Power penetration energy dissipation quantification method based on fiber sensor array and application

Abstract

The present application relates to a kind of power sounding energy dissipation quantification method based on optical fiber sensor array, which is realized to the spatial continuous monitoring of force and speed parameters in power sounding process by arranging optical fiber sensor array along the length direction of sounding rod, overcome the limitation of traditional single-point measurement;Based on the measured data of upstream sensor, the theoretical value of downstream sensor is predicted, and compared with the measured value, the accurate quantification of energy loss is realized;Then by subsection energy loss and accumulation, the overall quantification of sounding rod energy loss is realized;The method effectively utilizes the advantages of optical fiber sensing technology against electromagnetic interference, ensures high-fidelity signal acquisition under high-frequency impact working condition, and finally realizes the reliable quantification of power sounding energy dissipation, and the application of the method is also provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geotechnical engineering in-situ testing, in particular to a dynamic sounding energy dissipation quantification method based on an optical fiber sensor array and application. BACKGROUND

[0002] Before carrying out various scales of engineering construction, the geological origin, physical and chemical properties, and mechanical and hydraulic characteristics of the foundation soil body need to be systematically mastered, and geotechnical engineering investigation work needs to be carried out. The implementation scale of such investigation is determined comprehensively according to the importance level of the project, the functional positioning, and the complexity of the soil body. Such investigation usually covers technical means such as drilling sampling, in-situ testing, and indoor soil test.

[0003] Although the indoor test can accurately determine the basic parameters of the soil body, the core advantage of in-situ testing is that it can carry out testing under the natural stress state of the soil body, avoiding disturbance errors. In the current in-situ testing method system, penetration testing is widely used due to its advantages of convenient operation, high cost-effectiveness, and strong adaptability to strata. Such testing equipment (such as dynamic sounding instrument, static sounding instrument) has multiple specifications and penetration capabilities, and its engineering application covers from preliminary investigation of shallow foundation bearing capacity calculation to fine evaluation of rheological property parameters of complex site soil body, forming a technical system covering different investigation stages.

[0004] Dynamic sounding test, as a classic in-situ testing method, penetrates the soil layer with a conical probe through the impact energy generated by the free fall of a standard weight, and evaluates the mechanical parameters such as soil density and bearing capacity according to the number of hammer blows, and is widely used in geotechnical engineering investigation. The core principle is to transmit the hammer energy to the probe through the probe rod and overcome the soil resistance to achieve penetration. However, the probe rod inevitably has energy loss in the energy transmission process, mainly including: ① elastic deformation energy dissipation of the probe rod material; ② energy loss caused by friction between the probe rod and the surrounding soil wall; ③ attenuation of stress wave in the probe rod (geometric diffusion and material damping effect). These losses result in actual effective energy acting on the probe being less than the initial hammer energy, which further affects the accuracy of the stratum parameter judgment. In the existing technology, the energy dissipation correction of the probe rod depends on experience and lacks quantitative analysis of the energy transmission process. The existing method cannot accurately quantify the dynamic energy dissipation under different rod lengths, resulting in systematic errors in the test results, especially under long probe rods or complex stratum conditions, the limitations of empirical correction are more significant.

[0005] In recent years, some studies have attempted to introduce sensor technology to improve the accuracy of energy monitoring. By installing accelerometers and strain gauges at the probe or anvil, combined with integral operation to calculate hammer energy. Although this method improves the rigid rod assumption of the Dutch formula to some extent, it still has the following problems:

[0006] 1. Insufficient durability of sensors: The accelerometers and strain gauges at the probe directly bear high-frequency impact loads and are prone to damage due to fatigue or overload, making it difficult to ensure the reliability of long-term testing;

[0007] 2. Limitations of single-point monitoring: Energy loss is only inferred from probe data, unable to capture the dynamic attenuation of stress waves along the length of the rod, making it difficult to quantify segmental energy dissipation;

[0008] 3. Weak anti-interference ability: Electrical sensors are easily affected by electromagnetic interference (such as generators and high-voltage lines) or humid environments, leading to signal drift or distortion.

[0009] The successful application of stress wave theory in pile foundation detection (such as Case method, CAPWAP method) provides a new idea for probe energy analysis. In theory, by measuring strain waveforms at different positions of the probe, the stress wave energy transfer process can be inverted, and elastic deformation energy and friction dissipation energy can be separated. However, existing technologies focus on pile-soil systems and rely on complex numerical inversion algorithms, making it difficult to directly transplant to the dynamic sounding field. In addition, the layout density and sampling frequency of traditional resistance strain gauges or piezoelectric sensors are limited, which cannot meet the measurement requirements of long probe multi-point and high dynamic response.

