深层水泥搅拌法加固软基模型试验研究  

Model tests on consolidation of soft foundation by deep cement mixing method

作　　者：汪海洋 陈平山[1,2,3] 何丽平 WANG Haiyang;CHEN Pingshan;HE Liping(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;CCCC Key Lab of Environmental Protection&Safety in Foundation Engineering of Transportation,Guangzhou 510230,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China)

机构地区：[1]中交四航工程研究院有限公司,广东广州510230 [2]中交交通基础工程环保与安全重点实验室,广东广州510230 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519000

出　　处：《岩土工程学报》2024年第S01期170-174,共5页Chinese Journal of Geotechnical Engineering

摘　　要：为确定水下深层水泥搅拌各种施工参数,现场试桩需花费较多的时间和成本。依托中交集团DCM(Deep Cement Mixing)法加固软基课题,研发了DCM模型试验装置,开展了DCM加固软基叶片改造、土层识别和成桩强度物理模型试验。结果表明:增加自由叶片后可有效防止水泥搅拌桩在黏土中糊钻问题。不同土层界面处扭矩会发生突变,通过不同深度处扭矩的变化可以感知不同土层。相同水泥掺量前提下不同土样水泥搅拌桩14,28,60,90 d无侧限抗压强度(UCS)规律为淤泥质土<黏土<砂土,在砂土中水泥土强度较大且增长速度较快,砂层中可以适当减少水泥喷浆量。模型试验研究成果,可对深层水泥搅拌桩施工提供参考。In order to determine various construction parameters of underwater deep cement mixing,the field tests needs more time and cost.Based on the(deep cement mixing)DCM method of China Communications Group,the DCM model test devices are developed,and a series of tests are carried out including the blade upgrading,soil layer identification and unconfined compressive strength(UCS)tests.The tests results indicate that adding free blades can effectively prevents blade wrapping issues in clay soils using the DCM method.The torque at the interface of different soil layers changes abruptly,and different soil layers can be identified by the change of torque at different depths.Under the same cement content conditions,the UCS of the cement mixing piles with different soil samples cured 14,28,60 d and 90 d is that silt soil<clay<sandy soil.In sandy soil,the compressive strength of the cement soil is larger and the growth rate is faster than that of clay,and the amount of cement grouting in sand layer can be reduced.The results of model tests may provide reference for deep cement mixing piles.

关 键 词：深层水泥搅拌法 糊钻 软基 模型试验 

分 类 号：TU47[建筑科学—结构工程]