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前言 铁路隧道的混凝土仰拱或者护底,往往由于地下水丰富、水中腐蚀性矿物盐含量高,而遭致化学侵蚀和物理性破坏。从而开始涌水冒泥,继而碎裂坍陷,严重影响隧道结构,破坏线路稳定,危及行车安全,这经常是隧道工程设计人员和养护维修单位所感到棘手的。 长期以来,人们对地下水中所含的矿物盐类,主要是考虑硫酸盐对混凝土的侵蚀,所以采取的措施是使用抗硫酸盐水泥。但是,抗硫酸盐水泥的抗蚀指标仅2500mg/1,因而当地下水中硫酸根离子浓度超过这一指标时,尽管使用抗硫酸盐水泥,隧道混凝土仰拱仍然会遭到腐蚀。
Preface The concrete arch or the protective bottom of railway tunnels are often caused by chemical attack and physical damage due to the abundant groundwater and the high content of corrosive mineral salts in the water. Thus, the gushing and mud-blasting, and then the collapse and collapse, seriously affect the structure of the tunnel, which will damage the stability of the line and jeopardize the traffic safety. This is often a thorny problem for tunnel designers and maintenance and repair organizations. For a long time, the mineral salts contained in groundwater were mainly considered the corrosion of concrete by sulphate, so the measures taken were to use anti-sulfate cement. However, the anti-sulfate cement has a corrosion resistance of only 2500 mg / 1, so when sulfate concentrations in the local sewer exceed this threshold, tunnel abutments are still subject to erosion despite the use of sulfate-resistant cement.