CN109458967B - Depth detection method for sludge soft soil dynamic compaction replacement pile - Google Patents

Depth detection method for sludge soft soil dynamic compaction replacement pile Download PDF

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Publication number
CN109458967B
CN109458967B CN201811255865.7A CN201811255865A CN109458967B CN 109458967 B CN109458967 B CN 109458967B CN 201811255865 A CN201811255865 A CN 201811255865A CN 109458967 B CN109458967 B CN 109458967B
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coordinate
point
dynamic compaction
depth
tamping
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CN109458967A (en
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张晓春
王哲
陈澍洋
陈启夫
王春雷
毛华荣
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Taizhou City Traffic Survey And Design Institute
Southeast University
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Taizhou City Traffic Survey And Design Institute
Southeast University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups
    • G01B21/18Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups for measuring depth
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V9/00Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00

Abstract

The invention relates to a depth detection method for a silt soft soil dynamic compaction replacement pile, and belongs to the technical field of constructional engineering. The method for detecting the depth of the sludge soft soil dynamic compaction replacement pile comprises the following steps: dividing a dynamic compaction replacement site into a plurality of blocks according to compaction points, wherein each block is square; respectively setting control points at four vertex angles of the square block; preparing a plurality of stones with surfaces coated with metallic paint; placing stones sprayed with metallic paint at tamping points according to the blocks divided in the step 1); after the placement is finished, laying a filler above the stone blocks, and performing point tamping; modeling the side measurement data, etc. The depth detection method of the dynamic compaction replacement pile for the muddy soft soil is based on metal detection measurement of the depth of dynamic compaction replacement under the muddy soft soil condition, and due to the characteristics that the muddy soft soil has small strength, soil is soft and weak, the dynamic compaction replacement pile is easy to be irregular in shape and difficult to control the depth, the metal detection sensitivity is high, the underground metal position is accurately determined, and the depth of the dynamic compaction replacement pile is detected.

