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通过对钱塘江河口堤坝白蚁危害的普查和研究,发现土埝中含有盐份的堤坝不受白蚁入侵。基于此,取用大坝防渗黏土,在土料中加入食盐后进行物理力学指标和白蚁穿越能力的试验,结果表明:当土样含盐量在2%以下,物理力学指标变化很小;当土样含盐量达到0.6%,能有效阻止白蚁的穿越。在此基础上,结合堤坝的结构类型和白蚁在坝体内的筑巢特征,确定了预防白蚁入侵堤坝的盐土铺垫位置、含盐量及实施工艺。该项技术在多条有严重白蚁危害的堤坝中进行应用,防治效果显著,为堤坝白蚁的治理提供了新的思路和方法。
Through the census and research on the termite damage of the Qiantang River estuary dyke, it is found that the dykes containing salt in the soil are not affected by termites. Based on this, taking the test results of dam impervious clay, adding salt to the soil after physical and mechanical tests and crossing ability of termites, the results show that physical and mechanical indexes change little when soil salt content is under 2% When soil salt content reached 0.6%, can effectively prevent the passage of termites. On this basis, combining with the structure type of dykes and the nesting characteristics of termites in the dams, the location of salt-soil bedding, the salt content and the implementation process of the termite intrusion prevention dams were determined. The technique is applied in a number of dams with severe termite damage and has significant prevention and control effects. This provides a new way of thinking for the treatment of termite dams.