土的渗透变形是很多地质灾害及岩土工程事故的主要原因之一,但目前黏土的渗透破坏临界条件研究较少。从微观角度分析了黏土在外界驱动水压作用下的渗透破坏过程,以抗渗强度作为黏土渗透破坏临界条件参数。为获取此参数,设计了模拟外界...土的渗透变形是很多地质灾害及岩土工程事故的主要原因之一,但目前黏土的渗透破坏临界条件研究较少。从微观角度分析了黏土在外界驱动水压作用下的渗透破坏过程,以抗渗强度作为黏土渗透破坏临界条件参数。为获取此参数,设计了模拟外界驱动水压作用下,黏土渗透破坏过程的抗渗强度试验装置及方法。选取广西桂林红黏土层底部原状样,测试了32组不同厚度试样,并得出各试样抗渗强度。依据试验结果,分析了抗渗强度受渗透方式和尺寸效应的影响,并采用Arc Gis软件统计分析试样抗渗强度的差异性。最终选择15组实际渗透厚度2.5 cm试样的试验结果平均值40.8 k Pa,为工程场地黏土抗渗强度值。通过比较抗渗强度值与钻孔实际监测渗透水压,评价工程场地内黏土渗透破坏形成土洞塌陷的可能性。评价结果表明,目前工程场地内黏土渗透驱动水压低于抗渗强度,不具备形成土洞的条件。经实地勘察,评价结果符合现场实际情况。展开更多
We call the modification of clays for retaining the soil stability in geotechnical engineering “passivation”. As the surface of clay minerals interact with passivator during the process of passivation, the surface s...We call the modification of clays for retaining the soil stability in geotechnical engineering “passivation”. As the surface of clay minerals interact with passivator during the process of passivation, the surface structure of clay minerals will be changed and the hydrophobility of clay minerals increased, thus the mechanical strength of clay mineral in the whole will be raised. So, passivator is very useful for geotechnical engineering. We have analyzed external passivator and prepared passivator of clay minerals. The experimental result shows that the properties of soil samples prepared by two passivators are展开更多
文摘土的渗透变形是很多地质灾害及岩土工程事故的主要原因之一,但目前黏土的渗透破坏临界条件研究较少。从微观角度分析了黏土在外界驱动水压作用下的渗透破坏过程,以抗渗强度作为黏土渗透破坏临界条件参数。为获取此参数,设计了模拟外界驱动水压作用下,黏土渗透破坏过程的抗渗强度试验装置及方法。选取广西桂林红黏土层底部原状样,测试了32组不同厚度试样,并得出各试样抗渗强度。依据试验结果,分析了抗渗强度受渗透方式和尺寸效应的影响,并采用Arc Gis软件统计分析试样抗渗强度的差异性。最终选择15组实际渗透厚度2.5 cm试样的试验结果平均值40.8 k Pa,为工程场地黏土抗渗强度值。通过比较抗渗强度值与钻孔实际监测渗透水压,评价工程场地内黏土渗透破坏形成土洞塌陷的可能性。评价结果表明,目前工程场地内黏土渗透驱动水压低于抗渗强度,不具备形成土洞的条件。经实地勘察,评价结果符合现场实际情况。
文摘We call the modification of clays for retaining the soil stability in geotechnical engineering “passivation”. As the surface of clay minerals interact with passivator during the process of passivation, the surface structure of clay minerals will be changed and the hydrophobility of clay minerals increased, thus the mechanical strength of clay mineral in the whole will be raised. So, passivator is very useful for geotechnical engineering. We have analyzed external passivator and prepared passivator of clay minerals. The experimental result shows that the properties of soil samples prepared by two passivators are
