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Gravel soil mechanical property evaluation method

An evaluation method and technology of soil mechanics, applied in soil material testing, material inspection products, etc.

Inactive Publication Date: 2013-01-16
INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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Problems solved by technology

[0005] The purpose of this invention is to provide a method for evaluating the mechanical properties of gravel soil to solve the problem of international versatility in the evaluation of mechanical properties of gravel soil

Method used

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  • Gravel soil mechanical property evaluation method
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  • Gravel soil mechanical property evaluation method

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0032] Specific implementation mode 1: see 1-2, the specific process of a method for evaluating the mechanical properties of gravel soil described in this implementation mode is:

[0033] Step A, correction process of super heavy dynamic penetrating hammer number:

[0034] Step A1. Select a typical gravel soil site, use super heavy dynamic penetrating sounding standard probe and 120kg standard weight to conduct super heavy dynamic penetrating sounding test, test the energy transmitted by the heavy hammer to the drill pipe, and calculate the ratio of the transmitted energy to the theoretical total energy , a total of more than 1200 basic data were obtained;

[0035] Step A2. According to statistics of more than 1200 data, the energy ratio delivered by the 120kg heavy hammer of the ultra-heavy-duty dynamic penetrating test under the conventional operating procedures has an average value of about 90% and a standard deviation of 7.8%;

[0036] Step A3, using super-heavy power pen...

Embodiment

[0055] 1. Adopt super heavy-duty dynamic penetrating probe standard probe ( figure 2 );

[0056] 2. If the ultra-heavy-duty dynamic penetration penetrating 120kg heavy hammer is used, the hammer number obtained from the test will not be corrected for energy;

[0057] 3. If other hammers with different hammering energy are used, it is necessary to measure the transfer energy of the hammer used, and calculate the transfer energy ratio according to the theoretical total energy of the 120kg hammer, which is 1.2kN.m, and perform energy correction according to formula (6) ;

[0058] 4. The number of power penetrating strikes after energy correction N m-120 (stroke / 30cm), the degree of compaction of gravel soil is determined according to Table 1:

[0059] Table 1 Classification of compactness of gravel soil

[0060]

[0061] 5. Using the number of power penetrating strikes after energy correction N m-120 , to judge the liquefaction of gravel soil:

[0062] 1) Calculate the ...

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Abstract

The invention discloses a gravel soil mechanical property evaluation method, relates to the gravel soil extra-heavy dynamic sounding core conversion technology and the international general technology for gravel soil mechanical property evaluation and aims to solve the problem of international generality of gravel soil mechanical property evaluation. The gravel soil mechanical property evaluation method includes: taking a Chengdu plain gravel soil field as a background, adopting an extra-heavy dynamic sounding test standard probe and a 120kg standard heavy punch for field test, establishing a gravel soil liquefaction discrimination model based on extra-heavy dynamic sounding blow counts, putting forward a computational formula, testing effective energy of the heavy punch transferring to a sounding rod, performing statistical analysis of transferred energy ratio of the effective energy to the total energy under standard test, and establishing blow count correction factor suitable for dynamic sounding of various heavy punches. The gravel soil mechanical property evaluation method is simple, convenient, economical and practical in field test means, a gravel soil liquefaction discrimination method is good in reliability, and the constructed dynamic sounding core conversion technology is simple and clear and can provide the domestic and overseas general technology for gravel soil field mechanical property evaluation.

Description

technical field [0001] The invention relates to a method for evaluating the mechanical properties of gravel soil. Background technique [0002] Gravel soil refers to a wide-grade mixed soil composed of gravel, gravel, sand, silt, clay, etc. It is one of the typical soil types in nature and is widely distributed around the world. At present, most earth-rock dams at home and abroad use gravel as a cushion, and artificial gravel materials are increasingly used in the construction of artificial reclamation, highways, railways, etc. The performance and performance of gravel soil under dynamic and static conditions is the key to rock The questions that must be answered in civil engineering are of great significance to ensure the safety of various infrastructures and various projects. [0003] The evaluation of mechanical properties such as modulus, compactness, bearing capacity, and liquefaction discrimination of gravel soil is a problem of great concern in engineering. At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 曹振中袁晓铭
Owner INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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