[0010] The rapid development of optical fiber sensing technology provides a breakthrough direction for the above problems. However, existing research has not systematically explored the application of optical fiber sensor arrays in dynamic sounding energy dissipation quantification. SUMMARY

[0011] Based on the above description, the present application provides a dynamic sounding energy dissipation quantification method based on an optical fiber sensor array to solve the technical problem that the energy dissipation quantification of the probe in the prior art relies on experience and lacks quantitative analysis of the energy transfer process.

[0012] The technical solution of the present application to solve the above technical problems is as follows:

[0013] A dynamic sounding energy dissipation quantification method based on an optical fiber sensor array, comprising the following steps:

[0014] Installation of the optical fiber sensor array: multiple optical fiber sensors are installed along the length direction of the probe to form an optical fiber sensor array;

[0015] Obtaining probe parameters;

[0016] Theoretical value calculation, based on the probe rod parameters, calculating the theoretical values of the force and speed at the corresponding positions of the sensor located downstream according to the measured values of the force and speed at the corresponding positions of the sensor located upstream among any two sensors;

[0017] Energy dissipation calculation, determining the sectional loss amount of energy between the two sensors according to the measured values and the theoretical values of the force and speed at the corresponding positions of the sensor located downstream, and calculating the energy loss amount of the whole probe rod according to the sectional loss amount.

[0018] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects:

[0019] The technical scheme realizes the spatial continuous monitoring of the force and speed parameters in the dynamic sounding process by arranging the optical fiber sensor array along the length direction of the probe rod, overcoming the limitations of the traditional single-point measurement; the prediction of the theoretical values of the downstream sensor is realized based on the measured data of the upstream sensor, and the energy loss is accurately quantified by comparing the measured values; then the overall quantification of the energy loss of the probe rod is realized by segmenting the energy loss and accumulating; the method effectively utilizes the advantages of the optical fiber sensing technology in resisting electromagnetic interference, ensures the high-fidelity signal acquisition under high-frequency impact working conditions, and finally realizes the reliable quantification of the energy dissipation of the dynamic sounding, which can be widely applied to the dynamic sounding test of complex strata such as sandy soil, clay and gravel layer, and provides high-precision soil mechanical parameters for pile foundation bearing capacity evaluation, slope stability analysis and underground engineering investigation.

[0020] On the basis of the above technical scheme, the present application can also be improved as follows.

[0021] Further, a plurality of optical fiber sensors are installed along the length direction of the probe rod to form an optical fiber sensor array, specifically:

[0022] Grooves are spaced along the axial direction on the surface of the probe rod, the optical fiber sensors are embedded in the grooves, and impact-resistant epoxy resin is used for packaging, the optical fiber is led out through the reserved channel inside the probe rod, and connected to the optical fiber demodulator.

[0023] Further, the grooves are uniformly spaced in the length direction of the probe rod, and the interval length is determined by the length of the probe rod.

[0024] Further, the interval between the first end sensor located upstream and the hammering point of the probe rod is not greater than 0.5 m, and the terminal sensor located downstream is arranged close to the probe head of the probe rod.

[0025] Further, the optical fiber sensor is a Bragg fiber grating sensor.

[0026] Further, the probe rod parameters include the cross-sectional area of the sensor installation place on the probe rod and the elastic modulus , and the density of the probe rod .

[0027] Further, the calculating the theoretical values of the force and the velocity at the corresponding position of the sensor located downstream according to the measured values of the force and the velocity at the corresponding position of the sensor located upstream is specifically:

[0028] obtaining the strain signal at the upstream sensor and separating it into the upstream down-going wave by Fourier transform and the upstream up-going wave , obtaining the measured values of the force and the velocity at the upstream sensor through the constitutive relation and :

[0029]

[0030] obtaining the measured values of the force and the velocity at the upstream sensor and obtaining the theoretical values of the force and the velocity at the corresponding position of the sensor located downstream through the frequency-domain phase shift formula and :

[0031]

[0032] wherein, is the distance between the upstream sensor and the downstream sensor; is the wave propagating downward and passing through the upstream sensor, is the wave propagating upward and passing through the upstream sensor; is the impedance of the probe rod, wherein is the cross-sectional area of the rod, is the density of the probe rod, is the number of the sensor array.

