CN210294255U - Soft soil field soil body parameter long distance continuous measuring device - Google Patents
Soft soil field soil body parameter long distance continuous measuring device Download PDFInfo
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- CN210294255U CN210294255U CN201921009007.4U CN201921009007U CN210294255U CN 210294255 U CN210294255 U CN 210294255U CN 201921009007 U CN201921009007 U CN 201921009007U CN 210294255 U CN210294255 U CN 210294255U
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Abstract
The utility model belongs to the technical field of research such as ground, geology and environment, a weak soil place soil body parameter long distance continuous measurement device is provided, including dragging structure main part I, soil body parameter measurement system II and dragging system III triplex. The utility model provides a device has broken through the limitation that traditional single-point vertical measuring device can not acquire horizontal continuous soil body parameter, can accomplish soil body intensity, strain softening and the horizontal long distance continuous field measurement of soil body and structure interface friction isoparametric through a drag test, and the parameter of surveying can be used to guide the design and the construction of projects such as breakwater engineering, submarine oil gas pipeline, cable, optical cable. Especially along with deep sea oil gas resource development increases day by day, rely on the utility model provides a design and the stability evaluation that the method measures seabed soil body parameter and is applied to engineering facilities such as submarine pipeline, submarine cable have important meaning.
Description
Technical Field
The utility model belongs to the technical field of research such as ground, geology and environment, a weak soil place soil body parameter long distance continuous measurement device is related to, and the device is particularly useful for the soil body parameter investigation before underwater pipeline design and construction.
Background
The accurate measurement of soil parameters is the basis for the implementation of all projects. Soft soil, as a bad soil body, generally has the characteristics of high natural water content, large natural pore ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, poor water permeability and the like. Therefore, the design and construction risk of the soft soil field is higher. The realization of the accurate measurement of the soil body parameters of the soft soil field is an important way for reducing the engineering risk and optimizing the engineering design, and the achievement of the rapid, continuous and accurate measurement is not only an important test for an experimental device, but also a main problem faced by the engineering interface.
The traditional soil body parameter acquisition mainly comprises the steps of acquiring a core sample by methods such as field gravity sampling or drilling sampling and the like, and then completing measurement of soil body related parameters through an indoor test. However, due to the disturbance of the sampling process to the soil and the limitation of the indoor test method, the method is difficult to accurately estimate the soil parameters of the actual field, which inevitably causes adverse effect to the engineering and even influences the engineering safety. In recent years, on-site in-situ test devices are rapidly developed, a static cone penetration test (CPT, CPTU), an in-situ T-bar test, an in-situ Ball-bar test and the like are widely applied, the test precision is remarkably improved, and the test devices have incomparable superiority particularly for soft soil sites. However, the experimental devices obtain soil parameters through single vertical penetration or circular penetration of the measuring equipment aiming at a certain target point, and the experimental devices have good applicability to soil parameter measurement of a single target point. For a large-range long-distance field, the test device cannot measure the change of soil body parameters along the direction of the stratum. The change relation of soil body parameters along the stratum direction can be obtained to a certain extent by arranging more vertical drilling points, but the engineering cost and the time consumption are increased, so that the scheme in the actual engineering becomes impractical. In combination with the problems encountered in the current engineering, an experimental device capable of realizing the long-distance continuous measurement of soil parameters along the stratum direction is urgently needed to be found, and the device has important significance for the design and stability evaluation of the engineering established in the soft soil field.
SUMMERY OF THE UTILITY MODEL
To having the problem that experimental apparatus can not realize following stratum direction long distance measurement soil body parameter, the utility model provides a can realize device of horizontal continuous measurement soil body parameter, the device is applicable in the soil body parameter of bottom weak soil layers such as lake, marsh, river, ocean along stratum direction continuous measurement, finally serves breakwater, submarine oil gas pipeline, cable, optical cable etc. and relies on the engineering that designs and be under construction along stratum direction long distance shallow layer soil body parameter. Especially along with deep sea oil gas resource development increases day by day, relies on the utility model provides a device measures and is applied to the design and the stability evaluation of engineering facilities such as submarine pipeline, submarine cable to seabed soil body parameter and has very important meaning.
