CN111255439A - Self-heating optical fiber device and method for judging sealing quality of clay ball on side wall of pressure reduction well - Google Patents
Self-heating optical fiber device and method for judging sealing quality of clay ball on side wall of pressure reduction well Download PDFInfo
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- CN111255439A CN111255439A CN202010070810.XA CN202010070810A CN111255439A CN 111255439 A CN111255439 A CN 111255439A CN 202010070810 A CN202010070810 A CN 202010070810A CN 111255439 A CN111255439 A CN 111255439A
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- well
- optical cable
- depressurization
- side wall
- temperature measuring
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Abstract
The invention relates to a self-heating optical fiber device and a self-heating optical fiber method for judging clay ball sealing quality of a side wall of a depressurization well. Compared with the prior art, the method can conveniently and quickly evaluate the quality of the clay ball hole sealing in the well forming process of each pressure reduction well by using an optical fiber temperature measurement technology before the foundation pit descends, and can quickly locate the defect position if the clay ball hole sealing has a seepage defect so as to guide the pressure reduction well to carry out seepage treatment on the confined water.
Description
Technical Field
The invention belongs to the technical field of geological engineering, geotechnical engineering and foundation pit engineering, relates to well wall leakage monitoring, and particularly relates to a self-heating optical fiber device and a method for judging the sealing quality of clay balls on the side wall of a depressurization well.
Background
In the construction environment with higher underground water level, well point dewatering is an important technical measure in the construction of earthwork, foundation and foundation engineering, can drain water in foundation soil, promote soil consolidation, improve foundation strength, simultaneously can reduce soil slope soil lateral displacement and settlement, stabilize side slope, eliminate sand running, reduce uplift of foundation soil, avoid the influence of underground water in the construction of foundation and foundation engineering below natural underground water, provide drier construction conditions, reduce earthwork amount, shorten construction period, improve engineering quality and ensure construction safety. However, the pressure reducing well is limited by construction conditions in the well forming process, the condition that the clay ball sealing quality is not ideal often occurs, pressure-bearing water at the bottom of the well pipe leaks to the ground surface through the pipe wall through the clay ball, and the well can become a seepage passage even due to long-time seepage so as not to play a pressure reducing role. At present, a detection method aiming at clay ball sealing quality is not considered in a construction process of a depressurization well, a pump pipe can be installed for trial water pumping after a well is washed after clay ball sealing, the position of a defect generated by clay ball sealing needs to be determined urgently, and the defect is processed in time to prevent the depressurization well from losing efficacy and conduct research.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a self-heating optical fiber device and a method for judging the sealing quality of a clay ball on the side wall of a pressure reduction well. And the self-heating optical cable is used for judging the sealing quality of the clay ball on the side wall of the pressure reducing well by measuring the temperature change abnormity of the optical cable arranged on the side wall of the pressure reducing well.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a self-heating optical fiber device for judging clay ball sealing quality of a side wall of a depressurization well, which comprises a heating type armored temperature measuring optical cable and a distributed optical fiber temperature sensing system (DTS), wherein the heating type armored temperature measuring optical cable spirally surrounds the side wall of the depressurization well from bottom to top, and the top end of the heating type armored temperature measuring optical cable is exposed out of the ground and is connected with the distributed optical fiber temperature sensing system. The DTS system can realize real-time temperature monitoring and high/low temperature alarm.
Preferably, every time a preset length is added along the length direction from the bottom end of the depressurization well, the heating type armored temperature measuring optical cable surrounds the outer circumference of the side wall of the depressurization well.
Preferably, the cross section of the heating type armored temperature measuring optical cable is in a flat oval shape and comprises a central beam tube, a sensing optical fiber and a water-blocking filler which are arranged in the central beam tube, an insulating layer which surrounds the outside of the central beam tube and an outer sheath which surrounds the outside of the insulating layer and is embedded with a heating copper wire reinforcing piece.
Preferably, the heating type armored temperature measuring optical cable is fixed outside the pressure reduction well side wall through an iron wire or an iron sheet, and the iron wire or the iron sheet is directly welded on the pressure reduction well side wall.
