Through the standard penetration test (SPT) the plug behavior of PHC piles in silty sand and the influence to the characteristics of the soil around PHC pile by driving or jacking methods are studied.

In this paper,the case studies of two tall buildings built on silty sand improved by vibro- replacement stone column in Hangzhou are reported.

Successful dewatering is a key to guarantee pit security in silty sand, therefore the calculation of dewatering surface is rather important.

Based on the engineering practice introduce is made on the construction performance of filling subgrade in silt soil and points for attention.

For improving roadbed filling by adding quicklime to silty sand, the authors obtain some experimental data about improved soil.

With engineering practice,the article analyzes reasons of ground settlement when shield driving is conducted through sandy silt stratum; and it also sums up the secured measures.

An introduction is given to the comprehensive construction technology for the tunnel with sandy silt and complicated surrounding environment, including waterproof technology, settlement prevention, and old tree protection.

Based on a large amount of field and laboratory tests the standard and methods for the liquefaction evaluation of sandy silt in the old course of Suzhou River are presented.