The technical scheme of the utility model:
a long-distance continuous measuring device for soil parameters of a soft soil field comprises a towing structure main body I, a soil parameter measuring system II and a towing system III;
the towing structure main body I comprises a towing structure top plate 1, a hollow ribbed plate 2, a towing cable pull ring 3, a counterweight lead block 4, a towing roller 5 and a fixing screw 6; the dragging structure comprises a dragging structure main body I, a dragging structure top plate 1, a hollow ribbed plate 2, a plurality of grooves, a plurality of steel structures and a steel structure, wherein the dragging structure top plate 1 and the hollow ribbed plate 2 form an outer framework of the dragging structure main body I; the upper part of the top plate 1 of the towing structure is provided with a hollow structure for applying a counterweight lead block 4, and cables can be arranged in the hollow rib plates 2; the number of the dragging rollers 5 is 2, the dragging rollers are distributed on two sides of the dragging structure top plate 1 through fixing screws 6, and the dragging rollers 5 can rotate around the fixing screws 6 to control the penetration depth of the hollow rib plates 2; after the dragging roller 5 is adjusted to a specified angle, the fixing screw 6 is screwed down; the counterweight lead block 4 is used for changing the self weight of the towing structure main body I to ensure that the towing structure main body I sinks into the soil layer for a certain depth; the towing cable pull ring 3 is arranged at the front end of the towing structure top plate 1 and is used for being connected with an external towing system III so that the towing structure main body I can move in the soil layer at a constant speed;
the soil body parameter measuring system II comprises a CPT probe 7, a CPT mounting support 8, a T-bar probe 9, a T-bar mounting support 10, a tension-compression sensor 11 and a friction plate 12;
the CPT probe 7 is fixed at the front end of the hollow ribbed slab 2 through a CPT mounting support 8, and the mounting direction of the CPT probe points to the movement direction; acquiring a voltage signal of the CPT probe 7 in a transverse movement process in a test, and determining the resistance of the CPT probe 7 according to the conversion relation between the measured voltage signal and the resistance of the CPT probe 7; then obtaining the soil body strength continuously changing along the movement direction through the relation between the obtained resistance and the soil body strength;
the T-bar mounting support 10 is fixed on the bottom surface of the hollow ribbed slab 2 of the towing structure and arranged along the same straight line, and is used for fixing a tension-compression sensor 11, the tension-compression sensor 11 is connected with a T-bar probe 9, and the T-bar probe 9 points to the moving direction and ensures that the T-bar probes 9 are positioned on the same advancing line; in the process that the device moves in the soil body, the soil body at the same position is disturbed by a plurality of T-bar probes 9 at the bottom end of the towing device; the resistance of the T-bar probe 9 in the advancing process is obtained by measuring a voltage signal of a tension and pressure sensor 11 connected with the T-bar probe 9; for the soil body at the same position, the relation between the resistance borne by the T-bar probe 9 and the number of the T-bar probes 9 corresponding to the disturbed soil body is obtained; combining the relationship between 9 disturbed soil T-bar probes and the accumulated plastic strain generated by the soil to obtain the relationship between the resistance and the accumulated plastic strain; finally determining the relation between the soil strength and the accumulated plastic strain, namely the soil strain softening relation, by combining the relation between the resistance borne by the T-bar probe 9 and the soil strength;
the friction plate 12 is arranged in a groove at the bottom of the hollow ribbed plate 2, and the lower surface of the friction plate is level with the bottom surface of the hollow ribbed plate 2; one end surface and the upper surface of the friction plate 12 are respectively connected with the tension and compression sensors 11 which are transversely and vertically arranged in the grooves at the bottoms of the hollow ribbed plates 2, and one end surface of the friction plate 12 which is not connected with the tension and compression sensors 11 is free; in the process of the towing device moving in the soil body, the voltage signal of the tension and compression sensor 11 is directly measured, and the friction force and the vertical pressure of the soil body borne by the friction plate 12 are obtained through the conversion relation between the voltage signal and the force; for clay, the relationship between the frictional resistance of the soil body passing through the same position and the 12 number of the corresponding friction plates disturbing the soil body and the relationship between the 12 number of the friction plates disturbing the soil body and the relative displacement of the soil body are combined, and finally the relationship between the frictional resistance of the friction plates 12 and the accumulated relative displacement is obtained; for sandy soil, the friction coefficient between the friction plate 12 and the soil body is obtained through the relationship between the friction resistance borne by the friction plate 12 at the same position and the vertical pressure borne by the friction plate, and the relationship between the friction coefficient of the friction plate 12 and the accumulated relative displacement is finally obtained by combining the relationship between the number of the friction plates 12 disturbing the soil body at the same position and the relative displacement generated by the soil body;
the towing system III includes a tow vessel 13, streamer termination equipment 14 and streamers 15; one end of the towing cable 15 is connected with the towing cable pull ring 3, and the other end of the towing cable 15 is connected with the towing cable terminal equipment 14, so that the towing device is dragged to move in the soil layer and transmit the measurement signals of the CPT probe 7 and the sensor 11; the towing cable terminal equipment 14 covers a cable winding and unwinding winch and a measurement signal acquisition system of the CPT probe 7 and the tension and compression sensor 11 and is used for analyzing measurement data by workers in real time; the tug 13 should have a stable power system, which is as good as possible to ensure that it advances at a uniform speed during the test.