The invention provides a method for judging the clay ball sealing quality of the side wall of a depressurization well, which adopts the device, wherein the depressurization well is composed of a plurality of butted well pipes, and the method comprises the following steps:
s1: arranging a heating type armored temperature measuring optical cable on a section of well pipe at the bottom end, reserving the length which can be connected to the ground surface, and coiling the reserved optical cable on the top end of the section of well pipe;
s2: after the section of well pipe is hoisted and placed into the dewatering well and two sections of well pipes are butted, fixing the reserved optical cable on the pipe wall of the section of well pipe in a spiral shape along with the next section of well pipe during hoisting and placing, and repeating the operation until the hoisting and placing of the well pipe are completed;
s3: when the pressure reducing well operates, in the process of pumping water and reducing pressure, the heating type armored temperature measuring optical cable is electrified to be heated, the heating type armored temperature measuring optical cable exposed out of the ground surface is connected with the distributed optical fiber temperature sensing system, the heating abnormality of the heating type armored temperature measuring optical cable at different positions of the pressure reducing well is detected, the seepage position of the outer wall of the well pipe is determined according to the heating abnormality, and then the sealing quality of clay balls on the side wall of the pressure reducing well is judged.
Preferably, the pressure reducing well which is used in engineering is used, the well mouth is higher than the bottom surface by 0.5m, gravel materials are filled outside the pressure-bearing water layer filter pipe, and clay ball filling seals are arranged outside the well wall at other positions.
Preferably, from the depressurization well bottom end along the length direction, every time one meter of length is increased, the heating type armored temperature measuring optical cable surrounds the depressurization well side wall for a circle, and the corresponding relation between the optical cable length and the well pipe position is as follows from the well pipe orifice:
wherein: l represents the cable length from the wellhead; h represents the length of the well pipe from the mouth of the well pipe; r represents the actual well pipe radius.
Preferably, in step S3, in the process of pumping water and reducing pressure, 50-150V of alternating current is applied to the heating type armored temperature measuring optical cable, and the temperature of the optical cable is increased to 30-70 ℃ after the alternating current is applied.
Compared with the prior art, the invention has the following beneficial effects:
the invention can conveniently and rapidly evaluate the quality of the clay ball hole sealing in the well forming process of each depressurization well by using an optical fiber temperature measurement technology before the foundation pit descends, and if the clay ball hole sealing has a seepage defect, the defect position can be rapidly positioned, so as to guide the pressure-bearing water seepage treatment work of the depressurization well. When the foundation pit lowers water, the water level is lowered below the excavation surface, which is a necessary condition for smooth excavation of the foundation pit, if the water lowering effect cannot meet the requirement due to the problem of the well quality of the depressurization well, the construction period is delayed, even construction accidents occur, the clay ball sealing quality can be observed conveniently by introducing the procedure of installing the self-heating optical cable measuring device in the depressurization well construction process, and a new thought can be provided for the foundation pit water lowering construction process.
Drawings
FIG. 1 is a schematic view of a self-warming fiber optic device of the present invention;
FIG. 2 is a schematic cross-sectional view of a heated armored temperature measuring cable according to the present invention.
In the figure, 1 is a pressure reduction well, 2 is a heating type armored temperature measurement optical cable, 3 is an iron sheet, 4 is a filled clay ball, 5 is a filled gravel material, 6 is a distributed optical fiber temperature sensing system, 7 is a sensing optical fiber, 8 is a central beam tube, 9 is a heating copper wire reinforcement, 10 is an insulating layer, and 11 is an outer sheath.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A self-heating optical fiber device for judging clay ball sealing quality of a side wall of a depressurization well is shown in figure 1 and comprises a heating type armored temperature measuring optical cable 2 and a distributed optical fiber temperature sensing system 6, wherein the heating type armored temperature measuring optical cable 2 spirally surrounds the side wall of the depressurization well 1 from bottom to top, and the top end of the heating type armored temperature measuring optical cable is exposed out of the ground and is connected with the distributed optical fiber temperature sensing system 6 (DTS in the prior art). The DTS system can realize real-time temperature monitoring and high/low temperature alarm
In the embodiment, the depressurization well 1 which is used in engineering is adopted, the size and the length of a specific well pipe are comprehensively considered according to factors such as an actual bearing water head and the precipitation amount on site, and a well mouth is higher than the ground by 0.50m based on an actual construction design scheme so as to prevent surface sewage from permeating into the well. The gravel filling material 5 is arranged outside the pressure-bearing water layer water filtering pipe, and the filling clay balls 4 are arranged outside the well wall at other positions for sealing.
