CN112433044A - Freezing similarity simulation test platform for ultrasonic resistivity parameter of frozen wall development condition - Google Patents
Freezing similarity simulation test platform for ultrasonic resistivity parameter of frozen wall development condition Download PDFInfo
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Abstract
The invention discloses a freezing similarity simulation test platform for an ultrasonic resistivity parameter of a frozen wall development condition, which comprises an ultrasonic testing system, a resistivity testing system, a temperature testing system, a salt water supply system, a clear water supply system, a refrigerating system, a simulation experiment box and a soil layer water replenishing system, wherein the ultrasonic testing system is connected with the temperature testing system through a pipeline; the acquisition ends of the ultrasonic testing system, the resistivity testing system and the temperature testing system are arranged in the simulation experiment box, and the testing ends of the ultrasonic testing system, the resistivity testing system and the temperature testing system receive the data of the acquisition ends of the ultrasonic testing system, the resistivity testing system and the temperature testing system to test. The simulation test system can simulate the ultrasonic-resistivity parameters for the development of the frozen wall under different working conditions such as ground pressure, groundwater replenishment and the like. The ultrasonic-resistivity parameters of the measuring line positions at different moments can be measured through the sounding pipe and the resistivity measuring line, and the development conditions of the frozen wall at different moments are judged by combining temperature measuring data.
Description
Technical Field
The invention relates to the technical field of frozen wall development condition simulation. In particular to a freezing similar simulation test platform for ultrasonic resistivity parameters of the development condition of a frozen wall.
Background
The artificial freezing method is a special stratum reinforcing method for freezing the stratum around the structure to be built into a continuous closed frozen soil body by utilizing an artificial refrigeration technology. The construction method has the advantages of isolating underground water, increasing soil body strength, improving stability, being free of pollution and the like, and is widely applied to mine construction, subway construction, foundation pit and comprehensive pipe gallery construction. However, the current general detection technology for the development condition of the artificial frozen wall mainly depends on a temperature measurement method, so that the coverage area is small, missing detection is easy to generate, the phenomena of abnormal frozen wall and local non-coil are often generated, and hundreds of millions of losses are caused. Therefore, the method for realizing the surface-local-point detection by using a nondestructive detection means has important significance.
The acoustic wave method and the resistivity method are good means for distinguishing the unfrozen soil from the frozen soil, but at present, indoor model test research aiming at the methods is lacked, so that the two methods are still utilized in a freezing construction site. Therefore, research and development of a freezing similarity simulation test device capable of realizing the ultrasonic-resistivity parameter of the development condition of the frozen wall are imperative at present.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a freezing similarity simulation test platform for the ultrasonic resistivity parameter of the development condition of the frozen wall, which has strong applicability and good flexibility.
In order to solve the technical problems, the invention provides the following technical scheme:
the freezing similarity simulation test platform for the ultrasonic resistivity parameter of the development condition of the frozen wall comprises an ultrasonic testing system, a resistivity testing system, a temperature testing system, a saline water supply system, a clear water supply system, a refrigerating system, a simulation experiment box and a soil layer water replenishing system;
an inner soil layer is laid in the simulation experiment box according to the requirements of the simulation soil layer, and soil layer water replenishing systems are arranged on two opposite sides of the inner soil layer;
the water outlet end of the brine tank of the brine supply system is in fluid communication with the water inlet end of a freezing pipe in the simulation experiment box through a brine pump, the water outlet end of the freezing pipe is in fluid communication with a refrigerating machine and a brine inlet end of a condenser of the refrigerating system in sequence, and the brine outlet end of the condenser of the refrigerating system is in fluid communication with the water inlet end of the brine tank of the brine supply system;
the water outlet end of the clean water tank of the clean water supply system is led out through a clean water pump and the water inlet fluid of the water replenishing channel of the soil layer water replenishing system on the inner side of the simulation experiment box, and the water outlet of the water replenishing channel of the soil layer water replenishing system on the inner side of the simulation experiment box is communicated with the water inlet fluid of the clean water tank of the clean water supply system; the water outlet end of the clear water tank is communicated with a clear water inlet end of the condenser through a clear water pump, and the clear water outlet end of the condenser is communicated with a clear water inlet end of the clear water tank through a fluid;
the ultrasonic testing system, the resistivity testing system and the acquisition end of the temperature testing system are installed in the simulation experiment box, and the testing ends of the ultrasonic testing system, the resistivity testing system and the temperature testing system receive data of the ultrasonic testing system, the resistivity testing system and the acquisition end of the temperature testing system to test.