[0033] Further, the segmental loss of energy between the two sensors is determined according to the measured values of the force and the velocity at the corresponding position of the sensor located downstream and the determined theoretical values of the force and the velocity at the corresponding position, and the overall energy loss of the probe rod is calculated according to the segmental loss of energy, which is specifically:

[0034] obtaining the strain signal at the downstream sensor and separating it into the downstream down-going wave by Fourier transform and the downstream up-going wave , obtaining the measured values of the force and the velocity at the downstream sensor through the constitutive relation and :

[0035]

[0036] The difference between the power theoretical value of the downstream sensor and the power measured value thereof is taken to calculate the energy loss amount between the upstream sensor and the downstream sensor:

[0037]

[0038] The energy loss amounts of all segments of the optical fiber sensor array are accumulated to obtain the energy loss amount of the whole probe rod:

[0039] .

[0040] Further, after the energy dissipation calculation step, it further includes:

[0041] Rod length adaptive correction, fitting energy dissipation Decay function with rod length L The rod length correction coefficient is established to adapt to different rod lengths: Wherein, is the total energy of hammering.

[0042] The application also provides an application of a dynamic sounding energy dissipation quantification method based on an optical fiber sensor array, which establishes an energy dissipation model according to the above dynamic sounding energy dissipation quantification method, and inversely calculates the dynamic penetration resistance of the soil body by combining the sounding data with the energy dissipation model:

[0043]

[0044] Wherein is the penetration degree, is the rod length correction coefficient. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a schematic diagram of the physical plane of the probe rod in which the middle wave changes at the connection;

[0046] Figure 2 is a step diagram of a dynamic sounding energy dissipation quantification method based on an optical fiber sensor array provided by the embodiment of the application;

[0047] Figure 3 is a schematic diagram of the installation position of the optical fiber sensor array in the embodiment of the application;

[0048] Figure 4 is a schematic diagram of the packaging profile structure of the optical fiber sensor in the embodiment of the application;

[0049] Figure 5 is a schematic diagram of the notched groove for installing the sensor on the probe rod in the embodiment of the application. DETAILED DESCRIPTION

[0050] For the purpose of facilitating the understanding of the present application, a more complete description of the present application will be made with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0052] In the prior art, the application of the fiber sensor array in the energy dissipation quantification of the dynamic penetration has not been systematically explored, and the following difficulties need to be overcome: ① how to design the sensor packaging structure to withstand high-frequency impact load; ② how to combine the strain data of multiple measuring points with the wave mechanics model to build a quantitative calculation framework of energy dissipation; ③ how to establish a self-adaptive correction model of the rod length through the measured data to replace the empirical formula.

[0053] In practical applications, the geometric discontinuity (such as threaded joints) at the connection of the probe rod will introduce local wave impedance changes, resulting in multiple reflections and transmissions (see Figure 1 , Figure 1 The physical plane diagram for the change of the wave in the probe rod at the connection is shown in the figure, wherein the abscissa represents the position of the wave on the propagation path, and the ordinate represents the propagation time of the wave, and l and r are respectively marked at different geometric discontinuities on the probe rod. Such phenomena make it difficult for traditional single-point measurement (such as an accelerometer at the probe) to separate the incident wave and the reflected wave components, resulting in energy calculation deviation. For example, Fairhurst (1961) pointed out that when two rods are ideally impacted, the contact surface needs to satisfy force balance ( ) and velocity continuity ( ), and the nonlinear contact of the probe rod connection in the actual dynamic penetration system can significantly change the wave form.

[0054] Therefore, in order to accurately quantify the energy dissipation, the present application introduces a distributed fiber sensor array, and based on this concept, a dynamic penetration energy dissipation quantification method based on the fiber sensor array is proposed, as shown in Figure 2 , which includes the following steps:

[0055] Installation of the fiber sensor array: a plurality of fiber sensors are installed along the length direction of the probe rod to form a fiber sensor array;

[0056] Obtaining the probe rod parameters;

[0057] Theoretical value calculation, the theoretical values of force and speed at the corresponding positions of the sensor located downstream are determined according to the measured values of force and speed at the corresponding positions of the sensor located upstream among any two sensors;

[0058] Energy dissipation calculation, the sectional loss amount of energy between the two sensors is determined according to the measured values and the theoretical values of force and speed at the corresponding positions of the sensor located downstream, and the energy loss amount of the whole probe rod is calculated according to the sectional loss amount.