The material used between the adjacent friction plates 12 is the same as that used for the friction plates 12, and the distance between the adjacent friction plates 12 is required to be the same as the length of the friction plates 12.
The device provided by the utility model has the main advantages that the continuous soil body parameters along the stratum direction can be obtained, but it should be noted that the T-bar probe 9 explained above can also be a Ball-bar probe or a full-flow injection device probe of other shapes. In addition, the soil parameters described above are only the soil parameters mainly concerned in the embodiments, but not all the soil parameters that can be obtained, and the data obtained by the sensors associated with the embodiments can also be used for determining other parameters, such as the ultra-consolidation ratio, the sensitivity, the relative compactness of sandy soil, the internal friction angle, the compression modulus of soil, the deformation modulus, the non-drainage modulus of saturated clay, the bearing capacity of foundation, the bearing capacity of single pile, and the liquefaction judgment of sandy soil. Accordingly, the detailed description of the main soil parameter acquisition process in the embodiments of the present invention is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.
The utility model has the advantages that:
1) the utility model provides a device has broken through the limitation that traditional single-point vertical measuring device can not acquire the continuous soil body intensity parameter of edge stratum direction, has improved engineering security and has reduced required time cost and economic cost among the engineering actual measurement. By transversely arranging the CPT probes 7 and transversely moving the CPT probes in the soil layer, the soil strength parameters within the towing distance can be continuously obtained.
2) Use the utility model discloses the device that provides transversely lays and makes its lateral shifting in the soil layer through a plurality of T-bar probes 9, can accomplish the field measurement of strain softening parameter through a drag test, has important reference value to analysis seabed structure and seabed side slope stability.
3) The soil body and structure interface friction parameter are ocean engineering design and stability analysis's key and difficult point always, adopt the utility model discloses the device that provides can accomplish the field measurement of soil body and structure interface friction parameter through once pulling the experiment. Meanwhile, through the transverse linear arrangement of the friction plates 12, the friction parameters and the attenuation rules of the soil body under different disturbance degrees can be obtained, and parameter basis is provided for the research of the interaction between the soil and the structure in engineering practice.
4) The foundation the utility model provides a device can realize the continuous measurement of soil body parameter along stratum direction long distance, and the parameter of surveying can be used to guide the design and the construction of engineering such as breakwater, submarine oil gas pipeline, cable, optical cable. Especially along with deep sea oil gas resource development increases day by day, relies on the utility model provides a device measures and is applied to the design and the stability evaluation of engineering facilities such as submarine pipeline, submarine cable to seabed soil body parameter and has important meaning.
Drawings
Fig. 1 is a schematic view of the testing apparatus provided by the embodiment of the present invention.
Fig. 2 is a three-dimensional oblique view of a towing device provided by an embodiment of the present invention.
Fig. 3 is a side view of a towing device according to an embodiment of the present invention.
Fig. 4 is a front view of a towing device according to an embodiment of the present invention.
Fig. 5 is a layout diagram of a bottom device of a towing device according to an embodiment of the present invention.
Fig. 6 is a layout diagram of a local T-bar penetrometer at the bottom end of the towing device provided by the embodiment of the present invention.
Fig. 7 is a schematic diagram illustrating a friction plate measurement at a local position at a bottom end of a towing device according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of the strength change of the soil body measured based on the CPT probe provided by the embodiment of the present invention.
Fig. 9(a) is a schematic diagram of the change of the resistance measured based on different positions of the T-bar probe according to the embodiment of the present invention.
