CN109868803B - Frost heaving stress detection device and detection method thereof - Google Patents
Frost heaving stress detection device and detection method thereof Download PDFInfo
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- CN109868803B CN109868803B CN201910240840.8A CN201910240840A CN109868803B CN 109868803 B CN109868803 B CN 109868803B CN 201910240840 A CN201910240840 A CN 201910240840A CN 109868803 B CN109868803 B CN 109868803B
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Abstract
A frost heaving stress detection device and a detection method thereof are provided. In cold region engineering construction, due to the complex geological conditions of a construction site, the frost heaving stress of frozen soil is difficult to detect and low in efficiency, and can only be obtained by qualitative or indirect calculation, so that quantitative data of the frost heaving stress cannot be directly obtained. In the device, a sliding sleeve is sleeved outside a sleeve and is in sliding fit with the sleeve, an anchor disc is fixedly sleeved outside the sliding sleeve, a connecting rod sequentially penetrates through the sliding sleeve and the sleeve along the radial direction of the sliding sleeve, a long hole matched with the connecting rod to move up and down along the axial direction of the connecting rod is machined in the side wall of the sleeve, the lower end of the sleeve is fixedly connected to a chassis, an upper cover is arranged at the upper end of the sleeve, a pressure sensor is arranged in the sleeve and is arranged on the upper cover, the upper end of a motion rod is in contact with a measuring head of the pressure sensor, and the lower end. The invention is used for detecting frost heaving stress of frozen soil.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a frost heaving stress detection device and a detection method thereof.
Background
The frost heaving force is a force generated by migration of water into a soil body being frozen and occurrence of a phase change when the temperature is lowered to a temperature lower than the freezing temperature of the soil body during formation of frozen soil. When the temperature is continuously or continuously reduced, most of the liquid water in the soil body is converted into solid water, and the phase change gradually slows until the solid water disappears. In the process, liquid water in the soil body is solidified and filled into gaps of soil particles in the form of ice, and frost heaving of the soil body is caused when the volume expansion of the water phase change in the soil body is enough to cause relative displacement between the soil particles. Three conditions must be met simultaneously when the soil body generates frost heaving: frost heaving sensitive soil, initial moisture or water replenishment, freezing temperature, and freezing time. The soil body frost heaving can not be caused by any condition in the three conditions, and the soil body frost heaving can be inhibited if any condition is eliminated by taking measures.
The patent '200620083578.9 super deep surface soil frost heaving pressure special measuring tube' realizes the measurement of frost heaving stress in the construction of super deep surface soil vertical shaft freezing sinking, because pressure sensor and soil body contact, the device can only measure the frost heaving stress of the frozen soil in the small region range of the measuring point, the non-uniformity of soil body frost heaving can lead to great error. The patent '201811504181.6 horizontal freezing method frost heaving thaw collapse stress experiment simulation device', '201510434795.1 a bilateral frost heaving test device and test method for porous materials' and '201510074655.8 a frost heaving instrument' all relate to a simulation test device and test method for laboratory frost heaving stress detection, and are not suitable for monitoring frost heaving stress of soil bodies at different depths in a construction site.
However, the frost heaving stress of the on-site soil body greatly varies due to different freezing depths and geological conditions of various regions, so that an actual value of the frost heaving stress of the engineering construction region needs to be obtained. Therefore, a means for accurately, reliably and quickly acquiring the frost heaving stress of the soil body on site is needed. In a word, due to the complex geological conditions of a construction site, the frost heaving stress of the frozen soil is difficult to detect, the efficiency is low, and the accuracy is poor, so that the construction quality of infrastructure in a frozen soil area is seriously affected, and the problem is not solved well until now.
