Gypsum karst corrosion in-situ monitoring system and method

Abstract

The invention discloses a gypsum rock corrosion in-situ monitoring system and method.The system comprises a data integration device and a well casing arranged in situ along gypsum rock, the well casing extends to a sandy gravel bottom layer, and a monitoring assembly electrically connected with the data integration device is arranged in the well casing; wherein the monitoring assembly comprises a first monitoring probe arranged between the gypsum rock upper stratum and the gypsum rock stratum, a second monitoring probe arranged in the middle of the gypsum rock stratum and a third monitoring probe arranged between the gypsum rock stratum and the gypsum rock lower stratum. According to the method, real-time corrosion monitoring can be continuously carried out on gypsum rock in situ, the corrosion rate of the gypsum rock is calculated by combining various information parameters of underground water, the corrosion condition of the gypsum rock can be predicted, early warning can be given out before obvious settlement occurs on the ground, major accidents are avoided, meanwhile, information of underground water at different depths is monitored, and the monitoring accuracy is improved. The accuracy of accident prediction is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gypsum karst corrosion monitoring, and particularly relates to a gypsum karst corrosion in-situ monitoring system and method. BACKGROUND

[0002] Gypsum rock belongs to soluble rock and is extremely easy to be rapidly corroded under external influence, thereby triggering geological disasters such as ground subsidence and ground collapse. With the development of urbanization, more and more high-rise buildings, subway lines and stations, and ground source heat pumps are affected by underlying gypsum rock, or even directly built in the underlying gypsum rock. Some survey deep holes have disclosed deep natural gypsum rock and corrosion holes. Due to various unreasonable human engineering activities, the hydrogeology, stress field, temperature field and geochemical field of the underlying gypsum rock are disturbed, thereby accelerating the corrosion of the underlying gypsum rock, and causing abnormal uneven subsidence of upper buildings and subway stations due to accelerated corrosion of the gypsum rock in recent years. At present, the subsidence accidents caused by gypsum rock are mainly analyzed from the engineering geological perspective. Based on the drilling mechanics test, water pressure test, indoor mechanical test and micro-mineral analysis, combined with surface subsidence monitoring and deep subsidence monitoring, the abnormal subsidence problem of the gypsum rock site is analyzed. However, the influence factors of the underground water causing corrosion are less studied, the influence of the properties of the site underground water on the corrosion of the gypsum rock and the ground subsidence is ignored, and the analysis is limited to indoor tests. It is difficult to timely feedback the corrosion condition of the gypsum rock in the real underground environment, and there is a certain lag. Generally, the warning is given after the ground appears obvious subsidence, and the effective reference for actual production and construction cannot be provided. For example, Chinese Invention Patent CN119310261A discloses a test device and test method for simulating gypsum rock karst collapse, Chinese Invention Patent CN117825261A discloses a gypsum corrosion experimental system and method considering spatial seepage characteristics, Chinese Invention Patent CN117330482A discloses a red layer gypsum rock mass corrosion potential evaluation method, and Chinese Invention Patent CN117309735A discloses a batch gypsum rock dynamic water corrosion test method. All of them are limited to indoor simulation tests, and cannot realize continuous, in-situ real-time monitoring and early warning of the gypsum rock corrosion. SUMMARY

[0003] The purpose of the present application is to overcome the defects of the prior art, and provide a gypsum rock corrosion in-situ monitoring system and method, which can realize real-time corrosion monitoring of the gypsum rock in-situ, calculate the corrosion rate of the gypsum rock in combination with various information parameters of the underground water, and predict the corrosion condition of the gypsum rock. The warning can be given before the ground appears obvious subsidence, major accidents can be avoided, and the accuracy of accident prediction can be improved by monitoring the underground water information at different depths.

[0004] The object of the present invention is achieved through the following technical solutions: A gypsum rock dissolution in-situ monitoring system includes a data integration device and a well pipe arranged in-situ along the gypsum rock, the well pipe extending to the sand and gravel bottom layer, and a monitoring component electrically connected to the data integration device is arranged in the well pipe; The monitoring assembly includes a first monitoring probe disposed between the upper gypsum rock formation and the gypsum rock formation, a second monitoring probe disposed in the middle of the gypsum rock formation, and a third monitoring probe disposed between the gypsum rock formation and the lower gypsum rock formation; Through this implementation, that is, the well pipe is arranged in situ along the gypsum rock and penetrates into the sand and gravel bottom layer of the gypsum rock, and the first monitoring probe, the second monitoring probe and the third monitoring probe in the well pipe are used to collect groundwater status information at different depths, and the collected information is transmitted to the data integration device for processing, so as to continuously monitor the dissolution of the gypsum rock in real time in situ, calculate its dissolution rate in combination with various information parameters of the groundwater, and predict its dissolution situation. An early warning can be issued before obvious subsidence occurs on the ground to avoid major accidents. At the same time, groundwater information at different depths is monitored to further improve the accuracy of accident prediction.

