CN108844823B - Device and method for measuring side friction resistance of soil layer at any depth - Google Patents
Device and method for measuring side friction resistance of soil layer at any depth Download PDFInfo
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Abstract
The invention provides a device for measuring the side friction resistance of a soil layer with any depth, which comprises: the shell is used for bearing the pressure applied to the soil body, one end of the shell is in sliding sealing connection with the confining pressure bearing plate, and the other end of the shell is provided with a hole in sliding sealing connection with the dowel bar; the confining pressure bearing plate is used for transmitting the loaded load to the soil body, the outer wall of the confining pressure bearing plate is in sliding sealing connection with the inner wall of the shell, and a hole in sliding sealing connection with the dowel bar is formed in the confining pressure bearing plate; and the dowel bar is used for applying load along the axial direction to obtain soil layer side friction resistance, one end of the dowel bar is in sliding sealing connection with the confining pressure bearing plate, and the other end of the dowel bar is in sliding sealing connection with the hole on the end face of the shell. When the pressure-limiting device is used, the pressure is loaded on the confining pressure bearing plate to simulate the soil layer pressure with different depths, then the pressure is loaded on the dowel bar, and the pressure when the dowel bar starts to move is the maximum pressure which can be born under the action of side friction resistance. The soil layer side friction resistance values with different depths can be obtained more accurately.
Description
Technical Field
The invention relates to the field of foundation soil layer property determination, in particular to a device and a method for measuring side friction resistance of a soil layer with any depth.
Background
The soil layer side friction resistance, especially the determination of deep soil layer side friction resistance, is an important content of foundation design in geotechnical engineering technical standards, and is also a problem of relatively large academic disambiguation in soil mechanics. At present, the side friction resistance value is generally determined according to the regulation and is only an empirical formula, the true side friction resistance value of soil layers with different depths is difficult to determine, the determined side friction resistance value is always conservative, foundation performance cannot be fully exerted to a certain extent, structural design is conservative, and waste is indirectly caused. In the aspect of determining the side friction resistance, the values given by the specifications tend to be conservative, and the magnitude of the side friction resistance between the given structure and the soil mass is seldom considered, so that the side friction resistance is worth influencing by the structural material. Therefore, how to obtain more accurate soil layer side friction resistance values with different depths has great benefits in structural design and engineering construction.
Chinese patent document CN 105547841A describes a rock side friction resistance testing device with controllable confining pressure and a method thereof, and relates to rock mass mechanics rock-socketed pile technology. The device is: the lower cover plate, the pressure chamber and the upper cover plate are sequentially connected from bottom to top to form an external structure; the base, the backing ring, the rock sample and the guide pipe are sequentially connected from bottom to top to form an internal structure, and the internal components are nested into a whole by the latex film; a penetrating rock sample round hole is formed in the rock sample center along the longitudinal direction, a threaded rod with equal length is arranged in the rock sample round hole, a gap is reserved between the threaded rod and the inner wall of the rock sample round hole, and cement paste with high fluidity is poured in the gap; the guide rod passes through the guide tube and is connected with the threaded rod up and down. The device can simulate the destruction characteristic of the interface between the embedded rock pile and the rock, simulate the confining pressure condition of the pile in the actual rock stratum by utilizing the water pressure action in the pressure chamber, obtain the rule that the axial force changes along with the displacement of the model pile, calculate the side friction resistance of the rock, and have uniform standards, can realize multiple industrial replication, and is suitable for the side friction resistance test of various rocks. However, the device has the following problems in simulating confining pressure conditions by pressure liquid:
1. the difference from the actual side friction resistance condition is large.
2. The loading mode is complex.
3. Sealing of the pressurized liquid under high pressure conditions is difficult to achieve.
4. The volumetric size of the test specimen is limited by the loading device.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for measuring the soil layer side friction resistance at any depth, which can obtain soil layer side friction resistance values at different depth positions with good anastomosis with actual foundation conditions. In the preferred scheme, experiments which can be convenient verify the side friction resistance value of soil layers with different soil textures and different depth positions to the anchor pile.
