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Abstract In order to study the strength and deformation properties of soft rock composed of coarse-grained soil，as well as its reinforcement effect as fillings，large-scale consolidated drained and undrained triaxial tests are carried out for reinforced intense-weathered rock. The results show that the stress-strain relationship of geotextile-reinforced fillings is of strain hardening. The geotextile-reinforced fillings have little effect while the triaxial strain is less than 1%，and the reinforcing effect becomes more remarkable with the increase of triaxial strain. The pore water pressures of geotextile-reinforced soil samples are higher than those of pure coarse-grained soil samples；and they increase with the increase of geotextile layers. The coefficients of reinforcing effect are all more than 1.0，being 1.09–1.21 while with one layer of geotextile；1.30–1.71 with two layers of geotextile and 1.31–1.72 with three layers of geotextile. The internal friction angle j of fillings before and after reinforcements is nearly constant，while the cohesion force of the fillings increases with the increase of geotextile layers. The constitutive relation can be described with the Duncan-Chang model；and the parameters of Duncan-Chang model for geotextile-reinforced soil are obtained through tests.
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Received: 10 August 2009
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