[0005] In one embodiment, a dust cover is further provided on the top of the well pipe; Through this implementation, the impact of rainfall or dust on monitoring results is reduced.

[0006] In one embodiment, the monitoring assembly is electrically connected to the data acquisition device via a data harness; In one embodiment, a guardrail is further provided around the well pipe, and the data acquisition device is located inside the guardrail; Through this embodiment, the device is protected by the provided guardrail to avoid damage caused by accidental touch.

[0007] The present invention also provides a method for in-situ monitoring of gypsum rock dissolution, comprising the following steps: Step S1: Arrange a well pipe in situ along the gypsum rock, and set multiple monitoring probes in the well pipe to obtain groundwater status information at different heights in real time; Step S2: Calculating the chemical dissolution rate of gypsum rock based on the groundwater status information obtained in step S1; Step S3, calculating the physical scouring rate of the gypsum rock, and obtaining the gypsum rock dissolution rate according to the chemical dissolution rate of the gypsum rock; Step S4: Obtain the initial compressive strength of the gypsum rock and calculate the current compressive strength of the gypsum rock; Step S5, compare the current compressive strength of the gypsum rock with the design requirement of the compressive strength, if the current compressive strength of the gypsum rock is less than the design requirement of the compressive strength, output a warning signal.

[0008] In one embodiment, in step S1, the groundwater state information is acquired, including: The temperature, flow rate, PH value, sulfate ion concentration and calcium ion concentration of the groundwater are acquired.

[0009] In one embodiment, in step S2, the calculation method of the chemical dissolution rate of the gypsum rock is as follows: ; ; ; ; ; ; ; wherein, is the chemical dissolution rate of the gypsum rock; is the chemical dissolution rate constant; is the flow rate influence term; is the ion concentration influence term; 25℃ , the dissolution enthalpy , the ideal gas constant R = 8.314 × 10 -3 kJ / mol.

[0010] In one embodiment, in step S3, the calculation method of the dissolution rate of the gypsum rock is as follows: ; ; wherein, is the physical erosion rate of the gypsum rock, is the dissolution rate of the gypsum rock; In one embodiment, in step S4, the calculation method of the current compressive strength of the gypsum rock is as follows: ; wherein, is the initial compressive strength of the gypsum rock, is the current compressive strength of the gypsum rock, is the dissolution rate of the gypsum rock; In one embodiment, in step S5, further comprising: The minimum value of the current compressive strength of the gypsum rock at different depths is taken, and compared with the design required compressive strength, if the current compressive strength of the gypsum rock is less than the design required compressive strength, a warning signal is output.

[0011] The present application has the advantages of: The present application provides a gypsum rock corrosion in-situ monitoring system and method, which continuously monitors the real-time corrosion of the gypsum rock in-situ, calculates the corrosion rate of the gypsum rock in combination with various information parameters of the groundwater and can predict the corrosion condition of the gypsum rock, so that a warning can be given before obvious subsidence occurs on the ground, major accidents are avoided, and the information of the groundwater at different depths can be monitored to monitor the corrosion condition of the gypsum rock at different positions, thereby improving the accuracy of accident prediction. BRIEF DESCRIPTION OF DRAWINGS

[0012] Hereinafter, the present application will be described in more detail based on the embodiments and with reference to the accompanying drawings. In which: Figure 1 The system structure schematic diagram of the present application is shown; Figure 2 The monitoring method flow chart of the present application is shown; In the drawings, the same parts use the same reference numerals. The drawings are not in actual proportion.

[0013] Reference numerals: 1-protective fence, 2-data integration device, 3-data harness, 4-dust cover, 5-well pipe, 6-gypsum rock upper stratum, 7-gypsum rock stratum, 8-monitoring probe, 9-gypsum rock lower stratum. DETAILED DESCRIPTION

[0014] The present application will be further described below in combination with the accompanying drawings.