In order to solve the technical problems, the invention adopts the following technical scheme: a device for measuring soil layer side friction resistance at any depth, comprising:
the shell is used for bearing the pressure applied to the soil body, one end of the shell is in sliding sealing connection with the confining pressure bearing plate, and the other end of the shell is provided with a hole in sliding sealing connection with the dowel bar;
the confining pressure bearing plate is used for transmitting the loaded load to the soil body, the outer wall of the confining pressure bearing plate is in sliding sealing connection with the inner wall of the shell, and a hole in sliding sealing connection with the dowel bar is formed in the confining pressure bearing plate;
and the dowel bar is used for applying load along the axial direction to obtain soil layer side friction resistance, one end of the dowel bar is in sliding sealing connection with the confining pressure bearing plate, and the other end of the dowel bar is in sliding sealing connection with the hole on the end face of the shell.
In the preferred scheme, a pressure detector is further arranged, wherein the first pressure detector is arranged on the confining pressure bearing plate, and the second pressure detector is arranged on the dowel bar.
In the preferred scheme, the shell is vertically arranged, the dowel bar penetrates through the shell and the confining pressure bearing plate, and soil is filled between the inner wall of the shell and the dowel bar;
the first loading device is loaded on the confining pressure bearing plate through the first pressure transmission plate and the first pressure detector;
the second loading device is loaded on the dowel bar through a second pressure transmitting plate and a second pressure detector.
In the preferred scheme, the bottom of the shell is provided with a support, and the dowel bar penetrates through the bottom of the shell and is axially limited by a limiting bolt.
In the preferred scheme, the shell is horizontally arranged, supported by the detection frame and axially limited;
the dowel bar passes through the shell and the confining pressure bearing plate, and soil is filled between the dowel bar and the inner wall of the shell;
the two ends of the detection frame are provided with end baffles, and a first loading cylinder, a pressure transmitting plate and a first pressure detector are arranged between the end baffles at one end and the confining pressure bearing plate;
a second loading cylinder and a second pressure detector are arranged between the end baffle plate at the other end and the confining pressure bearing plate.
In the preferred scheme, the soil body is a simulated soil body which is simulated in a layered manner according to the layered state of the actual soil layer.
In the preferred scheme, in the detection frame, at least one supporting seat is arranged on the bottom plate, and limit seats are arranged on the two sides of the supporting seat on the shell;
and loading cylinder supports for supporting the loading cylinders are arranged at the positions, close to the two ends, of the bottom plate.
In a preferred embodiment, a displacement sensor is arranged between the housing and the force transmission rod.
The measuring method for measuring the soil layer side friction resistance at any depth by adopting the device comprises the following steps:
s1, temporarily and fixedly connecting a dowel bar with a shell, injecting a soil body with side friction resistance to be measured into the shell, and flattening and compacting;
s2, placing the confining pressure bearing plate into a shell, installing a first pressure detector and a first pressure transmitting plate, calculating the pressure born by the soil layer with the depth according to the depth of the soil body to be monitored, loading the pressure onto the confining pressure bearing plate through the first pressure transmitting plate and the first pressure detector by adopting a first vertically downward loading device, wherein the first pressure detector is used for monitoring the loading pressure;
s3, temporarily fixing and loosening the dowel bar and the shell, installing a second pressure detector and a second pressure transmitting plate on the dowel bar, and loading gradually increased pressure on the dowel bar through the second pressure transmitting plate and the second pressure detector by a second loading device, wherein the pressure when the dowel bar starts to move is the maximum pressure born by the action of side friction resistance;
the soil layer side friction resistance of any depth is measured through the steps.
The measuring method for measuring the soil layer side friction resistance at any depth by adopting the device comprises the following steps:
s1, temporarily and fixedly connecting a dowel bar with a shell, layering and injecting soil body with side friction resistance to be measured into the shell, and flattening and compacting;
s2, temporarily fixing and removing the dowel bar and the shell, putting the confining pressure bearing plate into the shell, horizontally supporting and fixing the shell on the detection frame, installing a first pressure detector, a pressure transmitting plate and a first loading cylinder, calculating the pressure born by the deep soil layer according to the depth of the soil body to be monitored, loading the pressure on the confining pressure bearing plate through the pressure transmitting plate and the first pressure detector by the first loading cylinder, and monitoring the loading pressure by the first pressure detector;
s3, installing a second pressure detector, a pressure transmitting plate and a second loading cylinder on the dowel bar, loading pressure on the dowel bar through the pressure transmitting plate and the second pressure detector by the second loading cylinder, wherein the pressure when the dowel bar starts to move is the maximum pressure bearable under the action of side friction resistance;
the soil layer side friction resistance of any depth is measured through the steps.
