Layered settlement measurement device and layered settlement measurement method

Abstract

To measure the settlement over time by stratum for a long period.SOLUTION: A settlement by layer measurement device 100 comprises: an observation data acquisition unit 110 that acquires observation data generated by observing, from the sky, changes over time of the vertical displacement of the surface of the ground and the vertical displacement of a structure built on the ground; a stratum data acquisition unit 120 that acquires stratum data of the strata composition of the ground in which a stratum supporting a leading end of the base of the structure is specified; and a derivation unit 130 that derives the settlement over time by stratum of the ground from the observation data and the stratum data.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a layer settlement measurement device and a method for measuring layer settlement amount.

Background Art

[0002] Patent Document 1 discloses a technique related to a measurement device for simultaneously measuring the layer settlement amount of an embankment and the groundwater level. This prior art measurement device consists of a plurality of measurement pipes and a connecting pipe for movably connecting these measurement pipes. A measurement ring is provided at a substantially central portion of the measurement pipe, a cross arm is fixed in the horizontal direction of this measurement ring, and a hole is formed in the pipe for connecting the measurement pipes.

[0003] Patent Document 2 discloses a technique related to a method for measuring the settlement state when constructing a landfill project and a sediment burial project on the seabed ground. In this prior art settlement measurement method, it includes at least two or more pressure gauges, a first communication pipe for communicating all the back pressure chambers of the pressure gauges, a second communication pipe for communicating all the pressure receiving chambers of the pressure gauges, and a pressurized liquid tank communicated with the second communication pipe. Then, only the liquid is filled in the pressurized liquid tank, the second communication pipe, and the pressure receiving chamber, and the pressurized liquid tank is provided with a flexible bellows-like structure.

[0004] Patent Document 3 discloses a technique related to a measurement method and a measurement device for measuring the settlement amount of the ground. In this prior art, an extensible settlement measurement pipe having marks at predetermined intervals inside is buried integrally with the ground in a hole drilled by boring or the like, and the marks inside the settlement measurement pipe are observed with an in-hole observation camera having a depth measurement function to measure the depth of each mark, and the settlement amount of the ground at the depth of each mark is obtained from the change over time of the depth of each mark.

[0005] Non-Patent Document 1 discloses the "Manual for Satellite Utilization in Ground Settlement Observation etc." compiled by the Ministry of the Environment. In this prior art, ground settlement is efficiently monitored by utilizing satellite data observed by artificial satellites.

[0006] Furthermore, other related technologies are disclosed in Non-Patent Documents 2 and 3. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 03-009217 [Patent Document 2] Japanese Patent Publication No. 2002-131094 [Patent Document 3] Japanese Patent Publication No. 2007-114079 [Non-patent literature]

[0008] [Non-Patent Document 1] Searched on April 3, 2022, Internet<https: / / www.env.go.jp / press / 104084.html> "Manual for the Use of Satellites in Ground Subsidence Observation, etc." [Non-Patent Document 2] Searched on April 1, 2022, Internet<https: / / sorabatake.jp / 3364 / > "The Basics of Synthetic Aperture Radar (SAR): Examples, What It Can Detect, Sensors, Satellites, Wavelengths" [Non-Patent Document 3] Searched on April 3, 2022, Internet<https: / / sorabatake.jp / 4343 / > "What is Interferometric Surveillance (InSAR)? - What it reveals, examples, mechanisms, and how to interpret it -" [Overview of the project] [Problems that the invention aims to solve]

[0009] Layered settlement gauges are sometimes used to measure the amount of settlement in different layers of the ground. However, layered settlement gauges require measurement personnel to periodically visit the site to measure the settlement. Therefore, conducting regular measurements over a long period, such as several decades or more, is difficult due to costs and handover issues.

[0010] On the other hand, ground subsidence observation using satellite data-based vertical displacement measurement techniques (interferometric SAR analysis) described in Non-Patent Documents 1, 2, and 3 can be performed over long periods. However, this vertical displacement measurement technique (interferometric SAR analysis) can only measure vertical displacement at the ground surface level in principle, and therefore cannot measure the amount of subsidence for each geological layer.

