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.