The device and the method for measuring the soil layer side friction resistance at any depth have the following beneficial effects by adopting the scheme:
1. the side friction resistance values of soil layers with different depths can be obtained by the method, the side friction resistance values can be well matched with actual foundation conditions, and in the aspect of determining the side friction resistance, the influence of structural materials on the side friction resistance values can be included in the numerical change.
2. The invention can accurately obtain the side friction resistance values of soil layers with different depths, and has more accurate reference values for structural design and engineering construction.
3. The device has simple structure and convenient use.
4. In a preferred scheme, the device and the method can simulate the influence of soil layers with different depths and different components on the bearing capacity of the tubular pile very truly.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic structural view of the device of the present invention.
Fig. 2 is a schematic view of the preferred overall structure of the device of the present invention.
Fig. 3 is a schematic structural view of the temporary fixing device in the present invention.
In the figure: the device comprises a first pressure detector 1, a second pressure detector 1', a first pressure transmitting plate 2, a second pressure transmitting plate 3, a confining pressure bearing plate 4, a dowel bar 5, a soil body 6, a first shell 7, a support 8, a limit bolt 9, a detection frame 100, a bottom plate 1001, a supporting seat 1002, a loading cylinder support 1003, an end baffle 1004, a displacement sensor 101, a first loading cylinder 102, a second loading cylinder 103, a simulated confining pressure bearing plate 104, a second dowel bar 105, a simulated soil body 106, a second shell 107, a limit seat 108, a temporary positioning plate 109, a positioning hole 1091, a filling hole 1092 and a third pressure transmitting plate 110.
Detailed Description
Example 1:
as shown in fig. 1-2, a device for measuring soil layer side friction resistance at any depth comprises:
the shell is used for bearing the pressure applied to the soil body, one end of the shell is in sliding sealing connection with the confining pressure bearing plate, and the other end of the shell is provided with a hole in sliding sealing connection with the dowel bar;
the confining pressure bearing plate is used for transmitting the loaded load to the soil body, the outer wall of the confining pressure bearing plate is in sliding sealing connection with the inner wall of the shell, and a hole in sliding sealing connection with the dowel bar is formed in the confining pressure bearing plate; with the structure, the load applied to the confining pressure bearing plate can simulate the load applied to soil layers with different depths.
And the dowel bar is used for applying load along the axial direction to obtain soil layer side friction resistance, one end of the dowel bar is in sliding sealing connection with the confining pressure bearing plate, and the other end of the dowel bar is in sliding sealing connection with the hole on the end face of the shell.
In a preferred embodiment, as shown in fig. 1 and 2, a pressure detector is further provided, wherein a first pressure detector 1 is arranged on the confining pressure bearing plate, and a second pressure detector 1' is arranged on the dowel bar. The pressure detector in this example is a pressure sensor, for example a device comprising a pressure strain gauge, for detecting the pressure value of the load.
Example 2:
on the basis of the embodiment 1, as shown in fig. 1, a preferable scheme is that a first shell 7 is vertically arranged, a support 8 is arranged at the bottom of the first shell 7, an overhead cavity is arranged on the support 8, a dowel bar 5 axially penetrates through the first shell 7 and a confining pressure bearing plate 4, and soil bodies 6 are filled between the inner wall of the first shell 7 and the dowel bar 5; the dowel 5 passes through the bottom of the first housing 7 and is axially restrained by a restraining bolt 9.
The first loading device is loaded on the confining pressure bearing plate 4 through the first pressure transmission plate 2 and the first pressure detector 1; the first loading device is a press, not shown in the figures.
The second loading device is loaded on the dowel bar 5 through the second pressure transmitting plate 3 and the second pressure detector 1'. The second loading device is a press, not shown in the figures.
In a preferred embodiment, the first loading device is a ring-shaped hydraulic cylinder, the piston of which is ring-shaped, and the corresponding first pressure transmitting plate 2 and the first pressure detector 1 are also ring-shaped. The second loading device is positioned at the center of the first loading device, and the first loading device and the second loading device can respectively apply load.