[0015] Example 1 The present application provides a gypsum rock corrosion in-situ monitoring system, as shown in Figure 1 The system comprises a data acquisition device and a well pipe 5 arranged in-situ along the gypsum rock, the well pipe 5 extends to a sandy pebble bottom layer, and the well pipe 5 is provided with a monitoring assembly electrically connected with the data acquisition device; The monitoring assembly comprises a first monitoring probe 8 arranged between the gypsum rock upper stratum 6 and the gypsum rock stratum 7, a second monitoring probe 8 arranged in the middle of the gypsum rock stratum 7, and a third monitoring probe 8 arranged between the gypsum rock stratum 7 and the gypsum rock lower stratum; It should be noted that in the embodiment, the first monitoring probe 8, the second monitoring probe 8 and the third monitoring probe 8 are all used for monitoring the temperature, the flow rate, the PH value, the sulfate ion concentration and the calcium ion concentration of the underground water, the parameter information of the underground water is obtained by using the three monitoring probes 8 located at different depths, the in-situ dissolution condition of the gypsum rock is obtained by using the parameter information of the underground water, the real-time compressive strength attenuation condition of the gypsum rock is obtained by using the dissolution rate, and the early warning can be given when the compressive strength of the gypsum rock at a certain position is less than a preset threshold value, that is, before the obvious subsidence of the ground occurs, so that the major accident can be avoided; Specifically, as shown in the figure, Figure 1 The top of the well pipe 5 is also provided with a dust cover 4, the monitoring assembly is electrically connected with the data acquisition device through a data line bundle 3, the well pipe 5 is also provided with a protective fence 1, and the data acquisition device is located in the protective fence 1. The dust cover 4 is arranged to ensure the accuracy of monitoring, and the protective fence 1 is arranged to effectively protect the equipment and avoid damage caused by accidental touch.

[0016] Embodiment 2 The application also provides a gypsum rock dissolution in-situ monitoring method, as shown in the figure, Figure 2 The method comprises the following steps: Step S1, arranging a well pipe along the gypsum rock in-situ, and arranging a monitoring probe in the well pipe to obtain underground water state information in real time, wherein the underground water state information comprises the temperature, the flow rate, the PH value, the sulfate ion concentration and the calcium ion concentration of the underground water; Step S2, calculating the chemical dissolution rate of the gypsum rock according to the underground water state information obtained in step S1, and the calculation method is as follows: ; ; ; ; ; ; ; wherein, is the chemical dissolution rate of the gypsum rock; is the chemical dissolution rate constant; is the flow rate influence term; is the ion concentration influence term; 25℃ , the dissolution enthalpy , the ideal gas constant R = 8.314 × 10 -3 kJ / mol; Step S3, calculating the physical erosion rate of the gypsum rock, and obtaining the gypsum rock erosion rate according to the chemical dissolution rate of the gypsum rock, in the following manner: The calculation manner of the gypsum rock erosion rate is as follows: ; ; wherein, is the physical erosion rate of the gypsum rock, is the gypsum rock erosion rate; Step S4, obtaining the initial compressive strength of the gypsum rock, and calculating the current compressive strength of the gypsum rock, in the following manner: The calculation manner of the current compressive strength of the gypsum rock is as follows: ; wherein, is the initial compressive strength of the gypsum rock, is the current compressive strength of the gypsum rock, is the gypsum rock erosion rate; Step S5, comparing the current compressive strength of the gypsum rock with the design requirement of the compressive strength, and outputting a warning signal if the current compressive strength of the gypsum rock is less than the design requirement of the compressive strength. It should be noted that in the embodiment, the in-situ real-time monitoring is directly performed on the gypsum rock site, the in-situ dissolution of the gypsum rock is obtained by using the parameter information of the underground water, the surveying borehole can be used as the monitoring hole, the diameter of the hole is not less than 100 mm, the real-time dissolution rate is used to convert the decay of the real-time compressive strength of the gypsum rock, so that the early warning can be issued when the compressive strength of the gypsum rock is less than the preset threshold, i.e., before the obvious subsidence of the ground, to avoid major accidents. In the embodiment, the temperature, flow rate, PH value, sulfate ion concentration and calcium ion concentration parameter information of the underground water are used to realize the in-situ real-time dissolution monitoring of the gypsum rock, and the real-time compressive strength of the gypsum rock can be judged according to the real-time dissolution of the gypsum rock, and the early warning signal can be output before the obvious subsidence of the ground when the real-time compressive strength of the gypsum rock is less than the design requirement of the compressive strength, to protect the safety of people and property and avoid major accidents.

