为解决隧道防排水中的土工布结晶堵塞问题，基于表面改性技术开展土工布亲水性表面改性试验，探索亲水性表面改性土工布减缓碳酸钙结晶淤堵形成的可行性。1）通过表面改性法，制备PEG改性土工布和硅溶胶改性土工布，2种亲水物质均能够较好地附着在土工布纤维表面，土工布的亲水性和透水性得到提高； 2）2种改性土工布表面附着非离子型粒子且排水能力得到提升后，都有不同程度减缓结晶淤堵的能力； 3）2种改性剂在3种材质土工布上的阻垢率大小均表现为复合土工布>长丝土工布>短纤土工布，PEG改性土工布的阻垢率要高出20%~30%，能够更好地起到缓解结晶淤堵的作用。
To prevent the geotextiles in tunnel waterproofing and
drainage from crystal blockage, a hydrophilic surfacemodification
test of geotextiles is conducted based on the surfacemodification
technology. In addition, the feasibility of these modified geotextiles to slow
down the formation of calcium carbonate crystal blockages is explored. The
results reveal that: (1) 〖JP2〗By
using the surfacemodification method, the geotextiles
modified by polyethylene glycol(PEG) and silica sol are prepared, and the two hydrophilic
substances can be better attached to the fiber surface, thus improving the
hydrophilicity and permeability of the geotextile. (2) After nonionic particles
are attached on the surface of the two modified geotextiles, the drainage
capacity of the geotextiles is improved, thus relieving the crystallization
blockage phenomenon. (3) The scaleresistance rate of
the two modifiers on the three geotextile materials is manifested in the
following order: composite geotextile > filament geotextile > staple
fiber geotextile. In addition, the scaleresistance
rate of the geotextile modified using PEG is 20%~30% higher, thus showing a better relief effect of the
crystallization blockage.
