悬挂式防渗墙控制管涌发展的模型试验研究

利用室内砂槽试验,对有无悬挂式防渗墙以及不同土层结构的3种堤基管涌破坏过程进行了模拟,研究了悬挂式防渗墙控制管涌发展的机理以及悬挂式防渗墙对管涌发展过程的影响。试验结果表明,在双层和三层堤基中设置悬挂式防渗墙,可以改变砂砾层内部渗透压力的分布和管涌破坏发展的路径,提高管涌破坏的水力梯度,降低管涌破坏的流量、出砂量和破坏范围。但是,含悬挂式防渗墙的双层堤基和三层堤基的管涌破坏形式不同,双层堤基中,防渗墙上游侧的管涌破坏在砂砾层内部发展,而在三层堤基中防渗墙上游侧的管涌破坏在砂层顶面发展。

Experimental researches on piping development control by means of suspended cut-off wall in double and three layer embankment

According to the standard of academic burnout and the definition of class period, the author made a survey of recessive dropout among 2000 subjective from sophomores in a university, as well as the investigation of the AQ. The results show that the specific performance and reasons of College Students' learning burnout were found out, which provided scientific basis for making relevant interventions and policy.