A method for rapid diagnosis of formation structure

Abstract

The application discloses a stratum structure rapid diagnosis method, which comprises the following steps: placing vibration sensors on pile point positions in a measurement area, and recording position information of each vibration sensor; drilling a blasting hole at a lowest point position of the measurement area, estimating soil layer thickness through a blasting hole drilling result, determining explosion shock wave propagation speed in a soil layer sample and in a rock sample through a sample measured by the blasting hole drilling; setting a hole depth of the blasting hole to be more than 10 times of the soil layer thickness; putting explosives into the bottom of the blasting hole, and triggering the explosives to explode in the hole; recording time from detonation to receiving the explosion shock wave by each sensor; and calculating soil layer depth at the position of the vibration sensor according to height difference between the vibration sensor and the blasting hole, distance between the vibration sensor and the position of the explosive explosion, and time of receiving the explosion shock wave by each vibration sensor. The method can solve the problems of high personnel requirement and low efficiency of large-batch drilling in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to a stratum structure rapid diagnosis method, belonging to the technical field of stratum structure measurement. BACKGROUND

[0002] When a pile foundation is punched, the thickness of the soil layer at the punched position needs to be determined first, because the hole depth needs to be determined according to the thickness of the soil layer, for example, if the soil layer is thin and the rock is below the soil layer, the foundation is relatively solid, and the hole needs to be punched shallowly; if the soil layer is thick and the soil is below the soil layer, the foundation is relatively soft, and the hole needs to be punched deeply. However, the surface is often covered by the soil layer, and the thickness of the soil layer below the surface cannot be determined. The existing method is mainly:

[0003] When a pile foundation is punched, the thickness of the soil layer at the punched position needs to be determined first, because the hole depth needs to be determined according to the thickness of the soil layer, for example, if the soil layer is thin and the rock is below the soil layer, the foundation is relatively solid, and the hole needs to be punched shallowly; if the soil layer is thick and the soil is below the soil layer, the foundation is relatively soft, and the hole needs to be punched deeply. However, the surface is often covered by the soil layer, and the thickness of the soil layer below the surface cannot be determined. The existing method is mainly: SUMMARY

[0004] The technical problem to be solved by the present application is to provide a stratum structure rapid diagnosis method to overcome the shortcomings of the prior art.

[0005] The technical scheme of the present application is a stratum structure rapid diagnosis method, which comprises the following steps:

[0006] Placing a vibration sensor on a hole pile point in a measurement area, and recording the position information of each vibration sensor;

[0007] Drilling a blasting hole at the lowest point of the measurement area, estimating the thickness of the soil layer through the blasting hole drilling result, and determining the propagation speed v2 of the explosion shock wave in the soil sample and the propagation speed v1 in the rock sample through the blasting hole drilling sample;

[0008] The hole depth D of the blasting hole is set to more than 10 times the thickness of the soil layer;

[0009] Putting explosives into the bottom of the blasting hole and triggering the explosion of the explosives in the hole;

[0010] Recording the time T from detonation to the receipt of the explosion shock wave by each sensor;

[0011] According to the height difference H between the vibration sensor and the blasting hole, the distance L between the vibration sensor and the explosion position, and the time of receipt of the explosion shock wave by each vibration sensor, the soil depth h at the position of the vibration sensor is calculated.

[0012] Specifically, the soil depth h at the position of the vibration sensor is calculated by the following method:

[0013] h=c2cosθ2

[0014] Where c2 represents the distance between the refraction point of the explosion shock wave at the rock-soil interface and the corresponding vibration sensor, and θ2 is the angle between the line connecting the refraction point of the explosion shock wave at the rock-soil interface and the vibration sensor and the normal.

[0015] c2 and θ2 can be solved using the following equations:

[0016]

[0017] Where c1 represents the distance between the refraction point of the blast shock wave at the rock-soil interface and the explosion point, and θ1 is the angle between the line connecting the refraction point of the blast shock wave at the rock-soil interface and the explosion point and the normal.

[0018] Furthermore, it also includes:

[0019] Based on the soil depth and the location of each vibration sensor, the soil depth measurement results are visualized on a map.

