EXPERIMENTAL RESEARCH ON WIND RESISTANCE OF SILTY SOIL CEMENTED BY SOYBEAN UREASE INDUCED CALCIUM CARBONATE PRECIPITATION
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摘要: 针对日益严重的粉尘污染问题,探讨利用大豆脲酶诱导碳酸钙沉积(EICP)技术治理黄泛区裸露粉土扬尘。通过离心提取的大豆脲酶与尿素-氯化钙混合配置的反应液对黄泛区粉土进行固化,开展了室内抗风试验、碳酸钙生成量检测和表面强度试验。试验表明:EICP技术能使土体表面生成一层硬壳层,将表面的土颗粒相互胶结在一起,具有抗风侵蚀特性。为进一步揭示EICP在处理扬尘方面的成效,对不同浓度反应液、豆粉质量浓度及喷洒量对粉土固化效果的影响进行了研究,结果表明:土样损失量随着反应液浓度、豆粉质量浓度及喷洒量的增加而降低,当反应液浓度为0.08 mol/L时,豆粉质量浓度为40 g/L,处理液体积为4 L/m2时,EICP加固的试样质量损失量为零,试样具备良好的抗风侵蚀特性。Abstract: In the light of the increasingly serious dust pollution, the technique of soybean urease induced calcium carbonate deposition (EICP) was used to control the dust of exposed silt in the flood area of the Yellow River. The reaction solution of soybean urease extracted by centrifugation and urea-calcium chloride was used to cement the silt in the flood area of the Yellow River,and the indoor wind resistance test, calcium carbonate production test and surface strength test were conducted. The results showed that the technique of soybean urease induced carbonate precipitation could form a crust in the surface of silty soil, which made the surface soil particles cement together and have the characteristics of wind erosion resistance. In order to further reveal the effectiveness of EICP in the treatment of dust, the effects of different concentrations of reaction solution, mass concentrations of soybean powder and sprayed amounts on cementing effect of silt were studied. The results showed that the mass loss of soil specimens decreased with the increase of the concentration of reaction solution, the mass concentration of the soybean powder and the amounts of being sprayed, when the reaction solution concentration was 0.08 mol/L, the mass concentration of soybean powder was 40 g/L and the volume of treatment solution was 4 L/m2, the mass loss of EICP cemented specimens was zero, the specimens were of good wind erosion resistance characteristics.
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