Laboratory testing on an unsaturated soil: equipment, procedures, and first experimental results

被引:51
作者
Rampino, C
Mancuso, C
Vinale, F
机构
[1] Presidenza Consiglio Ministri, Serv Nazl Dighe, Ufficio Napoli, I-80126 Naples, Italy
[2] Univ Naples Federico II, Dipartimento Ingn Geotecn, I-80125 Naples, Italy
关键词
unsaturated soils; equipment layout; silty sand; matric suction;
D O I
10.1139/cgj-36-1-1
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
This paper describes two new apparatuses recently developed at the Universita di Napoli Federico II (Italy) in order to test soils under unsaturated conditions. The related experimental procedures and the first results obtained on a dynamically compacted silty sand are also discussed. The devices mentioned are a Bishop and Wesley stress-path cell and a Wissa oedometer, modified to control matric suction and to measure all the stress-strain variables relevant to unsaturated soil mechanics. Specific experimental procedures were established to perform tests under general conditions and were carefully verified during several tests. Using the triaxial cell, isotropic and anisotropic compression stages were carried out under constant suction levels of 0, 100, 200, and 300 kPa. Furthermore, two deviator stages were performed following different stress paths and water drainage conditions. Using the oedometer, an additional suction level (400 kPa) was investigated during compression tests driven up to 5 MPa of vertical net stress (sigma(v) - u(a)). This research is a part of a major project in progress at the Dipartimento di Ingegneria Geotecnica of Naples; it is aimed at the experimental analysis of the behaviour of several dynamically compacted soils and at the numerical modelling of boundary problems related to earth structures.
引用
收藏
页码:1 / 12
页数:12
相关论文
共 26 条
[1]  
Aitchison G.D., 1961, Pore Pressure and Suction in Soils Conf., organized by British Nat. Soc. Int. Soc. Soil Mech. Found. Eng. At Inst. Civil Eng. London, P47
[2]   A CONSTITUTIVE MODEL FOR PARTIALLY SATURATED SOILS [J].
ALONSO, EE ;
GENS, A ;
JOSA, A .
GEOTECHNIQUE, 1990, 40 (03) :405-430
[3]  
ALONSO EE, 1987, 9TH P EUR C SOIL MEC, V3, P1087
[4]  
American Society for Testing Materials, 1985, 1985 ANN BOOK ASTM S
[5]  
*ASTM, 1991, 1991 ANN BOOK ASTM S
[6]  
*ASTM, 1993, 1993 ANN BOOK ASTM S
[7]  
BALDOVIN G, 1991, P 17 INT C LARG DAMS, V4, P179
[8]  
Bishop A.W., 1963, GEOTECHNIQUE, V13, P177, DOI DOI 10.1680/GEOT.1963.13.3.177
[9]   HYDRAULIC TRIAXIAL APPARATUS FOR CONTROLLED STRESS PATH TESTING [J].
BISHOP, AW ;
WESLEY, LD .
GEOTECHNIQUE, 1975, 25 (04) :657-670
[10]  
Bishop AW, 1959, TEKNISK UKEBLAD, V106, P859