[0011] In view of the above facts, the present invention aims to measure the amount of subsidence over time for each geological layer. [Means for solving the problem]

[0012] The first embodiment is a layer-specific settlement measurement device comprising: an observation data acquisition unit that acquires observation data created by observing the time-dependent changes in the vertical displacement of the ground surface and the vertical displacement of a structure constructed on the ground from above; a geological layer data acquisition unit that acquires geological layer data of the geological structure of the ground in which the geological layer supporting the tip of the foundation of the structure is identified; and a derivation unit that derives the time-dependent settlement amount of each geological layer of the ground from the observation data and the geological layer data.

[0013] In the first embodiment of the layered settlement measurement device, the vertical displacement of a structure in the observation data is taken as the settlement of the layer supporting the foundation of the structure, and the time-series settlement of each layer is derived from the observation data and the layer data. The time-series changes in the vertical displacement of the ground surface and the vertical displacement of the structure, which are the observation data, are created by observing from above, so for example, there is no need for measurement personnel to periodically go to the site to measure the settlement. Therefore, the time-series settlement of each layer can be measured over a long period of time.

[0014] The second embodiment is a stratified settlement measurement device as described in the first embodiment, wherein the observation data is created by interferometric SAR analysis using a satellite.

[0015] In the second embodiment of the stratified settlement measurement device, observation data is created using interferometric SAR analysis with satellites, thus enabling the creation of high-precision observation data over a long period.

[0016] In a third aspect, the structure is an existing building, and the stratum data is the layer-by-layer settlement measurement device according to the first or second aspect created from the design drawings of the building.

[0017] In the layer-by-layer settlement measurement device of the third aspect, there is no need to newly construct a structure by using an existing building, or the number of newly constructed structures can be reduced. Further, since the stratum data is created from the design drawings of the building, the stratum data can be created without, for example, conducting a boring survey.

[0018] A fourth aspect is a method for measuring layer-by-layer settlement amount, comprising: an observation data acquisition step of acquiring observation data obtained by observing over time the vertical displacement amount of the ground surface of the ground and the vertical displacement amount of the structure constructed on the ground from above; a stratum data acquisition step of acquiring stratum data of the stratum configuration of the ground in which the stratum supporting the tip of the foundation of the structure is specified; and a derivation step of deriving the settlement amount over time for each stratum of the ground from the observation data and the stratum data.

[0019] In the method for measuring layer-by-layer settlement amount of the fourth aspect, by setting the vertical displacement amount of the structure as the settlement amount of the stratum supporting the foundation of the structure, the settlement amount over time for each stratum is derived from the observation data and the stratum data. The vertical displacement amount of the ground surface of the ground and the vertical displacement amount of the structure over time, which are the observation data, are observed from above, so there is no need for a surveyor to regularly measure the settlement amount on site. Therefore, the settlement amount over time for each stratum is measured over a long period.

Advantages of the Invention

[0020] According to the present invention, the settlement amount over time for each stratum can be measured over a long period.

Brief Description of the Drawings

[0021] [Figure 1] It is a configuration diagram of the configuration of a layer-by-layer settlement measurement system and the ground configuration of the ground. [Figure 2] It is a block diagram showing an example of the functional configuration of a layer-by-layer settlement measurement device. [Figure 3] This graph shows examples of settlement amounts for different geological layers. [Figure 4] In the numerical analysis, (A) is a diagram corresponding to Figure 1 showing the state before settlement, and (B) is a diagram corresponding to Figure 1 showing the state after settlement. [Figure 5] This graph corresponds to Figure 3, which shows the amount of settlement in the numerical analysis. [Figure 6] This is a flowchart for determining the amount of settlement and the change in layer thickness for each day. [Modes for carrying out the invention]

[0022] <Embodiment> A stratified settlement measurement device according to one embodiment of the present invention will be described.

[0023] [composition] The configuration of the stratified settlement measurement device of this embodiment will now be described.

[0024] Figure 1 shows the overall configuration of the layered settlement measurement system 10, which includes the layered settlement measurement device 100 of this embodiment. The layered settlement measurement system 10 is a system for measuring the amount of settlement over time in each geological layer of the ground 500.