Example 3:
based on the embodiments 1 and 2, a measuring method adopting the device for measuring the soil layer side friction resistance with any depth comprises the following steps:
s1, temporarily and fixedly connecting a dowel bar 5 with a first shell 7 by using a limit bolt 9, injecting a soil body with side friction resistance to be measured into the first shell 7, and flattening and compacting;
s2, placing the confining pressure bearing plate 4 into the first shell 7, installing the first pressure detector 1 and the first pressure transmitting plate 2, calculating the pressure born by the soil layer with the depth according to the depth of the soil body to be monitored, loading the pressure on the confining pressure bearing plate 4 through the first pressure transmitting plate 2 and the first pressure detector 1 by adopting a first vertically downward loading device, wherein the first pressure detector 1 is used for monitoring the loading pressure; the first loading device is used for simulating the pressure of soil layers with different depths.
s3, loosening a temporary fixing, namely a limit bolt 9, between the dowel bar 5 and the first shell 7, installing a second pressure detector 1' and a second pressure transmitting plate 3 at the top end of the dowel bar 5, loading gradually increased pressure onto the dowel bar 5 through the second pressure transmitting plate 3 and the second pressure detector 1' by a second loading device, wherein when the dowel bar 5 starts to move, the pressure detected by the second pressure detector 1' is the maximum pressure born by the action of side friction resistance; dividing the pressure by the contact area of the dowel bar and the soil body, namely the product of the perimeter of the section of the dowel bar and the length of the dowel bar, namely the maximum static friction between the dowel bar and the soil body; and (3) monitoring the pressure detected by a second pressure detector 1' between the dowel bar 5 and the second pressure transmitting plate 3 in the downward movement process of the dowel bar, wherein the pressure is divided by the contact area of the dowel bar and the soil body, namely the product of the perimeter of the section of the dowel bar and the length of the dowel bar, namely the magnitude of the side friction between the dowel bar and the soil body.
The soil layer side friction resistance of any depth is measured through the steps.
Example 4:
on the basis of the embodiment 1, the preferred scheme is as shown in fig. 2 and 3, the second shell 107 is horizontally arranged, supported by the detection frame 100 and axially limited;
in a preferred embodiment, in the detection rack 100, at least one supporting seat 1002 is provided on the bottom plate 1001, and limiting seats 108 are provided on two sides of the supporting seat 1002 on the housing; with this configuration, the axial displacement of the second housing 107 can be restricted.
A loading cylinder holder 1003 for supporting a loading cylinder is provided at a position of the base plate 1001 near both ends. End baffles 1004 are arranged at two ends of the detection frame 100, and reinforcing ribs are arranged on the limit seat 108, the supporting seat 1002 and the end baffles 1004 so as to improve bearing capacity.
The second dowel bar 105 passes through the second shell 107 and the simulated confining pressure bearing plate 104, and soil is filled between the second dowel bar 105 and the wall of the second shell 107; in a preferred embodiment, as shown in fig. 2, the soil body in this example is a simulated soil body 106 that is simulated hierarchically according to the actual soil layer layering state. For example, gravel, backfill concrete, sandy clay and clay are sequentially obtained at a certain depth in the foundation sampling process, and gravel, backfill concrete, sandy clay and clay are sequentially filled between the second dowel 105 and the wall of the second housing 107 according to the layering thickness, so as to simulate the real soil layer state.
A first loading cylinder 102, a third pressure transmitting plate 110 and a first pressure detector are arranged between the end baffle 1004 at one end and the simulated confining pressure bearing plate 104;
a second loading cylinder, a pressure transmitting plate 110 and a second pressure detector are arranged between the end baffle plate and the confining pressure bearing plate at the other end.
In a preferred embodiment, a displacement sensor 101 is arranged between the second housing 107 and the second force transmission rod 105. To monitor the displacement-activated condition of second dowel 105. The displacement sensor 101 in this example employs an optical sensor, the displacement sensor 101 is fixedly mounted on an end surface of the second housing 107, and a detection head of the displacement sensor 101 faces the second dowel 105.
Example 5:
on the basis of the embodiment 4, the measuring method for measuring the soil layer side friction resistance device with any depth comprises the following steps:
s1, the second dowel 105 is temporarily and fixedly connected with the second housing 107, in this example, a temporary positioning plate 109 is used to connect the second dowel 105 with the second housing 107, the temporary positioning plate 109 is a circular plate, a positioning hole 1091 is formed in the temporary positioning plate 109 and used for positioning the radial position of the second dowel 105, and a filling hole 1092 is formed around the positioning hole 1091 and used for filling the simulated soil body 106. Injecting soil mass with side friction resistance to be measured into the second shell 107 in a layered manner, and flattening and compacting;
s2, temporarily fixing and removing the second dowel bar 105 and the second housing 107, placing the analog confining pressure bearing plate 104 into the second housing 107, horizontally supporting and fixing the second housing 107 on the detection frame 100, and installing the first pressure detector 1, the third pressure transmitting plate 110 and the first loading cylinder 102, wherein in a preferred scheme, the third pressure transmitting plate 110 adopts a disc structure, the protruding edge of the third pressure transmitting plate 110 is in contact with the first pressure detector 1, and the bottom of the third pressure transmitting plate 110 is in contact with the piston rod of the first loading cylinder 102. To transfer the pressure applied by the first loading cylinder 102 to the simulated confining pressure bearing plate 104. Calculating the pressure born by the soil layer with the depth according to the depth of the soil body to be monitored, loading the pressure on the confining pressure bearing plate by the first loading cylinder 102 through the pressure transmission plate and the first pressure detector 1, wherein the first pressure detector 1 is used for monitoring the loading pressure until the loading pressure reaches a preset value; the support seat 1002 and the limit seat 108 are used to carry axial pressure.