The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition comprises a soil layer water replenishing system and a soil layer water replenishing system, wherein the soil layer water replenishing system comprises a water filtering layer and an iron sand net; the water filtering layer is positioned on the inner side wall of the simulation experiment box at the water inlet of the water replenishing channel and the water outlet of the water replenishing channel, and the iron sand net is positioned between the inner soil layer and the water filtering layer; the water filtering layer is a sand-gravel layer with the thickness of 50-100 mm.
The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the frost wall development condition is characterized in that a water sealing pressurization system is arranged above an inner soil layer (702), the water sealing pressurization system comprises a waterproof layer, a concrete layer and a hydraulic oil cylinder, the waterproof layer is positioned above the inner soil layer, the concrete layer is additionally laid above the waterproof layer under the water replenishing condition, the hydraulic oil cylinder is positioned above the concrete layer, and the power output end of the hydraulic oil cylinder is positioned on the concrete layer; the joint of the concrete layer (706) and the side wall of the simulation experiment box (700) is coated with water-tight or polyurethane; the four outer wall surfaces of the simulation experiment box (700) and the upper part of the concrete layer (706) are wrapped by rubber and plastic heat-insulating plates, and the thickness of each rubber and plastic heat-insulating plate is 2-4 cm.
The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the development condition of the frozen wall comprises a water-impermeable layer, a freezing similarity simulation test platform and a freezing similarity simulation test platform, wherein the water-impermeable layer is a clay layer, and the thickness of the water-impermeable layer is 100-200 mm; the thickness of the concrete layer is 50-200 mm; a reinforcing steel bar is welded on the side wall of the simulation experiment box above the concrete layer; the reinforcing steel bar increases the connectivity between the concrete layer and the simulation experiment box.
The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition is characterized in that on an inner soil layer of the simulation test box: freezing holes and ultrasonic detection holes are formed in the vertical direction, the ultrasonic detection holes are uniformly arranged around the freezing holes, freezing pipes are installed in the freezing holes, and sound detection pipes are installed in the ultrasonic detection holes;
in the middle of the inner soil layer: temperature measuring points are arranged among the freezing holes, among the ultrasonic detection holes and between the freezing holes and the ultrasonic detection holes;
on the impermeable layer: and a resistivity detection point is arranged on the axis between the freezing holes, and a resistivity detection point is arranged on the axis between the freezing holes and the ultrasonic detection hole.
The freezing simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition is characterized in that a test end of the ultrasonic test system is an ultrasonic transducer, an acquisition end of the ultrasonic test system is an ultrasonic acquisition instrument, the ultrasonic transducer is arranged in the acoustic testing tube, and a signal output end of the ultrasonic transducer is in communication connection with a signal input end of the ultrasonic acquisition instrument;
the temperature measuring system comprises a temperature measuring system, a temperature measuring system and a temperature measuring system, wherein the testing end of the temperature testing system is a temperature measuring line, the temperature measuring line is arranged at a temperature measuring point, the acquisition end of the temperature testing system is a temperature acquisition system, and the data output end of the temperature measuring line is in communication connection with the input end of the temperature acquisition system;
the testing end of the resistivity testing system is a resistivity testing line which is arranged at a resistivity detecting point; the acquisition end of the resistivity test system is a resistivity tester, the data output end of the resistivity test line is in communication connection with the input end of the resistivity tester through a cable, and electrodes of the resistivity test line are arranged one by one at intervals of 3-5 cm.
The freezing simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition comprises freezing pipes B2 and B3; the sound measuring tube is A1, A2, A3, A4, B1, B4, C1, C2, C3 and C4, wherein A1, A2, A3 and A4 are on the same straight line, B1, B2, B3 and B4 are on the same straight line, C1, C2, C3 and C4 are on the same straight line, and the straight line composed of A1, A2, A3 and A4, the straight line composed of B1, B2 and B3 and the straight line composed of B4C 1, C2, C3 and C4 are parallel to each other;
meanwhile, A1, B1 and C1, A2, B2 and C2, A3, B3 and C3, A4, B4 and C4 are respectively on the same straight line and are perpendicular to the straight line consisting of A1, A2, A3 and A4, the straight line consisting of B1, B2 and B3 and the straight line consisting of B4C 1, C2, C3 and C4.
The freezing similar simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition comprises the following steps of: temperature measuring points are arranged on the axes among the straight line consisting of A1, A2, A3 and A4, the straight line consisting of B1, B2, B3 and B4 and the straight line consisting of C1, C2, C3 and C4; on the impermeable layer: and resistivity detection points are arranged on the axes among the straight line composed of A1, A2, A3 and A4, the straight line composed of B1, B2, B3 and B4 and the straight line composed of C1, C2, C3 and C4.
