为解决隧道土工布结晶淤堵的问题，本文进行了室内模型试验，将现场土工布样品和试验样品进行SEM扫描电镜分析，对结晶体微观形态与土工布间的粘结方式进行研究，得到土工布材质、土工布单位面积质量以及土工布放置坡度对结晶淤堵的影响规律： 1）在9种工况下，试验前7 d的结晶速率比余下周期快2.4倍，随后不同程度的减小；在相同的土工布材质条件下，单位面积质量为500 g/m2的土工布结晶速率较300 g/m2和400 g/m2的土工布分别快99%和37%。2）土工布单位面积质量相等时，复合土工布表面结晶量少于长丝土工布和短纤土工布，但当单位面积质量增大到500 g/m2后，长丝土工布表面结晶量反而超过另外2种土工布。3）在单位面积质量和材质都相同的条件下，当以坡度为0°放置时（拱顶位置），长丝、短纤和复合土工布的结晶量最大，分别为153.09、203.97、63.67 g，当以坡度为90°放置时（拱脚位置），长丝、短纤和复合土工布的结晶量分别为59.44、71.43、25.35 g，说明试验坡度将影响土工布结晶淤堵速率，放置坡度越平缓，结晶速率越快。
To solve the
problem of crystalline blockage of tunnel geotextiles, an indoor model test is
conducted, and the onsite geotextile samples and test
samples are analyzed using SEM scanning electron microscope. Furthermore, the
bonding method between the crystal microscopic morphology and the geotextile is
investigated. The influence of geotextile material, geotextile mass per unit
area, and geotextile placement slope on crystallization blockage is as follows:
(1) Under 9 working conditions, the crystallization rate in the first 7 days of
the test is 2.4 times faster than the rest of the cycle, and then decreases in
different degrees; under the same geotextile material conditions, the
crystallization rate of the 500 g/m2 geotextile is 99%
and 37% faster than that of the 300 g/m2 and 400 g/m2 geotextiles. (2) When the unit area mass of the geotextile is
equal, the surface crystallinity of the composite geotextile is less than that
of the filament geotextile and the staple fiber geotextile; when the mass per
unit area increases to 500 g/m2, the surface
crystallinity of the filament geotextile exceeds that of the other two
geotextiles. (3) Under the conditions of the same quality and material per unit
area, when placed with a slope of 0° (dome position),
the crystallization amount of filament, staple fiber, and composite geotextile
is the largest, which are 153.09, 203.97, and 63.67 g, respectively; when
placed with a slope of 90° (the arch foot position),
the crystalline amounts of filament, staple fiber and composite geotextile are
59.44, 71.43, and 25.35 g, respectively, indicating that the test slope will
affect the crystallization of the geotextile. The smaller the placed slope, the
faster the crystallization rate.
