摘要:
我国现行的液限标准与多数国家的液限标准相比,液限时土的强度偏高,因而需制定新的标准。本文根据对比试验成果,结合我国实际,提出将76g锥（锥角30°）5s时下沉深度17mm含水量定为液限;同时保留76g锥10mm含水量供过渡需要。当采用液塑限联合试验时,对于除低液限土及红粘土等一些特殊土外的细粒土,将76g锥5s时下沉深度2mm含水量定为塑限,可以与搓滚塑限相一致。
Abstract:
The strength of soil at liquid limit according to the current standard of liquid limit in our county is higher than those according to the standard of liquid limit in majority of countries in world, therefore a new standard is required. In this paper, based on the results of the comparative tests, considering the practice in our country, the moisture content, at which a 76 g cone penetrometer （30°apex angle） penetrates into the soil by 17mm, is suggested as the liquid limit. Meanwhile, as an interim measure, the moisture content reading for 10mm penetration of 76g cone is retained. In the combined determination method for liquid and plastic limits, the moisture content, at which a 76 g cone penetrates into the soil by 2mm, is adopted as the plastic limit. This standard is consistent with that obtained by the thread rolling method for most of the finegrain soils except low liquid limit soils and some special soils as laterite.
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