JP2018096824A - Method and device for soil property measurement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a dry density and a moisture content of soil without specifying the number of compacting operations.SOLUTION: A resistance of soil is measured in a resistance measurement step, and a mass moisture content of soil is calculated in the mass moisture content calculation step by a first correlation with a strength of a micro wave measured in a microwave reflection strength measurement step, the strength of the microwave reflected from soil, and a mass moisture content of soil. A dry density of soil is calculated in a dry density calculation step by a second correlation with the resistance measured by a resistance measurement step, the mass moisture content calculated by the mass moisture content calculation step, a resistance of soil, a mass moisture content, and a dry density. The moisture content of soil is calculated in a moisture content calculation step by a third correlation with the mass moisture content calculated by the mass moisture content calculation step, the dry density calculated by a dry density calculation step, the moisture content of the soil and the dry density. Thus, the dry density of soil and the mass moisture content of soil can be measured without specifying the number of compacting operations.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a soil measurement method and a soil measurement device.

  Soil quality control regulations at the time of embankment construction are classified into three categories: (1) dry density regulations, (2) air porosity ratio regulations (saturation degree regulations), and (3) strength characteristic regulations. Tests for evaluating whether (1) dry density regulations and (2) air porosity regulations are satisfied include density measurement (sand substitution method, water substitution method) and RI method, and (3) strength characteristic definition. Examples of the test for evaluating the satisfaction of the cone include a cone penetration test and a flat plate loading test. These quality control methods have a drawback that only a narrow measurement point can be obtained, and it takes time to perform the test.

  In view of this, a technique for quickly measuring the dry density of soil at various locations on the construction site has been proposed. For example, in the method described in Patent Document 1, a compaction test is performed many times at a test site, and a graph curve indicating the correlation between the moisture content of soil and the dry density for each number of compactions is obtained. . Based on the known moisture content, the correlation between the dry density and the volumetric moisture content, and the graph curve showing the correlation between the moisture content of the soil and the dry density for each number of compactions, A curve of a graph showing the correlation between the volumetric moisture content of the soil and the dry density is obtained.

  At the construction site, the volumetric water content of the soil at the construction site is measured. The volumetric moisture content of soil at the construction site is based on the impedance or propagation speed when electromagnetic waves are transmitted through the soil, and when electromagnetic waves are transmitted through the reference medium. Measured. On the curve of the graph showing the correlation between the volumetric moisture content of the soil and the dry density corresponding to the number of compactions performed on the soil at the construction site, the value of the dry density corresponding to the measured volumetric moisture content is Measured as the dry density of the soil.

JP 2007-010568 A

  By the way, in the above-mentioned technique, unless the number of compaction is specified, a single curve of the graph showing the correlation between the volumetric moisture content of the soil and the dry density obtained for each compaction is specified. It is not possible to determine the dry density of the soil. Therefore, with the above technology, it is not possible to confirm the effect of compaction by measuring the dry density of soil and the moisture content of soil without specifying the number of compactions. Is desired.

  Therefore, an object of the present invention is to provide a soil measurement method and a soil measurement device that can measure the dry density of soil and the moisture content of soil without specifying the number of times of compaction.

  The present invention includes a resistivity measurement step for measuring the resistivity of soil, a microwave reflection intensity measurement step for irradiating the soil with microwaves and measuring the intensity of the microwave reflected from the soil, and a microwave reflection intensity measurement. The volumetric moisture content of the soil is determined by the first correlation between the intensity of the microwave reflected from the soil measured by the process and the intensity of the microwave reflected from the soil and the volumetric moisture content of the soil. Soil resistivity measured by the volume moisture content derivation process, the resistivity measurement process, the soil volume moisture content derived by the volume moisture content derivation process, the soil resistivity and the soil volume moisture content. And the second predetermined correlation between the dry density of the soil and the dry density deriving step of deriving the dry density of the soil, the volumetric moisture content of the soil derived by the volume moisture content deriving step, and the dry density The soil derived by the derivation process Soil measurement comprising a dry density, a moisture content deriving step for deriving a moisture content ratio of the soil by a predetermined third correlation between the soil moisture content, the soil dry density, and the soil moisture content Is the method.