[0025] The layered settlement measurement system 10 comprises a layered settlement measurement device 100, an artificial satellite 20, and a plurality of existing buildings 200, 210, 230 and a newly constructed structure 220 built on the ground 500.

[0026] The artificial satellite 20 in this embodiment is a synthetic aperture radar (SAR) satellite equipped with a synthetic aperture radar (SAR). Hereafter, "synthetic aperture radar" may be referred to as "SAR".

[0027] In this embodiment, the ground 500 has a geological structure 500K consisting of an embankment layer 510, a first clay layer 512, a first gravel layer 514, a second clay layer 516, and a second gravel layer 518, from the top down. The entire layer deeper than the second gravel layer 518 is referred to as the deep layer 520. Note that the geological structure 500K shown in Figure 1, etc., is just an example and is not limited thereto.

[0028] Existing buildings 200, 210, and 230 are office buildings, apartment buildings, and detached houses, etc., constructed on a ground level of 500. Furthermore, buildings 200, 210, and 230 may be of any construction type, such as reinforced concrete, steel-reinforced concrete, or wood.

[0029] For clarity, buildings 200, 210, and 230 are shown as rectangles of the same size as structure 220 (described later) in each diagram; however, in reality, they are of sizes and shapes appropriate to each individual building.

[0030] The leading edges of the foundations supporting buildings 200, 210, 230 and structure 220 (described later) are anchored to different geological layers. Specifically, the foundation of building 200 is a raft foundation 202 supported by embankment layer 510. The foundation of building 210 is a pile 212 whose leading edge 214 is supported by the lower part of embankment layer 510. The foundation of building 230 is a pile 232 whose leading edge 234 is supported by the second gravel layer 518.

[0031] The newly constructed structure 220 was built to measure the settlement of each geological layer of the ground 500. In this embodiment, the structure 220 is a one-meter-square cube made of reinforced concrete, but it is not limited to this. However, it must be of a size and location such that the radio waves from the artificial satellite 20 are not obstructed by surrounding buildings, etc. The foundation of the structure 220 is a pile 222 whose tip 224 is supported in the first gravel layer 514.

[0032] In this embodiment, the geological structure 500K of the ground 500 and the geological layers supporting the leading edges of the foundations of the buildings 200, 210, and 230 are determined from the design documents of the buildings 200, 210, and 230. The geological layer supporting the leading edge of the foundation of the structure 220, the first gravel layer 514 in this embodiment, is determined when driving the piles 222.

[0033] Furthermore, piles 212, 222, and 223 may be any type of pile, such as concrete piles, steel piles, and FRP poles.

[0034] Here, "design documents" refers to the documents necessary for constructing a building, and is a general term encompassing design drawings, specifications, and other documents. Design documents are stored in architectural firms, government agencies, etc.

[0035] The hardware configuration of the layered settlement measurement device 100 in the embodiment shown in Figure 1 consists of a computer including a CPU (Central Processing Unit) (not shown), a ROM (Read Only Memory) that stores programs for realizing each processing routine, a RAM (Random Access Memory) for temporarily storing data, memory as a storage means, and a network interface. The layered settlement measurement device 100 may also be configured to include multiple servers or cloud services.

[0036] The CPU is a central processing unit that executes various programs and controls various components. Specifically, the CPU reads programs from ROM and other storage devices, and executes them using RAM as a workspace. The CPU performs various calculations according to the programs stored in ROM and other storage devices.

[0037] As shown in Figure 2, the layered settlement measurement device 100 functionally comprises an observation data acquisition unit 110, a geological layer data acquisition unit 120, and a derivation unit 130. An analysis unit 30 is connected to the observation data acquisition unit 110, and the observation data acquisition unit 110 acquires observation data from this analysis unit 30. An input unit 122 is connected to the geological layer data acquisition unit 120, and the geological layer data acquisition unit 120 acquires geological layer data from the input unit 122.

[0038] "Observation data" refers to the initial state (start of observation) or the vertical displacement from the previous observation of the ground surface 502 of the ground 500, buildings 200, 210, 230, and structure 220, as shown in Figure 1. "Geological layer data" refers to the geological layer structure 500K, which identifies the geological layer supporting the foundations of buildings 200, 210, 230, and structure 220.