[0059] In order to have a more comprehensive understanding of the technical solutions of the present application, the following will be described in detail:

[0060] Step 1: installation of the fiber sensor array, a plurality of fiber sensors are installed along the length direction of the probe rod to form a fiber sensor array;

[0061] First, the probe rod is pretreated, grooves are spaced along the axial direction on the surface of the probe rod (the interval is 0.1-0.2 times the length of the rod), the groove depth is 1 / 10 of the diameter of the probe rod, and the groove width is slightly larger than the diameter of the fiber, such as Figure 4 shown, the probe rod has a radius of 42 mm, a groove depth of 4.2 mm, and a groove width of 1.05 mm. The groove position can not avoid the probe rod connecting thread, and the energy dissipation value at the connecting thread is quantified on the premise of ensuring the structural strength.

[0062] Then, the fiber sensor is embedded, and the fiber sensor in the embodiment of the present application is preferably a Bragg fiber grating (FBG). A plurality of FBGs can be connected in series on the same fiber, and multi-point quasi-distributed measurement can be achieved through wavelength division multiplexing (WDM) or time division multiplexing (TDM) technology, which is suitable for long-distance or complex structure monitoring. The FBG has high sensitivity and stability, and a wide dynamic response range. It can be understood that, in the case of meeting the better measurement effect, other fiber sensors can also be used in the embodiment of the present application, which will not be described here.

[0063] The Bragg fiber grating (FBG) sensor is embedded in the groove, and impact-resistant epoxy resin packaging is adopted (as shown in Figure 4 and Figure 5 ), that is, taking the fiber core with a diameter of 0.125 mm as the axis, coating about 0.2 mm thick epoxy resin packaging material on the outer periphery, to ensure the stable installation of the fiber sensor. The sensor array is arranged along the axial direction of the probe rod, and the first end sensor A (numbered ) located downstream is located about 0.5 meters below the hammering point. The first end sensor A is close to the hammering point, which can accurately obtain the initial energy data of the hammering as much as possible, to ensure the quantitative accuracy. The remaining sensors (numbered ) are distributed at equal intervals until the vicinity of the probe, and the last end sensor located downstream is close to the probe of the probe rod, which can effectively ensure the accurate collection of the probe position signal, to ensure the continuity and data reliability of the overall quantification.

[0064] Wherein, the optical fiber is led out through the reserved channel inside the probe rod, connected to the high-speed optical fiber demodulator (sampling frequency ≥ 10 kHz) for real-time acquisition of the strain time history curve of each sensor .

[0065] Step 2, obtain the probe rod parameters

[0066] Wherein, the probe rod parameters include the cross-sectional area of the sensor installation place on the probe rod And the elastic modulus , the density of the probe rod .

[0067] Specifically, the following parameters are obtained through indoor test or probe rod design data:

[0068] The cross-sectional area of the probe rod at each sensor installation place (Note that the effective area after grooving is considered), the elastic modulus of the probe rod material And the density of the probe rod , and the wave speed And the wave impedance are calculated for subsequent preparation .

[0069] Step 3, theoretical value calculation, based on the probe rod parameters, the measured values of force and velocity at the corresponding position of the sensor located upstream of any two sensors are used to calculate and determine the theoretical values of force and velocity at the corresponding position of the sensor located downstream

[0070] For ease of understanding and description, in this embodiment, the sensor located upstream of the two sensors is exemplified by the first-end sensor A (number ), specifically, the strain signal at the first-end sensor A is first obtained And separated into the upstream downgoing wave And the upstream upgoing wave Through the constitutive relation, the measured values of force and velocity at the upstream sensor are obtained And :

[0071]

[0072] Then, according to the measured values of force and velocity at the upstream sensor And Through the frequency domain phase shift formula, the theoretical values of force and velocity at the downstream sensor ( ) are obtained And :

[0073]

[0074] obtaining strain signals at the downstream sensor M and separating them into downstream down-going waves by Fourier transform and downstream up-going waves , obtaining measured values of force and velocity at the downstream sensor by constitutive relation and :

[0075]

[0076] Taking the difference between the power theoretical value of the downstream sensor and the power measured value thereof, the energy loss amount between the upstream sensor and the downstream sensor is calculated:

[0077]

[0078] The energy loss amount of the whole probe rod is obtained by accumulating the energy loss amounts of all segments of the optical fiber sensor array.

[0079]

[0080] wherein, is the distance between the upstream sensor A and the downstream sensor M; is the wave propagating downward and passing through the upstream sensor, is the wave propagating upward and passing through the upstream sensor; is the impedance of the probe rod, wherein is the cross-sectional area of the rod, is the density of the probe rod, is the number of sensor arrays.