  According to this configuration, the resistivity of the soil is measured in the resistivity measurement step, the intensity of the microwave measured in the microwave reflection intensity measurement step, the strength of the microwave reflected from the soil, and the volumetric water content of the soil The volume moisture content of the soil is derived in the volume moisture content deriving step. The soil resistivity measured by the resistivity measurement step, the soil volume moisture content derived by the volume moisture content deriving step, the soil resistivity, the soil volume moisture content, and the soil dry density are defined in advance. According to the second correlation, the dry density of the soil is derived in the dry density deriving step. Further, the volumetric moisture content of the soil derived by the volume moisture content deriving step, the dryness density of the soil derived by the drying density deriving step, the volumetric moisture content of the soil, the dryness density of the soil, and the moisture content of the soil in advance. Based on the specified third correlation, the water content ratio of the soil is derived in the water content ratio deriving step. That is, without specifying the number of times of compaction, both the dry density and the moisture content of the soil can be derived from the first correlation, the second correlation, and the third correlation. Thereby, the dry density of the soil and the moisture content of the soil can be measured without specifying the number of times of compaction.

  In this case, it further comprises a compacting process for compacting the soil. In the resistivity measuring process, the resistivity of the soil after the compacting process is measured, and in the microwave reflection intensity measuring process, it is reflected from the soil after the compacting process. It is preferable to measure the intensity of the microwave.

  According to this configuration, the resistivity measurement step measures the resistivity of the soil after the compaction step, and the microwave reflection strength measurement step measures the intensity of the microwave reflected from the soil after the compaction step. Therefore, the dry density derivation process derives the dry density of the soil after the compaction process, and the moisture content derivation process derives the soil moisture content after the compaction process. Can be confirmed.

  In this case, the compaction process is performed by a compaction machine, and in the resistivity measurement process, the resistivity of the soil after the compaction process is measured by an electrode disposed at the rear of the compaction machine in the traveling direction, and microwave reflection is performed. In the strength measurement process, it is preferable to measure the intensity of the microwave reflected from the soil after the compacting process by a microwave irradiator and a microwave measuring instrument arranged at the rear of the compaction machine in the traveling direction. .

  According to this configuration, in the resistivity measurement process, the resistivity of the soil after the compaction process is measured by the electrode disposed behind the advancing direction of the compaction machine, and in the microwave reflection intensity measurement process, the compaction machine Since the intensity of the microwave reflected from the soil after the compacting process is measured by the microwave irradiator and the microwave measuring instrument arranged behind the traveling direction of the soil, the soil after the compacting process is measured by a simple method. The dry density and water content ratio can be derived.

  In this case, in the resistivity measurement step, the depth for measuring the resistivity of the soil after the compaction step is adjusted by adjusting the distance between the pair of electrodes arranged behind the direction of travel of the compaction machine, In the wave reflection intensity measurement process, the depth to measure the intensity of the microwave reflected from the soil after the compaction process is adjusted by adjusting the output of the microwave irradiator placed behind the direction of travel of the compaction machine. It is preferable to adjust.

  According to this configuration, in the resistivity measurement step, the depth for measuring the resistivity of the soil after the compaction step is adjusted by adjusting the distance between the pair of electrodes arranged behind the direction of travel of the compaction machine. In the microwave reflection intensity measurement process, the intensity of the microwave reflected from the soil after the compaction process is measured by adjusting the output of the microwave irradiator placed behind the direction of travel of the compaction machine. Since the depth to be adjusted is adjusted, the resistivity of the soil and the depth at which the intensity of the microwave reflected from the soil is measured can be adjusted by a simple method.

  Also, in the drying density derivation process, the position of any one of the compacting machine, electrode, microwave irradiator and microwave measuring instrument measured by the GNSS (Global Navigation Satellite System) survey is associated with the soil drying density. In the moisture content deriving step, it is preferable to derive the position of any one of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring device measured by the GNSS survey in association with the moisture content of the soil. is there.

  According to this configuration, in the drying density deriving step, the position of any one of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring instrument measured by the GNSS survey and the soil drying density are derived in association with each other. In the moisture content deriving step, the position of any one of the compacting machine, the electrode, the microwave irradiator and the microwave measuring device measured by the GNSS survey is derived in association with the moisture content of the soil. The effect of the compaction process for each point where the process was performed can be confirmed.

  On the other hand, the present invention includes a resistivity measurement unit that measures the resistivity of soil, a microwave reflection intensity measurement unit that irradiates the soil with microwaves and measures the intensity of the microwave reflected from the soil, and a microwave reflection The volume of the soil is determined by the intensity of the microwave reflected from the soil measured by the intensity measuring unit and the first predetermined correlation between the intensity of the microwave reflected from the soil and the volumetric water content of the soil. Volume moisture content deriving unit for deriving moisture content, soil resistivity measured by resistivity measuring unit, soil volume moisture content derived by volume moisture content deriving unit, soil resistivity and soil volume Based on the second predetermined correlation between the moisture content and the dry density of the soil, a dry density deriving unit for deriving the dry density of the soil, a volume moisture content of the soil derived by the volume moisture content deriving unit, The dry density of the soil derived by the dry density deriving section; By the volumetric water content of the soil dry density and soil water content ratio of the third correlation and defined in advance of a soil measuring apparatus equipped with a water content ratio deriving unit that derives the water content ratio of the soil.