Disclosure of Invention
The invention aims to provide a frost heaving stress detection device and a frost heaving stress detection method, which are used for solving the problem that the construction quality control of infrastructure in a frozen soil area is difficult to ensure due to complex geological conditions of a construction site, high detection difficulty of frost heaving stress of frozen soil, low efficiency and poor accuracy.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a frost heaving stress detection device, it includes the chassis, the connecting rod, the motion pole, the anchor disc, the sliding sleeve, the sleeve, upper cover and pressure sensor, the sliding sleeve suit is outside the sleeve and the two sliding fit, the fixed suit of anchor disc is outside the sliding sleeve, the connecting rod passes sliding sleeve and sleeve along the radial direction of sliding sleeve in proper order, it has the slot hole to process on the telescopic lateral wall, the length direction and the telescopic axial direction syntropy of slot hole, the length direction reciprocating motion of slot hole is followed to the connecting rod, telescopic lower extreme fixed connection is on the chassis, telescopic upper end is provided with the upper cover, pressure sensor is in the sleeve and its setting is covered last, the upper end of motion pole contacts with pressure sensor's gauge head, the lower extreme setting of motion pole is.
As a preferable scheme: the upper end of the motion rod is contacted with the pressure sensor.
As a preferable scheme: the upper cover is provided with a line through hole matched with the pressure sensor along the thickness direction.
As a preferable scheme: the lower end of the sliding sleeve is in clearance fit with the chassis.
The method for detecting frost heaving stress by using the frost heaving stress detection device according to the first embodiment of the present invention includes determining the number of test points and the distribution positions of the test points in a test area according to the types of frost soil in the test area, determining the number of devices for installing the frost heaving stress detection devices and the positions of the frost heaving stress detection devices according to the distribution conditions of the test points, acquiring frost heaving stress data of a frost heaving layer where the test points are located by detecting the frost heaving stress detection devices, and summarizing the frost heaving stress comprehensive conditions in the test area according to the frost heaving stress data fed back by the test points.
As a preferable scheme: the process of determining the number of the test points in the test area and the distribution position of each test point according to the frozen soil type of the test area is as follows:
respectively determining the number n of frost heaving sensitive frozen soil areas and the number m of frost heaving non-sensitive frozen soil areas according to a geological survey report, and respectively determining the number of measuring points in each frost heaving sensitive frozen soil area and each frost heaving non-sensitive frozen soil area;
area A of frost heaving sensitive frozen soil area1The ground surface of the frost heaving sensitive frozen soil area is divided into a plurality of first square grids, and the area of each first square grid is S1The number N of the measuring points in the frost heaving sensitive frozen soil area1＝A1/S1Similarly, the number of the measuring points in other frost heaving sensitive frozen soil areas is determined to be N one by one2、N3…NnThe intersection point of two diagonal lines in each first square grid is a measuring point position;
area B of frost heaving insensitive frozen soil area1Dividing a plurality of second square grids on the ground surface of the frost heaving insensitive frozen soil area, wherein each second square gridThe area of the grid is S2The number M of the measuring points is arranged in the frost heaving non-sensitive frost soil area1＝B1/S2Similarly, determining the number of the measuring points in other frost heaving non-sensitive frozen soil areas as M one by one2、M3…MmAnd the intersection point of two diagonal lines in each second square grid is a measuring point position.
As a preferable scheme: s1Has a value range of 0.25 to 1m2；S2Has a value range of 9 to 16m2。
As a preferable scheme: the detection process of each frost heaving stress detection device comprises the following three steps:
the method comprises the following steps: looking up geological data, obtaining the depth of an unfrozen layer of soil in a test area, excavating a hole, installing a frost heaving stress detection device in the hole, backfilling sandy soil outside the frost heaving stress detection device in a layered mode, and tamping in a layered mode;
step two: recording test time, wherein in the process of soil body frost heaving, the anchor plate moves upwards along with the frost heaving upward movement of the soil body between the chassis and the anchor plate, the sliding sleeve is driven to move synchronously upwards, the sliding sleeve moves to drive the connecting rod to move upwards, the connecting rod moves to push the moving rod to move towards the pressure sensor until the pressure sensor is pressed tightly, the pressure sensor receives a pressure signal and transmits the pressure signal to a recording instrument connected with the pressure sensor, and the pressure signal is collected, recorded and stored according to a preset channel;
step three: and acquiring the change rule of the pressure value recorded by the pressure sensor along with time from the recording instrument, namely acquiring frost heaving stress data of the frozen soil at the measuring points, and summarizing and counting the frost heaving stress data of the plurality of measuring points to acquire the comprehensive condition of the frost heaving stress in the test area.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, quantitative detection of frost heaving stress of frozen soil is realized by mutual matching of the chassis, the connecting rod, the moving rod, the anchor disc, the sliding sleeve, the upper cover and the pressure sensor, the acquisition mode is simple and direct, the calculation process is effectively omitted, and the data of frost heaving stress is acquired more accurately. Is beneficial to the comprehensive evaluation of frost heaving and thaw collapse of the soil body.
