一、问题的提出土工合成材料与传统的过滤材料相比具有许多优越性。目前在工程中土工织物正在代替透水的砂石滤料,在欧美国家中采用土工织物为反滤材料日趋广泛,并相继建立了反滤准则。应用土工织物正处在发展阶段,对于有效孔径O_e等参数的取值尚未统一,再则各个国家与地区的土质差异又很大,因此到目前为止国际上也尚未制定统一标准。我国土工织物的研究、开发与应用均较国外为晚,至今尚未制定统一的反滤设计准则。近年来,由于土工织物的应用已从起步阶 First, the issue put forward Geosynthetics compared with the traditional filter material has many advantages. At present, geotextiles in the project are replacing pervious sandstone filters. Geotextiles are increasingly used as filter media in Europe and the United States, and filter guidelines have been established one after another. The application of geotextile is in the development stage, the effective aperture O_e and other parameters have not yet been unified, and then the various countries and regions have very different soil quality, so far the world has not yet developed a uniform standard. The research, development and application of geotextile in our country are both later than foreign countries. So far, no uniform standard of filter design has been formulated. In recent years, due to the application of geotextiles has been from the start