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原位测试技术分析软土的应力历史可以避免取样及室内土工试验对土样的扰动,其结果能真实地反映现场土体的工程特性。以往基于孔压静力触探(CPTU)测试技术的超固结比(OCR)计算方法主要是针对超固结土取得的,缺乏对现场处于欠固结状态土体的考虑,具有一定的局限性。在已有研究成果的基础上,提出采用不完全孔压消散曲线的末段及时间平方根倒数外推法计算原位初始孔压,如果初始孔压大于静水压力,表明原位土层中存在固有孔压,为欠固结土。在此基础上,通过计算固结状态参数,可进一步对软土层的欠固结程度进行定量评价。工程应用表明,该方法不受软土性质和地域限制,具有普遍适用性,是合理可行的。在缺乏室内固结试验成果的情况下,可高效快捷地判别软土层的固结状态。研究成果对合理评价欠固结软土的工程特性具有一定的指导意义。
In situ testing of soft soil stress history analysis can avoid sampling and indoor soil test on soil samples, the results can truly reflect the engineering characteristics of the soil. In the past, the calculation method of overconsolidation ratio (OCR) based on the CPTU test technique was mainly for the acquisition of overconsolidated soil, which lacks the consideration of the soil underconsolidated state in the field and has some limitations Sex. Based on the existing research results, it is proposed to calculate the initial pore pressure using the last paragraph of the dissipation curve of incomplete pore pressure and the inverse time-squared root inverse. If the initial pore pressure is greater than the hydrostatic pressure, Hole pressure, under consolidated soil. On this basis, by calculating the consolidation state parameters, the degree of under-consolidation of soft soil layer can be further quantitatively evaluated. Engineering application shows that this method is not affected by the nature of soft soil and geographical restrictions, is generally applicable, is reasonable and feasible. In the absence of the results of indoor consolidation test cases, can be quickly and efficiently determine the consolidation status of soft soil layer. The research results have certain guiding significance for the reasonable evaluation of engineering properties of underconsolidated soft soil.