[0081] Step 4, energy dissipation calculation, determining the segmental energy loss amount between the two sensors according to the measured values of force and velocity at the corresponding positions of the downstream sensor and the determined theoretical values of force and velocity at the corresponding positions, and calculating the energy loss amount of the whole probe rod according to the segmental loss amount.

[0082] Specifically, first, strain signals at the downstream sensor are obtained and separating them into downstream down-going waves by Fourier transform and downstream up-going waves , obtaining measured values of force and velocity at the downstream sensor by constitutive relation and :

[0083]

[0084] Then, the difference between the power theoretical value of the downstream sensor and the power measured value thereof is taken, and the energy calculation formula is:

[0085]

[0086] The energy loss amount between the upstream sensor and the downstream sensor is calculated:

[0087]

[0088] Finally, the energy loss amounts of all segments of the optical fiber sensor array are accumulated to obtain the energy loss amount of the whole probe rod:

[0089] .

[0090] In order to realize the method to dynamically adapt to different rod lengths (10-50 meters) and complex stratum conditions, the method further includes the following steps after step 4, energy dissipation calculation:

[0091] Step 5, rod length self-adaptive correction, fitting energy dissipation Decay function with rod length L The rod length correction coefficient is established to adapt to different rod lengths: wherein, is the total energy of hammering,

[0092] For example, the fitted decay function is (wherein the coefficient , is calibrated through actual experiments).

[0093] The method realizes the spatial continuous monitoring of the force and speed parameters in the dynamic sounding process by arranging the optical fiber sensor array along the length direction of the probe rod, and overcomes the limitations of the traditional single-point measurement; the theoretical value at the corresponding position of the downstream sensor is predicted based on the measured data of the upstream sensor, and compared with the measured value, to realize the accurate quantification of the energy loss; then the overall quantification of the energy loss of the probe rod is realized through the accumulation of the segmented energy loss; the method effectively utilizes the advantages of the optical fiber sensing technology in resisting electromagnetic interference, ensures the high-fidelity signal acquisition under high-frequency impact working conditions, and finally realizes the reliable quantification of the dynamic sounding energy dissipation, which can be widely applied to the dynamic sounding test of complex strata such as sandy soil, clay, gravel layer, etc., and provides high-precision soil mechanical parameters for pile foundation bearing capacity evaluation, slope stability analysis and underground engineering investigation.

[0094] Based on the above dynamic sounding energy dissipation quantification method, the embodiment of the application further provides an application of a dynamic sounding energy dissipation quantification method based on an optical fiber sensor array, which establishes an energy dissipation model according to the above dynamic sounding energy dissipation quantification method, and inverses the soil dynamic penetration resistance by combining the sounding data with the energy dissipation model:

[0095]

[0096] wherein for the penetration depth, for the rod length correction factor.

[0097] In summary, the present application has at least the following advantages:

[0098] 1. Breakthrough rigid rod assumption and empirical correction limitations: Real-time monitoring of dynamic strain of the probe rod by distributed optical fiber sensor array, combined with one-dimensional elastic wave theory to invert the stress wave propagation process, quantifying the comprehensive energy dissipation of probe rod elastic deformation, sidewall friction and wave attenuation, completely abandoning the rigid rod assumption and empirical correction of the Dutch formula.

[0099] 2. High-precision energy dissipation segmentation quantization: Based on multi-point strain data to separate incident and reflected wave components, through frequency domain phase shift algorithm to calculate the energy loss difference between adjacent sensors (ΔEi) , achieving millimeter-level spatial resolution of probe rod energy dissipation.

[0100] 3. Rod length adaptive dynamic correction: Through the energy dissipation attenuation function (Ei) ) and correction factor (ki) , dynamically adapting to different rod lengths (10-50 meters) and complex stratum conditions.

[0101] 4. Significant improvement in anti-interference and durability: Fiber Bragg grating (FBG) sensors are packaged with impact-resistant epoxy resin, resistant to 60000g impact acceleration, and resistant to electromagnetic interference, moisture and corrosion, and can still work stably for more than 5 years in harsh environments such as high-voltage transmission lines and wet pits.