Fig. 9(b) is a schematic diagram of the resistance attenuation relation measured at a certain position based on the T-bar probe according to the embodiment of the present invention.
Fig. 10(a) is a schematic diagram of a change in friction force measured based on a friction plate according to an embodiment of the present invention.
Fig. 10(b) is a schematic view of the vertical pressure change measured based on the friction plate according to the embodiment of the present invention.
Fig. 10(c) is a schematic diagram of the change of the friction coefficient obtained based on the friction plate according to the embodiment of the present invention.
Fig. 11(a) is a schematic diagram of the attenuation relationship of the shear stress obtained based on the friction plate according to the embodiment of the present invention.
Fig. 11(b) is a schematic diagram of the attenuation relationship of the friction coefficient obtained based on the friction plate according to the embodiment of the present invention.
In the figure: 1 dragging a structural top plate; 2 hollow ribbed plates; 3 a streamer pull ring; 4, balancing a lead block; 5 dragging the roller; 6, fixing a screw; 7CPT probe; 8 CPT mounting a support; a 9T-bar probe; mounting a support at 10T-bar; 11 a tension-compression sensor; 12 a friction plate; 13, towing a boat; 14 streamer terminal equipment (covering equipment for retracting and releasing a winch, acquiring data and the like); 15 streamers (with higher tensile strength and which can transmit sensor acquisition signals).
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. The embodiments described herein are some, but not all embodiments of the invention. The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The positional relationship indicated by "up", "down", "left", "right", etc. in the description of the present invention is based on the orientation and positional relationship shown in the drawings, or the orientation or positional relationship that the product of the present invention is usually placed when in use, or the orientation or positional relationship that a person skilled in the art usually understands, and is only for the convenience of description in the present embodiment, and does not indicate or imply that the indicated device and element must have a specific orientation, and therefore, should not be construed as limiting the present invention.
Moreover, the appearance of the ordinal terms "first," "second," "… …," "tenth," etc., in this disclosure is for convenience of description only and is not to be construed as indicating or implying relative importance.
Examples
The embodiment is a long-distance continuous measuring device for soil parameters of a soft soil field, and the experimental device provided by the embodiment is simple, can realize continuous measurement of transverse long-distance soil parameters, and can be used for design and construction of underwater pipelines, cables and other structures.
Referring to fig. 1 and 2, the experimental apparatus for transversely and continuously measuring the soft soil site parameters provided in this embodiment can be completed by one-time transverse dragging of the towing apparatus. The towing device comprises a towing structure top plate 1, a hollow ribbed plate 2, a towing cable pull ring 3, a counterweight lead block 4, a towing roller 5, a fixing screw 6, a CPT probe 7, a CPT mounting support 8, a T-bar probe 9, a T-bar mounting support 10, a tension and compression sensor 11 and a friction plate 12; the tension and compression sensor 11 is respectively connected with the T-bar probe 9 and the T-bar fixed support 10; the CPT probe 7 is connected with the mounting support 8; the friction plates 12 are respectively connected with the tension and compression sensors 11 arranged horizontally and vertically.
With reference to the drawings and the technical scheme, the method mainly comprises the following steps:
first, an assembly towing device
Referring to fig. 2 and 3, the top plate 1 and the hollow rib plate 2 of the towing structure are both made of stainless steel, and the hollow rib plate 2 can be sunk into the soil layer to a certain depth by controlling the counterweight 4 in the test. The towing cable pull ring 3 is arranged at the front end of the top plate 1 of the towing structure and is used for towing the towing device through the towing cable 15 in the test. The 2 CPT probes 7 are connected with the mounting supports 8 and fixed at the front end of the hollow ribbed slab 2. The CPT probe 5 is selected from international standard probes, i.e. the probe has an apex angle of 60 ° and a base area of 10cm2。
Referring to fig. 3, 4 and 5, the T-bar support 10 is arranged at the bottom end of the hollow rib plate 2 of the towing device and is arranged in 8 along the same straight line, and the tension and compression sensors 11 are respectively connected with the T-bar support 10 and the T-bar probe 9 and point to the moving direction of the towing device. The size of the T-bar probe 9 is made of a stainless steel cylinder with the diameter of 4cm and the length of 10 cm.
