南海珠江口盆地贝壳砂土力学性质初步研究

A PRELIMINARY STUDY ON MECHANICAL PROPERTIES OF SHELL SAND FROM ZHUJIANG RIVER MOUTH BASIN,SOUTH CHINA SEA

通过对珠江口盆地广布的贝壳砂的化学组分、粒度组成、形成时代的研究以及对砂土进行直剪试验、高压固结试验、常规三轴剪切试验和动三轴试验，对贝壳砂的土力学性质及动载荷作用下的稳定性作了初步分析，获取了贝壳砂的基本物理力学参数并评价了地震作用下砂土液化的可能性，为海洋工程的设计和施工提供了基本的物理力学参数。

For the special properties of ndnera composition, physical property andsoil structure of shell sand, its mechanical propenies are different from those describedby the classical mechanical theory. Based on the analyhc results of chemicalcomponent, grain size distribuhon, formahon age, and direct shear test .high pressureconsolidation test, triaxial shear test and dynamic tria-xial shear test of shell sand fromthe Zhujiang fover mouth basin in the northern of the South China Sea a preliminarydiscussion on the mechanical propenies of shell sand and the engineering stabilityunder the condition of cyclic loading is provided. The basic mechanical parameters ofshell sand are obtaned and the influence of liquefachon caused by earthquake is alsodiscussed, which provide basic mechanical pararneters for the designing and buildingof marine engineering.