2. The detection method has the characteristics of multiple sampling points, large range of a test area, high efficiency, simple operation steps, low operation difficulty, time and labor saving, can be used for the whole frost heaving layer or the local frost heaving layer of the soil body, and has reliable detection results.
3. The invention can realize horizontal detection and vertical detection in soil body, and the installation position and direction are not limited.
4. The invention is not only suitable for laboratory detection, but also suitable for field detection.
Drawings
FIG. 1 is a schematic cross-sectional view of a front view structure of the present invention;
FIG. 2 is a schematic diagram of the working state of the invention in a laboratory simulated soil test;
FIG. 3 is a schematic view of the working condition of the present invention during the inspection at the construction site;
in the figure, 1-chassis; 2-a connecting rod; 3-a motion bar; 4-anchor disc; 5, sliding sleeve; 6-a sleeve; 7-covering; 8-a pressure sensor; 9-long hole; 10-line via; 11-holes; 14-frost heaving layer; 15-container.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
The first embodiment is as follows: the present embodiment is described with reference to fig. 1, 2 and 3, and includes a chassis 1, a connecting rod 2, a moving rod 3, anchor disc 4, sliding sleeve 5, sleeve 6, upper cover 7 and pressure sensor 8, 5 suits of sliding sleeve are outside sleeve 6 and the two sliding fit, 4 fixed suit of anchor disc are outside sliding sleeve 5, sliding sleeve 5 and sleeve 6 are passed in proper order to connecting rod 2 along the radial direction of sliding sleeve 5, processing has the slot hole 9 of cooperation connecting rod 2 along its axial direction up-and-down motion on the lateral wall of sleeve 6, the lower extreme fixed connection of sleeve 6 is on chassis 1, the upper end fixedly connected with upper cover 7 of sleeve 6, pressure sensor 8 is in sleeve 6 and its setting is on upper cover 7, the upper end of motion pole 3 is towards pressure sensor 8's gauge head setting, the two does not have relative extrusion motion this moment, the two is in the tight state of non-pressure, the lower extreme setting of motion pole 3 is on connecting rod 2. The connecting rod 2 and the moving rod 3 are both rod bodies made of the existing light-weight high-strength materials, and the accuracy of the detection data acquired by the device can be effectively improved.
Further, the upper cover 7 is formed with a wiring passage hole 10 in its thickness direction for fitting the pressure sensor 8.
Further, the pressure sensor 8 is an existing product, and the working process of the existing pressure sensor is the same as that of the existing pressure sensor.
Further, the lower end of the sliding sleeve 5 is in clearance fit with the chassis 1, and the sliding sleeve 5 and the chassis 1 are not directly connected, so that the sliding sleeve 5 can smoothly move upwards when frozen soil between the chassis 1 and the anchor plate 4 is frozen.
Furthermore, the connecting rod 2 penetrates through the sliding sleeve 5 along the radial direction of the sliding sleeve 5, a mounting hole is formed in the sliding sleeve 5, and the mounting hole is in interference fit with the connecting rod 2, so that the connecting rod 2 and the sliding sleeve 5 can move synchronously, and the detection accuracy of the invention can be ensured. The detection accuracy of the present invention is affected by the detection accuracy of the pressure sensor 8.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1, 2, and 3, and includes the following:
the method comprises the steps of determining the number of measuring points in a test area and the distribution position of each measuring point according to the type of frozen soil in the test area, determining the number of frost heaving stress detection devices and the position of each frost heaving stress detection device according to the distribution condition of each measuring point, acquiring frost heaving stress data of a frost heaving layer where each measuring point is located through the frost heaving stress detection devices, and summarizing according to the frost heaving stress data fed back by each measuring point to obtain the comprehensive condition of the frost heaving stress in the test area.
