考虑水平（切向）位移影响的垫层孔隙内土工膜顶胀

The common cushion layer used in the geomembrane face rockfill dam is made of granular materials such as gravel and non-fine concrete where bulge deformation or failure of geomembrane is very likely to occur in its surface holes. The curve intersection method based on the thin film theory is the common method used to analyze the bulge deformation of the geomembrane in the surface holes of cushion layer. However, it is inaccurate due to the neglection of horizontal (tangential) displacement of the geomembrane. Based on the FEM theory, a new method is proposed, which takes the horizontal (tangential) displacement of geomembrane into consideration, and is validated by the bulge tests on the geomembrane in a circular hole. The deformations and strains of the geomembrane in different shapes of holes are analyzed by this method, and different strain distributions and failure modes are obtained. The curve intersection method is also used to compare with the new method under the same condition. It is indicated that there is less difference in the deformation and average strain of the geomembrane when the water pressure is low. However, when the water pressure is relatively high, the influences of horizontal (tangential) displacement of the geomembrane on its strain should not be neglected.     

利用双排列CP电阻率测试技术进行垂直铺塑施工质量检测研究

垂直铺塑是水利、建设和环境工程等领域常用的防渗处理手段。在铺塑过程中,由不同原因造成的防渗膜布设深度不够、搭接不好以及划破等质量问题会大大降低防渗膜的防渗效能。对于这种被垂直铺设在地层中二维纤薄体分布形态的探测,是一种非常必要但又急待解决的隐蔽工程施工质量的检测难题。根据垂直布设的防渗膜对人为在地层中建立的静电场的改变,设计了双排列CP电测装置对此进行了三维电阻率探测。理论分析和野外试验表明:在实测电剖面图上低阻异常区和防渗膜的分布区域存在对应关系,异常区的尺度可以反映实际防渗膜布设的尺度;膜间搭接不好形成的裂缝显示高阻异常特征。此外还讨论了对防渗膜分布形态的反映精度及不同排列设置参数对测试结果的影响。研究表明,采用特殊设置的三维电阻率探测技术可以实现对防渗膜在地下垂直分布形态的有效探测。     

Role of overconsolidation on sand–geomembrane interface response and material damage evolution

The behavior of high-density polyethylene (HDPE) reinforcement elements is critical to the overall performance of many geotechnical structures including landfills, retaining walls, embankments, and shallow foundations. The reinforcement elements, which may consist of manufactured sheets or strips, must be properly installed in order to transfer stresses from areas of concentrated loading to reinforcing zones. While attention is given during construction to avoid contact damage of reinforcement elements, the construction process exerts stresses on the reinforcement element that may substantially exceed the stresses acting throughout the structure's service life. This paper examines the influence of overconsolidation of HDPE reinforcement elements on interface performance through examination of its effect on sand–smooth geomembrane interfaces. A range of overconsolidation and operational normal stress values are selected based on conditions typically present in practice. Results show the peak friction coefficient to increase substantially with overconsolidation magnitude while the effect on the residual friction coefficient is minimal. The magnitude of the increase in peak friction coefficient is shown to be dependent on both the damage induced by the smooth geomembrane and the degree to which sand particles adjacent to the interface undergo damage in the form of breakage during shear. The damage induced by the smooth geomembrane and the sand particles are presented in terms of the level of overconsonsolidation, confinement stress during shear, and particle characteristics such as angularity and hardness.     

二布一膜改良路基试验研究

利用二布一膜的隔水防渗特性,铺设在路基基床表层,改良路基填料。通过室内试验、现场动、静载试验和防渗测试证明,改良措施是可靠的,能够有效地保持路基的强度和稳定性,降低工程造价。同时还提出一种二布一膜原位受力和变形有效监测方法。     

深圳天麓三区莱茵堡种植屋面施工技术

某小区地下室种植顶板防水,采用HDPE土工膜作为耐根穿刺防水层,DAL自粘防水卷材作为普通防水层。本文简介了这类材料的性能特点及其施工工艺流程,包括基层清理、节点部位涂刷附加层、定位弹线、铺贴卷材、粘合、搭接、收头固定和密封等步骤。     

HDPE自粘胶膜防水卷材在北京地铁6号线某区间隧道中的应用

介绍了HDPE自粘胶膜防水卷材在北京地铁6号线某区间隧道中的施工与应用技术,重点介绍了高分子自粘胶膜防水卷材的构造、性能、防水机理,以及防水工程的施工工艺、质量及验收要点。     

谈引黄北干耿庄水库复合土工膜施工技术

针对引黄入晋工程中耿庄水库复合土工膜施工技术进行了介绍,分别阐述了基层检查、膜裁剪、铺设、焊接、锚固、检测验收等主要工序,并给出了复合土工膜施工的技术措施,为今后同类复合土工膜铺设施工提供了一定指导。     

兰州某垃圾填埋场场地岩土工程条件评价及防渗处理方案建议

通过对垃圾填埋场场地岩土工程条件的分析,对垃圾填埋场拟采用的防渗方案进行了比选,提出了粘土铺盖加HDPE（高密度聚乙稀）防渗膜的综合防渗方案,对同类工程防渗设计具有参考意义。     

防渗技术在石油化工项目中的应用

石化领域的环境保护越来越受到人们的重视,防渗处理成为石油化工项目设计过程中的新课题。以防渗技术在某石化装置中的应用为例,综合比对两种方案,确定采用HDPE土工膜防渗结构层作为实施方案,并且结合装置实际情况,对实施方案进行优化。其中,详细介绍了土工膜材质的选择和设计及施工要点。