The freezing similar simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition comprises the following steps of: temperature measuring points are arranged on the axes of a straight line consisting of A1, B1 and C1, a straight line consisting of A2, B2 and C2, a straight line consisting of A3, B3 and C3, and a straight line consisting of A4, B4 and C4; on the impermeable layer: and a resistivity detection point is arranged on an axis between a straight line composed of A2, B2 and C2 and a straight line composed of A3, B3 and C3.
According to the freezing similarity simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition, a temperature measuring line is arranged at a temperature measuring point (703), and the data output end of the temperature measuring line is in communication connection with the input end of the temperature acquisition system; the data output end of a resistivity test line arranged at the resistivity detection point (714) is in communication connection with the input end of the resistivity tester through a cable, ultrasonic transducers are arranged in the sound measurement tubes A1, A2, A3, A4, B1, B4, C1, C2, C3 and C4, and the signal output ends of the ultrasonic transducers are in communication connection with the signal input end of the ultrasonic acquisition instrument.
The technical scheme of the invention achieves the following beneficial technical effects:
the invention provides a freezing similarity simulation test device for simulating a frozen wall development condition ultrasonic-resistivity parameter, which fully considers working conditions such as different ground pressures, underground water supply and the like and can simulate an open test system and a closed test system. The two detection components of the sounding pipe and the resistivity test line are arranged in actual engineering. Therefore, the actual project can be accurately simulated.
The invention provides a freezing similarity simulation test device for simulating a frozen wall development condition ultrasonic-resistivity parameter. The simulation device is provided with a hydraulic oil cylinder and a clear water supply system, and is provided with a throttle valve for controlling flow, so that the ultrasonic-resistivity parameters for the development of the frozen wall under different working conditions such as ground pressure and groundwater replenishment can be simulated. The ultrasonic-resistivity parameters of the measuring line positions at different moments can be measured through the sounding pipe and the resistivity measuring line, and the development conditions of the frozen wall at different moments are judged by combining temperature measuring data.
Meanwhile, the detachable structure on the upper part of the soil box can realize the arrangement of different freezing pipes, acoustic pipes and resistivity test lines by arranging cement mortar or concrete on the upper part, and further adapt to working conditions of different similar shrinkage ratios (1:2-1:30), acoustic hole positions, resistivity test line arrangement forms and the like. The test bed has strong applicability and good flexibility, and can be applied to construction sites.
Drawings
FIG. 1 is a schematic structural diagram of a freezing similarity simulation test platform for ultrasonic resistivity parameters of a frozen wall development condition according to the present invention;
FIG. 2 is a top view of a freezing similarity simulation test platform for ultrasonic resistivity parameters of a frozen wall development condition according to the present invention;
FIG. 3 is a side view of a freezing similarity simulation test platform for ultrasonic resistivity parameters of a frozen wall development condition according to the present invention;
FIG. 4 is another side view of the freeze simulation test platform for ultrasonic resistivity parameters of frozen wall development in accordance with the present invention;
FIG. 5 is a resistivity cloud chart of unfrozen soil in a freezing similarity simulation test process of an ultrasonic resistivity parameter of a frozen wall development condition according to the invention;
FIG. 6 is a resistivity cloud chart frozen for 4 hours in the freezing simulation test process of the ultrasonic resistivity parameter of the frozen wall development condition of the invention;
FIG. 7 is a resistivity cloud chart frozen for 8 hours in the freezing simulation test process of the ultrasonic resistivity parameter of the frozen wall development condition of the invention;
FIG. 8 is a resistivity cloud chart frozen for 12 hours in the freezing simulation test process of the ultrasonic resistivity parameter of the frozen wall development condition of the invention;
FIG. 9 is a graph of ultrasonic wave velocity and freezing time between freezing holes in a freezing simulation test process of ultrasonic resistivity parameters of a frozen wall development condition according to the present invention.
The reference numbers in the figures denote: 100-ultrasonic testing system; 200-resistivity test system; 201-resistivity test line; 400-a brine supply system; 500-clear water supply system; 600-a refrigeration system; 700-simulation experiment box; 401-brine pump; 402-brine tank; 501-a clean water pump; 502-clear water tank; 601-refrigerator; 602-a refrigerator; 701-a water filtration layer; 702-an inner soil layer; 703-a water inlet of the water replenishing channel; 704-a water outlet of the water replenishing channel; 705-impermeable layer; 706-concrete layer; 707-hydraulic cylinder; 711-freezing tube; 712-acoustic pipe; 713-temperature measurement; 714-resistivity detection point; 715-predict zero degree line.