Dividing a test area according to a geological survey report, wherein the division principle is that the test area is divided according to frost heaving sensitive and frost heaving insensitive properties, the division of frost heaving sensitive and frost heaving insensitive is based on data from the geological survey report, the division principle is the prior art, the number of frost heaving sensitive frozen soil areas and frost heaving insensitive frozen soil areas is counted respectively after the test area is divided, the number of measuring points is determined in each frost heaving sensitive frozen soil area, and the number of measuring points is determined in each frost heaving insensitive frozen soil area, and the determination process is as follows:
when the number of the frost heaving sensitive frost soil areas is n, the area A of one frost heaving sensitive frost soil area1The ground surface of the frost heaving sensitive frozen soil area is divided into a plurality of first square grids, and the area of each first square grid is S1The number N of the measuring points in the frost heaving sensitive frozen soil area1＝A1/S1Similarly, the number of the measuring points in other frost heaving sensitive frozen soil areas is determined to be N one by one2、N3...Nn；S1Has a value range of 0.25 to 1m2I.e. the distance G between every two adjacent measuring points in the frost heave sensitive frozen soil area1The square grid is 50-100 cm, and the shape of the first square grid is square for convenience of calculation; the intersection point of two diagonal lines in each first square grid is a measuring point position;
in the step, the distance G between every two adjacent measuring points in the longitudinal or transverse frost heaving sensitive frozen soil area can be determined according to the outer diameter of the anchor plate 4, the minimum distance between every two adjacent measuring points which is larger than the non-interference between the two anchor plates 4 and the engineering requirements1And then, dividing the grid according to the space to obtain a first square grid with the area S1Finally determining the number N of the measuring points1＝A1/S1；
S1The value range is determined according to the distance G between every two adjacent measuring points in the longitudinal or transverse frost heaving sensitive frozen soil area1Calculating to obtain that the shape of the first cell is square for convenient calculation; the intersection point of two diagonal lines in each first cell is a measuring point position, and every two adjacent diagonal lines are adjacentDistance G between measuring points1Is the distance between the centers of circles of the two anchor disks 4, the distance G1The value range of (A) is determined according to the outer diameter of the anchor disks 4 and the requirement of the minimum distance between two anchor disks 4 which is not interfered with each other, and the distance G1The value range of (1) is 50-100 cm, and the distance G between every two adjacent measuring points1After the determination, the area of the first cell in which the measuring point is positioned can be obtained because the measuring point is positioned at the central position of the first cell, S1Has a value range of 0.25 to 1m2And then, actual grid dividing operation is carried out, and the final determined position of the measuring point can be ensured to be more accurate through a grid dividing mode.
When the number of the frost heaving insensitive frozen soil areas is m, the area B of one frost heaving insensitive frozen soil area1Dividing a plurality of second square grids on the ground surface of the frost heaving insensitive frozen soil area, wherein the area of each second square grid is S2The number M of the measuring points is arranged in the frost heaving non-sensitive frost soil area1＝B1/S2Similarly, determining the number of the measuring points in other frost heaving non-sensitive frozen soil areas as M one by one2、M3...Mm；S2Has a value range of 4 to 16m2I.e. the distance G between every two adjacent measuring points in the frost heaving non-sensitive frost soil area2The second square grid is 200-400 cm, and the shape of the second square grid is square for convenience of calculation; the intersection point of two diagonal lines in each second square grid is a measuring point position;
in the step, the distance G between every two adjacent measuring points in the longitudinal or transverse frost heaving sensitive frozen soil area can be determined according to the outer diameter of the anchor plate 4, the minimum distance between every two adjacent measuring points which is larger than the non-interference between the two anchor plates 4 and the engineering requirements2Then, the grid is drawn according to the space, and finally the number M of the measuring points is determined1＝B1/S2；
S2The value range is determined according to the distance G between every two adjacent measuring points in the longitudinal or transverse direction in the frost heaving insensitive frozen soil area2Calculating to obtain that the shape of the second cell is square for convenient calculation; the intersection point of two diagonal lines in each second cell is a measuring point position, and the distance between every two adjacent measuring pointsDistance G2Is the distance between the centers of circles of the two anchor disks 4, the distance G2The value range is determined according to the outer diameter of the anchor disks 4, the minimum distance between two anchor disks 4 which are not interfered with each other and the engineering requirements, and the distance G2The value range of (1) is 200-400 cm, and the distance G between every two adjacent measuring points2After the determination, the area of the second cell in which the measuring point is located can be obtained because the measuring point is located at the center of the second cell in which the measuring point is located, and S in the step2Has a value range of 4 to 16m2And then, actual grid dividing operation is carried out, and the final determined position of the measuring point can be ensured to be more accurate through a grid dividing mode.
