Browsing by Author "LIAO, JJ"

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AN EMPIRICAL STRENGTH CRITERION FOR JET GROUTED SOILCRETE
(1994-09-01)
FANG, YS
;
LIAO, JJ
;
SZE, SC
;
交大名義發表
;
土木工程學系
Based on experimental data, this paper presents an empirical strength criterion for jet grouted soilcrete. Cylindrical specimens drilled from construction sites were tested to investigate the strength characteristics of soilcrete. Experiments conducted include the uniaxial compression test, Brazilian test and the triaxial compression test. It was found that soilcrete density increases with increasing depth. The uniaxial compressive strengths obtained were significantly greater than the design values suggested by the JSG Association of Japan. Experimental Poisson's ratios varied from 0.12 to 0.22, which are closer to that for concrete than that for native soil. Based on test results, a parabolic-type empirical criterion tau(ff) = N.sigma(ff) + T(o))M is proposed to describe the strength behaviour of soilcrete under low and tensile stress regions.
GRAVITATIONAL STRESSES IN ANISOTROPIC RIDGES AND VALLEYS WITH SMALL SLOPES
(1992-03-10)
LIAO, JJ
;
SAVAGE, WZ
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AMADEI, B
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土木工程學系
;
Department of Civil Engineering
We present an approximate analytical solution for the effects of topography on near-surface gravity-induced stresses in symmetric anisotropic ridges and valleys. The solution can be used for laterally constrained ridges and valleys consisting of isotropic, transversely isotropic. or orthotropic rock with horizontal or vertical layers. A parametric study on the effect of anisotropy type and degree of rock anisotropy on gravity-induced stresses is presented. The magnitude of the predicted stresses is of the order of the characteristic stress rho-gH, where H is the height of the ridge or depth of the valley. The approximate solution is limited to ridges and valleys with small slopes not exceeding 10%.
MECHANICAL-PROPERTIES OF JET GROUTED SOILCRETE
(1994-08-01)
FANG, YS
;
LIAO, JJ
;
LIN, TK
;
交大名義發表
;
土木工程學系
To investigate the mechanical properties of jet grouted soilcrete, uniaxial compression tests, Brazilian tests and ultrasonic tests were conducted on a number of samples. It was found that the uniaxial compressive strength, modulus of elasticity, failure strain, tensile strength and P-wave velocity of soilcrete increase with increasing dry density. Dry density should be one of the critical criteria to control the quality of jet grouting. Significant variation of strength was monitored for soilcrete from the same depth because of the non-uniform mix of soil and grout with a high-pressure jet. The maximum axial and lateral strain at failure were found to be 0.62% and 0.20%, respectively. These values are relatively close to the failure strains for concrete, rather than for soil. The Brazilian tensile strength varied between 1/10 and 1/30 of the uniaxial compressive strength.