澳门海积软土压缩特性和工程地质分层探讨  

Compression characteristics and engineering geological stratification of marine soft soil in Macao

作　　者：荣艳丽 陶旭光 Rong Yanli;Tao Xuguang(CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《工程勘察》2021年第10期35-39,共5页Geotechnical Investigation & Surveying

摘　　要：澳门机场扩建项目勘察深度15m内均为全新世海相沉积流泥、淤泥,在整理室内压缩试验成果过程中,发现随深度增加软土的e-p曲线初始段出现陡降和平缓(压缩模量出现倒大现象)两种变化特征;尤其是出现了无侧限抗压强度与土层深度呈正比但中下部淤泥的压缩模量E_(s0.1-0.2)数值却比表部流泥还小的矛盾现象。如对该区域软土的压缩变形特征认识不足,同场地前期资料一样将它们统一划为Ⅱ_(1)淤泥层,必会造成成陆后沉降变形的估算与实际产生较大偏差。本文根据压缩变形特征将澳门机场扩建项目全新世海积软土划分为Ⅱ0黑灰—灰黄色流泥、Ⅱ_(1-1)灰黄—灰色淤泥、Ⅱ_(1-2)灰色淤泥,确保地质分层的准确性,服务好工程建设。Holocene marine sedimentary flowing mud and mud are distributed within 15m of the exploration depth in Macao airport expansion project,through the laboratory compression test results,it is found that the initial segment of e-p curve of the soft soil has two characteristics of steep drop and gentle drop(the compression modulus is inverted)with the increase of depth.In particular,the unconfined compressive strength is directly proportional to the depth of soil layer,but the compression modulus E_(s0.1-0.2) of the middle and lower mud is smaller than that of the upper flowing mud.If the compression and deformation characteristics of the soft soil in this area are not well understood,they can be uniformly classified asⅡ_(1) mud layer according to the previous site data.It will certainly cause a large deviation between the estimation of subsidence deformation after the land forming and the actual situation.According to the characteristics of the compression deformation,the Holocene marine soft soil in Macao airport expansion project is divided intoⅡ0 black gray-gray yellow flowing mud,Ⅱ_(1-1) gray yellow-gray mud,andⅡ_(1-2) gray mud to ensure the accuracy of the geological stratification,and service for engineering construction better.

关 键 词：澳门 海积软土 压缩特性 工程地质分层 

分 类 号：TU471.8[建筑科学—结构工程]