N1、N2、N3...NnAnd M1、M2、M3...MmThe total of the test points is the total number of the test points in the test area, and the frost heaving stress detection devices with the corresponding number are prepared.
The third concrete implementation mode: the invention is characterized in that the frost heaving sensitive frozen soil area is a concentrated area of measuring points in the testing area, and frost heaving stress detection devices with corresponding numbers are selected according to the number of the measuring points in the frost heaving sensitive frozen soil area.
The frost heaving property of the soil body is divided into non-frost heaving, weak frost heaving, strong frost heaving and extra-strong frost heaving according to the frost heaving rate of 0-1%, 1-3.5%, 3.5-6%, 6-10% and more than 10%. Frost heaving, strong frost heaving and extra strong frost heaving belong to frost heaving sensitive frozen soil, while non-frost heaving and weak frost heaving belong to frost heaving non-sensitive frozen soil.
The fourth concrete implementation mode: the present embodiment is further limited to the first, second or third embodiment, and the detection process of each frost heaving stress detection apparatus includes the following three steps:
the method comprises the following steps: looking up geological data to obtain the depth of an unfrozen layer of soil in a test area, excavating a hole 11, installing a frost heaving stress detection device in the hole 11, backfilling sandy soil outside the frost heaving stress detection device in a layered mode, and tamping in a layered mode;
step two: recording the primary test time, wherein in the process of soil body frost heaving, the anchor plate 4 moves upwards along with the frost heaving upwards movement of the soil body between the chassis 1 and the anchor plate 4, the sliding sleeve 5 is driven to move upwards synchronously, the sliding sleeve 5 moves to drive the connecting rod 2 to move upwards, the connecting rod 2 moves to push the moving rod 3 to move towards the pressure sensor 8 to press the pressure sensor 8, and the pressure sensor 8 receives a pressure signal and transmits the pressure signal to a recording instrument connected with the pressure sensor 8 to collect, record and store the pressure signal according to a preset channel;
step three: and acquiring the pressure value recorded by the pressure sensor 8 from the recording instrument after a preset detection time interval so as to acquire the frozen soil stress data at the measuring point, and summarizing and counting the frozen soil stress data of the plurality of measuring points to acquire the comprehensive condition of the frost heaving stress in the test area.
Above-mentioned in-process record appearance is the current instrument that cooperates pressure sensor 4 to carry out the storage record with the power value, and the working process of mutually supporting is prior art.
In the process, frost heaving stress data of the frost heaving layer 14 recorded by each measuring point in the test area are collected, a three-dimensional image and a change trend along with time are drawn by the plane position of each measuring point and the frost heaving stress data of each measuring point, when the frost heaving stress of one local area in the test area is too large, the water content of soil in the local area is higher, the influence of frost heaving can be reduced by adopting corresponding technical measures subsequently, and the frost heaving condition of the frost heaving layer 14 in the test area can be comprehensively evaluated through analysis of the maximum value, the minimum value and the average value of the frost heaving amount.
Furthermore, the diameter of the hole 11 in the above steps is 15-25 cm, the optimal value of the diameter is 20cm, and the diameter has universality.
The fifth concrete implementation mode: the present embodiment is further limited to the first, second, third or fourth embodiments, and the detection period of the present invention is a whole winter period, and the specific time is from the end of autumn when the average temperature of the first year is close to 0 ℃ to the beginning of spring when the average temperature of the second year rises to 0 ℃ or more.
