JP2005331288A - Display method of soil constitution based on cone penetration test - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display method of a soil constitution by a CPT capable of displaying data of a field test by the CPT and the soil constitution by soil determination on the basis thereof, intelligibly to a user. <P>SOLUTION: In this display method of the soil constitution on the basis of the CPT, the soil constitution is displayed by colored pole-shaped 1a and 1b formed by accumulating and plotting soil properties discriminated at each measuring depth on the basis of data of a tip resistance, an interval water pressure and a circumferential friction acquired by the CPT, in different colors relative to each soil property in the measuring depth direction from the surface layer, and a legend 2 of the soil property colors is also displayed. The data of the tip resistance, the interval water pressure and the circumferential friction can be displayed together. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention organizes the results of the electric static cone penetration test (hereinafter referred to as “CPT”) and displays the soil soil texture on the color column in different colors for each soil texture to provide information on the soil soil composition. The present invention relates to a display method of soil composition based on CPT that can be easily communicated.

  CPT is used for ground investigation. CPT statically penetrates the cone into the ground and measures the tip resistance, pore water pressure, and circumferential friction acting on the cone, and evaluates the characteristics of the ground from the measurement results (Patent Document 1, Non-Patent Document). 1).

  For example, a Robertson discrimination method is used to organize soil determination results obtained from measurement data obtained by CPT.

FIG. 3 is a table showing the soil determination results by the Robertson determination method and a table showing the soil determination results. As shown in FIG. 3, 10 in the “Bq-qt method” diagram and 11 in the “fs / qt-qt method” diagram showing the soil discrimination results by the Robertson discrimination method are shown in Table 12 of the soil discrimination results. Document No. And “Bq-qt method” and “fs / qt-qt method” are compared, and the material No. (1), (2), (3) ... (indicated by circled numbers in Fig. 3) are plotted in the corresponding zones of 10 and 11 in the figure to determine the soil. .
JP 2004-55555 A Geotechnical Society Standard (JGS 1435-1995) Electrical Static Cone Penetration Test Method

  However, in the figure of the “Bq-qt method” and the figure of the “fs / qt-qt method”, the document No. When plotting (1), (2), (3)..., The soil quality at a specific depth is shown in the document No. As can be seen from the above, in order to know the soil composition of the entire survey depth, document no. Since (1), (2), (3), etc. must be followed in order, it took time and effort to grasp them.

  In addition, as the investigation depth increased, Document No. As the number increases, document no. It becomes difficult to plot so that does not overlap. Therefore, the blocks are divided into 5 to 10 m depths, and a “Bq-qt method” diagram and a “fs / qt-qt method” diagram are prepared for each block. In addition to the time and effort required to plot the graph, it was difficult to see and understand because there were multiple figures.

  As described above, the method using the Robertson discrimination method has a drawback in that the discrimination result for each measurement data cannot be expressed in an easy-to-understand manner for the user.

  Therefore, the present invention provides a method for displaying a soil composition by CPT that can easily display to the user the data of the field test by CPT and the soil composition by soil judgment based on the data.

  According to the CPT-based soil composition display method of the present invention, the soil quality determined at each measurement depth based on the tip resistance, pore water pressure, and circumferential friction data obtained by the CPT is determined for each soil in the measurement depth direction from the surface layer. The soil structure is displayed by a color columnar diagram drawn and accumulated in different colors, and a legend of the soil color is displayed.

  In the above configuration, data on tip resistance, pore water pressure, and peripheral surface friction can be displayed together.

  In the display method of the soil composition based on the CPT according to the present invention, the soil texture is determined empirically from the changes in the tip resistance, pore water pressure, and peripheral surface friction at fine intervals in the depth direction (generally every 2 cm) obtained by the CPT. By displaying the soil composition in a colored columnar diagram that is drawn and accumulated in different colors for each soil, it is possible to easily grasp by visual observation about the survey soil depth or the entire soil structure. Soil information applied to architectural design can be accurately and easily communicated to users.

  FIG. 1 is a diagram showing an example of display by a color column diagram of a soil composition obtained by the soil composition display method based on the CPT of the present invention. Although FIG. 1 is displayed in black and white, it is actually displayed in color.