  In this case, a compaction unit for compacting the soil is further provided, the resistivity measurement unit measures the resistivity of the soil after compacted by the compaction unit, and the microwave reflection intensity measurement unit is measured by the compaction unit. It is preferred to measure the intensity of the microwave reflected from the soil after compaction.

  In this case, the compaction unit compacts the soil with a compaction machine, and the resistivity measurement unit confirms the resistivity of the soil after compacted by the compaction machine with an electrode arranged behind the compaction machine in the traveling direction. The microwave reflection intensity measuring part was reflected from the soil after being compacted by the compacting machine by the microwave irradiator and the microwave measuring instrument arranged at the rear of the compacting machine in the traveling direction. It is preferable to measure the intensity of the microwave.

  In this case, the resistivity measuring unit adjusts the distance between the pair of electrodes arranged behind the direction of travel of the compacting machine, thereby measuring the resistivity of the soil after compacted by the compacting machine. The microwave reflection intensity measuring unit is reflected from the soil after being compacted by the compacting machine by adjusting the output of the microwave irradiator placed behind the direction of travel of the compacting machine. It is preferable to adjust the depth at which the microwave intensity is measured.

  The dry density deriving unit derives the position of any one of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring instrument measured by GNSS (Global Navigation Satellite System) survey and the dry density of the soil in association with each other. It is preferable that the moisture content deriving unit derives the position of any one of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring device measured by the GNSS survey in association with the moisture content of the soil. is there.

  According to the soil measurement method and soil measurement apparatus of the present invention, the dry density of soil and the moisture content of soil can be measured without specifying the number of times of compaction.

It is a block diagram which shows the structure of the soil quality measuring apparatus of 1st Embodiment. It is a flowchart which shows the process of the soil measurement method of 1st Embodiment. (A) is a figure which shows the space | interval of an electrode when the depth which measures soil resistivity is shallow, (B) is the space | interval of an electrode when the depth which measures the resistivity of soil is deeper than (A). FIG. It is a graph which shows the 1st correlation previously prescribed | regulated with the intensity | strength of the microwave reflected from the soil, and the volumetric water content of the soil. It is a graph which shows the 2nd predetermined correlation with the resistivity of the soil in the soil containing general sand, the volume moisture content of the soil, and the dry density of the soil. It is a side view which shows the structure of the soil quality measuring apparatus of 2nd Embodiment.

  Hereinafter, embodiments of a soil measurement method and a soil measurement device according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the soil quality measuring apparatus 1 </ b> A according to the first embodiment of the present invention is integrated with a compacting machine 11 such as a load roller, and the dry density of the soil after compacted by the compacting machine 11. The effect of compaction by the compaction machine 11 is confirmed by deriving the water content ratio.

  A soil measuring apparatus 1A includes a resistivity measuring unit 2, a microwave reflection intensity measuring unit 3, a volume moisture content deriving unit 4, a dry density deriving unit 5, a moisture content deriving unit 6, a compacting unit 7, a compacting machine 11, and electrodes. 12, a microwave irradiator 13, a microwave measuring instrument 14, a GNSS surveying unit 15, and a display 16. The resistivity measuring unit 2, the microwave reflection intensity measuring unit 3, the volume water content deriving unit 4, the dry density deriving unit 5 and the water content deriving unit 6 are a CPU [Central Processing Unit], a ROM [Read Only Memory], a RAM [Random An electronic control unit having an “Access Memory” or the like. In the electronic control unit, a program stored in the ROM is loaded into the RAM and executed by the CPU, thereby executing various controls and operations described later.

  The resistivity measuring unit 2 measures the resistivity of the soil. The resistivity measuring unit 2 measures the resistivity of the soil after being compacted by the compacting machine 11 by the electrode 12 disposed at the rear of the compacting machine 11 in the traveling direction T. The electrode 12 is, for example, a roller type (wheel type) having a disk, cylinder, polygonal plate or polygonal column shape that can move together with the compacting machine 11 while rolling on the soil as the compacting machine 11 advances. ) Electrode.