[0102] 5. Multi-physical field coupling inversion capability: Fusion of dynamic cone tip resistance (Rt) ) and dynamic energy dissipation data, to build a soil dynamic penetration resistance model (Rd) )

[0103] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for quantifying energy dissipation of dynamic penetration based on an array of fiber optic sensors, characterized in that, The method comprises the following steps: mounting of the fiber sensor array, mounting a plurality of fiber sensors along the length direction of the probe rod to form a fiber sensor array; acquiring probe rod parameters; theoretical value calculation, based on the probe rod parameters, calculating the theoretical values of force and speed at the corresponding positions of the sensors located downstream from the sensors located upstream from any two sensors according to the measured values of force and speed at the corresponding positions of the sensors located upstream; energy dissipation calculation, determining the segmental energy loss amount between two sensors according to the measured values of force and speed at the corresponding positions of the sensors located downstream and the determined theoretical values of force and speed at the corresponding positions, and calculating the overall energy loss amount of the probe rod according to the segmental energy loss amount; the calculation of the theoretical values of force and speed at the corresponding positions of the sensors located downstream from the sensors located upstream from any two sensors according to the measured values of force and speed at the corresponding positions of the sensors located upstream based on the probe rod parameters is specifically: Obtain strain signal at upstream sensor and separate it into upstream downgoing wave using Fourier transform and upstream upgoing wave Obtain measured values of force and velocity at upstream sensor through constitutive relation and : Theoretical values of force and velocity at the downstream sensor are obtained by the frequency domain phase shift formula and Theoretical values of force and velocity at the downstream sensor are obtained by the frequency domain phase shift formula and : wherein is the elastic modulus of the probe rod material; is the upstream down-going wave; is the upstream up-going wave; is the distance between the upstream sensor and the downstream sensor; is the wave that travels down and past the upstream sensor, is the wave that travels up and past the upstream sensor; is the impedance of the probe rod, wherein is the cross-sectional area of the rod, is the density of the probe rod, is the number of sensors in the array.

2. The method of claim 1, wherein the array of fiber optic sensors is configured to measure the energy dissipated by the dynamic penetration probe. mounting a plurality of fiber sensors along the length direction of the probe rod to form a fiber sensor array is specifically: axially spaced grooves are engraved on the surface of the probe rod, fiber sensors are embedded in the grooves, and impact-resistant epoxy resin is used for packaging, the fiber is led out through the reserved channel inside the probe rod, and connected to the fiber demodulator.

3. The method according to claim 2, wherein: the grooves are uniformly spaced in the length direction of the probe rod, and the interval length is determined by the length of the probe rod.

4. The method of claim 2, wherein the array of fiber optic sensors is configured to measure the energy dissipated by the dynamic penetration probe. The interval between the first sensor located upstream and the hammering point of the probe rod is not greater than 0.5 m, and the last sensor located downstream is arranged close to the probe head of the probe rod.

5. The method of claim 2, wherein the array of fiber optic sensors is configured to measure the energy dissipation of the dynamic penetration probe. The fiber sensor is a Bragg fiber grating sensor.

6. The method of claim 1, wherein the array of fiber optic sensors is configured to measure the energy dissipation of the dynamic penetration test. The probe parameters include a cross-sectional area at a sensor mounting on the probe and a modulus of elasticity , a density of the probe .

7. The method of claim 1, wherein the array of fiber optic sensors is a fiber optic distributed acoustic sensor (DAS) array. determining the segmental energy loss amount between two sensors according to the measured values of force and speed at the corresponding positions of the sensors located downstream and the determined theoretical values of force and speed at the corresponding positions, and calculating the overall energy loss amount of the probe rod according to the segmental energy loss amount is specifically: acquiring a strain signal at a downstream sensor and separating it into downstream down-going waves using a Fourier transform and upstream down-going waves and obtaining measured values of force and velocity at the downstream sensor through a constitutive relationship and : wherein, is a downstream downwave; is a downstream upwave; the difference between the theoretical power value of the downstream sensor and the measured power value is taken to calculate the energy loss amount between the upstream sensor and the downstream sensor: all segmental energy loss amounts of the fiber sensor array are added to obtain the overall energy loss amount of the probe rod: 。 8. The method of power penetrometer energy dissipation quantification of claim 1, wherein, after the energy dissipation calculation step, the method further comprises: Rod length adaptive correction, fitting energy dissipation Decay function with rod length L , Establish rod length correction coefficient adaptive to different rod lengths: , Where, Total energy of hammering.

9. Use of a method for quantifying the energy dissipated by a dynamic penetration based on an array of optical fiber sensors, characterized in that, establishing an energy dissipation model according to the method of claim 8, and inversely calculating the dynamic penetration resistance of the soil body by combining the sounding data with the energy dissipation model: wherein is the penetration depth, is the rod length correction factor.

Images