This standard is applicable to the basic engineering properties test of foundation soil and filling soil materials for various types of projects such as industrial and civil construction, water conservancy, transportation, etc. GB/T 50123-1999 Geotechnical Test Method Standard GB/T50123-1999 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T50123—1999
Standard for soil test method
Standard for soil test methodChina Construction Information Network
19990610
1999—10—01
State Administration of Quality and Technical Supervision
Ministry of Construction of the People's Republic of China
Jointly issued
National Standard of the People's Republic of China
Standard for soil test method
Standard for soil test method methodGB/T50123—1999
Editing department: Ministry of Water Resources of the People's Republic of ChinaApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: October 1, 1999
China Construction Information Network
1999Beijing
Notice on the release of the national standard
"Standard for geotechnical test methods"
Construction Standard [1999] No. 148
According to the requirements of the State Planning Commission's "1994 Engineering Construction Standard Quota Formulation and Revision Plan (Annex 9 to Document No. 1994240 of the State Planning Commission), the "Standard for geotechnical test methods" revised by the Ministry of Water Resources and relevant departments has been reviewed and approved as a recommended national standard by relevant departments, with the number GB/T50123-1999, and will be implemented on October 1, 1999. The original national standard "Standard for geotechnical test methods" GBJ123-88 will be abolished at the same time. This standard is managed by the Ministry of Water Resources, the Nanjing Hydraulic Science Research Institute is responsible for the specific interpretation work, and the Standard and Quota Research Institute of the Ministry of Construction organizes the China Planning Press to publish and distribute it. China Construction Information Network
Ministry of Construction of the People's Republic of China
June 10, 1999
This standard is based on the spirit of the National Planning Commission's Comprehensive Document No. 1994240. It was revised by the Nanjing Hydraulic Science Research Institute in conjunction with relevant units on the basis of the national standard "Standard for Geotechnical Test Methods" GBJ123-88 promulgated in 1988. During the revision process of this standard, domestic and foreign data were collected, and research and discussion were carried out repeatedly. In combination with the needs of domestic engineering development, a discussion draft and a draft for soliciting opinions were proposed on this basis. After extensive solicitation of opinions, a draft for submission was proposed after multiple revisions. Finally, it was finalized after expert review.
This standard consists of 35 chapters and four appendices. It supplements and modifies the original standard, and adds seven tests and one method compared with the original standard. The main contents are: 1. According to the provisions of the national legal measurement units, some nouns and measurement units of chemical tests are modified, and a chapter on terms and symbols is added. 2. In the physical test items, some test methods are supplemented and modified, such as the determination of frozen soil moisture content in the moisture content test, and the salt washing step is added to the particle analysis test. In addition to supplementing some tests, the mechanical test items have added the rebound modulus test and the strain-controlled continuous loading consolidation test (the research results of the topic after the promulgation of GBJ123-88). The bearing ratio test, the Huangshi collapsibility test and the chemical test of soil have been greatly modified in terms of methods.
4. Added physical tests for frozen soil samples, including frozen soil density test, freezing temperature test, unfrozen moisture content test, thermal conductivity test, frost heave test and frozen soil melting compression test.
5. Each test record sheet is included in Appendix D
The appendix includes the collation of test data and test reports: sample requirements and management, and general requirements for indoor main instruments to ensure the accuracy and reliability of test data. Appendix D is a record sheet for each test for reference. This standard is managed by the Ministry of Water Resources, and the Nanjing Hydraulic Science Research Institute is responsible for the specific interpretation. It is hoped that all units will pay attention to accumulating experience during use, and send suggestions and opinions to the Nanjing Hydraulic Science Research Institute (address: No. 223 Guangzhou Road, Nanjing: Postal Code 210029) for reference in future revisions. Editor-in-chief, participating units and main drafters of this standard Editor-in-chief: Nanjing Hydraulic Research Institute Participating units: The First Surveying and Design Institute of Ministry of Railways Lanzhou Institute of Cryogenics and Geocryology, Chinese Academy of Sciences Northeast Survey and Design Institute of Ministry of Water Resources
China Academy of Building Research
Institute of Highway, Ministry of Transport
Main drafters: Sheng Shuxin, Wu Lianrong, Xu Yizu, Xu Bo, Meng Gemingli, Rao Hongyan, Tao Xiuzhen
China Construction Information Network
2 Terms and symbols
2.1 Terms:
2.2 Symbol*.
3 Sample preparation and saturation
3.1 Sample preparation
3.2 Sample saturation
4 Water content test
5 Density test
5.1 Ring knife method
5.2 Wax sealing method
Water filling method
Sand filling method
6 Soil particle specific gravity test
Weight bottle method
6.3 Floating weighing method
6. Siphon tube method
Particle analysis test
Sieve analysis method
Densitometer method| |tt||Pipette method
8 Limit moisture content test
8.1 Combined determination method of liquid and plastic limit
Disc instrument liquid limit test
8.3 Rolling method plastic limit test
8.4 Shrinkage limit test by shrinkage blood method
9 Relative density test of sand
9.1 General provisions
Minimum dry density test of sand
9.3 Maximum dry density test of sand
Compaction test
Bearing ratio test
12 Rebound modulus test
Lever pressure instrument method·
Strength instrument method
13 Permeability test
General provisions
13.2 Constant head permeability test
13.3 Variable head permeability test
14 Consolidation test…
14.1 Standard consolidation test
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14.2 Strain-controlled continuous loading consolidation test 15 Loess moisture barrier test
Sinkage coefficient test·
Body weight wetting coefficient test
Dissolution and filtration Deformation coefficient test...