Detailed Description
The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the frozen wall development condition in the embodiment is shown in fig. 1 and comprises an ultrasonic testing system 100, a resistivity testing system 200, a temperature testing system, a saline water supply system 400, a clear water supply system 500, a refrigerating system 600, a simulation experiment box 700 and a soil layer water replenishing system;
an inner soil layer 702 is laid in the simulation experiment box 700 according to the requirements of the simulation soil layer, and soil layer water replenishing systems are arranged on two opposite sides of the inner soil layer 702;
the water outlet end of the brine tank 402 of the brine supply system 400 is in fluid communication with the water inlet end of a freezing pipe 711 in the simulation experiment box 700 through a brine pump 401, the water outlet end of the freezing pipe 711 is in fluid communication with the brine inlet ends of a refrigerator 602 and a condenser 601 of the refrigeration system 600 in sequence, and the brine outlet end of the condenser 601 of the refrigeration system 600 is in fluid communication with the water inlet end of the brine tank 402 of the brine supply system 400; a brine supply system is used to circulate the freezing tubes.
The water outlet end of the clean water tank 502 of the clean water supply system 500 is led out by fluid of a clean water pump 501 and the water inlet 703 of the water replenishing channel of the soil layer water replenishing system inside the simulation experiment box 700, and the water outlet 704 of the water replenishing channel of the soil layer water replenishing system inside the simulation experiment box 700 is communicated with the water inlet end of the clean water tank 502 of the clean water supply system 500 by fluid; the water outlet end of the clear water tank 502 is in fluid communication with the clear water inlet end of the condenser 601 through the clear water pump 501, and the clear water outlet end of the condenser 601 is in fluid communication with the clear water inlet end of the clear water tank 502; the fresh water supply system 500 is used for simulating the water replenishing channel circulation of the experiment box, and in addition, the fresh water supply system 500 also provides fresh water circulation for the condenser and is used for cooling the refrigerating machine 602.
The ultrasonic testing system 100, the resistivity testing system 200 and the acquisition end of the temperature testing system are installed in the simulation experiment box 700, and the testing ends of the ultrasonic testing system 100, the resistivity testing system 200 and the temperature testing system receive the data of the ultrasonic testing system 100, the resistivity testing system 200 and the acquisition end of the temperature testing system for testing.
The dimensions length, width, and height of the simulation experiment box 700 in this example are: 2m by 1.5m by 1m, which can meet the freezing similarity simulation test of most ultrasonic-resistivity parameters of the 1:2-1:10 frozen wall development conditions; wherein the geometric similarity ratio is Cl(ii) a Density similarity ratio of Cρ(ii) a Ultrasonic wave velocity similarity ratio
Since the resistivity is an inherent property of the object itself, the similarity ratio is 1.
As shown in fig. 3 and 4, the soil layer water replenishing system comprises a water filtering layer 701 and an iron sand net; the water filtering layer 701 is positioned on the inner side wall of the simulation experiment box 700 at the water inlet 703 of the water supplementing channel and the water outlet 704 of the water supplementing channel, and the iron sand net is positioned between the inner soil layer 702 and the water filtering layer 701; the water filtering layer 701 is a sand-gravel layer with the thickness of 50-100 mm.
The water filtering layer 701 and the inner soil layer 702 are separated by an iron gauze, and the water is continuously supplied from the left side to the right side of the simulation experiment box 700. And a flow rate is controlled by adopting a throttle valve between the water outlet end of the clean water tank 502 of the clean water supply system 500 and the water inlet 703 of the water supplementing channel, the water supplementing amount is adjusted according to the change of the soil water content, and the water supplementing amount is calculated according to the water supplementing weight and the water outflow quality difference.
As shown in fig. 3, the water-sealing pressurization system comprises an impermeable layer 705, a concrete layer 706 and a hydraulic oil cylinder 707, wherein the impermeable layer 705 is positioned above an inner soil layer 702, the concrete layer 706 is additionally laid above the impermeable layer 705 under a water replenishing condition, the hydraulic oil cylinder 707 is positioned above the concrete layer 706, and a power output end of the hydraulic oil cylinder 707 is positioned on the concrete layer 706. The impermeable layer 705 is a clay layer, and the thickness of the impermeable layer 705 is 100-200 mm; ensure that water does not leak in the experimental process.