s3, installing a second pressure detector 1', a pressure transmitting plate and a second loading cylinder 103 on the second dowel bar 105, loading pressure on the second dowel bar 105 through the pressure transmitting plate and the second pressure detector 1' by the second loading cylinder 103, wherein the pressure when the second dowel bar 105 starts to move is the maximum pressure born by the action of side friction resistance; dividing the pressure by the contact area of the second dowel bar 105 and the soil body, namely the product of the perimeter of the section of the second dowel bar 105 and the length of the second dowel bar 105, namely the maximum static side friction between the second dowel bar 105 and the soil body; and (3) monitoring the pressure detected by a second pressure detector 1' between the second dowel bar 105 and the pressure transmitting plate in the downward movement process of the second dowel bar 105, wherein the pressure is divided by the contact area of the second dowel bar 105 and the soil body, namely the product of the perimeter of the section of the second dowel bar 105 and the length of the second dowel bar 105, namely the magnitude of the side friction between the second dowel bar 105 and the soil body.
The soil layer side friction resistance of any depth is measured through the steps. The advantage in this case lies in the requirement to experimental facilities is lower, can conveniently acquire at the job site, is particularly suitable for the test experiment to long tubular pile. And the scheme of loading from both ends respectively, the axial pressure change of the simulated soil body 106 is also relatively similar to the soil body pressure-bearing condition of the actual construction site. The side friction resistance of the soil layer with any depth can be simulated more truly.
The foregoing embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without collision. The protection scope of the present invention is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (8)
1. The device for measuring the side friction resistance of the soil layer with any depth is characterized by comprising the following components:
the shell is used for bearing the pressure applied to the soil body, one end of the shell is in sliding sealing connection with the confining pressure bearing plate, and the other end of the shell is provided with a hole in sliding sealing connection with the dowel bar;
the confining pressure bearing plate is used for transmitting the loaded load to the soil body, the outer wall of the confining pressure bearing plate is in sliding sealing connection with the inner wall of the shell, and a hole in sliding sealing connection with the dowel bar is formed in the confining pressure bearing plate;
the dowel bar is used for applying load along the axial direction to obtain soil layer side friction resistance, one end of the dowel bar is in sliding sealing connection with the confining pressure bearing plate, and the other end of the dowel bar is in sliding sealing connection with a hole on the end face of the shell;
the pressure detector is also provided with a pressure detector, wherein the first pressure detector (1) is arranged on the confining pressure bearing plate, and the second pressure detector (1') is arranged on the dowel bar;
the shell is vertically arranged, the dowel bar (5) penetrates through the shell and the confining pressure bearing plate, and soil is filled between the inner wall of the shell and the dowel bar (5);
the first loading device is loaded on the confining pressure bearing plate (4) through the first pressure transmission plate (2) and the first pressure detector (1);
the second loading device is loaded on the dowel bar (5) through the second pressure transmitting plate (3) and the second pressure detector (1').
2. The device for measuring soil layer side friction resistance at any depth according to claim 1, wherein: the bottom of the shell is provided with a support (8), and the dowel bar (5) penetrates through the bottom of the shell and is axially limited by a limiting bolt (9).
