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Structured marine clay is commonly encountered in offshore engineering projects and engineers are concerned about its impact on the engineering properties of marine clay as well as its correlation with index properties. Current research has emphasized the role of soil structure in these aspects of marine clay. In this study, we investigated the influence of depositional environment and oxidation-induced evolution of clay microstructure on the formation of clay structure in structured clay from Zhanjiang area, a coastal city located in South China. The distinct soil structure observed in marine-terrigenous clay deposited under different environments exhibited sensitivity ranging from 1.6 to 8.9 at varying moisture content levels. The wide range of sensitivity observed in structured marine-terrigenous clay was attributed to free iron oxide derived from siderite present in an acidic environment. Compared to other regions, Zhanjiang marine clay demonstrated favorable mechanical properties but poor physical properties due to its unique clay structure characteristics. Based on these findings, we proposed a modified approach for correlating index properties with engineering properties that yielded good predictions. [ABSTRACT FROM AUTHOR]

Archives and oral histories show that the Ming Tombs Reservoir was a showcase project in Communist China directed by and involving the country's top leaders. This was one of the first projects to rely on the mobilization of physical labor rather than specialized machinery, driven by a belief in self-reliance and the use of local resources. It argues that the focus on the "masses," rather than engineers or scientists, challenged established engineering procedures and technical traditions. Historical evidence suggests that adopting a "build while being designed" mindset and mobilizing the "masses," projects could be completed, but often in ways that ultimately proved less than optimal. The case study suggests that innovations fail when local enthusiasm and technical knowledge are not balanced. By focusing on the role of the "masses" in shaping a novel technological landscape, this article highlights "mass engineering" to better understand this model of native innovations and economic autarky. [ABSTRACT FROM AUTHOR]