  In FIG. 1, the color columnar diagram based on the CPT includes a soil color columnar diagram 1a obtained by the “Bq-qt method” of the Robertson discrimination method and a soil column obtained by the “fs / qt-qt method”. Displayed in the columnar diagram 1b. The color columnar diagram of the soil does not necessarily display both the color columnar diagrams 1a and 1b, and may display one of the color columnar diagrams 1a by, for example, the “Bq-qt method”. In addition, a soil legend 2 in which the soil and the color correspond is displayed.

  The soil colors displayed in the color column diagrams 1a and 1b and the legend 2 are generally expressed in the blue soil, the yellow soil, and the gravel soil in the amber system in the soil survey. It is easy to understand following this display. Although the soil legend 2 is displayed horizontally in FIG. 1, it may be displayed vertically next to the soil color column diagrams 1a and 1b.

  Each of the columnar diagrams 1a and 1b is obtained by accumulating thin horizontal lines of colors corresponding to the soil quality corresponding to the soil quality discrimination result based on data obtained every 2 cm, for example. Gather and look like a band.

  In addition to the soil color column, as shown in FIG. 1, a graph indicating test results of tip resistance, pore water pressure, and circumferential friction may be displayed next to the color column in accordance with the measurement depth.

  Next to the colored columnar figures 1a and 1b, a graph of the tip resistance created by measuring the tip resistance (qt), circumferential friction (fs) and pore water pressure (Ud) obtained from the CPT according to the investigation depth is obtained. 3, the peripheral friction (fs) graph 4 and the pore water pressure (Ud) graph 5 may be displayed. The characteristics of soil properties at a specific depth can be grasped from the color columnar diagrams 1a and 1b and the graphs 3, 4 and 5 created according to the measurement depth.

  FIG. 2 is a flowchart for creating a color column having a soil structure by CPT according to the present invention.

(1) The tip resistance, pore water pressure, and circumferential friction are measured at predetermined intervals (generally 2 cm intervals) by the CPT test (step 1).

(2) The data obtained by CPT is processed to obtain the tip resistance (qt), the pore water pressure ratio (Bq), and the friction ratio (fs / q ₁ ) (step 2).

(3) Each relational value of “Bq-qt method” and “fs / qt-qt method” is obtained, and soil quality is automatically determined on the Robertson chart diagram coordinated on the personal computer (step 3).

(4) Select a color line corresponding to the soil quality. As for the color lines, for example, viscous soil is set to blue, sand is set to yellow, and gravelly soil is set to amber, which are generally used in ground surveys (step 4).

(5) Processing is performed for each measured value from the surface layer to the survey seismic intensity, and the color is accumulated and drawn from the surface layer in the survey depth direction to create a color column diagram (steps 5 and 6).

  The created soil structure can be displayed on a personal computer display or output and displayed on a sheet.

  The present invention can be applied to civil engineering and architectural design because the soil quality discriminated from changes in the tip resistance, pore water pressure, and circumferential friction in the depth direction obtained by CPT can be visually grasped by a color column diagram. be able to.

It is a figure which shows an example of the display of the soil structure by this invention. It is a figure which shows the creation flow of the color columnar figure by CPT of this invention. It is the table | surface which shows the figure which displayed the soil quality discrimination | determination result by Robertson discrimination method, and the soil quality discrimination | determination result.

Explanation of symbols

1a, 1b: Colored column diagram 2: Soil legend 3: Tip resistance graph 4: Surface friction graph 5: Pore water pressure graph

Claims (3)

  A color columnar diagram in which the soil quality discriminated at each measurement depth based on the data on tip resistance, pore water pressure, and circumferential friction obtained by CPT is drawn and accumulated in a different color for each soil quality from the surface layer to the measurement depth direction. A method for displaying a soil composition based on an electric static cone penetration test, wherein the soil composition is displayed and a legend for the color of the soil is displayed.   The color column diagram is a soil color column diagram obtained by the “Bq-qt method” of the Robertson discrimination method and / or a soil color column diagram obtained by the “fs / qt-qt method”. The display method of the soil composition based on the electric static cone penetration test of Claim 1 to do. 3. A method for displaying a soil composition based on an electric static cone penetration test according to claim 1, wherein data on tip resistance, pore water pressure, and circumferential friction are displayed together.

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