  For example, four roller-type electrodes 12 are arranged in parallel in the width direction of the compacting machine 11, and the resistivity of the soil is measured by the Wenner method. The distance between the four roller-type electrodes 12 can be enlarged and reduced. As will be described later, the resistivity measuring unit 2 is compacted by the compacting machine 11 by adjusting the distance between the pair of roller-type electrodes 12 arranged behind the traveling direction T of the compacting machine 11. Adjust the depth at which the soil resistivity is measured later. The soil quality measuring apparatus 1A includes either a suspension (not shown) or a weight that presses against the surface of the soil with a predetermined force so that the roller-type electrode 12 does not jump from the surface of the soil.

  The microwave reflection intensity measurement unit 3 irradiates the soil with microwaves and measures the intensity of the microwave reflected from the soil. The microwave reflection intensity measuring unit 3 is reflected from the soil after being compacted by the compacting machine 11 by the microwave irradiator 13 and the microwave measuring instrument 14 disposed behind the compacting machine 11 in the traveling direction T. The intensity of the applied microwave is measured. The microwave irradiator 13 is composed of, for example, a magnetron and a waveguide. The microwave irradiator 13 is capable of adjusting the output (at least one of amplitude and frequency) of the microwave irradiated to the soil. As will be described later, the microwave reflection intensity measuring unit 3 was compacted by the compacting machine 11 by adjusting the output of the microwave irradiator 13 disposed behind the traveling direction T of the compacting machine 11. Adjust the depth to measure the intensity of the microwave reflected from the later soil. The microwave measuring instrument 14 is composed of, for example, a waveguide and a diode.

  As will be described later, the volumetric water content deriving unit 4 is configured to measure the intensity of the microwave reflected from the soil, the intensity of the microwave reflected from the soil, and the volumetric water content of the soil. The volumetric water content of the soil is derived from the first correlation specified in advance. The volumetric water content of the soil means the ratio of the volume of water contained in the soil to the volume of the soil, and is displayed as a percentage in the present embodiment.

  As will be described later, the dry density deriving unit 5 includes the soil resistivity measured by the resistivity measuring unit 2, the volume moisture content of the soil derived by the volume moisture content deriving unit 4, the soil resistivity and the soil. The dry density of the soil is derived from the second predetermined correlation between the volumetric moisture content of the soil and the dry density of the soil. In addition, the dry density of soil means the ratio of the mass of the soil particle contained in the soil with respect to the volume of the soil. Further, the dry density deriving unit 5 includes any one of the positions of the compacting machine 11, the electrode 12, the microwave irradiator 13, and the microwave measuring instrument 14 measured by the GNSS (Global Navigation Satellite System) surveying by the GNSS surveying unit 15. The soil dry density is derived in association with it, and the derived result is displayed on the display 16.

  As will be described later, the water content ratio deriving unit 6 includes the volumetric water content of the soil derived by the volumetric water content deriving unit 4, the dry density of the soil derived by the dry density deriving unit 5, and the volumetric water content of the soil. The moisture content of the soil is derived from the third predetermined correlation between the dry density of the soil and the moisture content of the soil. The water content ratio of soil means the ratio of the mass of water contained in the soil to the mass of soil particles contained in the soil, and is expressed as a percentage in the present embodiment. In addition, the water content ratio deriving unit 6 includes any position of the compacting machine 11, the electrode 12, the microwave irradiator 13 and the microwave measuring device 14 measured by the GNSS surveying by the GNSS surveying unit 15 and the water content ratio of the soil. Are derived in association with each other, and the derived result is displayed on the display 16.

  The GNSS surveying unit 15 receives a signal from three or more satellites, thereby positioning the position of the compacting machine 11 or the like (for example, the latitude and longitude of the compacting machine 11 or the like). Instead of the GNSS surveying by the GNSS surveying unit 15, the position of the compacting machine 11 or the like may be measured by an automatic tracking TS (Total Station) using an optical surveying function. The display 16 is a liquid crystal display, for example, and displays the position on the map, the dry density of the soil, and the moisture content of the soil in association with the command signals from the dry density deriving unit 5 and the moisture content deriving unit 6.

  The compacting unit 7 compacts the soil by the compacting machine 11 while controlling the compacting machine 11. The compacting machine 11 may be a roller-type machine such as a road roller, a tire roller, a tamping roller, a vibration roller, a Macadam roller, a combined roller and a hand guide roller, or a flat type machine such as a plate compactor and a tamper. it can.

  Hereinafter, the soil measurement method of this embodiment will be described. As shown in FIG. 2, a compacting step for compacting the soil is performed by the compacting unit 7 of the soil quality measuring apparatus 1A (S1). The compacting process is performed by a compacting machine 11 controlled by the compacting unit 7. A resistivity measuring step of measuring the resistivity of the soil is performed by the resistivity measuring unit 2 of the soil measurement device 1A (S2). In the resistivity measuring process, the resistivity of the soil after the compacting process is measured by the electrode 12 disposed at the rear of the compacting machine 11 in the traveling direction.