Under the condition of water supplement, a concrete layer 706 is laid above the impervious layer 705. Under the condition of not supplementing water, a concrete layer is not added. The thickness of the concrete layer 706 is 50 mm; reinforcing steel bars are welded on the side wall of the simulation experiment box 700 above the concrete layer 706; the reinforcing bars increase the connectivity between the concrete layer 706 and the simulation experiment box 700. The joint of the concrete layer (706) and the side wall of the simulation experiment box (700) is coated with water-tight or polyurethane; the joint is filled with the leakage-proof glue to prevent the water from leaking from the upper part of the experimental device. The four outer wall surfaces of the simulation experiment box (700) and the upper part of the concrete layer (706) are wrapped by rubber and plastic heat-insulating plates, and the thickness of each rubber and plastic heat-insulating plate is 2-4cm, so that the loss of cold energy is prevented.
As shown in fig. 3 and 4, in order to simulate different ground pressures, groundwater replenishment conditions and other working conditions on a construction site, a counterweight hydraulic cylinder 707 is added above a test bed to simulate the formation pressure.
For testing the ultrasonic-resistivity parameter similarity simulation of the development condition of the frozen wall, on the inner soil layer 702 of the simulation experiment box 700: freezing holes and ultrasonic detection holes are arranged in the vertical direction, as shown in fig. 1 and fig. 2, wherein the ultrasonic detection holes are uniformly arranged around the freezing holes, freezing pipes 711 are arranged in the freezing holes, and sound detection pipes 712 are arranged in the ultrasonic detection holes;
in the middle of the inner soil layer 702: temperature measuring points 713 are arranged among the freezing holes, among the ultrasonic detection holes and between the freezing holes and the ultrasonic detection holes;
on the impermeable layer 705: and a resistivity detection point 714 is arranged on the axis between the freezing holes, and a resistivity detection point 714 is arranged on the axis between the freezing holes and the ultrasonic detection hole.
Specifically, as shown in fig. 2: the freezing pipes are B2 and B3; the sound measuring tube is A1, A2, A3, A4, B1, B4, C1, C2, C3 and C4, wherein A1, A2, A3 and A4 are on the same straight line, B1, B2, B3 and B4 are on the same straight line, C1, C2, C3 and C4 are on the same straight line, and the straight line composed of A1, A2, A3 and A4, the straight line composed of B1, B2 and B3 and the straight line composed of B4C 1, C2, C3 and C4 are parallel to each other; meanwhile, A1, B1 and C1, A2, B2 and C2, A3, B3 and C3, A4, B4 and C4 are respectively on the same straight line and are perpendicular to the straight line consisting of A1, A2, A3 and A4, the straight line consisting of B1, B2 and B3 and the straight line consisting of B4C 1, C2, C3 and C4.
Temperature measurement points 703 and resistivity measurement points 704 are arranged among a straight line composed of A1, A2, A3 and A4, a straight line composed of B1, B2 and B3, B4C 1, C2, C3 and C4.
A temperature measuring point 703 is arranged on the axis of a straight line consisting of A1, B1 and C1, a straight line consisting of A2, B2 and C2, a straight line consisting of A3, B3 and C3, and a straight line consisting of A4, B4 and C4; a resistivity detection point 704 is provided on an axis between a straight line composed of a2, B2, and C2 and a straight line composed of A3, B3, and C3.
After the arrangement of the freezing tube, the sounding tube, the temperature measuring point and the resistivity measuring point in the simulation experiment box 700 is finished, the ultrasonic testing system 100, the resistivity testing system 200 and the temperature testing system are arranged.
The acquisition end of the ultrasonic testing system 100 is an ultrasonic acquisition instrument, an ultrasonic transducer is arranged in the acoustic pipe, and the signal output end of the ultrasonic transducer is in communication connection with the signal input end of the ultrasonic acquisition instrument;
the temperature measuring system comprises a temperature measuring system, a temperature measuring system and a temperature measuring system, wherein the testing end of the temperature testing system is a temperature measuring line, the temperature measuring line is arranged at a temperature measuring point, the acquisition end of the temperature testing system is a temperature acquisition system, and the data output end of the temperature measuring line is in communication connection with the input end of the temperature acquisition system;
the testing end of the resistivity testing system 200 is a resistivity testing line which is arranged at a resistivity detection point; the acquisition end of the resistivity test system 200 is a resistivity tester, the data output end of the resistivity test line is in communication connection with the input end of the resistivity tester through a cable, and electrodes of the resistivity test line are arranged one by one at intervals of 3-5 cm.
Ultrasonic detection holes are arranged in the simulation experiment box 700 every 0.2-0.5m, the ultrasonic transducers are 42mm in diameter and 20cm in length, freezing pipes are arranged in the ultrasonic detection holes, if the coupling effect is poor, the ultrasonic transducers can be directly buried in soil according to a measuring point arrangement mode after being coated with butter, and when the ultrasonic transducers are buried by 5cm, the ultrasonic transducers are compacted by soil once, so that the ultrasonic transducers are fully coupled with the soil, and air is not left.
