CN-121992760-A - Dynamic penetration test device and method based on effective penetration energy

CN121992760ACN 121992760 ACN121992760 ACN 121992760ACN-121992760-A

Abstract

The invention provides a dynamic sounding test device and a method based on effective penetration energy, which relate to geotechnical engineering investigation, wherein the device comprises: the device comprises a bracket, a displacement sensor, a guide rod, a penetrating hammer, a hammer seat, a probe rod, a pipe wrench, a cable, a processor, an energy collection connector and the like, wherein a strain and acceleration sensor is arranged in the energy collection connector and used for collecting the strain and acceleration fed back by the penetration probe penetrating into a soil body, and the effective penetration energy of the penetration probe in the hammering process is calculated based on the data. The method has the advantages that effective penetration energy in the progressive hammering process is accurately obtained, fine division of stratum structures is facilitated, the hole depth, side friction resistance and absorption and dissipation of hammering energy by drill rod vibration are removed from measured data, the method is not limited by penetration depth in industry specifications, proper hammer weight and drop distance can be flexibly selected according to actual testing depth, the degree of automation is high, automatic data collection and processing can be achieved, and manual errors are effectively avoided.

Inventors

ZHU GUOJIN
NING YU
ZHANG HUAWEI
JIANG JIWEI
WANG HANWU
WANG TIANCHENG
HU SHENGGANG
REN JIALI
GUO PENGJIE

Assignees

中国电建集团昆明勘测设计研究院有限公司
长江水利委员会长江科学院

Dates

Publication Date: 20260508
Application Date: 20260121

Claims (9)

1. A dynamic penetration test device based on effective penetration energy, comprising: the bracket can be erected on the soil body; The guide rod can be vertically and movably hung on the support, a hammer seat is sleeved on the guide rod, and a displacement sensor for collecting the displacement of the guide rod is arranged on the support; the through hammer is sleeved on the guide rod in a sliding way and is positioned above the hammer seat; the upper end of the probe rod is detachably connected with the lower end of the guide rod, and the hammer seat is propped against the upper end of the probe rod; and the upper end of the energy collection joint is connected with the lower end of the probe rod, the lower end of the energy collection joint is connected with the sounding probe, a strain sensor and an acceleration sensor are arranged in the energy collection joint, and the strain sensor and the acceleration sensor are used for collecting the strain and the acceleration fed back in the process that the sounding probe penetrates into the soil body so as to calculate the effective penetration energy of each hammering process.
2. The dynamic penetration test device of claim 1, wherein the energy harvesting joint comprises a housing having an inner cavity, the strain sensor and the acceleration sensor are disposed within the inner cavity, and the strain sensor is disposed axially along the probe rod.
3. The dynamic sounding testing apparatus based on effective penetrating energy of claim 2, wherein the upper end and the lower end of the outer shell are respectively connected with the probe rod and the sounding probe through threads.
4. The dynamic touch detection testing device based on effective penetration energy of claim 1, wherein the displacement sensor is a pull-wire type displacement meter, the pull-wire type displacement meter is hung on the support, the pull-wire type displacement meter is provided with a displacement steel wire and a pull ring, the displacement steel wire is connected with the pull ring, and the pull ring is connected with the upper end of the guide rod.
5. The dynamic penetration test device according to claim 1, further comprising a pipe wrench, wherein the pipe wrench is provided with a bayonet for lowering the probe rod and the energy collection joint.
6. The dynamic touch test device based on effective penetration energy of claim 1, further comprising a processor, wherein the processor is connected to the strain sensor and the acceleration sensor via a first cable and to the displacement sensor via a second cable.
7. The dynamic touch test device based on effective penetration energy of claim 6, wherein the first cable surface is provided with length scale marks.
8. A dynamic sounding test method based on effective penetration energy is characterized in that the dynamic sounding test device based on effective penetration energy is used according to any one of claims 1-7, and comprises the following steps: s1, drilling in soil to a preset test position through a drilling machine, and arranging the bracket at the preset test position; s2, lowering the probe rod and the energy collection joint to enable the feeler probe to be at a preset distance above a test position; S3, arranging the guide rod above the probe rod, wherein the upper end of the probe rod is detachably connected with the lower end of the guide rod, the hammer seat is propped against the upper end of the probe rod, and a displacement sensor for collecting the displacement of the guide rod is arranged on the bracket; s4, lifting the penetrating hammer to a preset height along the guide rod, then freely releasing the penetrating hammer, hammering the hammer seat by the penetrating hammer, and driving the penetration probe, the energy collection connector and the probe rod to penetrate into soil downwards; S5, repeating the step S4 for a plurality of times, firstly enabling the penetration probe to penetrate downwards for the preset distance, and then penetrating into the probe for the required distance; S6, acquiring the strain acquired by the strain sensor and the acceleration acquired by the acceleration sensor when the through hammer hammers each time, and acquiring the effective penetration energy of the probe penetrating into the soil body in the successive hammering process according to the strain and the acceleration integral, wherein the effective penetration energy is as follows ; Where f=k epsilon, epsilon is the strain, k is the proportionality coefficient, a is the acceleration, and t is the time.
9. The method for dynamic touch testing based on effective penetration energy of claim 8, wherein said step S4 uses an automatic unhooking method to lift and release said perforating hammer.

