盐胶结层的特性研究

Research on Characteristics of Salt Cemented Formation

近几年在兰新铁路的第二双线、库格线、哈罗线等新疆多条铁路线路的勘察中,发现在第四系土层中存在一种特殊的胶结类型——盐胶结。通过盐胶结类型的成因、力学特性和机理的分析研究,结果表明盐胶结的成因与盐渍土不同,其强度受含水量的影响较大,由于盐胶结层的存在,导致了岩土施工工程分级由Ⅲ级硬土提高为Ⅳ级软石,施工措施应相应变化。

During the surveys for the Second-Double-Line of Lanzhou-Xinjiang Railway, Gomud-Korla Railway, Hami-Lop Nor Railway and other railways in recent years, a special type of cementation, salt cementation, is found in the quaternary formation. Through the analytical research on its genesis, mechanical characteristics and mechanism, it is demonstrated that the genesis of salt cementation is different from that of saline soil and its strength will be affected by moisture content to a greater extent. Due to the existence of salt cemented formation, excavation classification is increased from Grade III hard-soil to Grade 1V soft-rock and the construction measures are changed accordingly.