Description

Depth detection method for sludge soft soil dynamic compaction replacement pile
Technical Field
The invention relates to a depth detection method for a silt soft soil dynamic compaction replacement pile, and belongs to the technical field of constructional engineering.
Background
The strong tamping replacement method is to force the broken stone, the rock block, the slag and other coarse particles with better physical and mechanical properties into the natural foundation by utilizing the larger impact energy of the rammer, and finally achieve the aim of reinforcing the foundation by forming a pile-soil composite foundation through replacement. However, when the dynamic compaction replacement method is adopted in soft foundations such as lakeside marine soft soil, the soft layer is extruded due to the fact that the soil is too soft, and it is difficult to judge the position of the replacement pile in the ground and the shape of the compacted pile in the ground. It is difficult to measure it accurately by the existing methods. The depth and the pile diameter of the rammed pier formed by dynamic ramming are important design parameters of the engineering and important basis for evaluating the engineering completion quality. The spatial form of the ramming pile in the soft soil layer is also an important direction for research.
Disclosure of Invention
The invention provides a depth detection method for a silt soft soil dynamic compaction replacement pile aiming at the defects.
The invention adopts the following technical scheme:
the invention relates to a depth detection method for a sludge soft soil dynamic compaction replacement pile, which comprises the following steps:
1) dividing the dynamic compaction replacement site into a plurality of blocks according to the compaction points, wherein each block is square; respectively setting control points at four vertex angles of the square block;
2) preparing a plurality of stone blocks with the surfaces sprayed with metallic paint; placing stones sprayed with metallic paint at tamping points according to the blocks divided in the step 1);
3) after the placement is finished, laying a filler above the stone block, and performing point tamping;
4) adopting a control point to measure the distance of the sprayed metal paint stone blocks in each divided area, and taking 0 as a coordinate originRespectively establishing point coordinates Aij(Xij,Yij,Zij) Point coordinate Ai+1,j(Xi+1,j,Yi+1,j,Zi+1,j) Point coordinate Ai,j+1(Xi,j+1,Yi,j+1,Zi,j+1) (ii) a Establishing a right triangle by using three coordinate points;
are respectively expressed as Aij,Ai+1,j,Ai,j+1Taking the coordinate point as a center, establishing a spherical coordinate system as follows:
Aijthe detection angle is more than or equal to 0 and less than or equal to 90 DEG in the coordinate system;
Ai+1,jIn the coordinate system, the detection angle theta is more than or equal to 90 degrees and less than or equal to 180 degrees;
Ai,j+1in the coordinate system, the detection angle theta is more than or equal to 270 degrees and less than or equal to 360 degrees;
5) calculating a coordinate point A by the following expressionij(Xij,Yij,Zij) Angle theta in spherical coordinate system1Angle of rotationAnd a distance r1
And will make an angle theta1Angle of rotationAnd a distance r1Obtaining a coordinate point A through the following formula public calculationij(Xij,Yij,Zij) The value of (d);
6) calculating a coordinate point A by the following expressioni+1,j(Xi+1,j,Yi+1,j,Zi+1,j) Angle theta in spherical coordinate system2Angle of andand a distance r2
And will make an angle theta2Angle of andand a distance r2Obtaining a coordinate point A through the following formula public calculationi+1,j(Xi+1,j,Yi+1,j,Zi+1,j) The value of (d);
7) calculating a coordinate point A by the following expressioni,j+1(Xi,j+1,Yi,j+1,Zi,j+1) Angle theta in spherical coordinate system3Angle, angleAnd a distance r3
And will make an angle theta3Angle, angleAnd a distance r3Obtaining a coordinate point A through the following formula public calculationi,j+1(Xi,j+1,Yi,j+1,Zi,j+1) The value of (d);
8) and importing the triangular coordinate point data obtained in the step 5), the step 6) and the step 7) into image processing CAD software to form a 3d view, so as to obtain the depth of the dynamic compaction replacement filler and the space form of the replacement pile in the soft soil layer.
According to the depth detection method of the sludge soft soil dynamic compaction replacement pile, the broken stone with the thickness of 20-30cm is paved as the filler in the step 3).
The method for detecting the depth of the sludge soft soil dynamic compaction replacement pile comprises the step 3) of point compaction on a compaction point to form a compaction hole, and tamping the compaction hole, wherein the tamping is stopped after the tamping depth is more than 10 cm.
According to the depth detection method for the sludge soft soil dynamic compaction replacement pile, after point compaction is completed, the whole dynamic compaction replacement field is uniformly tamped for 2-3 times, and the tamping position is guaranteed to be overlapped by one quarter.
Advantageous effects
The depth detection method of the dynamic compaction replacement pile for the muddy soft soil is based on metal detection measurement of the depth of dynamic compaction replacement under the muddy soft soil condition, and due to the characteristics that the muddy soft soil has small strength, soil is soft and weak, the dynamic compaction replacement pile is easy to be irregular in shape and difficult to control the depth, the metal detection sensitivity is high, the underground metal position is accurately determined, and the depth of the dynamic compaction replacement pile is detected.
The depth detection method for the dynamic compaction replacement pile of the silt soft soil is used for measuring the depth of dynamic compaction replacement under the condition of the silt soft soil based on a metal detection method, the stone blocks sprayed with the metallic paint are adopted, the raw materials are convenient and easy to obtain, the sprayed stone blocks are scattered on the field, the operation is simple, and the efficiency is high, and the cost is low.
The depth detection method of the dynamic compaction replacement pile for the muddy soft soil is based on a metal detection method, the depth of dynamic compaction replacement under the muddy soft soil condition is measured, the underground metal position is accurately determined due to the high metal detection sensitivity, and the spatial form of the dynamic compaction replacement pile in the underground can be detected by driving a certain amount of painted stones.
The method adopts a method of dividing blocks and selecting control points, and has clear structure and convenient operation. The data of each control point is directly imported into a computer algorithm for processing to form a 3d image. And processing to obtain the dynamic compaction replacement depth. The operation is simple, and the result is clear at a glance.
Drawings
FIG. 1 is a schematic diagram of the final imaging of the present invention calculated and imported graphics software;
FIG. 2 is a schematic diagram of the field device arrangement of the present invention;
fig. 3 is a schematic view of the spherical coordinates of the present invention.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in the figure: a depth detection method for a sludge soft soil dynamic compaction replacement pile comprises the following steps:
