AS-1289.6.7.2-2001.pdf
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1、AS 1289.6.7.22001 (Incorporating Amendment No. 1) Standards Australia 1 Australian Standard TM Methods of testing soils for engineering purposes Method 6.7.2: Soil strength and consolidation testsDetermination of permeability of a soil Falling head method for a remoulded specimen This Standard incor
2、porates Amendment No. 1(January 2003). The changes required by the Amendment are indicated in the text by a marginal bar and amendment number against the clause, note, table, figure or part thereof affected. 1 SCOPE This Standard sets out a method for determining the coefficient of permeability for
3、the flow of water through a remoulded specimen under the influence of a falling head of water (see Note 1). The method is suitable for soils with coefficient of permeability of about 107 to 109 metres per second. 2 REFERENCED DOCUMENTS The following documents are referred to in this Standard: AS 115
4、2 Specification for test sieves 1289 Methods of testing soils for engineering purposes 1289.1.1 Method 1.1: Sampling and preparation of soilsPreparation of disturbed soil samples for testing 1289.2.1.1 Method 2.1.1: Soil moisture content testsDetermination of the moisture content of a soilOven dryin
5、g method (standard method) 1289.5.1.1 Method 5.1.1: Soil compaction and density testsDetermination of the dry density/moisture content relation of a soil using standard compactive effort 1289.5.2.1 Method 5.2.1: Soil compaction and density testsDetermination of the dry density/moisture content relat
6、ion of a soil using modified compactive effort 1289.5.5.1 Method 5.5.1: Soil compaction and density testsDetermination of the minimum and maximum dry density of a cohesionless materialStandard method 1289.6.7.1 Method 6.7.1 Soil strength and consolidation testsDetermination of permeability of a soil
7、Constant head method for a remoulded specimen 1289.6.7.3 Method 6.7.3: Soil strength and consolidation testsDetermination of permeability of a soilConstant head method using a flexible wall permeameter 3 DEFINITIONS 3.1 Laboratory density ratio The ratio of the dry density of the compacted specimen
8、to the maximum dry density of the material as determined by AS 1289.5.1.1, AS 1289.5.2.1 or AS 1289.5.5.1, as applicable, expressed as a percentage. AS 1289.6.7.2 Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007 AS 1289.6.7.22001 Standards Australia .au 2 3.2 Laboratory moisture ratio The ratio
9、 of the moisture content of the compacted specimen to the optimum moisture content of the material as determined from AS 1289.5.1.1 or AS 1289.5.2.1, as applicable, expressed as a percentage. 3.3 Hydraulic gradient The difference in hydraulic head between the top and the bottom of the specimen, divi
10、ded by the specimen thickness. 4 APPARATUS The following apparatus is required: (a) Permeameter cylinder and collar of rigid corrosionresistant material having a diameter meeting the requirements as shown in Table 1. The height of the mould shall be sufficient to include the test specimen of height
11、greater than 5 times the maximum particle size for testing, porous plates and surcharges. The height of the specimen shall be not less than 50 mm. TABLE 1 PERMEAMETER CYLINDER DIAMETER Maximum particle size for testing mm Minimum cylinder diameter mm 5 50 10 100 20 150 40 200 (b) Permeameter basepla
12、te containing suitable inlets and outlets to allow water to flow through the specimen and a suitable spacer disc to ensure there is room for the surcharges in the mould after the specimen has been compacted. (c) Rigid porous discs for containment of the specimen within the cylinder and allowing free
13、 flow of water. The disc placed on top of the specimen may contain a hole of about 25 mm diameter. The maximum flow capacity of the apparatus shall be known. NOTE: The flow capacity can be measured using the assembled apparatus under test conditions without a specimen. (d) A system for applying a co
14、nfining axial load to the specimen or surcharges. (e) Standpipe assembly with a standpipe of known cross-sectional area and a ruler graduated in millimetres. (f) Timer that reads in minutes. (g) Balance of adequate capacity having a limit of performance not exceeding 1 g. (h) Thermometer graduated t
15、o 1C or less with an uncertainty not exceeding 0.5C. (i) Fast flow filter paper discs appropriate to the diameter of the mould. (j) Microcrystalline wax or similar material of known density, and waxing apparatus to line the inside of the mould. Accessed by TAFE QUEENSLAND INSTITUTES on 04 Dec 2007 A
16、S 1289.6.7.22001 .au Standards Australia 3 (k) Sieves of suitable sizes for example 37.5 mm, 19.0 mm, 9.50 mm, 4.75 mm complying with AS 1152, for material being tested. (l) Measurement device for determining the height of specimen to the nearest 1 mm or measured moulds and spacers. (m) Vacuum evacu
17、ation apparatus to assist in saturation of the specimen. 5 PREPARATION OF THE TEST PORTION Prepare the test portion as follows: (a) Using the sieve appropriate to the maximum size (e.g. the 19 mm sieve for 20 mm nominal maximum size), sieve a representative sample of the soil prepared in accordance
18、with the procedure prescribed in AS 1289.1.1. Determine the percentage of material retained on the sieve and discard it (see Note 2). (b) Obtain, by riffling or quartering the sieved material, a representative test portion of the soil to enable the manufacture of the specimen in the mould. (c) Dampe
19、n the test portion or dry at not more than 50C to achieve the required laboratory moisture ratio. Thoroughly mix the test portion to ensure the moisture is uniform throughout the portion. (d) Allow the soil test portion to cure for an appropriate time for the soil type (see Note 3). Record the durat
20、ion of curing. 6 PREPARATION OF THE TEST SPECIMEN Prepare the test specimen as follows: (a) Saturate the porous discs in water under vacuum for at least 1 h prior to use. Store the discs in water between tests. (b) Apply a thin layer of wax to the side of the mould to prevent piping of water between
21、 the mould and the specimen. The amount of wax on the side of the mould shall be taken into account when calculating the volume of the specimen. (c) Insert the spacer disc, clamp the mould (with the extension collar attached) to the baseplate, and place a coarse filter paper on top of the spacer dis
22、c. (d) Immediately prior to compaction, thoroughly mix the cured soil and determine the moisture content (w1) of a representative fraction of the test portion, as prepared in Clause 5, in accordance with AS 1289.2.1.1. The soil shall be compacted within 5% of the laboratory moisture ratio specified.
23、 (e) Compact the specimen in the mould (see Note 4) in equal layers (within 5 mm) to achieve the required laboratory density ratio within 1% using the appropriate compaction rammer and layers (see AS 1289.5.1.1 and AS 1289.5.2.1) depending on the compactive effort specified. Ensure that material is
24、not segregated and that each layer is scarified about 2 to 5 mm prior to the compaction of the next layer. (f) Free the material from around the inside of the collar and carefully remove the collar. (g) While the baseplate is still attached, ensure the surface of the compacted specimen is level with
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- AS 1289.6 7.2 2001
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