[0020] The beneficial effects of this invention are as follows: Compared with the prior art, this invention determines the soil layer thickness by drilling a hole at the lowest point of the measurement area and placing explosives in the hole, detonating the explosives to generate a shock wave, and using a vibration sensor to detect the shock wave. The difference in propagation speed of the shock wave in rock and in soil layers is utilized to determine the soil layer thickness. The measurement process only requires drilling one hole, and the soil layer thickness of all pile points within the shock wave coverage area can be quickly measured in one operation, making it particularly suitable for rapid measurement of a large number of points. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of soil layer thickness measurement according to an embodiment of the present invention. Detailed Implementation

[0022] Example 1:

[0023] Suppose we have as Figure 1 The measurement is performed in one of the measurement areas shown.

[0024] First, we placed vibration sensors at the borehole locations within the measurement area and recorded the location information of each sensor. Next, we drilled a blast hole at the lowest point of the measurement area and estimated the soil layer thickness by measuring the samples obtained from the blast hole. Through these measurements, we obtained the propagation velocity v2 of the blast shock wave in the soil sample and v1 of the rock sample.

[0025] Next, we set the hole depth D to be more than 10 times the soil layer thickness. Then, we placed explosives at the bottom of the hole and triggered the explosion inside the borehole. We recorded the time T from detonation to each sensor receiving the blast shock wave.

[0026] Finally, based on the height difference H between each vibration sensor and the blast hole, the distance L between the vibration sensor and the explosion location, and the time T for each vibration sensor to receive the explosion shock wave, we calculated the soil depth h at the location of each vibration sensor.

[0027] To calculate the soil depth at the location of the vibration sensor, the following method is used:

[0028] h=c2 cosθ2

[0029] Where c2 represents the distance between the refraction point of the explosion shock wave at the rock-soil interface and the corresponding vibration sensor, and θ2 is the angle between the line connecting the refraction point of the explosion shock wave at the rock-soil interface and the vibration sensor and the normal.

[0030] c2 and θ2 can be solved using the following equations:

[0031]

[0032] Where c1 represents the distance between the refraction point of the blast shock wave at the rock-soil interface and the explosion point, and θ1 is the angle between the line connecting the refraction point of the blast shock wave at the rock-soil interface and the explosion point and the normal.

[0033] In addition, to visualize the measurement results, the soil depth measurement results can be visualized on a map based on the soil depth and the location of each vibration sensor.

[0034] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for rapid diagnosis of stratigraphic structure, characterized in that, The method includes the following steps: Vibration sensors were placed at the borehole locations within the measurement area, and the location information of each vibration sensor was recorded. Drill blast holes at the lowest point of the measurement area, estimate the soil layer thickness based on the blast hole drilling results, and determine the propagation velocity v2 of the blast shock wave in the soil sample and the propagation velocity v1 in the rock sample based on the samples drilled from the blast holes. Set the hole depth D of the blasting hole to be more than 10 times the thickness of the soil layer; Explosives are placed at the bottom of the blast hole, and the explosives are detonated inside the hole. Record the time T from detonation to each sensor receiving the blast shock wave; The soil depth h at the location of the vibration sensor is calculated based on the height difference H between the vibration sensor and the blast hole, the distance L between the vibration sensor and the explosion location of the explosive, and the time it takes for each vibration sensor to receive the explosion shock wave. The soil depth h at the location of the vibration sensor is calculated using the following method: h=c2 cosθ2 Where c2 represents the distance between the point where the blast shock wave refracts at the rock-soil interface and the corresponding vibration sensor. θ2 is the angle between the line connecting the refraction point of the explosion shock wave at the rock-soil interface and the vibration sensor and the normal. c2 and θ2 can be solved using the following equations: Where c1 represents the distance between the refraction point of the blast shock wave at the rock-soil interface and the explosion point, and θ1 is the angle between the line connecting the refraction point of the blast shock wave at the rock-soil interface and the explosion point and the normal.

2. The rapid diagnostic method for stratigraphic structure according to claim 1, characterized in that, Also includes: Based on the soil depth and the location of each vibration sensor, the soil depth measurement results are visualized on a map.

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