[0039] The analysis unit 30 receives satellite data from the artificial satellite 20 (see also Figure 1) and performs interferometric SAR analysis on the received satellite data to determine the vertical displacement of the ground surface 502 of the ground 500, buildings 200, 210, 230, and structures 220 shown in Figure 1.

[0040] In this embodiment, "vertical displacement" is referred to as "vertical displacement." Furthermore, the vertical displacement of the ground surface 502 is denoted as S0, the vertical displacement of building 200 as S1, the vertical displacement of building 210 as S2, the vertical displacement of building 230 as S4, and the vertical displacement of structure 220 as S3.

[0041] Interferometric SAR analysis is described in Non-Patent Documents 1, 2, and 3 mentioned above. In short, interferometric SAR analysis involves emitting radio waves (microwaves) from satellite 20 and analyzing the vertical displacement by detecting the phase change of the reflected radio waves. In other words, interferometric SAR analysis works by simulating "interference" between the radio waves observed before and after the displacement, as the radio waves are slightly shifted by the amount of the displacement.

[0042] In this embodiment, the average vertical displacement of a certain range including buildings 200, 210, 230 and structure 220 is defined as the vertical displacement of buildings 200, 210, 230 and structure 220.

[0043] After launching the artificial satellite 20 (see also Figure 1), observations are basically continued continuously. However, it is difficult to acquire satellite data every time satellite 20 passes over the observation target area, and the satellite data contains various kinds of noise. Therefore, in this embodiment, the analysis unit 30 performs interferometric SAR analysis on the satellite data acquired over a certain period (for example, six months) all at once to determine the vertical displacement of the ground surface 502 of the ground 500, buildings 200, 210, 230, and structures 220. Although such analysis methods are generally performed using interferometric SAR analysis, the method is not limited to this.

[0044] The observation data acquisition unit 110 then acquires and stores observation data of the vertical displacement of the ground surface 502 of the ground 500, buildings 200, 210, 230, and structures 220 after interferometric SAR analysis from the analysis unit 30. Alternatively, the vertical displacement from the initial state (start of observation) may be determined from the changes from the initial state (start of observation), or the vertical displacement from the initial state (start of observation) may be determined by accumulating the changes since the previous observation.

[0045] The geological data acquisition unit 120 acquires geological data via the input unit 122, which consists of the geological configuration 500K and the geological layers in the geological configuration 500K where the leading edges of the foundations of buildings 200, 210, 230 and structure 220 are anchored. To explain from another perspective, the geological data acquisition unit 120 acquires geological data of the geological configuration 500K of the ground 500, where the geological layers supporting the leading edges of the foundations of buildings 200, 210, 230 and structure 220 are identified, from the input unit 122. The geological data is created by a computer or the like based on the aforementioned design documents, and the geological data acquisition unit 120 acquires the geological data via the input unit 122.

[0046] In this embodiment, the geological data is in CSV format created using spreadsheet software such as Microsoft Excel®, but it is not limited to this. Furthermore, the input unit 122 only needs to have the function of inputting the geological data into the geological data acquisition unit 120. Specifically, this could be a connection unit that connects to the computer that created the geological data via a cable, or a connector to which a storage device such as a USB memory containing the geological data is connected.

[0047] The derivation unit 130 derives the amount of settlement over time for each geological layer of the ground 500 from the observation data and geological layer data. Specifically, the vertical displacement of buildings 200, 210, 230 and structures 220 is taken as the settlement amount of the geological layer in which the tip of each foundation is anchored, and the amount of settlement over time for each geological layer is derived. The derivation results are displayed on a monitor (not shown) or the like.

[0048] (Examples of deriving settlement amounts over time for different geological layers) Next, a specific example of derivation performed by the derivation unit 130 in this embodiment will be described. Note that the vertical displacement and settlement amounts are the changes from the initial state (start of observation) to the time of the current measurement.

[0049] The vertical displacements of buildings 200, 210, 230 and structure 220 shown in Figure 1 are defined as the time-dependent settlement of the geological layer in which the leading edge of each foundation is anchored. Specifically, the vertical displacement S4 of building 230 is defined as the settlement of the second gravel layer 518, and the vertical displacement S3 of structure 220 is defined as the settlement of the first gravel layer 514.

