerical simulation model of the bridge pile foundation temperature field established based on the basic theory of concrete hydration heat calculation, the heat conduction theory and the basic theory of the temperature field, and can effectively reflect the distribution rule of the early-age concrete temperature field of the bridge pile foundation along with the change of the age. The establishment of the system simulation model requires the buried depth of the karst cave, the height of the karst cave, the type and thickness field data of soil layers, and the specific heat capacity, the heat conductivity coefficient, the thermal conductivity coefficient and the thermal expansion coefficient of pile foundation concrete.
The invention discloses a method for detecting karst cave treatment effect in the construction process of a bridge pile foundation, which is characterized by comprising the following steps of:
(a) selecting a test bridge pile foundation as a test point according to drilling histogram data in an engineering geological survey report of the bridge site area;
(b) determining the arrangement spacing between the temperature sensors on the reinforcement cage according to the karst cave number, burial depth and cave height characteristics at the position of the test point, and arranging the temperature sensors according to the arrangement spacing, wherein at least 1 temperature sensor is arranged in the karst cave region;
(c) during concrete pouring, acquiring temperature data monitored on site through a temperature sensor and transmitting the temperature data monitored on site to a server;
(d) the server stores the temperature data monitored on site and calls or stores the temperature data by the monitoring computer.
(e) Establishing a simulation model of the bridge pile foundation-soil-karst cave temperature field by utilizing finite element calculation software according to a drilling histogram in an engineering geological survey report of a test point, the length and the diameter of the bridge pile foundation, and the specific heat capacity, the heat conductivity coefficient, the temperature conductivity coefficient and the thermal expansion coefficient thermal coefficient of pile foundation concrete and each soil layer;
(f) continuously debugging the concrete amount and each thermal coefficient parameter of a karst cave area in a bridge pile foundation-soil-karst cave temperature field simulation model, extracting node temperature simulation data corresponding to the position of a temperature sensor in a field test, observing whether the field data is consistent with the simulation data or not, and verifying the accuracy of the temperature field simulation model by utilizing the field monitoring temperature data;
(g) and determining the concrete pouring amount of the karst cave area according to the simulation model matched with the field monitoring data, so as to obtain the concrete over-square amount of the karst cave area, and judging the treatment effect of the karst cave treatment technology adopted on the field.
The temperature sensors are symmetrically tied up on the main reinforcement of the bridge pile foundation reinforcement cage at intervals.
The temperature sensor is connected with the server through a multi-channel data automatic collector, and the multi-channel data automatic collector is connected with the temperature sensor through a cable.
The temperature sensor is a semiconductor thermistor sensor.
Detection system of karst cave treatment effect in bridge pile foundation work progress includes:
temperature field change monitoring system: the system comprises temperature sensors 1 fixed on a bridge pile foundation 7 at intervals, a data acquisition device connected with the temperature sensors 1, a server 4 connected with the data acquisition device, and a monitoring computer 5 connected with the server 4;
a simulation model system of a bridge pile foundation-soil-karst cave temperature field;
the layout distance of the temperature sensors 1 on the bridge pile foundation 7 is determined by the number of karst caves, the burial depth and the cave height at the position of a test point.
The temperature sensors 1 are symmetrically tied up on the main reinforcement of the bridge pile foundation reinforcement cage 6 at intervals.
The data acquisition device is a multi-channel data automatic acquisition device 3, and the multi-channel data automatic acquisition device 3 is connected with the temperature sensor through a cable 2.
The temperature sensor 1 is a semiconductor thermistor sensor.
The bridge pile foundation-soil-karst cave thermodynamic indoor simulation model is established by using finite element calculation software.
The server 4 is connected with the monitoring computer 5 through a data transmission module.