The sixth specific implementation mode: in this embodiment, after the first square grids are divided in the test area, the positions of the test points can be selected as the intersection points of the horizontal lines and the vertical lines of the first square grids, so that the calculation of the frost heaving amount is more convenient, and the process of determining the test points on the second square grids is the same as the process of determining the test points on the second square grids.
The seventh embodiment: in this embodiment, as a further limitation of the first, second, third, fourth, fifth or sixth embodiment, the frost heaving stress detection device is disposed in the container 15, and the container 15 is filled with a soil mass, and a test detection of a small-scale simulated soil mass is performed.
The following examples are described in conjunction with the beneficial effects of the present invention:
the first embodiment is as follows:
the method comprises the steps that a test area is a shoulder of a N area in H city of northeast, a geological survey report is obtained to know that the depth of an unfrozen layer of soil in the test area is 2100mm, the number N of frost heaving sensitive frost soil areas and the number of frost heaving non-sensitive frost soil areas in the test area are divided into m according to the size of the test area, the moisture at different positions of the test area and the difference of frost heaving depths, and finally the number of the frost heaving stress detection devices is determined.
The specific operation process of installing and detecting the frost heaving stress detection device is as follows:
the method comprises the following steps: looking up geological data to obtain the depth of an unfrozen layer of soil in a test area, in 2018, 11 months and 20 days, excavating a hole 11, installing a frost heaving stress detection device in the hole 11, enabling the distance between an anchor disc 4 and a chassis 1 to be 50cm, backfilling sandy soil outside the frost heaving stress detection device in a layered mode, tamping in a layered mode, enabling the upper end of a motion rod 3 to face a measuring head of a pressure sensor 8 to be in contact with the measuring head of the pressure sensor, enabling the upper end of the motion rod and the measuring head to have no relative extrusion motion, and enabling the initial value of;
step two: in 12 months and 20 days in the same year, in the soil body frost heaving process, along with the frost heaving upward movement of the soil body between the chassis 1 and the anchor plate 4, the anchor plate 4 moves upward to drive the sliding sleeve 5 to synchronously move upward, the sliding sleeve 5 moves to drive the connecting rod 2 to move upward, the connecting rod 2 moves to push the moving rod 3 to move toward the pressure sensor 8 until the pressure sensor 8 is pressed tightly, the pressure sensor 8 displays 19.8KPa, a pressure signal is transmitted to a recording instrument connected with the pressure sensor, and the pressure signal is collected, recorded and stored according to a preset channel;
step three: and (4) acquiring the pressure value recorded by the pressure sensor 8 from the recording instrument in 20 days 1 month in the next year, wherein the pressure sensor 8 displays 24.8KPa, so that the frost heaving stress of the frozen soil in the measuring point area is 24.8KPa, and summarizing and counting the frozen soil stress data of a plurality of measuring points to obtain the comprehensive condition of the frost heaving stress in the measuring area.
And summarizing the plane position of each measuring point and frost heaving stress data thereof to draw a three-dimensional image, and marking the change trend along with time so as to quantitatively evaluate the frost heaving stress degree of the test area and give guidance suggestions. When the frost heaving stress of one local area in the test area is overlarge, the moisture content of the soil body of the local area is indicated to be higher, corresponding technical measures can be subsequently adopted to reduce the influence of frost heaving, and the frost heaving condition of the frost heaving layer 14 in the test area can be comprehensively evaluated through analysis of the maximum value, the minimum value and the average value of the frost heaving amount and the change rule along with time.
Claims (7)
1. The utility model provides a frost heaving stress detection device which characterized in that: it includes the chassis, the connecting rod, the motion pole, the anchor plate, the sliding sleeve, the sleeve, upper cover and pressure sensor, the sliding sleeve suit is outside the sleeve and the two sliding fit, the fixed suit of anchor plate is outside the sliding sleeve, the connecting rod passes sliding sleeve and sleeve along the radial direction of sliding sleeve in proper order, it has the slot hole to process on the telescopic lateral wall, the length direction and the telescopic axial direction syntropy of slot hole, the connecting rod is along the length direction reciprocating motion of slot hole, telescopic lower extreme fixed connection is on the chassis, telescopic upper end is provided with the upper cover, pressure sensor is in the sleeve and its setting is on the upper cover, the upper end of motion pole contacts with pressure sensor's gauge head, the lower extreme setting of motion pole is on the connecting.