The cross section of the heating type armored temperature measuring optical cable 2 (self-heating optical cable) is in a flat oval shape and comprises a central beam tube 8 (preferably adopting a seamless steel tube), a sensing optical fiber 7 and a water-blocking filler which are arranged in the central beam tube 8, an insulating layer 10 which surrounds the outside of the central beam tube 8 and an outer sheath 11 (preferably adopting PE material) which surrounds the outside of the insulating layer 10 and is embedded with a heating copper wire reinforcement 9. The optical cable has good bending resistance, scratch resistance and signal transmission performance, and can be widely applied to engineering detection. The self-heating optical cable is arranged spirally and upwards from the bottom of the well pipe around the outer wall of the well pipe of the pressure reducing well, and in order to facilitate determining the position relation between the length of the optical cable and the pipe wall of the well pipe, in the embodiment, the heating type armored temperature measuring optical cable 2 surrounds the outer circle of the side wall of the pressure reducing well 1 along the length direction of the bottom end of the pressure reducing well 1 preferably. Preferably, the heating armored temperature measuring optical cable surrounds the outer circumference of the side wall of the depressurization well along the length direction of the depressurization well bottom end every time when the length is increased by one meter, and the corresponding relation between the length of the optical cable and the position of the well pipe is as follows from the pipe orifice of the well pipe:
wherein: l represents the cable length from the wellhead; h represents the length of the well pipe from the mouth of the well pipe; r represents the actual well pipe radius.
The heating type armored temperature measuring optical cable 2 is preferably fixed outside the side wall of the pressure reduction well 1 through an iron wire or an iron sheet 3, the fixing effect is achieved, and the iron wire or the iron sheet 3 is directly welded on the side wall of the pressure reduction well 1.
The method for judging the sealing quality of the clay balls on the side wall of the depressurization well is characterized in that by adopting the device, the design depth of the depressurization well 1 is determined according to the depth of an underground confined water aquifer of an actual engineering site, the depth of the depressurization well 1 generally reaches dozens of meters, the well pipe needs to be hoisted and lowered in a segmented mode when being hoisted and lowered, the well pipe is welded in the segmented position in the hoisting and lowering process, and the optical cable is fixed on the side wall of the well pipe in the hoisting and lowering.
The method comprises the following steps:
s1: arranging a heating type armored temperature measuring optical cable on a section of well pipe at the bottom end, reserving the length which can be connected to the ground surface, and coiling the reserved optical cable on the top end of the section of well pipe;
s2: after the section of well pipe is hoisted and placed into the dewatering well and two sections of well pipes are butted, fixing the reserved optical cable on the pipe wall of the section of well pipe in a spiral shape along with the next section of well pipe during hoisting and placing, and repeating the operation until the hoisting and placing of the well pipe are completed;
s3: when the pressure reducing well operates, in the process of pumping water and reducing pressure, the heating type armored temperature measuring optical cable is electrified to be heated, the heating type armored temperature measuring optical cable exposed out of the ground surface is connected with the distributed optical fiber temperature sensing system, the heating abnormality of the heating type armored temperature measuring optical cable at different positions of the pressure reducing well is detected, the seepage position of the outer wall of the well pipe is determined according to the heating abnormality, and then the sealing quality of clay balls on the side wall of the pressure reducing well is judged.
In the preferred step S3 in this embodiment, in the process of pumping water and reducing pressure, 50-150V ac is supplied to the heating armored temperature measuring cable (the specific voltage is determined according to the actual layout length of the heating cable), and the temperature of the cable is increased to 30-70 ℃ after power is supplied.
During the whole optical cable laying process, attention should be paid to avoid optical cable broken fibers caused by stretching or extrusion of a well wall.
The invention can conveniently and rapidly evaluate the quality of the clay ball hole sealing in the well forming process of each depressurization well by using an optical fiber temperature measurement technology before the foundation pit descends, and if the clay ball hole sealing has a seepage defect, the defect position can be rapidly positioned, so as to guide the pressure-bearing water seepage treatment work of the depressurization well. When the foundation pit lowers water, the water level is lowered below the excavation surface, which is a necessary condition for smooth excavation of the foundation pit, if the water lowering effect cannot meet the requirement due to the problem of the well quality of the depressurization well, the construction period is delayed, even construction accidents occur, the clay ball sealing quality can be observed conveniently by introducing the procedure of installing the self-heating optical cable measuring device in the depressurization well construction process, and a new thought can be provided for the foundation pit water lowering construction process.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. The self-heating optical fiber device for judging the clay ball sealing quality of the side wall of the depressurization well is characterized by comprising a heating type armored temperature measuring optical cable (2) and a distributed optical fiber temperature sensing system (6), wherein the heating type armored temperature measuring optical cable (2) spirally surrounds the side wall of the depressurization well (1) from bottom to top, and the top end of the heating type armored temperature measuring optical cable is exposed out of the ground and is connected with the distributed optical fiber temperature sensing system (6).