  As shown in FIGS. 3 (A) and 3 (B), in the resistivity measuring step, by adjusting the distances d1 and d2 between the pair of electrodes 12 arranged behind the advancing direction T of the compacting machine 11 The depths D1 and D2 for measuring the resistivity of the soil S after the compacting step are adjusted. As shown in FIG. 3A, when the distance d1 between the electrodes 12 is shortened, the resistivity of the soil S at the measurement point P1 at the shallow depth D1 can be measured. As shown in FIG. 3B, when the distance d2 between the electrodes 12 is increased, the resistivity of the soil S at the measurement point P2 at the depth D2 deeper than the depth D1 can be measured. In the example of FIGS. 3A and 3B, an example of measuring the resistivity by the Wenner method is shown, but other 4-pole methods, 2-pole methods, and 3-pole methods are also applied in the same manner. be able to.

  In parallel with the resistivity measurement step, a microwave reflection intensity measurement step is performed in which the microwave reflection intensity measurement unit 3 of the soil measurement device 1A irradiates the soil with microwaves and measures the intensity of the microwave reflected from the soil. Performed (S3). In the microwave reflection intensity measurement process, the intensity of the microwave reflected from the soil after the compaction process by the microwave irradiator 13 and the microwave measurement instrument 14 disposed behind the traveling direction T of the compaction machine 11 is determined. Measured. In the microwave reflection intensity measuring step, the intensity of the microwave reflected from the soil after the compacting step is adjusted by adjusting the output of the microwave irradiator 13 disposed behind the traveling direction T of the compacting machine 11. The depth to measure is adjusted.

  The volume moisture content deriving unit 4 of the soil measurement apparatus 1A uses the microwave intensity reflected by the microwave reflection intensity measurement step, the intensity of the microwave reflected from the soil, and the volume moisture content of the soil. The volume moisture content deriving step for deriving the volume moisture content of the soil is performed based on the first predetermined correlation (S4).

  It has been confirmed that the intensity of the microwave reflected from the soil and the volumetric water content of the soil have a first correlation as shown in FIG. C20_80% in FIG. 4 indicates that the soil is a C20 crusher orchid stipulated in JIS A 5001 of the Japanese Industrial Standard, and its compaction degree is 80 [%]. Inagi sand_80% , The soil is Inagi sand, and its compaction degree is 80 [%]. As shown in FIG. 4, the first correlation between the intensity of the microwave reflected from the soil and the volumetric water content of the soil is defined by the approximate straight line. The volume moisture content deriving unit 4 derives the volume moisture content corresponding to the intensity of the microwave reflected from the soil measured by the microwave reflection intensity measurement step in the approximate straight line as the volume moisture content of the soil.

  The soil resistivity measured by the resistivity measurement step, the soil volume moisture content derived by the volume moisture content derivation step, the soil resistivity and the soil volume by the dry density derivation unit 5 of the soil measurement device 1A. A drying density deriving step for deriving the soil drying density is performed based on the second predetermined correlation between the moisture content and the soil drying density (S5).

  It is confirmed that the soil resistivity, the soil volume moisture content, and the soil dry density have a second correlation as shown in FIG. 5 when the soil having the same volume moisture content is arranged. In FIG. 5, θ = 20 means a line indicating the second correlation between the resistivity of the soil having a volume moisture content θ of the soil of 20 [%] and the dry density. The line indicating the second correlation between the soil resistivity and the dry density at the same volumetric water content in FIG. 5 is, for example, a sample having a composition similar to that of the soil subjected to the compaction process in advance. It can be obtained by measuring the resistivity while changing the water content ratio and the dry density. In FIG. 5, a line indicating the second correlation between the soil resistivity and the dry density at the volume moisture content is determined by the volume moisture content derived by the volume moisture content deriving step. The dry density deriving unit 5 derives the dry density corresponding to the resistivity of the soil assumed by the resistivity measurement step in the line indicating the second correlation as the dry density of the soil.

The moisture content deriving unit 6 of the soil quality measuring apparatus 1A uses the volumetric moisture content of the soil derived by the volumetric moisture content deriving step, the dry density of the soil derived by the dry density deriving step, the volumetric moisture content of the soil, A water content ratio deriving step for deriving the water content ratio of the soil is performed based on the third predetermined correlation between the dry density and the water content ratio of the soil (S6). There is a third correlation shown in the following formula (1) among the soil volume moisture content θ [%], the soil dry density ρ _d [g / cm ³ ] and the moisture content w [%]. It has been known. The moisture content deriving unit 6 substitutes the soil volume moisture content θ derived by the volume moisture content deriving step and the soil dry density ρ _d derived by the dry density deriving step into the equation (1), The moisture content w of the soil is derived.

