Macroscopic method capable of distinguishing expansibility grade of soil mass during construction

An expansive, in-construction technology, applied in the industrial field, can solve the problems of waste, time-consuming and labor-intensive, and achieve the effects of easy operation, significant economic benefits, and good engineering application effects.

Inactive Publication Date: 2016-11-23
CHANGJIANG SURVEY PLANNING DESIGN & RES +1
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Problems solved by technology

[0011] Many of the above indicators reflect the expansion performance of the soil from a certain angle, but testing all indicat

Method used

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  • Macroscopic method capable of distinguishing expansibility grade of soil mass during construction

Examples

Experimental program
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Effect test

example 1

[0126] [Example 1] Xichuan 2 standard Q 1 Soil identification

[0127] Landform: Ridges and hills, with a score of 7

[0128] Strata: Q 1 , with a score of 7.5

[0129] Lithology: silty clay, scoring 5

[0130] Fissures: 4 pieces / m, scoring 6.5

[0131] Color: brick red, score 8

[0132] Calcareous nodules: below the nodule-enriched layer, score 6

[0133] Excavation features: the excavation surface is uneven, there are many slag blocks, and the score is 6

[0134] Hydrogeology: few seepage points, high water content, score 9

[0135] The comprehensive score is 6.88, which is located in the middle expansive soil range of 5-7 points, and tends to be strong expansive soil. Take 3 groups of soil samples at the corresponding positions and carry out simultaneous indoor tests according to the test procedures stipulated in the "Soil Engineering Test Regulations" (SL237-1999). The free expansion rate of the test is 70%-85%. 2013) The criterion for expansive soil is medium exp...

example 2

[0136] [Example 2] Nanyang 2 Stake No. 95+200 Horse Road Q 2 Discrimination of expansive soil

[0137] Landform: Ridges and hills, with a score of 7

[0138] Strata: Q 2 , with a score of 6.5

[0139] Lithology: silty clay, scoring 5

[0140] Fissures: 2 pieces / m, 5 points

[0141] Color: Tan, Score 4

[0142] Calcareous nodules: sporadic distribution, score 3

[0143] Excavation features: the excavation slope is generally flat, with occasional bumps, and the score is 4

[0144] Hydrogeology: broken line, 5

[0145] The comprehensive score is 4.95, which is located in the weak expansive soil range of 2-5 points, and is biased towards medium expansive soil. The soil samples at the corresponding positions were taken to carry out simultaneous indoor tests according to the test procedures stipulated in the "Soil Test Regulations" (SL237-1999), and the free expansion rate of the test was 57%. The criterion for discrimination is weak equal expansion. The results of on-site...

example 3

[0146] 【Example 3】Nanyang 2 Stake No. 95+200 Canal Floor Q 2 Discrimination of expansive soil

[0147] Landform: Ridges and hills, with a score of 7

[0148] Strata: Q2, assigned a score of 6.5

[0149] Lithology: clay, scoring 8.5

[0150] Fissures: 9 pieces / m, 10 points

[0151] Color: blue gray, score 9

[0152] Calcareous nodules: below the nodule layer, score 6

[0153] Excavation features: the excavation surface is uneven, the slag is lumpy, and the score is 10

[0154] Hydrogeology: No obvious seepage, the soil is hard-plastic-plastic, and the score is 9

[0155] The comprehensive score is 8.42, which is located in the strong expansive soil range of 7-10 points. The soil samples at the corresponding positions were taken to carry out simultaneous indoor tests according to the test procedures stipulated in the "Geotechnical Test Regulations" (SL237-1999), and the free expansion rate of the test was 95%. Criterion for the strong iso-expansion. The results of on-si...

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Abstract

The invention discloses a macroscopic method capable of distinguishing expansibility grade of soil mass during construction. The method is characterized in that before project implementation, a representative sample in a work area is selected and is subjected to an indoor test of a free swelling ratio, the relation among the expansibility, the lithological character, the soil mass structure, colors, crack development characteristics and the like is established, and the accuracy and the scientificity of on-site rapid distinguishing are realized; a macrocontrol index for rapid distinguishing of the expansibility grade of the soil mass is selected, and classified description and research of a control index are carried out; a soil mass expansibility distinguishing model is established, the weight of each influence factor is determined, besides, an indoor verification test is carried out, and the reliability of the model and the accuracy of the test are improved; rapid distinguishing work of the expansibility grade of the soil mass in the work area is performed on site according to the soil mass expansibility distinguishing model. The defects that a treatment scheme and treatment strength cannot be adjusted timely in the implementation process of a project according to the expansibility grade in the prior art are overcome, and the method has the advantages of capability of rapidly distinguishing expansive soil in the on-site construction process.

Description

technical field [0001] The invention belongs to the technical fields of geotechnical engineering, engineering geology and water conservancy and hydropower engineering; more specifically, it is a macroscopic method capable of discriminating the grade of soil expansibility during construction. Background technique [0002] Expansive soil is a special kind of rock and soil, mainly composed of montmorillonite, illite, kaolin and other strongly hydrophilic clay minerals, which are characterized by multiple cracks, super-consolidation, strong hydrophilicity, repeated expansion and contraction, etc. . It is a special clay that absorbs water, swells, softens, loses water, shrinks and cracks, which can easily lead to structural engineering such as channels, railways, road slopes, houses, underground chambers, tunnels, etc., resulting in large deformation, cracking, and landslide damage. , with multiple repetitions and long-term potential hazards. [0003] The identification and cla...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01N33/24
CPCG01N33/24G16Z99/00Y02A90/10
Inventor 蔡耀军阳云华王小波朱瑛洁李亮强鲁斌张胜军
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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