[0050] In this embodiment, the change in the thickness of the compressed stratum is also calculated. Therefore, an example of a method for calculating the change in stratum thickness will be described next.

[0051] The settlement of the second gravel layer 518 is the sum of the thickness changes of the deep layer 520 below the second gravel layer 518. Similarly, the settlement of the first gravel layer 514 is the sum of the thickness changes of the second clay layer 516, the second gravel layer 518, and the deep layer 520, which are the layers below the first gravel layer 514.

[0052] Therefore, the settlement amount of the second gravel layer 518, that is, the vertical displacement amount S4 of the building 230, is taken as the total thickness change amount R4 of the deep layer 520.

[0053] Furthermore, the difference between the settlement of the second gravel layer 518 and the settlement of the first gravel layer 514, that is, the difference between the vertical displacement S4 of the building 230 and the vertical displacement S3 of the structure 220, is calculated, and the calculated result is taken as the change in thickness R3 of the second clay layer 516.

[0054] Furthermore, the difference between the settlement of the first gravel layer 514 and the embankment layer 510, that is, the difference between the vertical displacement S3 of the structure 220 and the vertical displacement S2 of the building 210, is calculated, and the calculated result is taken as the change in thickness R2 of the first clay layer 512.

[0055] Furthermore, the vertical displacement S2 of the building 210 is the sum of the thickness changes of the first clay layer 512, the first gravel layer 514, the second clay layer 516, the second gravel layer 518, and the deep layer 520 below them, all of which are below the embankment layer 510. Therefore, the difference between the vertical displacement S2 of the building 210 and the vertical displacement S0 of the ground surface 502 is defined as the thickness change R1 of the embankment layer 510.

[0056] Furthermore, the vertical displacement S1 of the building 200, which has a direct foundation 202, is the same as or approximately the same as the vertical displacement S0 of the ground surface 502. If the vertical displacement S1 is significantly larger than the vertical displacement S0, it is possible that the ground directly beneath the building 200 is settling locally for some reason.

[0057] Here, the first gravel layer 514 and the second gravel layer 518 are so-called supporting layers, and it is considered that there is little to no change in their thickness. However, the first clay layer 512 and the second clay layer 516 are so-called soft layers, and it is considered that changes in their thickness occur, causing the first gravel layer 514 and the second gravel layer 518 to settle. In the example described later, the embankment layer 510 has little to no change in thickness. However, generally speaking, embankment layers often change in thickness.

[0058] (Explanation using a flowchart) Next, an example of derivation and calculation performed by the CPU of the derivation unit 130 will be explained using the flowchart in Figure 6. The CPU reads the program, loads it into RAM, and executes it to perform the derivation process. Note that the calculation of differential settlement of the building 200 is not reflected here.

[0059] The CPU uses the vertical displacement amounts of buildings 200, 210, 230 and structure 220 shown in Figure 1 as the settlement amounts of the soil layers in which the leading edges of their respective foundations are anchored. Specifically, the vertical displacement amount S4 of building 230 is set as the settlement amount of the second gravel layer 518, and the vertical displacement amount S3 of structure 220 is set as the settlement amount of the first gravel layer 514 (step S101 in Figure 6).

[0060] Next, the CPU uses the vertical displacement S4 of the building 230 as the total thickness change R4 of the deep layer 520 (step S102 in Figure 6).

[0061] Next, the CPU calculates the difference between the vertical displacement S4 of building 230 and the vertical displacement S3 of structure 220, and uses this difference as the change in thickness R3 of the second clay layer 516 (step S103 in Figure 6).

[0062] Next, the CPU calculates the difference between the vertical displacement S2 of building 210 and the vertical displacement S3 of structure 220, and uses this difference as the change in thickness R2 of the first clay layer 512 (step S104 in Figure 6).

[0063] Next, the CPU calculates the difference between the vertical displacement S1 of the building 210 and the vertical displacement S0 of the ground surface 502, and uses this difference as the change in the thickness of the embankment layer 510, R1 (step S105 in Figure 6).

