Abstract
The ground investigated in this research had been treated by Flyash-Gypsum-Cement (FGC) using Deep Mixing Method in order to get high resistance against heaving and lateral deformation. Cone penetration test (CPT), pressuremeter test, and seismic velocity logging test (VST) were carried out on the treated ground. Further, laboratory unconfined compression test (UCT) of the treated soil was also performed using the samples retrieved from rotary triple tube sampler (RTS).
This paper discusses the applicability of these in-situ testing methods, in combination with laboratory test, in evaluating the engineering properties of the treated ground. The results of shear strengths obtained by CPT and UCT have been compared. It is found that in combination with laboratory testing, CPT testing is capable of properly evaluating the strength of a treated soil. The value of modulus of rigidity and shear strength of samples obtained from RTS are smaller than that from in-situ tests, indicating that these samples might have been disturbed.
