Abstract:

In order to provide reliable basis for foundation bearing capacity of Changchun hard plastic old clay and to discuss appropriate measures for determining the characteristic value of subsoil bearing capacity, laboratory soil test and in-situ testing methods including loading test and cone penetration test(CPT) are carried out,  and the characteristics value of subsoil bearing capacity (306-425 kPa), the value of CPT(1.9-3.3 MPa), natural void ratio (0.63-0.72) and liquidity index (0.02-0.25) are collected. Based on the test data, there can be found a linear correlation between characteristic value of subsoil bearing capacity and the value of CPT, between characteristic value of subsoil bearing capacity and natural void ratio and between characteristic value of subsoil bearing capacity and liquidity index. Therefore, an empirical formula is presented, which the characteristic value of subsoil bearing capacity can be calculated according to the value of CPT. And then a calculation table about the characteristic value of subsoil bearing capacity of Changchun old clay is summed up according to the laboratory soil test indexes.

Key words: hard plastic old clay, foundation bearing capacity, loading test, cone penetration test(CPT), soil test