1) dividing the dynamic compaction replacement site into a plurality of blocks according to the compaction points, wherein each block is square; respectively setting control points at four vertex angles of the square block;
2) preparing a plurality of stone blocks with the surfaces sprayed with metallic paint; placing stones sprayed with metallic paint at tamping points according to the blocks divided in the step 1);
3) after the placement is finished, laying a filler above the stone block, and performing point tamping;
4) carrying out distance control on the metal paint stone blocks sprayed in each divided area by adopting a control point;
first, point 0 is selected as the origin of coordinates, point coordinate Aij(Xij,Yij,Zij) And point coordinates ai+1,j(Xi+1,j,Yi+1,j,Zi+1,j) Point coordinate Ai,j+1(Xi,j+1,Yi,j+1,Zi,j+1) Forming a right triangle, ensuring the distance between the control points to be a, locking the detection range of the two control points in a rectangle taking the two control points as vertexes, and taking the rectangle as a control to detect downwards as shown in a second graph. This process requires the following algorithm to be implemented:
are respectively expressed as Aij,Ai+1,j,Ai,j+1Taking the point as the center, establishing a spherical coordinate system as shown in figure three,
Aijthe detection angle theta is more than or equal to 0 and less than or equal to 90 degrees in the coordinate system,
Ai+1,jin the coordinate system, the detection angle theta is more than or equal to 90 degrees and less than or equal to 180 degrees,
Ai,j+1in the coordinate system, the detection angle theta is more than or equal to 270 degrees and less than or equal to 360 degrees.
At the point Aij(Xij,Yij,Zij) In a centered spherical coordinate system, the boundary conditions of the detection are first determined from the theta of the detection angle1Andand a distance r1Three parameters make up:
and only the metal blocks in the range are subjected to data processing conversion.
Theta of detection angle of all metal blocks in the area can be obtained1Andand a distance r1
Then orderApproximate rectangular coordinate system coordinates of these metal blocks can be obtained.
Recalculated with Ai+1,j(Xi+1,j,Yi+1,j,Zi+1,j) A centered spherical coordinate system, by first determining the boundary conditions of the detection, from the theta of the detection angle2Andand a distance r2Three parameters make up:
and carrying out data processing conversion on the metal blocks in the range. Theta of detection angle of all metal blocks in the area can be obtained2Andand a distance r2
Then orderApproximate rectangular coordinate system coordinates of these metal blocks can be obtained.
Recalculated with Ai,j+1(Xi,j+1,Yi,j+1,Zi,j+1) A centered spherical coordinate system, by first determining the boundary conditions of the detection, from the theta of the detection angle3Andand a distance r3Three parameters make up:
and carrying out data processing conversion on the metal blocks in the range.
Theta of detection angle of all metal blocks in the area can be obtained3Andand a distance r3
Then orderApproximate rectangular coordinate system coordinates of these metal blocks can be obtained.
The corresponding error range of the three observation points for the metal blocks through the preliminary error coordinates is 0.3 m, the coordinates of the metal blocks detected by different detection points are determined to be the same metal block in the range, and each metal block in the area is locked.
The metal blocks in the area are marked with the rule that the metal blocks are close to AijThe distances of the observation points are sequentially marked on the metal blocks. And the three control points start to carry out accurate position calculation after carrying out identification marks on the metal blocks in the area.
Each control point and two adjacent control points can form a right triangle, one corner of the dynamic compaction replacement field is used as an origin of coordinates, and coordinates A of all the control points are knownij(Xij,Yij,Zij) And point Ai+1,j(Xi+1,j,Yi+1,j,Zi+1,j),Ai,j+1(Xi,j+1,Yi,j+1,Zi,j+1)。
The distance between the control points is known to be the same as n.
The vegetable paint spraying stone block D can be obtained by metal detectioniAnd three control points Aij,Ai+1,j,Ai,j+1A distance ofi,bi,ci. From DiDot line segment DiEiVertical line segment AijAi,j+1Drop foot EiOn line segment AijAi,j+1The above. From triangle AijAi+1,jDiThe area formula column equation system of DiEiLength hThe value of (c).
From DiDot line segment DiFiVertical line segment AijAi,j+1Drop foot FiOn line segment AijAi,j+1The above. From triangle AijAi,j+1DiThe area formula column equation system of DiFiLength hFThe value of (c).
Drawing a line segment DiGiVertical plane AijAi+1,jAi,j+1,GiPoint on the surface AijAi+1,jAi,j+1The above.
Calculating the perpendicular DiGiLength of
Calculating DiAnd Ai+1,iDistance A of points along the x-axisi+1,jFi 2=bi 2-DiFi 2
Can obtain DiPoint coordinate Di(bxi+Ai+1,jFi,byi+Ai+1,jEi,bzi-DiGi)
And obtaining the positions of other painted stones in the same way, and inputting the coordinates of the other painted stones into the coordinate system to obtain the spatial form of the replacement pile.
The first embodiment is as follows:
according to the above model building method, the actual calculation is now performed using a rammer weighing 22t and having a diameter of 1.5 meters:
the 4 corners of each block are the control points measured with sensors after tamping is complete.
Preparing enough metallic paint-sprayed metal balls
The metal balls are placed on the tamping points and then a gravel pack is laid on top.
And (3) point-ramming the ramming point, and stopping ramming after the ramming point is rammed to a certain depth (close to the top of the rammer) to form a ramming hole. And (4) continuously tamping after the tamping pits are supplemented with fillers, and stopping tamping after the depth of the tamping hammer of each broken stone pier is less than 10 cm.
After the dynamic compaction is finished, the metal balls in the block are detected by using the detectors at four control points at four corners of the compacted point block, and after preliminary treatment, the metal balls are subjected to preliminary treatment
The distances from the metal ball D to the control point ABC were found to be 5, 5.1, and 5.5, respectively.
And (3) processing the data by adopting an algorithm: the 0 point at the top of the dynamic compaction field is taken as the origin (0, 0, 0), and A is knownij,Ai+1,j,Ai,j+1Coordinate Aij(4,6,0,),Ai+1,j(4,4,0),Ai,j+1(6,4,0). The distance between the control points is 2.
From DiDot line segment DiEiPerpendicular Aij,Ai+1,jDrop foot EiOn line segment Aij,Ai+1,jThe above. From triangle AijAi+1,jDiThe area formula column equation system of DiEiLength hEThe value of (c).
From DiDot line segment DiFiPerpendicular Aij,Ai,j+1Drop foot FiOn line segment Aij,Ai,j+1The above. From triangle AijAi,j+1DiThe area formula column equation system of DiFiLength hFThe value of (c).
Drawing a line segment DiGiVertical plane AijAi+1,jAi,j+1,GiPoint on the surface AijAi+1,jAi,j+1The above.
Calculating the perpendicular DiGiLength of
DiAnd Ai+1,jDistance A of points along the x-axisi+1,jFi 2=bi 2-DiFi 2=5.12-4.8722.29 obtaining DiPoint coordinate Di
(bxi+Ai+1,jFi,byi+Ai+1,jEi,bzi-DiGi)=(5.51,5.25,-4.71)
And obtaining the positions of other painted stones in the same way, and inputting the coordinates of the other painted stones into the coordinate system to obtain the spatial form of the replacement pile.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (4)