Description

Dynamic penetration test device and method based on effective penetration energy Technical Field The invention relates to the technical field of geotechnical engineering investigation equipment, in particular to a dynamic sounding test device and method based on effective penetration energy. Background As one of the common in-situ test means in geotechnical engineering investigation, the traditional dynamic sounding test utilizes a drop hammer with a certain mass (such as 63.5 kg), freely drops with a certain height (such as 76 cm), drives a probe with a certain shape and size into a soil body, records the required hammering number for penetrating into a certain depth (such as 30 cm), judges the stratum change condition according to the hammering number, and estimates the physical and mechanical characteristics and parameters of the stratum soil body according to an empirical relationship. The power hammering type touch test belongs to an empirical test means, the maximum test depth which can be used for reference is limited by a rod length experience correction coefficient at present and is generally not more than 20m, more problems exist for relatively complex rock-soil bodies (such as sand gravel), the power hammering type touch test is mainly characterized in that (1) the energy of the power touch test is mainly determined through hammer weight, drop distance and hammering times, but with the increase of the test depth, the energy dissipation generated in the transmission of the connecting rod, the energy dissipation generated by friction of the side wall of the connecting rod, the energy dissipation generated by pore water pressure and the like have great influence on the accuracy of test results, after the test depth is reached, the conventional standard correction method for the effective energy transfer coefficient cannot meet the test requirement, and (2) particles with larger size are sometimes existed in sand gravel stratum, during the test, the particles need to be crushed, but the energy consumed during the crushing process cannot truly reflect the state of the soil bodies, the test results are easy to generate larger deviation, the automation degree is lower, automatic feedback and real-time recording cannot be realized, and certain measurement errors exist. Disclosure of Invention In view of the above, in order to solve the above problems in the current dynamic penetration test, the embodiments of the present invention provide a dynamic penetration test device and method based on effective penetration energy. The embodiment of the invention provides a dynamic sounding testing device based on effective penetration energy, which comprises: the bracket can be erected on the soil body; The guide rod can be vertically and movably hung on the support, a hammer seat is sleeved on the guide rod, and a displacement sensor for collecting the displacement of the guide rod is arranged on the support; the through hammer is sleeved on the guide rod in a sliding way and is positioned above the hammer seat; the upper end of the probe rod is detachably connected with the lower end of the guide rod, and the hammer seat is propped against the upper end of the probe rod; and the upper end of the energy collection joint is connected with the lower end of the probe rod, the lower end of the energy collection joint is connected with the sounding probe, a strain sensor and an acceleration sensor are arranged in the energy collection joint, and the strain sensor and the acceleration sensor are used for collecting the strain and the acceleration fed back in the process that the sounding probe penetrates into the soil body so as to calculate the effective penetration energy of each hammering process. Further, the energy harvesting joint comprises a housing having an inner cavity, the strain sensor and the acceleration sensor are disposed within the inner cavity, and the strain sensor is disposed axially along the probe rod. Further, the upper end and the lower end of the shell are respectively connected with the probe rod and the touch probe through threads. Further, the displacement sensor is a stay wire type displacement meter, the stay wire type displacement meter is hung on the support, the stay wire type displacement meter is provided with a displacement steel wire and a pull ring, the displacement steel wire is connected with the pull ring, and the pull ring is connected with the upper end of the guide rod. Further, the pipe wrench is provided with a bayonet, and the bayonet is used for lowering the probe rod and the energy collection joint. Further, the sensor further comprises a processor, wherein the processor is connected with the strain sensor and the acceleration sensor through a first cable, and is connected with the displacement sensor through a second cable. Further, the first cable surface is provided with length scale marks. In addition, the embodiment of the invention also provides a dynamic sounding