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Roadbed consolidation degree evaluation method by utilizing single-bridge static sounding test

A technology of static penetrating penetration and evaluation method, which is applied in the direction of infrastructure engineering, roads, roads, etc., can solve the problems of complicated calculation of soil consolidation degree and inconvenient application in engineering practice, and achieve simple construction, reasonable design, step-by-step simple effect

Active Publication Date: 2021-12-24
SOUTHEAST UNIV
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Problems solved by technology

[0003] Technical problem: The technical problem to be solved by the present invention is that the calculation of the degree of soil consolidation based on existing theories and formulas is relatively complicated and inconvenient to be applied to engineering practice. Calculation Method of Consolidation Degree of Subgrade

Method used

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  • Roadbed consolidation degree evaluation method by utilizing single-bridge static sounding test
  • Roadbed consolidation degree evaluation method by utilizing single-bridge static sounding test
  • Roadbed consolidation degree evaluation method by utilizing single-bridge static sounding test

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Experimental program
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Embodiment

[0034] Refer to attached figure 1 .

[0035] Calculation of subgrade consolidation degree using single bridge static penetration test, including the following steps:

[0036] 1) Level the site, mark the position of the single bridge static penetration test point, test point A is located at the shoulder of the road, test point B and test point A are located in the same cross-section and perpendicular to the center line of the subgrade, and the horizontal distance between test point B and the slope foot of the embankment L Greater than 2 times the width of the road base a ;

[0037] 2) The test point A is located at the shoulder of the road. Because of the high strength of the roadbed filling, it is necessary to use the drill hole 2. The depth of the hole 2 is equal to the height of the roadbed. h 1 . Use the single-bridge static penetration probe to press the single-bridge electrical measuring probe vertically and uniformly into the foundation from the guide hole 2, measur...

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Abstract

The invention discloses a roadbed consolidation degree evaluation method by utilizing a single-bridge static sounding test. The method comprises the following steps of: performing a CPT test on a soil layer under a roadbed and a soil layer which is not influenced by roadbed load outside the roadbed by utilizing the static sounding test; calculating the undrained shear strength of the soil layer by utilizing conical tip resistance obtained by the CPT test, thereby obtaining the undrained shear strength increment of the soil layer under the roadbed load effect; and solving the average consolidation degree of the soil layer under the roadbed according to the undrained shear strength increment. According to the method, the average consolidation degree of the roadbed under the roadbed load can be obtained by adopting a CPT test technology, the method is convenient, economic, rapid and accurate, the consolidation characteristics of the soil body are really reflected, and a basis is provided for later settlement prediction of the roadbed or foundation treatment scheme selection of reconstruction and extension projects.

Description

technical field [0001] The invention relates to a roadbed consolidation degree evaluation method based on CPT in-situ testing, and belongs to the technical field of foundation treatment. Background technique [0002] Calculating post-construction settlement of highway soft soil foundation under embankment load is of great significance to road maintenance. In addition, in the widening and reconstruction project of existing roads on soft soil conditions, due to the long-term use of the original roads, the stability of the subgrade settlement is relatively high. After the road is widened, the settlement difference between the old and new subgrades is likely to occur, resulting in uneven deformation of the subgrade , and even produce diseases such as pavement damage. By evaluating the degree of consolidation of the foundation under the embankment and calculating the remaining settlement of the foundation, it can provide technical support for the selection of soft foundation tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/00E02D1/08E01C3/00
CPCE02D1/00E02D1/08E01C3/00Y02A30/60
Inventor 章定文黄平山
Owner SOUTHEAST UNIV
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