Referring to fig. 3, 4, 5 and 7, 15 friction plates 12 are uniformly arranged along the longitudinal direction of the bottom end of the hollow rib plate 2 of the towing device, and 8 friction plates 12 are respectively connected with the tension and compression sensors 11 arranged in the transverse direction and the normal direction. The friction plates 12 connected with the tension and compression sensors 11 are provided with the same specification of friction plates 12 between adjacent friction plates 12, and one end of each friction plate 12 is required to be free. The friction plate 12 has a length of 10cm and a width of 5 cm.
Second, device performance detection and debugging
After the assembly of the towing device is finished, the sensitivity and the effectiveness of supporting facilities such as a sensor transmission signal, a towing cable 15 and acquisition equipment 14 are verified by pulling and pressing the CPT probe 7, the T-bar probe 9 and the friction plate 12, and data trial acquisition is carried out through the towing cable terminal equipment 14 in a test. And (4) after the equipment is completely detected without problems, preparing the next experiment.
Thirdly, the towing device is thrown on the surface of the soil layer to be measured
The assembled towing device is slowly placed on the surface of the soil body through a gantry crane or other hoisting equipment, the lowering speed is controlled in the lowering process, and damage to the equipment due to large inertia force is avoided. After the towing apparatus is lowered to the desired position, the towing cable 15 is lowered further and the towing vessel 13 is advanced at a low speed, the length of the towing cable 15 being controlled so that it is at a sufficiently small angle (typically within 30 °) to the surface of the mud. And after the towline 15 reaches a specified angle, checking the running condition of the towline terminal equipment 14, and after the equipment is checked to be correct, starting the data acquisition equipment.
Fourthly, transverse dragging of the dragging device
After the test preparation work is ready, the tug 13 is adopted to drag the towing device along the designated direction, the speed and the direction of the tug are strictly controlled during dragging, the tug 13 is ensured to advance at a constant speed as much as possible, and the collected data is observed, analyzed and stored in real time.
Fifth, recovery of the plant
After the experiment is finished, the tug 13 slowly backs up and simultaneously tightens the towing cables 15, lifts the towing device upwards, and carries out equipment inspection and storage after being recovered to the deck of the tug 13.
Sixth, processing of measurement data
After the experimental completion of once dragging, the utility model provides a device measuring main soil body parameter and data analysis process as follows.
1) Determination of shear strength of soil mass
The shear strength of the soil body is one of important soil body parameters, and is mainly determined according to the measurement result of a static Cone Penetration Test (CPT) probe 7, and the soil body strength calculation process is as follows:
wherein: qcThe cone tip resistance of the probe, N; a is the area of the cone bottom of the probe, m2；NktThe bearing capacity coefficient of the probe is between 11 and 19, and the value is generally 15.0. According to the test device and the intensity calculation method provided by the utility model, the soil body intensity change relationship after the test is shown in fig. 8.
2) Determination of soil mass strain softening parameters
The strain softening parameters are calculated and mainly obtained by analyzing the measurement data of the tension and compression sensors 11 corresponding to the T-bar probes 9 at different positions at the bottom ends of the hollow ribbed plates 2 of the towing device, and the resistance change condition of the T-bar probes 9 in the towing process of the towing device is shown in fig. 9 (a).
The strain softening model of the soil body is as follows:
wherein: su0The initial strength of the soil body is kPa; deltaremSensitivity to the soil body (S)t) ξ95The accumulated plastic strain value is corresponding to 95% reduction of the soil strength.
Initiation of soil bodiesStrength(s)u0) The measurement result of the first T-bar probe 9 in the bottom end movement direction of the hollow ribbed plate 2 of the towing device is adopted for determination, and the calculation process is as follows:
wherein: q. q.sT-barIs the resistance of the T-bar probe 9 in the transverse movement process in the soil body; n is a radical ofT-barThe bearing capacity coefficient of the T-bar is between 9.14 and 11.94, and the value is generally 10.5; d is the diameter of T-bar, m; l is the length of the T-shaped head in the selected T-bar, m.
After the soil body at the same position is disturbed by the plurality of T-bar probes 9, the resistance attenuation relation is as follows:
wherein n is the number of the T-bar probes passing through at the same position along the movement direction, the average value of the strain in the penetration process is considered, the counting is generally started from 0.25, and the average value is gradually accumulated by 0.5 according to the number of the T-bar probes 9, namely the value of n is gradually changed in an increasing way for 0.25, 0.75 and 1.25; q. q.snTo start counting the resistance value, q, experienced by the corresponding nth T-bar probe 9 along the direction of motioninThe resistance value, q, of the T-bar probe 9 at the foremost end in the direction of motionremIs the resistance value of the last T-bar probe 9 (the value corresponding to the stable resistance, generally the last measured resistance value of T-bar), N95The number of the T-bar probes is 9 corresponding to the intensity reduction of 95%. After the soil body at a certain position is disturbed by the T-bar probe 9 for different times, the measured resistance attenuation situation is shown in fig. 9(b), N95Can be obtained by analysis of the resistance-attenuation relationship as shown in fig. 9 (b).
