【作者】 黄英豪； 朱伟； 董婵； 周宣兆；

【Author】 HUANG Ying-hao;ZHU Wei;DONG Chan;ZHOU Xuan-zhao;Geotechnical Research Institute,Nanjing Hydraulic Reasearch Institure;National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,Hohai University;College of Water Conservancy and Hydropower Engineering,Hohai University;Three Gorges Geotechnical Consultants Corporation Limited;

【机构】 南京水利科学研究院岩土所； 河海大学水资源高效利用与工程安全国家工程研究中心； 河海大学水利水电学院； 长江三峡勘测研究院有限公司；

【摘要】 以完全扰动重塑的泥浆作为评价基准,从土结构性的角度考察了水泥固化淤泥的力学特性,发现固化淤泥是一种典型的结构性土,存在明显的固结屈服应力,屈服前后固化淤泥的力学性质显著不同。固化淤泥的压缩曲线位于淤泥的固有压缩曲线的上方,屈服之前固化淤泥的压缩性很小,屈服后压缩性迅速增大。水泥添加量越高,固化淤泥的固结屈服应力越大。固结不排水剪切试验中,若固化淤泥未在固结围压下屈服,剪切时表现出超固结土的性质,若在围压下屈服,固化淤泥则表现出正常固结土的性质。屈服之前,固化淤泥的不排水强度基本不随围压改变,屈服后的强度随围压线性增大。水泥的加入会使粘聚力和内摩擦角都增大,屈服前阶段固化淤泥的强度由胶结作用所控制,屈服后阶段由组构作用所控制。在固化淤泥的实际工程应用中,应考虑到它所特有的结构性力学特性。更多还原

【Abstract】 Assessment based on the remoulded and reconstituted dredged material(DM),mechanical behaviors of cement solidified dredged material(SDM) were studied.It was found that the SDM is a typical structure soil,there is a consolidation yield stress for SDM,the mechanical behaviors are significantly different between pre-yield and post-yield.The compression line of the SDM is above the intrinsic compression line(ICL) of the remoulded and reconstituted DM,the void ratio changes little before yielding,and the compressibility changes dramatically after yielding.The yield stress increase with cement content increase.In the tri-axial consolidation undrained shear tests,the SDM behave like overconsolidation soil if it not yielding by the consolidation pressure,and it behave as normal consolidation soil after yielding.The strength behavior shows that the strength of the SDM change little in pre-yield state,but the strength in post-yield state linearly increase with consolidation pressure.Both of the cohesion and internal friction angles of SDM are larger than that of untreated DM.Strength of SDM is governed by bonding effect and fabric effect in pre-yield state and post-yield state,respectively.The structural behavior of SDM should be considered in the field engineering application.更多还原