Abstract: The seismic dilatometer test (SDMT) has additional shear wave velocity testing module in the conventional flat dilatometer probe. The SDMT device can acquire the dynamic shear modulus and shear wave velocity of soil, and greatly improve the capability of in-situ testing methods for the characterization of subsurface soils. As another popular in-situ test method, the cone penetration test (CPT) has been widely used in the geotechnical engineering investigation of various soils. It is particularly important to compare and to evaluate the test parameters obtained from both methods. Parameters such as, compression modulus, undrained shear strength, internal friction angle and shear wave velocity of soil, are obtained from the SDMT. The tip resistance (q_t), sleeve frictional resistance (f_s) and piezocone resistance (q_c) are collected from the CPT. Pore pressure distribution (u_c) was also determined piezocone module of a CPT device. On this basis, combined with the conventional soil boring, the site soil stratigraphy can be accurately characterized as predominantly silty sand to sandy soils. This paper presents a comprehensive evaluation of the results from SDMT and CPT. Both advantages and disadvantages of these methods are discussed extensively.

Key words: Seismic Dilatometer Test in Expansive Soils, Cone Penetration Test, Over-Consolidated Soils, In-situ Tests