西藏拉洛水利枢纽工程料场分散性土试验研究及思考

Experimental study and thinking on dispersive soil of Laluo Hydro Project in Tibet

为分析分散性土对西藏拉洛水利枢纽工程的影响,在土料场地质勘察中,进行了土的颗粒级配、黏塑性、矿物及化学成分、一般物理力学性质等常规试验,采用了针孔、碎块、双比重计、孔隙水阳离子等4种方法开展分散性试验,结合野外表象调查综合判断料场土具分散性,并进一步分析了分散性土和盐渍土的区别与联系,总结了分散性土勘察试验思路,制定了应分步实施相关分散性土试验的工作流程。提出建立分散性土综合判断原则、分散性等级划分依据等是今后亟待解决的主要问题。

In order to analyze the influence of dispersive soil on Laluo Hydro Project in Tibet, the conventional tests of soil grain composition, viscoplasticity, mineral and chemical composition, and general physical and mechanical properties were carried outin the geological investigation of the soil quarry.The dispersion tests were carried out by using four methods of pinhole, fragment, double hydrometer, and pore water cation to comprehensively judge the dispersibility of the soil in the quarry, and combined with the field surface survey, a comprehensive judgment is proposed that the material field soil has dispersion.The difference and connection between dispersive soil and saline soil are analyzed, the idea of dispersive soil investigation and test is further summarized, and the work flow of dispersive soil test which should be carried out step by step is formulated.The main issues to be solved in the future are proposed, such as the establishment of comprehensive judgment principle for dispersive soil and the classification basis for dispersive grade.