[0064] (Example of derived result) Next, using Figure 3, we will explain an example of the derivation results for the amount of settlement over time for each geological layer in ground 500. In reality, measurements are performed periodically, so the data is discrete, but in Figure 3, these are connected to form a line.

[0065] Figure 3 shows the changes over time in the vertical displacement S0 of the ground surface 502 (see Figure 1), the vertical displacement S1 of building 200 (see Figure 1), the vertical displacement S2 of building 210 (see Figure 1), the vertical displacement S3 of structure 220 (see Figure 1), and the vertical displacement S4 of building 230. As mentioned above, vertical displacements S0 and S1 are the settlement of the ground surface 502, vertical displacement S3 is the settlement of the first gravel layer 514 (see Figure 1), and vertical displacement S4 is the settlement of the second gravel layer 518 (see Figure 1).

[0066] Furthermore, R1, obtained by subtracting vertical displacement S2 from vertical displacement S0 and S1, represents the change in thickness of embankment layer 510. R2, obtained by subtracting vertical displacement S3 from vertical displacement S2, represents the change in thickness of the first clay layer 512, and R3, obtained by subtracting vertical displacement S4 from vertical displacement S3, represents the change in thickness of the second clay layer 516. Finally, vertical displacement S4 represents the total change in thickness R4 of the deep layer 520.

[0067] (Verification by numerical analysis) Next, we will explain the results of our numerical analysis, which involved creating the analysis model shown in Figure 1 and verifying that the vertical displacement S4 of building 230 corresponds to the settlement of the second gravel layer 518, and the vertical displacement S3 of structure 220 corresponds to the settlement of the first gravel layer 514.

[0068] As shown in Figures 4(A) and 4(B), the thickness of the first clay layer 512 changed from D1 to D2, and the thickness of the second clay layer 516 changed from D3 to D4. The thicknesses of the other layers were assumed to remain unchanged.

[0069] Figure 4(A) shows the initial state, which is the same as Figure 1. Figure 4(B) shows the results of the numerical analysis. As can be seen in Figure 4(B), structure 220 and building 230 protrude from the ground surface 502. Furthermore, the height difference F1 between the ground surface 502 and building 230 is equal to the sum of the thickness change of the first clay layer 512 and the thickness change of the second clay layer 516, the height difference F2 between the ground surface 502 and structure 220 is equal to the thickness change of the first clay layer 512, and the height difference F3 between building 230 and structure 220 is equal to the thickness change of the second clay layer 516. Note that the height difference F1 between the ground surface 502 and building 230 is the sum of the thickness change F1 of the first clay layer 512 and the thickness change F2 of the second clay layer 516.

[0070] Figure 5 is a graph showing the changes in vertical displacement S0 of the ground surface 502 (see Figure 4), vertical displacement S1 of building 200 (see Figure 4), vertical displacement S2 of building 210 (see Figure 4), vertical displacement S3 of structure 220 (see Figure 4), and vertical displacement S4 of building 230, created based on the analysis results. Although not shown in the illustration, it was confirmed that the changes in settlement of the ground surface 502, the first gravel layer 514, and the second gravel layer 518 are exactly the same as those in Figure 5. In other words, numerical analysis confirmed that the vertical displacement S4 of building 230 is the settlement of the second gravel layer 518, and the vertical displacement S3 of structure 220 is the settlement of the first gravel layer 514. Note that vertical displacement S0 and vertical displacements S1 and S2 are the same, but for clarity, they are shown not overlapping in Figure 5.

[0071] [Mechanism of Action and Effects] Next, the operation and effects of this embodiment will be described.

[0072] In the layered settlement measurement device 100 and layered settlement measurement system 10 of this embodiment, the vertical displacement amounts of buildings 200, 210, 230 and structures 220 shown in Figure 1 in the observation data are taken as the settlement amounts of the geological layers in which the leading edges of their respective foundations are anchored, and the time-dependent settlement amounts for each geological layer are derived.

[0073] The time-series changes in the vertical displacement S0 of the ground surface 502 of the ground 500 and the vertical displacements S1, S2, S3, S4 of buildings 200, 210, 230 and structures 220, which are observational data, are compiled by observing from above. Therefore, for example, there is no need for measurement personnel to periodically go to the site to measure the amount of settlement. Consequently, it is possible to easily and inexpensively perform periodic measurements over a long period, for example, for several decades or more.