The dry density deriving step, compaction machine 11 which is positioning by GNSS survey by the GNSS surveying unit 15, electrode 12, and any position of the microwave irradiator 13 and microwave meter 14, a dry density [rho _d soil In the water content ratio deriving step, the position of the compacting machine 11, the electrode 12, the microwave irradiator 13 and the microwave measuring instrument 14 measured by the GNSS surveying by the GNSS surveying unit 15 and the soil Is derived in association with the water content ratio w. The position where the dry density ρ _d and the water content ratio w are derived and the dry density ρ _d and the water content ratio w are displayed together with the map information on the display 16 to the operator of the compacting machine 11. Thereby, the operator of the compacting machine 11 can confirm the effect of the compacting work while performing the compacting work.

  In this embodiment, the resistivity of the soil is measured in the resistivity measurement step, the intensity of the microwave measured in the microwave reflection intensity measurement step, the strength of the microwave reflected from the soil, and the volumetric water content of the soil, In the volume moisture content deriving step, the volume moisture content of the soil is derived according to the first predetermined correlation. The soil resistivity measured by the resistivity measurement step, the soil volume moisture content derived by the volume moisture content deriving step, the soil resistivity, the soil volume moisture content, and the soil dry density are defined in advance. According to the second correlation, the dry density of the soil is derived in the dry density deriving step. Further, the volumetric moisture content of the soil derived by the volume moisture content deriving step, the dryness density of the soil derived by the drying density deriving step, the volumetric moisture content of the soil, the dryness density of the soil, and the moisture content of the soil in advance. Based on the specified third correlation, the water content ratio of the soil is derived in the water content ratio deriving step. That is, without specifying the number of times of compaction, both the dry density and the moisture content of the soil can be derived from the first correlation, the second correlation, and the third correlation. Thereby, the dry density of the soil and the moisture content of the soil can be measured without specifying the number of times of compaction. Therefore, since the measurement efficiency is improved, the time required for measurement can be remarkably shortened.

  Further, according to the present embodiment, the resistivity of the soil after the compaction process is measured in the resistivity measurement process, and the intensity of the microwave reflected from the soil after the compaction process is measured in the microwave reflection intensity measurement process. Therefore, in the dry density derivation process, the dry density of the soil after the compaction process is derived, and in the moisture content derivation process, the moisture content of the soil after the compaction process is derived. The effect of the process can be confirmed.

  Further, according to the present embodiment, in the resistivity measurement process, the resistivity of the soil after the compaction process is measured by the electrode 12 disposed behind the traveling direction T of the compaction machine 11, and the microwave reflection intensity measurement. In the process, since the intensity of the microwave reflected from the soil after the compacting process is measured by the microwave irradiator 13 and the microwave measuring instrument 14 arranged behind the traveling direction T of the compacting machine, the process is simple. It is possible to derive the dry density and moisture content of the soil after the compacting process by a simple method. Thereby, the dry density and moisture content of the soil immediately after compaction by the compaction machine 11 can be measured immediately.

  Further, according to the present embodiment, in the resistivity measuring step, the resistivity of the soil after the compacting step is adjusted by adjusting the distance between the pair of electrodes 12 disposed behind the traveling direction T of the compacting machine 11. In the microwave reflection intensity measuring step, the output of the microwave irradiator 13 arranged behind the advancing direction T of the compacting machine 11 is adjusted to adjust the output from the soil after the compacting step. Since the depth for measuring the intensity of the reflected microwave is adjusted, the resistivity of the soil and the depth for measuring the intensity of the microwave reflected from the soil can be adjusted by a simple method.

  Further, according to the present embodiment, in the drying density deriving step, the position of any one of the compacting machine 11, the electrode 12, the microwave irradiator 13, and the microwave measuring instrument 14 measured by GNSS surveying, and the drying of soil The density is derived in association with the moisture content deriving step, and in the moisture content deriving step, the position of any one of the compacting machine 11, the electrode 12, the microwave irradiator 13 and the microwave measuring device 14 determined by the GNSS survey and the moisture content ratio of the soil Are derived in association with each other, so that the effect of the compaction process at each point where the compaction process is performed can be confirmed. As a result, in the conventional method, only a narrow measurement result can be obtained, whereas a measurement result on a wider surface can be obtained, and the effect of compaction on the surface can be managed.

