粗颗粒硫酸盐渍土盐胀界限深度的试验探讨
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摘要
为了研究河西粗颗粒盐渍土地基中盐分富集层的赋存形态对地表盐胀量的影响规律,通过现场调研并配合一系列的室内试验,探讨了盐分富集层的含盐量、厚度及埋深等因素诱发地表盐胀的界限值,并探讨了盐分富集层在粗颗粒硫酸盐渍土地基中埋深的敏感区间。研究表明:只有当盐分富集层含盐量大于5.3%,厚度大于38mm时,才可能诱发地表盐胀。且通过现场调研发现,在敦煌等地的盐渍土场地中,盐分富集层的埋深在1.25~2.0m深度范围内时,其对地表盐胀的影响较为显著。
In order to investigate the law of the influence of the occurrence mode of salinity-enriched layer in Hexi coarse-grain saline soil foundation on salt expansion on the earth's surface.The writer will probe into the salt content,thickness,burial depth and other factors of salinity-enriched layer which may induce boundary value of salt expansion on the surface,as well as the sensitive range of the burial depth of salinity-enriched layer in coarse-grain saline soil foundation.It has discovered in the experiment that:only when the salt content is higher than 5.3%in salinity-enriched layer and the thickness larger than 38 mm can it cause the happen of earth surface salt expansion;it has also discovered in field research that in the saline soil area in Dunhuang and other places,the burial depth of salinity-enriched layer varies from 1.25 mto 2.0m,which has outstanding influence on earth-surface salt expansion.
In order to investigate the law of the influence of the occurrence mode of salinity-enriched layer in Hexi coarse-grain saline soil foundation on salt expansion on the earth's surface.The writer will probe into the salt content,thickness,burial depth and other factors of salinity-enriched layer which may induce boundary value of salt expansion on the surface,as well as the sensitive range of the burial depth of salinity-enriched layer in coarse-grain saline soil foundation.It has discovered in the experiment that:only when the salt content is higher than 5.3%in salinity-enriched layer and the thickness larger than 38 mm can it cause the happen of earth surface salt expansion;it has also discovered in field research that in the saline soil area in Dunhuang and other places,the burial depth of salinity-enriched layer varies from 1.25 mto 2.0m,which has outstanding influence on earth-surface salt expansion.
引文
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[6]杨向荣,刘亚峰,杨鹏,等.河西砂类盐渍(硫酸盐)土地基中胶结层形成原因初探[J].工程地质学报,2013,21(4):534-539.
[2]严耿升,张虎元,王志硕,等.风电场盐渍土地基静载试验研究[J].西北水电,2011,30(6):75-80.
[3]张莎莎,杨晓华,戴志仁.天然粗颗粒盐渍土多次冻融循环盐胀试验[J].中国公路学报,2009,22(4):29-32.
[4]新疆公路学会.XJTJ01-2001盐渍土地区公路施工规范[S].北京:人民交通出版社,2002.
[5]吴青柏,孙涛,陶兆祥,等.恒温下含硫酸钠盐粗颗粒土盐胀特征及过程研究[J].冰川冻土,2001,23(3):238-242.
[6]杨向荣,刘亚峰,杨鹏,等.河西砂类盐渍(硫酸盐)土地基中胶结层形成原因初探[J].工程地质学报,2013,21(4):534-539.