The ultrasonic testing system comprises a receiving end and a transmitting end, and can realize single-transmitting and single-receiving and two-hole detection. Wherein B2 and B3 are freezing pipes, and whether the area within the zero temperature line of the freezing wall is coiled or not is mainly detected between B2 and B3 holes, so the detection is carried out once every 15 minutes within 0-12h in the early freezing period.
A1, A2; a2, A3; a3, A4; a4, B4; b4, C4; c3, C4; c2, C3; c1, C2; a1, B1; acoustic parameters of frozen soil in a constant temperature freezing mode mainly detecting different temperatures among ten groups of holes B1 and C1 comprise wave speed, wave shape, amplitude and the like. Pairs A3 and B3 with B2 and B3 as axes respectively; a4, B3; b4, B3; c4, B3; c3, B3; c2, B2; c1, B2; b1, B2; a1, B2; the detection is performed by A2 and B2, so that the zero-degree line position between holes can be detected, and a final zero-degree line graph can be drawn.
As shown in fig. 2, two resistivity survey lines, namely a3 and B3, are arranged in parallel inside a predicted zero-degree line in the soil box; a4, B3; b4, B3; c4, B3; c3, B3; c2, B2; c1, B2; b1, B2; a1, B2; drawing the final zero-degree line graph by A2 and B2;
in the middle of the inner soil layer 702: a resistivity detection point and a temperature detection point are arranged on an axis between a straight line formed by A2, B2 and C2 and a straight line formed by A3, B3 and C3, and a straight line formed by A1, A2, A3 and A4, a straight line formed by B1, B2, B3 and B4 and a straight line formed by C1, C2, C3 and C4; on the impermeable layer 705: a resistivity detection point is arranged on an axis between a straight line formed by A1, A2, A3 and A4, a straight line formed by B1, B2, B3 and B4 and a straight line formed by C1, C2, C3 and C4, namely a detection line is arranged on the axis between the two freezing holes;
in the middle of the inner soil layer 702: a temperature measuring point 703 is arranged on the axis of a straight line consisting of A1, B1 and C1, a straight line consisting of A2, B2 and C2, a straight line consisting of A3, B3 and C3, and a straight line consisting of A4, B4 and C4; on the impermeable layer 705: a resistivity detection point 714 is provided on an axis between a straight line composed of a2, B2, and C2 and a straight line composed of A3, B3, and C3.
A temperature measuring line is arranged at the temperature measuring point 703, and the data output end of the temperature measuring line is in communication connection with the input end of the temperature acquisition system; the data output end of the resistivity test line arranged at the resistivity detection point 714 is in communication connection with the input end of the resistivity tester through a cable, ultrasonic transducers are arranged in the sound-measuring tubes A1, A2, A3, A4, B1, B4, C1, C2, C3 and C4, and the signal output ends of the ultrasonic transducers are in communication connection with the signal input end of the ultrasonic acquisition instrument.
And arranging electrodes every 5cm along the detection line, connecting each electrode with the collecting head, and transmitting data through a cable. The change of the resistivity cloud of each section was detected every 2 hours, and the longitudinal section of the frozen region was determined. As shown in fig. 5 to 8, the longitudinal sectional views of the frozen regions at unfrozen, frozen 4h, 8h and 12h, respectively, are given.
A plurality of steel bars need to be welded around the upper part of the test bed, so that the cementation between the concrete and the test bed is increased; the freezing pipe, the sounding pipe and the resistance measuring line at different positions can be arranged according to different working conditions each time. The pipe diameters need to be modified according to a similar ratio. And after arrangement, filling and compacting at intervals of 5cm, arranging a waterproof layer above the concrete, pouring concrete, and carrying out a water head test, wherein the experiment can be carried out after no water leakage occurs.
After the test, chiseling off the concrete, gradually uncovering the frozen soil layer within 24 hours, and comparing the freezing range of the measured frozen soil with the frozen soil range determined by a resistance method, an ultrasonic method and a temperature measuring method.
In the embodiment, a sand layer in Guangzhou cloud large area is selected as a background to carry out freezing similarity simulation on the ultrasonic-resistivity parameter of the development condition of the frozen wall on a construction site. The geometric similarity ratio is 1:5, the density similarity ratio is 1: 1.2, the wave velocity similarity ratio is 1.09: 1.
freezing for 12h, detecting the frozen holes by ultrasonic wave every 15 minutes for 0-2h, detecting every 1 hour for 2-6h, and detecting every 2 hours for 6-12 h. And (4) detecting the resistivity cloud chart change of each section every 2 hours, and judging the longitudinal section of the freezing area. As shown in fig. 5 to 8, the longitudinal sectional views of the frozen regions at unfrozen, frozen 4h, 8h and 12h, respectively, are given.
