水下超软土地基振冲碎石桩试验及参数控制  

Vibro-replacement stone column tests and parameter controls of underwater super soft soil foundation

作　　者：韩冉冉[1] 徐满意[1] 乔小利[1] 王海鹏 郭伟 

机构地区：[1]交通运输部天津水运工程科学研究所,天津300456 [2]大连恒基岩土工程有限公司,辽宁大连116000 [3]上海港湾工程质量检测有限公司,上海201315

出　　处：《岩土工程学报》2013年第S2期612-616,共5页Chinese Journal of Geotechnical Engineering

摘　　要：针对振冲碎石桩在水下超软土地基中的适用性问题,进行了现场试验研究。通过调整振冲碎石桩桩间距、密实电流、留振时间及填料量等4参数,结合重型动力触探和标准贯入原位试验研究了振冲碎石桩处理水下超软土地基的效果,分析了这些参数在振冲碎石桩成桩过程中所起的作用,并在此基础上找到了这些参数的最优组合。试验结果表明:在桩间距一定的情况下,填料量是桩体密实性的最主要控制因素,而留振时间和加密电流则对碎石桩成桩均匀性起关键作用。In order to study the applicability of vibro-replacement stone columns in underwater super soft soils, the field tests are carried out. By adjusting the four-parameters, spacing of vibro-replacement stone column piles, vibro-compaction current, vibration duration and filling quantity, the treatment effect of the vibro-replacement stone columns in under water super soft soils is studied using the heavy dynamic penetration tests and standard penetration tests. The roles of the four parameters are studied in the formation process of piles. On this basis, the best combination of these parameters is found. The test results show that under a certain spacing of vibro-replacement stone columns, the filling quantity is the main control factor for their compactness, and the vibro-compaction current and the vibration duration play a key role in their uniformity.

关 键 词：振冲碎石桩 动力触探试验 标准贯入试验 超软土地基 

分 类 号：TU447[建筑科学—岩土工程] TU473.1[建筑科学—土工工程]