2. The self-heating optical fiber device for judging the sealing quality of the clay ball on the side wall of the depressurization well according to claim 1, wherein the heating type armored temperature measuring optical cable (2) surrounds the outer circumference of the side wall of the depressurization well (1) every time a preset length is added along the length direction from the bottom end of the depressurization well (1).
3. The self-heating optical fiber device for judging clay ball sealing quality of the side wall of a depressurization well according to claim 1, wherein the cross section of the heating type armored temperature measuring optical cable (2) is in a flat ellipse shape and comprises a central beam tube (8), a sensing optical fiber (7) and a water-blocking filler which are arranged in the central beam tube (8), an insulating layer (10) surrounding the central beam tube (8) and an outer sheath (11) surrounding the insulating layer (10) and embedded with a heating copper wire reinforcement (9).
4. The self-heating optical fiber device for judging the clay ball sealing quality of the side wall of the depressurization well according to claim 1, wherein the heating type armored temperature measuring optical cable (2) is fixed outside the side wall of the depressurization well (1) through an iron wire or an iron sheet (3), and the iron wire or the iron sheet (3) is directly welded on the side wall of the depressurization well (1).
5. A method for judging clay ball sealing quality of a side wall of a depressurization well, which is characterized in that the device of any one of claims 1 to 4 is adopted, and the depressurization well (1) is composed of a plurality of butted well pipes, and the method comprises the following steps:
s1: arranging a heating type armored temperature measuring optical cable on a section of well pipe at the bottom end, reserving the length which can be connected to the ground surface, and coiling the reserved optical cable on the top end of the section of well pipe;
s2: after the section of well pipe is hoisted and placed into the dewatering well and two sections of well pipes are butted, fixing the reserved optical cable on the pipe wall of the section of well pipe in a spiral shape along with the next section of well pipe during hoisting and placing, and repeating the operation until the hoisting and placing of the well pipe are completed;
s3: when the pressure reducing well operates, in the process of pumping water and reducing pressure, the heating type armored temperature measuring optical cable is electrified to be heated, the heating type armored temperature measuring optical cable exposed out of the ground surface is connected with the distributed optical fiber temperature sensing system, the heating abnormality of the heating type armored temperature measuring optical cable at different positions of the pressure reducing well is detected, the seepage position of the outer wall of the well pipe is determined according to the heating abnormality, and then the sealing quality of clay balls on the side wall of the pressure reducing well is judged.
6. The method for judging the clay ball sealing quality of the side wall of the pressure reducing well according to claim 5, wherein the pressure reducing well which is started to be used in engineering is used, the well mouth is 0.5m higher than the bottom surface, gravel filling materials are arranged outside a water filtering pipe of a pressure-bearing water layer, and clay ball sealing is arranged outside the well wall at other positions.
7. The method for judging clay ball sealing quality of a sidewall of a depressurization well according to claim 5, wherein for every one meter of increase in length along the length direction from the bottom end of the depressurization well, the heating type armored temperature measuring optical cable surrounds the outer circumference of the sidewall of the depressurization well, and the corresponding relation between the optical cable length and the well pipe position is as follows from the mouth of the well pipe:
wherein: l represents the cable length from the wellhead; h represents the length of the well pipe from the mouth of the well pipe; r represents the actual well pipe radius.
8. The method for judging the clay ball sealing quality of the sidewall of the depressurization well according to claim 5, wherein in the step S3, the heating type armored temperature measuring optical cable is electrified with an alternating current of 50-150V in the process of pumping water and depressurizing, and the temperature of the optical cable is raised to 30-70 ℃ after the alternating current is electrified.
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Cited By (3)
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| CN112177057A (en) * | 2020-09-25 | 2021-01-05 | 上海隧道工程有限公司 | Pressure reducing well and leakage detection method thereof |
| CN113932943A (en) * | 2021-12-16 | 2022-01-14 | 山东省科学院海洋仪器仪表研究所 | Seawater surface layer temperature sensor based on LPG (liquefied Petroleum gas), temperature measuring system and method |
| CN115613610A (en) * | 2022-12-20 | 2023-01-17 | 安徽新建控股集团有限公司 | Method for monitoring flowing state of water flow in well pipe, light well point dewatering device and method |
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