[0074] Furthermore, since the observation data is created using interferometric SAR analysis with artificial satellite 20, high-precision observation data can be produced over a long period of time.

[0075] Furthermore, by utilizing existing buildings 200, 210, and 230, it is only necessary to construct a new structure 220. Also, since geological data is created from the design documents of buildings 200, 210, and 230, it is possible to understand the geological composition of 500K without, for example, conducting boring surveys.

[0076] <Other> Furthermore, the present invention is not limited to the embodiments described above.

[0077] For example, in the above embodiment, the vertical displacement between the existing buildings 200, 210, and 230 and the newly constructed measurement-dedicated structure 220 was measured, but the embodiment is not limited to this. Only the vertical displacement of the existing buildings may be measured, or only the vertical displacement of the multiple newly constructed measurement-dedicated structures may be measured.

[0078] Furthermore, while the above embodiment involved determining the settlement amount and thickness change for each geological layer, it is not limited to this. At a minimum, determining the settlement amount for each geological layer is sufficient.

[0079] Furthermore, while the above embodiment measured the vertical displacement of existing buildings 200, 210, and 230 and a newly constructed measurement-dedicated structure 220, it is not limited to this. Vertical displacement may be measured using satellites by methods other than interferometric SAR analysis. Alternatively, vertical displacement may be measured from aerial photographs and input into the observation data acquisition unit.

[0080] Furthermore, for example, in the above embodiment, the computer automatically derived the settlement amount for each geological layer, but this is not the only way to do so. The worker may use a calculator to derive the settlement amount for each geological layer of the ground over time, using observational data created by observing the changes in the vertical displacement of the ground surface and the vertical displacement of structures built on the ground over time from above, and geological data of the geological structure of the ground in which the geological layer supporting the tip of the foundation of the structure has been identified.

[0081] Furthermore, while the foundation in the above embodiment was a direct foundation or a pile foundation, it is not limited to these. The foundation may also be, for example, a ground improvement body.

[0082] Furthermore, the present invention can be implemented in various forms without departing from the spirit of the invention. [Explanation of symbols]

[0083] 10-layer settlement measurement system 20 satellites 100-layer settlement measurement device 110 Observation data acquisition unit 120 Geological Strata Data Acquisition Unit 130 Derivation part 200 Buildings (Examples of structures) 210 Buildings (Examples of structures) 220 Structures 230 Buildings (Examples of structures) 500 ground 500K strata composition 502 Ground surface

Claims

1. An observation data acquisition unit that acquires observation data created by observing the vertical displacement of the ground surface and the vertical displacement of structures constructed on the ground over time from above, A geological data acquisition unit that acquires geological data of the geological structure of the ground in which the geological layer to which the tip of the foundation supporting the aforementioned structure is anchored is identified, The vertical displacement of the structure in the observation data is taken as the settlement of the geological layer in which the tip of the foundation supporting the structure is anchored, and the derivation unit derives the time-series settlement of the ground for each geological layer from the observation data and the geological layer data. A layered settlement measurement device equipped with [specific features / features].

2. The aforementioned observational data is created using interferometric SAR analysis with satellites. The stratified settlement amount measuring device according to claim 1.

3. The aforementioned structure is an existing building. The aforementioned geological data is created from the design documents of the aforementioned building. A stratified settlement amount measuring device according to claim 1 or claim 2.

4. An observation data acquisition step involves obtaining observation data created by observing the changes over time in the vertical displacement of the ground surface and the vertical displacement of structures constructed on the ground from above, A geological data acquisition step involves acquiring geological data of the geological structure of the ground in which the geological layer to which the tip of the foundation supporting the aforementioned structure is anchored has been identified, The vertical displacement of the structure in the observation data is taken as the settlement of the geological layer to which the tip of the foundation supporting the structure is anchored, and the derivation process is to derive the time-dependent settlement of the geological layer of the ground from the observation data and the geological layer data. A method for measuring layered settlement amounts, equipped with the necessary components.

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