As shown in the figures 5-8 and 9, the purple and red areas of the contour of the freezing area in the depth direction can be detected by the resistivity, the ring-crossing time between the freezing holes can be accurately predicted to be 1.7h and the frozen wall forming time can be accurately predicted to be 6h by the ultrasonic wave between the freezing holes, and the development condition of the frozen wall can be effectively predicted by combining the two methods.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the development condition of the frozen wall is characterized by comprising an ultrasonic testing system (100), a resistivity testing system (200), a temperature testing system, a saline water supply system (400), a clear water supply system (500), a refrigerating system (600), a simulation experiment box (700) and a soil layer water replenishing system;
an inner soil layer (702) is laid in the simulation experiment box (700) according to the requirements of the simulation soil layer, and soil layer water replenishing systems are arranged on two opposite sides of the inner soil layer (702);
the water outlet end of the brine tank (402) of the brine supply system (400) is in fluid communication with the water inlet end of a freezing pipe (711) in the simulation experiment box (700) through a brine pump (401), the water outlet end of the freezing pipe (711) is in fluid communication with the brine inlet ends of a refrigerator (602) and a condenser (601) of the refrigeration system (600) in sequence, and the brine outlet end of the condenser (601) of the refrigeration system (600) is in fluid communication with the water inlet end of the brine tank (402) of the brine supply system (400);
the water outlet end of a clean water tank (502) of the clean water supply system (500) is led out through a clean water pump (501) and a fluid at the water inlet (703) of a water supplementing channel of a soil layer water supplementing system on the inner side of the simulation experiment box (700), and a water outlet (704) of the water supplementing channel of the soil layer water supplementing system on the inner side of the simulation experiment box (700) is communicated with a fluid at the water inlet end of the clean water tank (502) of the clean water supply system (500); the water outlet end of the clear water tank (502) is in fluid communication with the clear water inlet end of the condenser (601) through a clear water pump (501), and the clear water outlet end of the condenser (601) is in fluid communication with the clear water inlet end of the clear water tank (502);
the ultrasonic testing system (100), the resistivity testing system (200) and the acquisition end of the temperature testing system are installed in the simulation experiment box (700), and the testing end of the ultrasonic testing system (100), the resistivity testing system (200) and the temperature testing system receives the data of the ultrasonic testing system (100), the resistivity testing system (200) and the acquisition end of the temperature testing system for testing.
2. The freezing similarity simulation test platform for ultrasonic resistivity parameters of the frost wall development conditions according to claim 1, characterized in that the soil layer water supplement system comprises a water filtration layer (701) and an iron sand net; the water filtering layer (701) is positioned on the inner side wall of the simulation experiment box (700) at the water inlet (703) and the water outlet (704) of the water supplementing channel, and the iron sand net is positioned between the inner soil layer (702) and the water filtering layer (701); the water filtering layer (701) is a sand-gravel layer with the thickness of 50-100 mm.
3. The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the frost wall development condition according to claim 2, characterized in that a water sealing pressurization system is arranged above the inner soil layer (702), the water sealing pressurization system comprises a waterproof layer (705), a concrete layer (706) and a hydraulic oil cylinder (707), the waterproof layer (705) is positioned above the inner soil layer (702), the concrete layer (706) is additionally laid above the waterproof layer (705) under the water replenishing condition, the hydraulic oil cylinder (707) is positioned above the concrete layer (706), and the power output end of the hydraulic oil cylinder (707) is positioned on the concrete layer (706); the joint of the concrete layer (706) and the side wall of the simulation experiment box (700) is coated with water-tight or polyurethane; the four outer wall surfaces of the simulation experiment box (700) and the upper part of the concrete layer (706) are wrapped by rubber and plastic heat-insulating plates, and the thickness of each rubber and plastic heat-insulating plate is 2-4 cm.
4. The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the developmental status of the frozen wall as claimed in claim 3, wherein the impermeable layer (705) is a clay layer, and the thickness of the impermeable layer (705) is 100-200 mm; the thickness of the concrete layer (706) is 50-200 mm; reinforcing steel bars are welded on the side wall of the simulation experiment box (700) above the concrete layer (706); the rebar increases connectivity between the concrete layer (706) and the simulation experiment box (700).