  Hereinafter, a second embodiment of the present invention will be described. In the first embodiment, the electrode 12 for measuring the resistivity of the soil, the microwave irradiator 13 and the microwave measuring device 14 for measuring the intensity of the microwave reflected from the soil, and the compacting machine 11 Although integrated, the electrode 12 and the like cannot be integrated with the compacting machine 11, and this embodiment can be applied. As shown in FIG. 6, in the soil measurement device 1 </ b> B of the present embodiment, the electrode 12, the microwave irradiator 13, and the microwave measurement device 14 are travel measurement devices that follow the back of the compaction machine 11 in the traveling direction T. 20 is provided.

  The travel measuring device 20 includes a distance sensor 17 that measures the distance from the compacting machine 11. The distance sensor 17 radiates millimeter waves or ultrasonic waves or the like to the front compacting machine 11 and detects the millimeter waves or ultrasonic waves reflected from the compacting machine 11 to thereby detect the compacting machine 11 and the travel measuring device. The distance to 20 is measured. The electrode 12 is rotated by a drive device (not shown) to keep the distance between the compacting machine 11 and the travel measuring device 20 at a preset length. The travel measuring device 20 may not be provided with a driving device, and may be pulled at a preset distance from the compacting machine 11 by a traction device or the like.

  The travel measurement device 20 includes a GNSS surveying unit 15. The travel measurement device 20 includes a wireless transmitter 18. The resistivity of the soil S measured by the electrode 12, the intensity of the microwave reflected from the soil measured by the microwave measuring instrument 14, and the position of the traveling measuring device 20 measured by the GNSS surveying unit 15 (electrode 12, micro Information regarding the position of the wave irradiator 13 and the microwave measuring instrument 14 is transmitted to the wireless receiver 19 of the compacting machine 11 by wireless communication by the wireless transmitter 18.

  The compacting machine 11 side does not include the electrode 12, the microwave irradiator 13, the microwave measuring instrument 14, and the GNSS surveying unit 15, but includes the wireless receiver 19, and the soil measurement of the first embodiment. It has the same configuration as the apparatus 1A. The drying density deriving unit 5 determines the position of the compaction machine 11, the electrode 12, the microwave irradiator 13, and the microwave measuring instrument 14 measured by the GNSS surveying by the GNSS surveying unit 15, and the soil dry density. Derivation is performed in association with each other, and the derived result is displayed on the display 16. The water content ratio deriving unit 6 calculates the position of any one of the compacting machine 11, the electrode 12, the microwave irradiator 13 and the microwave measuring device 14 measured by the GNSS surveying by the GNSS surveying unit 15 and the water content ratio of the soil. Derivation is performed in association with each other, and the derived result is displayed on the display 16. Even with the above configuration, the same effect as the soil quality measuring apparatus 1A of the first embodiment can be obtained.

  As mentioned above, although embodiment of this invention was described, this invention is implemented in various forms, without being limited to the said embodiment. For example, in the above-described embodiment, the description has centered on the aspect of measuring the dry density and moisture content of the soil after the compaction of the soil, but the present invention, regardless of whether the compaction of the soil is performed, The dry density and moisture content of the soil can be measured. The electrode 12 is not limited to a roller-type electrode, and the resistivity of the soil may be measured by another probe-type electrode.

  DESCRIPTION OF SYMBOLS 1A, 1B ... Soil measuring device, 2 ... Resistivity measuring part, 3 ... Microwave reflection intensity measuring part, 4 ... Volume water content deriving part, 5 ... Dry density deriving part, 6 ... Water content deriving part, 7 ... Compaction , 11 ... Compaction machine, 12 ... Electrode, 13 ... Microwave irradiator, 14 ... Microwave measuring instrument, 15 ... GNSS surveying unit, 16 ... Display, 17 ... Distance sensor, 18 ... Wireless transmitter, 19 ... Wireless Receiver, 20 ... travel measuring device, S ... soil, T ... traveling direction, d1, d2 ... interval, D1, D2 ... depth, P1, P2 ... measurement location.