Slump start pressure test..
Triaxial compression test
General provisions
Instruments and equipment
Specimen preparation and saturation:
Unconsolidated undrained shear test"
Consolidated undrained shear test
Consolidated drained shear test
(48)
Multi-stage loading test of individual specimens
17 Unconfined compressive strength test
18 Direct shear test
Slow shear test||tt| |Consolidation quick shear test
Quick shear test
Direct shear test of sand
Repeated direct shear strength test
Free expansion rate test
Expansion rate test
Load expansion rate test
Unload expansion rate test
Expansion force test
23 Contraction test
24 Frozen soil density test
General provisions
Floating weighing method
Combined test
Freezing temperature testbzxz.net
Day Frozen moisture content test
27 Frozen soil thermal conductivity test
28 Frost heave test
29 Frozen soil thawing compression test
General provisions
29.2 Indoor frozen soil thawing compression test
29.3 On-site frozen soil thawing compression test
30 Acidity and alkalinity test
Soluble salt test
Preparation of leachate
Determination of total soluble salt
Determination of carbonate and bicarbonate
Determination of chloride||tt| |Determination of sulfate
Determination of sulfate
Determination of calcium ion
Determination of magnesium ion
EDTA complex volumetric method·…
Turbidimetric method
Atomic absorption spectrophotometric determination of calcium and magnesium ionsDetermination of sodium and potassium ions
Medium soluble salt (stone sound) test
33Poorly soluble salt (calcium carbonate) test
34Organic matter test
35Centrifugal water equivalent test of soil
Appendix A Arrangement of test data Appendix B Requirements and management of soil samples
Appendix C General requirements for indoor air conditioners
Appendix D Records of various tests
Terms used in this standard
China Construction
1 General
1.0.1. This standard is specially formulated to determine the basic engineering properties of soil, unify the test methods, and provide reliable parameters for engineering design and construction. 1.0.2 This standard is applicable to the basic engineering properties test of foundation soil and filling soil materials for various types of projects such as industrial and civil construction, water conservancy, transportation, etc. 1.0.3 In this standard, soil is divided into only two categories: coarse-grained soil and fine-grained soil. The name of the soil shall be determined according to the current national standard "Soil Classification Standard" GBI145. 1.0.4 The collation of geotechnical test data shall estimate the characteristics of the soil unit and its change rules through the study of samples (test data), so that the results of geotechnical tests can provide accurate and reliable geotechnical indicators for engineering design and construction. The analysis and collation of test results shall be carried out according to Appendix A.
1.0.5 The instruments and equipment of geotechnical test departments shall be adopted in accordance with the current national standard "Basic Parameters and General Technical Conditions of Geotechnical Instruments" GB/T15406, and shall be regularly inspected and calibrated according to the current relevant regulations.
6 In addition to complying with this standard, soil test methods shall also comply with the provisions of the current mandatory national standards.
2 Terms and symbols
2.1.1 Acidity and alkalinity Negative logarithm of the hydrogen ion concentration in a solution.
2.1.2 Calibration
A set of operations to determine the relationship between the indication of a measuring instrument or measuring system or the value represented by a physical measuring tool and the corresponding known value of the measured object under specified conditions. 2.1.3 Effective stress path The trajectory of the change of effective stress on a plane in the body during the compression process of the body. 2.1.4 Freezing temperature Freezing temperature The highest temperature at which pore water in the soil freezes. 2.1.5 Joadmeter
Steel ring or load sensor used in strength test tree. 2.1.6
Load rate
The ratio of the increment of a certain level of simple load to the total amount of the previous level of load. 2.1.7 Parallel measure
Under the same conditions, two or more specimens are used to test simultaneously. 2.1.8 Shear strength parameters parameters of shear strength Indicators that characterize the shear performance of soil, including cohesion and internal friction angle. 2.1.9 Pure water
Deaerated water and ion exchange water.
2.1.10 Soil specimen
Representative soil specimen used for testing. 2.1.11
Saturated soil
Soil specimen whose pore volume is completely filled with water. 2.1.12 Suspension
A mixture of soil particles and water.
2.1.13 Test
A technical operation to test one or more properties of a given specimen according to a prescribed procedure.
2.1.14 Thermal conductivity The thermal conductivity is an indicator of the thermal conductivity of the soil.
2.1.15 Thaw compressibility coefficient The relative compression deformation produced by unit pressure after the frozen soil melts. 2.1.16 Thaw-settelment coefficient The relative amount of settlement produced by the action of self-soil force during the thawing process of frozen soil. 2.1.17 Unfrozen-water content The ratio of the mass of unfrozen water in frozen soil to the mass of dry soil at a certain negative temperature, expressed as a percentage.
2.1.18 Verification
Provide proof through testing to confirm that the specified requirements are met. 2.2 Symbols
Through time
Cross-sectional area of ​​sample
Average diameter of sample
Diameter of soil particles
Height of sample
Volume of sample
Physical index
Curvature coefficient
Inhomogeneity coefficient
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