Sensitivity of the soil body (S)t) The estimation can be done according to the following formula:
ξ95can be calculated by，
ξ95＝2N95ξT-bar
ξ thereinT-barThe calculation can be performed as follows,
ξT-bar＝0.83log(St)+3.09
3) determination of soil-structure interface friction parameters
The interfacial friction coefficient between the soil and the structure is obtained by measuring the pressure and frictional resistance to which the friction plate 12 is subjected at the bottom end of the towing device. The soil body friction parameter obtaining steps are as follows:
3.1) cohesive soil Friction parameter
Because the soil body at the same position can be subjected to the friction action of a plurality of friction plates 12 at the bottom end of the device in the forward dragging process of the dragging device, and the disturbance conditions of different friction plates 12 on the soil body are different, the friction resistance of the friction plates 12 can be obviously different. The frictional resistance of the friction plate 12 is obtained by the vertical tension and compression sensor 11, the transverse friction force in the test is shown in fig. 10(a), and the shear stress of the m-th friction plate 12 at the same position in the soil body is
In the formula: ff,mThe friction force N borne by the mth friction plate 12 is analyzed; w is the width of a single friction plate 12, m; l is the length, m, of the single friction plate 12.
After the friction action of the m friction plates 12, the friction displacement of the soil body is
S(m)＝mL
Through the above calculation, the attenuation law of the soil-structure interface friction parameter (shear stress ratio) of the cohesive soil material can be obtained, as shown in fig. 11 (a).
3.2) Sand Friction parameters
The coefficient of friction between the earth and the structure is obtained by measuring the pressure and frictional resistance of the friction plate 12 at the bottom end of the towing device. In the dragging process, the vertical pressure applied to the friction plate 12 is obtained by measuring through the vertical tension and compression sensor 11, and the change condition of the vertical pressure applied to the friction plate 12 in the test is shown in fig. 10 (b); the friction force borne by the friction plate 12 is obtained according to the measurement result of the tension-compression sensor 11 transversely arranged on the friction plate, and the transverse friction is obtained in the test
The force is shown in fig. 10 (a). According to the coulomb friction criterion, the coefficient of friction can be calculated by the following formula.
Wherein: ffIs the transverse friction force, N, to which the friction plate 12 is subjected during towing; fNIs the vertical pressure, N, to which the friction plate 12 is subjected during towing. The change in the friction coefficient of the friction plate 12 at different positions during towing is shown in fig. 10 (c).
The coefficient of friction of the soil body at the same position is
Wherein: fN,mFor analyzing the vertical pressure, N, on the mth friction plate 12; the damping relationship of the friction coefficient obtained after the test with the frictional displacement is shown in fig. 11 (b).
