关键词: 水泥土, 矿物成分, 有机质含量, 无侧限抗压强度

Abstract: Aiming at the soft foundation treatment project of bridge tunnel section on the west artificial island, Hong Kong-Zhuhai-Macau Bridge, we carried out physical property tests to study the mechanics characteristics of different cement soils (sludge, sludge clay and silty clay) under the constant cement content at 18%, different curing periods and different curing environments. Based on the test results, we discuss the influence of mineral composition, organic matter content in soil and different curing conditions on the unconfined compressive strength and cement reinforcement mechanism. The results showed that under the seawater environment, the effect of cement reinforcement follows a descend order of silty clay, sludge clay, sludge. The initial-gain effect of sea water environment follows a descend order of sludge clay, sludge, silty clay; and the later-gain effect of sea water environment follows a descend order of silty clay, sludge, sludge clay.

Key words: cement soil, mineral composition, organic matter content, unconfined compressive strength