2. The frost heave stress detection apparatus of claim 1, wherein: the upper cover is provided with a line through hole matched with the pressure sensor along the thickness direction.
3. The frost heave stress detection apparatus of claim 1 or 2, wherein: the lower end of the sliding sleeve is in clearance fit with the chassis.
4. A detection method implemented by using the frost heaving stress detection apparatus according to claim 1, wherein: the method comprises the steps of determining the number of measuring points in a test area and the distribution position of each measuring point according to the type of frozen soil in the test area, determining the number of frost heaving stress detection devices and the position of each frost heaving stress detection device according to the distribution condition of each measuring point, acquiring frost heaving stress data of a frost heaving layer where each measuring point is located through the frost heaving stress detection devices, and summarizing according to the frost heaving stress data fed back by each measuring point to obtain the comprehensive condition of the frost heaving stress in the test area.
5. The detection method according to claim 4, characterized in that: the process of determining the number of the test points in the test area and the distribution position of each test point according to the frozen soil type of the test area is as follows:
respectively determining the number n of frost heaving sensitive frozen soil areas and the number m of frost heaving non-sensitive frozen soil areas according to a geological survey report, and respectively determining the number of measuring points in each frost heaving sensitive frozen soil area and each frost heaving non-sensitive frozen soil area;
area A of frost heaving sensitive frozen soil area1The ground surface of the frost heaving sensitive frozen soil area is divided into a plurality of first square grids, and the area of each first square grid is S1The number N of the measuring points in the frost heaving sensitive frozen soil area1＝A1/S1Similarly, the number of the measuring points in other frost heaving sensitive frozen soil areas is determined to be N one by one2、N3…NnThe intersection point of two diagonal lines in each first square grid isA measurement point location;
area B of frost heaving insensitive frozen soil area1Dividing a plurality of second square grids on the ground surface of the frost heaving insensitive frozen soil area, wherein the area of each second square grid is S2The number M of the measuring points is arranged in the frost heaving non-sensitive frost soil area1＝B1/S2Similarly, determining the number of the measuring points in other frost heaving non-sensitive frozen soil areas as M one by one2、M3…MmAnd the intersection point of two diagonal lines in each second square grid is a measuring point position.
6. The detection method according to claim 5, characterized in that: s1Has a value range of 0.25 to 1m2；S2Has a value range of 9 to 16m2。
7. The detection method according to claim 4, 5 or 6, characterized in that: the detection process of each frost heaving stress detection device comprises the following three steps:
the method comprises the following steps: looking up geological data, obtaining the depth of an unfrozen layer of soil in a test area, excavating a hole, installing a frost heaving stress detection device in the hole, backfilling sandy soil outside the frost heaving stress detection device in a layered mode, and tamping in a layered mode;
step two: recording test time, wherein in the process of soil body frost heaving, the anchor plate moves upwards along with the frost heaving upward movement of the soil body between the chassis and the anchor plate, the sliding sleeve is driven to move synchronously upwards, the sliding sleeve moves to drive the connecting rod to move upwards, the connecting rod moves to push the moving rod to move towards the pressure sensor until the pressure sensor is pressed tightly, the pressure sensor receives a pressure signal and transmits the pressure signal to a recording instrument connected with the pressure sensor, and the pressure signal is collected, recorded and stored according to a preset channel;
step three: and acquiring the change rule of the pressure value recorded by the pressure sensor along with time from the recording instrument, namely acquiring frost heaving stress data of the frozen soil at the measuring points, and summarizing and counting the frost heaving stress data of the plurality of measuring points to acquire the comprehensive condition of the frost heaving stress in the test area.
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| CN111487155B (en) * | 2020-04-08 | 2021-06-08 | 河海大学 | Method for testing frost heaving stress resolution effect of asphalt mixture communicated pores |
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