[0017] Embodiment 3 In the embodiment, the same parts as in embodiment 2 are not repeated, and the difference from embodiment 2 is that in the embodiment, a plurality of monitoring probes are used to monitor the underground water information at different depths, for example, three monitoring probes are arranged in the embodiment, including a first monitoring probe arranged between the upper stratum of the gypsum rock and the gypsum rock stratum, a second monitoring probe arranged in the middle of the gypsum rock stratum, and a third monitoring probe arranged between the gypsum rock stratum and the lower stratum of the gypsum rock, that is, the dissolution of the gypsum rock at the positions corresponding to the underground water at different positions is obtained, the minimum value of the compressive strength of the plurality of positions is taken as the comparison value, which is compared with the design requirement of the compressive strength, if it is less than the design requirement of the compressive strength, a warning signal is output, which further ensures the warning effect, avoids major accidents, and reduces the risk control and disposal cost.

[0018] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0019] Although the present application is described herein with reference to particular embodiments, it should be understood that these examples are merely illustrative of the principles and applications of the present application. It should therefore be understood that numerous modifications can be made to the illustrative embodiments, and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It should be understood that the features described in connection with one embodiment can be used in conjunction with other embodiments described herein. It should also be understood that the features described in connection with individual embodiments can be used in other described embodiments.

Claims

1. A gypsum rock dissolution in-situ monitoring system, characterized in that: The device comprises a data integration device and a well pipe arranged in situ along the gypsum rock, the well pipe extending to the sand and gravel bottom layer, and a monitoring component electrically connected to the data integration device is arranged in the well pipe; The monitoring assembly includes a first monitoring probe arranged between the upper gypsum rock stratum and the gypsum rock stratum, a second monitoring probe arranged in the middle of the gypsum rock stratum, and a third monitoring probe arranged between the gypsum rock stratum and the lower gypsum rock stratum.

2. The gypsum rock dissolution in-situ monitoring system according to claim 1, characterized in that: A dust cover is also provided on the top of the well pipe.

3. The gypsum rock dissolution in-situ monitoring system according to claim 1, characterized in that: The monitoring component is electrically connected to the data integration device via a data harness.

4. The gypsum rock dissolution in-situ monitoring system according to claim 1, characterized in that: A guardrail is also provided around the well pipe, and the data integration device is located inside the guardrail.

5. A method for in-situ monitoring of gypsum rock dissolution, characterized in that: The steps include: Step S1: Arrange a well pipe in situ along the gypsum rock, and set multiple monitoring probes in the well pipe to obtain real-time groundwater status information at different depths; Step S2: Calculating the chemical dissolution rate of gypsum rock at different depths based on the groundwater status information obtained in step S1; Step S3, calculating the physical scouring rate of the gypsum rock, and obtaining the gypsum rock dissolution rate according to the chemical dissolution rate of the gypsum rock; Step S4: Obtain the initial compressive strength of the gypsum rock and calculate the current compressive strength of the gypsum rock; Step S5: Compare the current compressive strength of the gypsum rock with the compressive strength required by the design. If the current compressive strength of the gypsum rock is less than the compressive strength required by the design, output a warning signal.

6. The in-situ monitoring method for gypsum rock dissolution according to claim 5, characterized in that: In step S1, groundwater status information is obtained, including: Obtain groundwater temperature, flow rate, pH value, sulfate ion concentration, and calcium ion concentration.

7. The in-situ monitoring method for gypsum rock dissolution according to claim 6, characterized in that: In step S2, the chemical dissolution rate of gypsum rock is calculated as follows: ； ； ； ； ； ； ； in, is the chemical dissolution rate of gypsum rock; is the chemical dissolution rate constant; is the flow velocity influence term; is the ion concentration influence item; at 25℃ , dissolution enthalpy , ideal gas constant R = 8.314 × 10 -3 kJ / mol.

8. The in-situ monitoring method for gypsum rock dissolution according to claim 7, characterized in that: In step S3, the gypsum rock dissolution rate is calculated as follows: ； ； in, is the physical scouring rate of gypsum rock, is the gypsum rock dissolution rate.

9. The in-situ monitoring method for gypsum rock dissolution according to claim 7, characterized in that: In step S4, the current compressive strength of the gypsum rock is calculated as follows: ； in, is the initial compressive strength of gypsum rock, is the current compressive strength of gypsum rock, is the gypsum rock dissolution rate.

10. The in-situ monitoring method for gypsum rock dissolution according to claim 9, characterized in that: In step S5, it also includes: The minimum value of the current compressive strength of gypsum rock at different depths is taken and compared with the design compressive strength. If the current compressive strength of gypsum rock is less than the design compressive strength, a warning signal is output.

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