5. The freezing similarity simulation test platform for ultrasonic resistivity parameters of the frost wall development conditions of claim 4, characterized in that, on the inner soil layer (702) of the simulation test box (700): freezing holes and ultrasonic detection holes are formed in the vertical direction, the ultrasonic detection holes are uniformly arranged around the freezing holes, freezing pipes (711) are installed in the freezing holes, and sound detection pipes (712) are installed in the ultrasonic detection holes;
in the middle of the inner soil layer (702): temperature measuring points (713) are arranged among the freezing holes, among the ultrasonic detection holes and between the freezing holes and the ultrasonic detection holes;
on the impermeable layer (705): and a resistivity detection point (714) is arranged on the axis between the freezing holes, and a resistivity detection point (714) is arranged on the axis between the freezing holes and the ultrasonic detection hole.
6. The freezing simulation test platform for the ultrasonic resistivity parameter of the developmental status of frozen walls according to claim 5, wherein the testing end of the ultrasonic testing system (100) is an ultrasonic transducer, the collecting end of the ultrasonic testing system (100) is an ultrasonic collector, the ultrasonic transducer is installed in the acoustic pipe, and the signal output end of the ultrasonic transducer is in communication connection with the signal input end of the ultrasonic collector;
the temperature measuring system comprises a temperature measuring system, a temperature measuring system and a temperature measuring system, wherein the testing end of the temperature testing system is a temperature measuring line, the temperature measuring line is arranged at a temperature measuring point, the acquisition end of the temperature testing system is a temperature acquisition system, and the data output end of the temperature measuring line is in communication connection with the input end of the temperature acquisition system;
the testing end of the resistivity testing system (200) is a resistivity testing line which is arranged at a resistivity detection point; the acquisition end of the resistivity test system (200) is a resistivity tester, the data output end of the resistivity test line is in communication connection with the input end of the resistivity tester through a cable, and electrodes of the resistivity test line are arranged one by one at intervals of 3-5 cm.
7. The freeze simulation test platform for ultrasonic resistivity parameters of developmental conditions of frozen walls according to claim 5, wherein the freezing tubes are B2 and B3; the sound measuring tube is A1, A2, A3, A4, B1, B4, C1, C2, C3 and C4, wherein A1, A2, A3 and A4 are on the same straight line, B1, B2, B3 and B4 are on the same straight line, C1, C2, C3 and C4 are on the same straight line, and the straight line composed of A1, A2, A3 and A4, the straight line composed of B1, B2 and B3 and the straight line composed of B4C 1, C2, C3 and C4 are parallel to each other;
meanwhile, A1, B1 and C1, A2, B2 and C2, A3, B3 and C3, A4, B4 and C4 are respectively on the same straight line and are perpendicular to the straight line consisting of A1, A2, A3 and A4, the straight line consisting of B1, B2 and B3 and the straight line consisting of B4C 1, C2, C3 and C4.
8. The freezing similarity simulation test platform for ultrasonic resistivity parameters of the developmental status of frozen walls according to claim 7, characterized in that in the middle of the inner soil layer (702): a temperature measuring point (703) is arranged on an axis between a straight line composed of A1, A2, A3 and A4, a straight line composed of B1, B2, B3 and B4 and a straight line composed of C1, C2, C3 and C4; on the impermeable layer (705): and a resistivity detection point (714) is arranged on an axis between a straight line composed of A1, A2, A3 and A4, a straight line composed of B1, B2, B3 and B4 and a straight line composed of C1, C2, C3 and C4.
9. The freezing similarity simulation test platform for ultrasonic resistivity parameters of the developmental status of frozen walls according to claim 7, characterized in that in the middle of the inner soil layer (702): temperature measuring points (703) are arranged on the axes of a straight line consisting of A1, B1 and C1, a straight line consisting of A2, B2 and C2, a straight line consisting of A3, B3 and C3, and a straight line consisting of A4, B4 and C4; on the impermeable layer (705): and a resistivity detection point (714) is arranged on an axis between a straight line composed of A2, B2 and C2 and a straight line composed of A3, B3 and C3.
10. The freezing similarity simulation test platform for the ultrasonic resistivity parameter of the developmental status of the frozen wall according to any one of claims 8 and 9, wherein a temperature measuring line is arranged at a temperature measuring point (703), and a data output end of the temperature measuring line is in communication connection with an input end of the temperature acquisition system; the data output end of a resistivity test line arranged at the resistivity detection point (714) is in communication connection with the input end of the resistivity tester through a cable, ultrasonic transducers are arranged in the sound measurement tubes A1, A2, A3, A4, B1, B4, C1, C2, C3 and C4, and the signal output ends of the ultrasonic transducers are in communication connection with the signal input end of the ultrasonic acquisition instrument.
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