The above is merely a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A long-distance continuous measuring device for soil parameters of a soft soil field is characterized by comprising a towing structure main body I, a soil parameter measuring system II and a towing system III;
the towing structure main body I comprises a towing structure top plate (1), hollow rib plates (2), towing cable pull rings (3), counterweight lead blocks (4), towing rollers (5) and fixing screws (6);
the towing structure comprises a towing structure main body I and is characterized in that a towing structure top plate (1) and a hollow ribbed plate (2) form an external framework of the towing structure main body I, the front end face of the hollow ribbed plate (2) is an arc-shaped face, and the bottom surface of the hollow ribbed plate (2) is provided with a plurality of grooves; the upper part of the top plate (1) of the towing structure is provided with a hollow structure for applying a counterweight lead block (4), and cables can be arranged in the hollow rib plates (2);
the number of the dragging rollers (5) is 2, the dragging rollers are arranged on two sides of the dragging structure top plate (1) through fixing screws (6), and the dragging rollers (5) can rotate around the fixing screws (6) to control the penetration depth of the hollow rib plate (2); after the dragging roller (5) is adjusted to a specified angle, the fixing screw (6) is screwed down; the counterweight lead block (4) is used for changing the self weight of the towing structure main body I to ensure that the towing structure main body I is sunk into a soil layer for a certain depth; the towing cable pull ring (3) is arranged at the front end of the towing structure top plate (1) and is used for being connected with an external towing system III so that the towing structure main body I can move at a constant speed in a soil layer;
the soil body parameter measuring system II comprises a CPT probe (7), a CPT mounting support (8), a T-bar probe (9), a T-bar mounting support (10), a tension and compression sensor (11) and a friction plate (12);
the CPT probe (7) is fixed at the front end of the hollow ribbed slab (2) through a CPT mounting support (8), and the mounting direction of the CPT probe points to the movement direction;
the T-bar mounting support (10) is fixed on the bottom surface of the hollow ribbed plate (2) of the towing structure and arranged along the same straight line, and is used for fixing a tension-compression sensor (11), the tension-compression sensor (11) is connected with a T-bar probe (9), and the T-bar probe (9) points to the movement direction and ensures that the T-bar probes (9) are positioned on the same travelling line; in the process that the device moves in the soil body, the soil body at the same position is disturbed by a plurality of T-bar probes (9) at the bottom end of the towing device;
the friction plate (12) is arranged in a groove at the bottom of the hollow ribbed plate (2), and the lower surface of the friction plate is level with the bottom surface of the hollow ribbed plate (2); one end surface and the upper surface of the friction plate (12) are respectively connected with a tension and compression sensor (11) which is transversely and normally arranged in a groove at the bottom of the hollow ribbed plate (2), and one end surface of the friction plate (12) which is not connected with the tension and compression sensor (11) is free;
the towing system III comprises a tow vessel (13), a streamer terminal device (14) and a streamer (15);
one end of the towing cable (15) is connected with the towing cable pull ring (3), and the other end of the towing cable (15) is connected with the towing cable terminal equipment (14) and used for dragging the towing device to move in the soil layer and transmitting the measurement signals of the CPT probe (7) and the sensor 11;
the towing cable terminal equipment (14) covers a cable winding and unwinding winch, a CPT probe (7) and a measurement signal acquisition system of the tension and compression sensor (11) and is used for analyzing measurement data by workers in real time;
the tug (13) should have a stable power system, which ensures as far as possible a uniform speed of advance during the test.
2. A long-distance continuous measuring device for soil parameters of a soft soil field according to claim 1, characterized in that the material used between the adjacent friction plates (12) is the same as the material used for the friction plates (12), and the distance between the adjacent friction plates (12) is required to be the same as the length of the friction plates (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921009007.4U CN210294255U (en) | 2019-07-01 | 2019-07-01 | Soft soil field soil body parameter long distance continuous measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921009007.4U CN210294255U (en) | 2019-07-01 | 2019-07-01 | Soft soil field soil body parameter long distance continuous measuring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346535A (en) * | 2019-07-01 | 2019-10-18 | 大连理工大学 | A kind of weak soil soil response parameter long range continuous measuring device |
| CN110346536A (en) * | 2019-07-01 | 2019-10-18 | 大连理工大学 | A kind of a wide range of weak soil soil response continuous parameters measuring device |
| CN111398036A (en) * | 2020-04-22 | 2020-07-10 | 天津大学 | Measure dilatory test system of intelligence of undersea structure atress |
| CN111398036B (en) * | 2020-04-22 | 2024-05-10 | 天津大学 | Intelligent drag test system for measuring stress of submarine structure |
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2019
- 2019-07-01 CN CN201921009007.4U patent/CN210294255U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346535A (en) * | 2019-07-01 | 2019-10-18 | 大连理工大学 | A kind of weak soil soil response parameter long range continuous measuring device |
| CN110346536A (en) * | 2019-07-01 | 2019-10-18 | 大连理工大学 | A kind of a wide range of weak soil soil response continuous parameters measuring device |
| CN110346535B (en) * | 2019-07-01 | 2024-04-12 | 大连理工大学 | Soft soil site soil body parameter long-distance continuous measurement device |
| CN111398036A (en) * | 2020-04-22 | 2020-07-10 | 天津大学 | Measure dilatory test system of intelligence of undersea structure atress |
| CN111398036B (en) * | 2020-04-22 | 2024-05-10 | 天津大学 | Intelligent drag test system for measuring stress of submarine structure |
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