Claims (10)

A resistivity measuring step for measuring the resistivity of the soil;
A microwave reflection intensity measurement step of irradiating the soil with microwaves and measuring the intensity of the microwaves reflected from the soil;
A predetermined first of the intensity of the microwave reflected from the soil measured by the microwave reflection intensity measuring step, the intensity of the microwave reflected from the soil, and the volumetric water content of the soil. A volume moisture content deriving step of deriving the volume moisture content of the soil according to the correlation of
The resistivity of the soil measured by the resistivity measuring step, the volume moisture content of the soil derived by the volume moisture content deriving step, the resistivity of the soil, and the volume moisture content of the soil. A drying density deriving step of deriving the drying density of the soil according to a second predetermined correlation between
The volume moisture content of the soil derived by the volume moisture content deriving step, the dry density of the soil derived by the dry density deriving step, the volume moisture content of the soil, and the dry density of the soil. And a water content ratio deriving step for deriving the water content ratio of the soil based on a predetermined third correlation between the soil and the water content ratio of the soil. Further comprising a compacting step of compacting the soil;
In the resistivity measurement step, measure the resistivity of the soil after the compaction step,
The soil measurement method according to claim 1, wherein, in the microwave reflection intensity measurement step, the intensity of the microwave reflected from the soil after the compaction step is measured. The compaction process is performed by a compaction machine,
In the resistivity measurement step, the resistivity of the soil after the compaction step is measured by an electrode disposed at the rear of the compaction machine in the traveling direction,
In the microwave reflection intensity measuring step, the intensity of the microwave reflected from the soil after the compacting step by a microwave irradiator and a microwave measuring device arranged behind the direction of travel of the compacting machine The soil quality measuring method according to claim 2 which measures. In the resistivity measurement step, the depth at which the resistivity of the soil after the compaction step is measured is adjusted by adjusting the distance between the pair of electrodes disposed behind the direction of travel of the compaction machine. And
In the microwave reflection intensity measuring step, the microwave reflected from the soil after the compacting step is adjusted by adjusting an output of the microwave irradiator disposed behind the direction of travel of the compacting machine. The soil measurement method according to claim 3, wherein a depth for measuring the strength of the soil is adjusted. In the drying density deriving step, the position of any one of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring instrument measured by GNSS (Global Navigation Satellite System) surveying, and the drying density of the soil And derive
In the water content ratio deriving step, the position of any one of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring device measured by the GNSS survey is associated with the water content ratio of the soil. The soil quality measuring method according to claim 3 or 4, which is derived. A resistivity measuring unit for measuring the resistivity of the soil;
A microwave reflection intensity measuring unit that irradiates the soil with microwaves and measures the intensity of the microwave reflected from the soil;
A predetermined first of the intensity of the microwave reflected from the soil measured by the microwave reflection intensity measuring unit, the intensity of the microwave reflected from the soil, and the volumetric moisture content of the soil. And a volume moisture content deriving unit for deriving the volume moisture content of the soil,
The resistivity of the soil measured by the resistivity measurement unit, the volume moisture content of the soil derived by the volume moisture content deriving unit, the resistivity of the soil, and the volume moisture content of the soil A dry density deriving unit for deriving the dry density of the soil according to a predetermined second correlation between the dry density of the soil and
The volumetric water content of the soil derived by the volumetric water content deriving unit, the dry density of the soil derived by the dry density deriving unit, the volumetric water content of the soil, and the dry density of the soil And a water content ratio deriving unit for deriving the water content ratio of the soil based on a predetermined third correlation between the soil and the water content ratio of the soil. Further comprising a compaction part for compacting the soil,
The resistivity measuring unit measures the resistivity of the soil after being compacted by the compaction unit;
The soil measurement apparatus according to claim 6, wherein the microwave reflection intensity measurement unit measures the intensity of the microwave reflected from the soil after being compacted by the compaction unit. The compaction part compacts the soil with a compaction machine,
The resistivity measuring unit measures the resistivity of the soil after being compacted by the compaction machine by an electrode disposed at the rear of the compaction machine in the traveling direction;
The microwave reflection intensity measuring unit is reflected from the soil after being compacted by the compacting machine by a microwave irradiator and a microwave measuring instrument arranged at the rear of the compacting machine in the traveling direction. The soil quality measuring device according to claim 7 which measures the intensity of said microwave. The resistivity measuring unit adjusts the resistivity of the soil after being compacted by the compacting machine by adjusting a distance between a pair of the electrodes disposed at the rear of the compacting machine in the traveling direction. Adjust the depth to measure,
The microwave reflection intensity measuring unit reflects from the soil after being compacted by the compacting machine by adjusting an output of the microwave irradiator disposed behind the direction of travel of the compacting machine. The soil measurement apparatus according to claim 8, wherein a depth for measuring the intensity of the microwave is adjusted. The drying density deriving unit includes any one of the positions of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring instrument measured by GNSS (Global Navigation Satellite System) surveying, and the drying density of the soil. And derive
The water content ratio deriving unit associates the position of any one of the compacting machine, the electrode, the microwave irradiator, and the microwave measuring device measured by the GNSS survey with the water content ratio of the soil. The soil quality measuring device according to claim 8 or 9, which is derived.

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