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摘要: 选取2种干密度与3种含盐量配比的土样, 分别进行了素土对纯水和盐渍土对氯化钡溶液的吸渗试验, 测试了反应后剩余硫酸钠含量, 得到了采用吸渗灌浆方法处理硫酸盐渍土的完全处理长度。分析了完全处理长度的影响因素, 计算了完全处理长度的修正系数。试验结果表明: 吸渗化学灌浆能够显著降低土样中硫酸钠含量, 当土样干密度为1.4g·cm-3, 含盐量分别为1%、2%、3%时, 吸渗氯化钡溶液约22h后, 土样的完全处理长度分别为22、14、6cm; 当土样干密度为1.6g·cm-3, 含盐量分别为1%、2%、3%时, 吸渗氯化钡溶液约70h后, 土样的完全处理长度分别为10、6、6cm, 故土样的干密度越小, 含盐量越低, 吸渗化学灌浆处理效果越好, 完全处理长度越长。完全处理长度会受到浸湿长度、氯化钡溶液浓度、土样含盐量与含水量增量的影响, 计算得到完全处理长度的修正系数为0.53。Abstract: The soil samples with two kinds of dry densities and three kinds of salinities were selected, the adsorption-seepage experiments of pure soils to water and saline soils to barium chloride solution were carried out, the sodium sulfate contents were measured after reaction, and the complete processing lengths of sulphate saline soils were gotten by permeating-chemical grouting treatment method.The influencing factors of complete processing length were analyzed, and the correction factor of complete processing length was computed.Test result shows that the sodium sulfate content of soil sample significantly reduces because of the intelligent use of permeatingchemical grouting treatment method.Under the condition that the dry density is 1.4g·cm-3 and the permeating-chemical grouting treatment time based on barium chloride solution is about 22 h, when the mass concentrations of sodium sulfate in soil samples are 1%, 2% and 3% respectively, the complete processing lengths of soil samples are 22, 14 and 6cm respectively.Under the condition that the dry density is 1.6g·cm-3 and the permeating-chemical grouting treatment time based on barium chloride solution is about 70 h, when the mass concentrations of sodiumsulfate in soil samples are 1%, 2% and 3% respectively, the complete processing lengths of soil samples are 10, 6 and 6cm respectively.Therefore, the lower the dry density and saltness of soil sample are, the better the permeating-chemical grouting treatment effect is, and the larger the complete processing length is.The complete processing length is affected by the wetting length, the concentration of barium chloride solution, soil saltness and the increment of water content in soaking section, and the computational correction factor of complete processing length is 0.53.
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图 7 干密度为1.4g·cm-3的盐渍土含水量分布
Figure 7. Water content distributions of saline soils with dry density of 1.4g·cm-3
图 8 干密度为1.6g·cm-3的盐渍土含水量分布
Figure 8. Water content distributions of saline soils with dry density of 1.6g·cm-3
图 9 干密度为1.4g·cm-3的盐渍土硫酸钠含量分布
Figure 9. Sodium sulfate content distributions of saline soils with dry density of 1.4g·cm-3
图 10 干密度为1.6g·cm-3的盐渍土硫酸钠含量分布
Figure 10. Sodium sulfate content distributions of saline soils with dry density of 1.6g·cm-3
图 12 干密度为1.4g·cm-3的盐渍土的含水量与扩散参数的关系
Figure 12. Relationships between water contents and diffusion coefficients of saline soils with dry density of 1.4g·cm-3
图 13 干密度为1.6g·cm-3的盐渍土的含水量与扩散参数的关系
Figure 13. Relationships between water contents and diffusion coefficients of saline soils with dry density of 1.6g·cm-3
表 1 修正系数
Table 1. Correction coefficients
表 2 H的计算值和实测值
Table 2. Computed and measured values of H
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