When the invention is used for manufacturing a pile foundation reinforcement cage, the distance between temperature sensors 1 is symmetrically fixed on a reinforcement cage 6 by using an iron wire or a binding belt, the distance and the number of the temperature sensors 1 depend on the number of on-site karst caves, the buried depth, the height of the cave and the length of the pile foundation, then a cable 2 is fixed along the reinforcement cage 6 and is pulled out to be connected with a temperature sensor access module of a multi-channel data automatic collector, then a data acquisition module of the multi-channel data automatic collector 3 synchronously acquires the temperature sensors 1 of all channels and transmits the acquired data to a server 4 by a data transmission module for storage, a monitoring computer 5 can store and real-timely call temperature data in the server, continuously debug the concrete amount and each thermal coefficient parameter of the karst cave area in a bridge-soil-karst cave temperature field simulation model, extract node temperature simulation data corresponding to the position of the temperature sensors in an on-site test, observing whether the comparison field data is matched with the simulation data or not, and verifying the accuracy of the temperature field simulation model by utilizing the field monitoring temperature data; and determining the concrete pouring amount of the karst cave area according to the simulation model matched with the field monitoring data, so as to obtain the concrete over-square amount of the karst cave area, and judging the treatment effect of the karst cave treatment technology adopted on the field.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (9)
1. The method for detecting the karst cave treatment effect in the bridge pile foundation construction process is characterized by comprising the following steps of:
(a) selecting a test bridge pile foundation as a test point according to drilling histogram data in an engineering geological survey report of the bridge site area;
(b) determining the arrangement spacing between the temperature sensors on the reinforcement cage according to the karst cave number, burial depth and cave height characteristics at the position of the test point, and arranging the temperature sensors according to the arrangement spacing, wherein at least 1 temperature sensor is arranged in the karst cave region;
(c) during concrete pouring, acquiring temperature data monitored on site through a temperature sensor and transmitting the temperature data monitored on site to a server;
(d) the server stores the temperature data monitored on site and calls or stores the temperature data by a monitoring computer;
(e) establishing a simulation model of the bridge pile foundation-soil-karst cave temperature field by utilizing finite element calculation software according to a drilling histogram in an engineering geological survey report of a test point, the length and the diameter of the bridge pile foundation, and the specific heat capacity, the heat conductivity coefficient, the temperature conductivity coefficient and the thermal expansion coefficient thermal coefficient of pile foundation concrete and each soil layer;
(f) continuously debugging the concrete amount and each thermal coefficient parameter of a karst cave area in a bridge pile foundation-soil-karst cave temperature field simulation model, extracting node temperature simulation data corresponding to the position of a temperature sensor in a field test, observing whether the field data is consistent with the simulation data or not, and verifying the accuracy of the temperature field simulation model by utilizing the field monitoring temperature data;
(g) and determining the concrete pouring amount of the karst cave area according to the simulation model matched with the field monitoring data, so as to obtain the concrete over-square amount of the karst cave area, and judging the treatment effect of the karst cave treatment technology adopted on the field.
2. The method for detecting the karst cave treatment effect in the bridge pile foundation construction process according to claim 1, wherein the temperature sensors are symmetrically bundled on the main reinforcement of the reinforcement cage of the bridge pile foundation at intervals.
3. The method for detecting the karst cave treatment effect in the bridge pile foundation construction process according to claim 1, wherein the temperature sensor is connected with the server through a multi-channel data automatic acquisition device, and the multi-channel data automatic acquisition device is connected with the temperature sensor through a cable.
4. The method for detecting the karst cave treatment effect in the bridge pile foundation construction process according to claim 1, wherein the temperature sensor is a semiconductor thermistor sensor.
5. Karst cave treatment effect detecting system in bridge pile foundation work progress, its characterized in that includes:
temperature field change monitoring system: the system comprises temperature sensors (1) fixed on a bridge pile foundation (7) at intervals, a data acquisition device connected with the temperature sensors (1), a server (4) connected with the data acquisition device, and a monitoring computer (5) connected with the server (4);
the bridge pile foundation-soil-karst cave temperature field simulation model system is a simulation model system which is established by utilizing finite element calculation software according to a drilling histogram in an engineering geological survey report of a test point, the length and the diameter of the bridge pile foundation, and the specific heat capacity, the heat conductivity coefficient, the thermal expansion coefficient and the thermal engineering coefficient of pile foundation concrete and each soil layer; extracting node temperature simulation data corresponding to the position of the temperature sensor in a field test by continuously debugging the concrete amount and each thermal coefficient parameter of a karst cave area in the bridge pile foundation-soil-karst cave temperature field simulation model, observing whether the field data is consistent with the simulation data, and verifying the accuracy of the temperature field simulation model by utilizing the field monitoring temperature data; the simulation model system can determine the concrete pouring amount of the karst cave region according to the simulation model matched with the field monitoring data so as to obtain the concrete over-square amount of the karst cave region and judge the treatment effect of the karst cave treatment technology adopted on the field;
the layout distance of the temperature sensors (1) on the bridge pile foundation is determined by the number of karst caves, the burial depth and the cave height at the position of a test point, and at least 1 temperature sensor is arranged in a karst cave region.
6. The system for detecting the karst cave treatment effect in the bridge pile foundation construction process according to claim 5, wherein the temperature sensors (1) are symmetrically tied on the main reinforcement of the reinforcement cage (6) of the bridge pile foundation (7) at intervals.
7. The system for detecting the karst cave treatment effect in the bridge pile foundation construction process according to claim 5, wherein the data acquisition device is a multi-channel data automatic acquisition unit (3), and the multi-channel data automatic acquisition unit (3) is connected with the temperature sensor through a cable (2).
8. The system for detecting the karst cave treatment effect in the bridge pile foundation construction process according to claim 5, wherein the temperature sensor (1) is a semiconductor thermistor sensor.
9. The system for detecting the karst cave treatment effect in the bridge pile foundation construction process according to claim 5, wherein the server (4) is connected with the monitoring computer (5) through a data transmission module.
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