1. A depth detection method for a silt soft soil dynamic compaction replacement pile is characterized by comprising the following steps: the detection method comprises the following steps:
1) dividing the dynamic compaction replacement site into a plurality of blocks according to the compaction points, wherein each block is square; respectively setting control points at four vertex angles of the square block;
2) preparing a plurality of stone blocks with the surfaces sprayed with metallic paint; placing stones sprayed with metallic paint at tamping points according to the blocks divided in the step 1);
3) after the placement is finished, laying a filler above the stone block, and performing point tamping;
4) adopting a control point to measure the distance of the metal paint stone blocks sprayed in each divided area, and respectively establishing point coordinates A by taking O as the origin of coordinatesij(Xij,Yij,Zij) Point coordinate Ai+1,j(Xi+1,j,Yi+1,j,Zi+1,j) Point coordinate Ai,j+1(Xi,j+1,Yi,j+1,Zi,j+1) (ii) a Establishing a right triangle by using three coordinate points;
are respectively expressed as Aij,Ai+1,j,Ai,j+1Taking the coordinate point as a center, establishing a spherical coordinate system as follows:
Aijin the coordinate system, the detection angle theta is more than or equal to 0 and less than or equal to 90 degrees;
Ai+1,jin the coordinate system, the detection angle theta is more than or equal to 90 degrees and less than or equal to 180 degrees;
Ai,j+1in the coordinate system, the detection angle theta is more than or equal to 270 degrees and less than or equal to 360 degrees;
5) calculating a coordinate point A by the following expressionij(Xij,Yij,Zij) Angle theta in spherical coordinate system1Angle of rotationAnd a distance r1
And will make an angle theta1Angle of rotationAnd a distance r1Obtaining a coordinate point A through the following formula public calculationij(Xij,Yij,Zij) The value of (d);
6) calculating a coordinate point A by the following expressioni+1,j(Xi+1,j,Yi+1,j,Zi+1,j) Angle theta in spherical coordinate system2Angle of andand a distance r2
And will make an angle theta2Angle of andand a distance r2Obtaining a coordinate point A through the following formula public calculationi+1,j(Xi+1,j,Yi+1,j,Zi+1,j) The value of (d);
7) calculating a coordinate point A by the following expressioni,j+1(Xi,j+1,Yi,j+1,Zi,j+1) Angle theta in spherical coordinate system3Angle, angleAnd a distance r3
And will make an angle theta3Angle, angleAnd a distance r3Obtaining a coordinate point A through the following formula public calculationi,j+1(Xi,j+1,Yi,j+1,Zi,j+1) The value of (d);
8) and importing the triangular coordinate point data obtained in the step 5), the step 6) and the step 7) into image processing software to form a 3d view, so as to obtain the depth of the dynamic compaction replacement filler and the space form of the replacement pile in the soft soil layer.
2. The method for detecting the depth of the sludge soft soil dynamic compaction replacement pile according to claim 1, which is characterized by comprising the following steps of: and paving 20-30cm thick macadam as the filler in the step 3).
3. The method for detecting the depth of the sludge soft soil dynamic compaction replacement pile according to claim 1, which is characterized in that; and 3) point tamping is carried out on the tamping points to form tamping holes, the tamping holes are tamped, and tamping is stopped after the tamping depth is more than 10 cm.
4. The method for detecting the depth of the sludge soft soil dynamic compaction replacement pile according to claim 3, which is characterized by comprising the following steps of: and after the point tamping is finished, the whole dynamic compaction replacement field is tamped uniformly for 2-3 times, and the tamping position is ensured to be overlapped by one quarter.
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