悬挂式防渗墙对不同细料含量堤基管涌的影响

发布时间：2018-06-23 22:01

本文选题：悬挂式防渗墙 + 管涌　；参考：《人民黄河》2017年01期

【摘要】：在有悬挂式防渗墙的情况下,细颗粒含量不同的堤基,管涌的发展情况和破坏形式不同。利用室内砂槽试验,通过改变堤基的细颗粒含量,对含有悬挂式防渗墙的双层堤基管涌破坏过程进行了模拟,研究了防渗墙对细颗粒含量不同的3种堤基管涌破坏形式和发展机理的影响。试验结果表明:细颗粒含量为26%时,临界水力梯度较大,但是发生管涌后,流量和涌砂量较大,管涌发展速度较快,且管涌通道主要发生于砂砾石层顶面,破坏程度逐渐提高,容易产生较大的渗透变形,造成堤基上部黏土层的坍塌,对工程的危害较大;细颗粒含量小于23%时,管涌发展逐渐从砂砾石层顶面转为砂砾层内部,管涌时细颗粒在土体孔隙中流动,对土骨架的影响较小,管涌发展速度较慢,对堤基的危害程度较低。
[Abstract]:In the case of suspended impervious wall, the development and failure form of pipe surge are different for embankment with different fine particle content. By changing the content of fine particles in embankment foundation, the failure process of double-layer embankment foundation with suspended cutoff wall was simulated by using indoor sand tank test. The influence of impervious wall on the failure modes and development mechanism of three kinds of embankment pipeline with different fine particle content was studied. The test results show that the critical hydraulic gradient is larger when the fine particle content is 26, but after the pipe surge, the flow rate and sand surge amount are larger, the piping development speed is faster, and the piping passage mainly occurs on the top of the sand and gravel layer, and the damage degree increases gradually. It is easy to produce large seepage deformation, which results in the collapse of the upper clay layer of the embankment foundation, which is harmful to the project. When the content of fine particles is less than 233.When the content of fine particles is less than 23, the piping development gradually changes from the top surface of the gravel layer to the inside of the sand gravel layer. The flow of fine particles in the soil pore during piping has little influence on the soil skeleton, and the speed of piping development is relatively slow, and the harm to the embankment foundation is low.
【作者单位】：河海大学岩土工程研究所;安徽省交通规划设计研究总院股份有限公司;
【基金】：国家“973”计划项目(2012CB417005) 江苏省普通高校研究生科研创新计划项目(CXZZ13_0243)
【分类号】：TV223.4

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