3. A measuring method using the device for measuring soil layer side friction resistance of any depth according to any one of claims 1 to 2, characterized by comprising the steps of:
s1, temporarily and fixedly connecting a dowel bar with a shell, injecting a soil body with side friction resistance to be measured into the shell, and flattening and compacting;
s2, placing the confining pressure bearing plate into a shell, installing a first pressure detector (1) and a first pressure transmitting plate (2), calculating the pressure born by a soil layer with the depth according to the depth of the soil body to be monitored, loading the pressure onto the confining pressure bearing plate through the first pressure transmitting plate (2) and the first pressure detector (1) by adopting a first vertically downward loading device, wherein the first pressure detector (1) is used for monitoring the loading pressure;
s3, temporarily fixing and loosening the dowel bar and the shell, installing a second pressure detector (1 ') and a second pressure transmitting plate (3) on the dowel bar, and loading gradually increased pressure on the dowel bar through the second pressure transmitting plate (3) and the second pressure detector (1') by a second loading device, wherein the pressure when the dowel bar starts to move is the maximum pressure bearable under the action of side friction resistance;
the soil layer side friction resistance of any depth is measured through the steps.
4. The device for measuring the side friction resistance of the soil layer with any depth is characterized by comprising the following components:
the shell is used for bearing the pressure applied to the soil body, one end of the shell is in sliding sealing connection with the confining pressure bearing plate, and the other end of the shell is provided with a hole in sliding sealing connection with the dowel bar;
the confining pressure bearing plate is used for transmitting the loaded load to the soil body, the outer wall of the confining pressure bearing plate is in sliding sealing connection with the inner wall of the shell, and a hole in sliding sealing connection with the dowel bar is formed in the confining pressure bearing plate;
the dowel bar is used for applying load along the axial direction to obtain soil layer side friction resistance, one end of the dowel bar is in sliding sealing connection with the confining pressure bearing plate, and the other end of the dowel bar is in sliding sealing connection with a hole on the end face of the shell;
the pressure detector is also provided with a pressure detector, wherein the first pressure detector (1) is arranged on the confining pressure bearing plate, and the second pressure detector (1') is arranged on the dowel bar;
the shell is horizontally arranged, supported by the detection frame (100) and axially limited;
the dowel bar passes through the shell and the confining pressure bearing plate, and soil is filled between the dowel bar and the inner wall of the shell;
end baffles (1004) are arranged at two ends of the detection frame (100), and a first loading cylinder (102), a pressure transmitting plate and a first pressure detector are arranged between the end baffles at one end and the confining pressure bearing plate;
a second loading cylinder and a second pressure detector are arranged between the end baffle plate at the other end and the confining pressure bearing plate.
5. The device for measuring soil layer side friction resistance at any depth according to claim 4, wherein: the soil body is a simulated soil body (106) which is simulated in a layered manner according to the layered state of the actual soil layer.
6. The device for measuring soil layer side friction resistance at any depth according to claim 4, wherein: in the detection frame (100), at least one supporting seat (1002) is arranged on a bottom plate (1001), and limit seats (108) are arranged on two sides of the supporting seat (1002) on a shell;
a loading cylinder support (1003) for supporting the loading cylinder is provided at a position of the bottom plate (1001) near both ends.
7. The device for measuring soil layer side friction resistance at any depth according to claim 4, wherein: a displacement sensor (101) is arranged between the shell and the dowel bar.
8. A measuring method using the device for measuring soil layer side friction resistance of any depth according to any one of claims 4 to 7, characterized by comprising the steps of:
s1, temporarily and fixedly connecting a dowel bar with a shell, layering and injecting soil body with side friction resistance to be measured into the shell, and flattening and compacting;
s2, temporarily fixing and taking down the dowel bar and the shell, putting the confining pressure bearing plate into the shell, horizontally supporting and fixing the shell on a detection frame (100), installing a first pressure detector (1), a pressure transmitting plate and a first loading cylinder (102), calculating the pressure born by the deep soil layer according to the depth of the soil body to be monitored, loading the pressure on the confining pressure bearing plate by the first loading cylinder (102) through the pressure transmitting plate and the first pressure detector (1), and monitoring the loading pressure by the first pressure detector (1);
s3, installing a second pressure detector (1 '), a pressure transmitting plate and a second loading cylinder (103) on the dowel bar, and loading pressure on the dowel bar through the pressure transmitting plate and the second pressure detector (1') by the second loading cylinder (103), wherein the pressure when the dowel bar starts to move is the maximum pressure born by the action of side friction resistance;
the soil layer side friction resistance of any depth is measured through the steps.
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| CN109932116B (en) * | 2019-02-25 | 2020-12-11 | 河海大学 | Side friction resistance and end bearing force testing system and measuring method |
| CN114910198B (en) * | 2022-03-28 | 2023-05-05 | 中交第二航务工程局有限公司 | Fiber bragg grating side friction resistance sensor and calibration device and method |
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