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本文以成都市为例,基于土壤腐蚀性指标(电阻率、p H值、含水量、含盐量和Cl-含量)的调查,采用评分法对土壤腐蚀性进行分析和评价。结果表明:成都市土壤采样点的电阻率、p H值、含水量、含盐量、Cl-含量分别介于52~270Ω·m、4.50~7.73、9.70%~22.49%、0.05%~0.61%、0.0036%~0.0089%之间。根据单因素方差分析,各指标在城市不同方位和不同圈层无显著性差异;此外,成都市土壤采样点腐蚀性评分为9.5,属于中等腐蚀水平;其腐蚀性评分在不同圈层上无显著性差异,但是在方位上,具有显著性差异,尤其是在成都西面,土壤腐蚀性相对更高。综上所述,在成都市公用埋地管道建设和运行过程中,需从质量控制、防腐技术、防腐检验与检测等方面做好相应的防腐措施。
Taking Chengdu as an example, based on the investigation of soil corrosivity index (resistivity, p H value, water content, salt content and Cl- content), the paper analyzed and evaluated the soil corrosivity by using the scoring method. The results showed that the resistivity, p H value, water content, salt content and Cl- content of soil samples in Chengdu ranged from 52 to 270 Ω · m, from 4.50 to 7.73, from 9.70% to 22.49%, from 0.05% to 0.61% , Between 0.0036% and 0.0089%. According to the one-way analysis of variance, there was no significant difference among different directions and different circles in urban areas. In addition, the soil sampling point corrosion rating of Chengdu was 9.5, belonging to the medium level of corrosion; the corrosion score of Chengdu had no significant difference in different layers However, there are significant differences in orientation, especially in the west of Chengdu where the soil is relatively more corrosive. To sum up, in the process of construction and operation of public buried pipelines in Chengdu, appropriate anti-corrosion measures should be taken in aspects of quality control, anti-corrosion technology, anti-corrosion inspection and testing.