基于全流触探贯入仪的软土强度特性评价方法

发布时间：2018-02-24 00:39

本文关键词： 全流触探贯入仪软土不排水抗剪强度灵敏度　出处：《地下空间与工程学报》2016年S2期 　论文类型：期刊论文

【摘要】：随着海上大型项目的不断发展,传统水下静力触探技术难以满足工程需要,全流触探技术相较传统静力触探具有获取参数更加准确、不用修正上覆土压力和节省时间的优点。采用自主研发的全流触探贯入仪,针对福州海相软土的强度特性进行了贯入试验和循环贯入试验,得到了原状土的贯入阻力和重塑土的贯入阻力。通过贯入阻力评价了原状土的不排水抗剪强度和重塑土的不排水强度,最后根据这两项指标计算出该区域软土的灵敏度,与原位十字板剪切试验得到的灵敏度非常吻合。研究发现:在计算不排水抗剪强度时,修正系数N不仅需要考虑土类,还应考虑土层厚度的影响。
[Abstract]:With the continuous development of large-scale offshore projects, the traditional underwater static penetration detection technology is difficult to meet the engineering needs, and the full flow penetration detection technology has more accurate parameters than the traditional static penetration detection technology. Without modifying the overburden pressure and saving time, the penetration test and cyclic penetration test were carried out according to the strength characteristics of Fuzhou marine soft soil by using the self-developed full-flow penetration instrument. The penetration resistance of the undisturbed soil and the penetration resistance of the remolded soil are obtained. The undrained shear strength of the undrained soil and the undrained strength of the remolded soil are evaluated by the penetration resistance, and the sensitivity of the soft soil in the region is calculated according to these two indexes. The results agree well with the sensitivity obtained by in-situ cross plate shear test. It is found that the correction factor N should consider not only the soil type but also the influence of soil thickness in the calculation of undrained shear strength.
【作者单位】：东南大学岩土工程研究所;江苏省城市地下工程与环境安全重点实验室;
【基金】：全国优秀博士学位论文作者专项资金(201353) 江苏省杰出青年基金(BK20140027) 中央高校基本科研业务费专项资金资助江苏省普通高校研究生科研创新计划资助项目(SJLX15_0058)
【分类号】：TU447

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