考虑板土相互作用的排水板通水特性试验研究  

Experimental study on discharge capacity of prefabricated vertical drain considering interaction of PVD and soil

作　　者：朱群峰[1,2] 高长胜 占鑫杰[1,2] 张凌 杨守华[1,2] 明经平 

机构地区：[1]南京水利科学研究院,江苏南京210024 [2]水文水资源与水利工程国家重点试验室,江苏南京210029

出　　处：《岩土工程学报》2017年第12期2158-2164,共7页Chinese Journal of Geotechnical Engineering

基　　金：水利部公益性行业科研专项经费资助项目(201401006);南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金重点项目(Y316004;Y317007);软弱土与环境土工教育部重点实验开放基金(2017P02)

摘　　要：为研究排水板在实际工况下的通水特性,研制排水板纵向通水量测试新仪器,采用室内真空预压模型试验、堆载预压模型试验和直接充灌淤泥等方法来制作板土单元体(试样),并开展板土单元体(试样)通水能力测试。试验结果表明:无论是直接充灌淤泥法、堆载预压法还是真空预压法,高性能排水板通水量均大于现行规程试验结果,而普通排水板通水量均小于现行规程试验结果,现行规程方法高估了真空预压后普通排水板的通水能力。对比结果表明:高性能排水板在堆载预压后通水能力与真空预压后通水能力接近,而普通排水板在堆载预压后通水能力明显高于真空预压后通水能力。因此,对于变形大且固结时间长的新近吹填淤泥地基加固工程应优先选用高性能排水板。In order to study the practical discharge capacity of prefabricated vertical drain （PVD）, a new apparatus is developed. The laboratory vacuum preloading model tests, surcharge preloading model tests and direct filling tests are used to produce the PVD-soil element samples, and the discharge capacity measurements of PVD-soil element samples are conducted. The test results show that regardless of using the direct filling tests, laboratory vacuum preloading tests and surcharge preloading tests, the discharge capacity of high-performance PVD is higher than that measured by the current specification, and that of the traditional PVD is lower than the value measured by the current specification. The results by the current specification overestimate the discharge capacity of the traditional PVD under vacuum preloading. The comparative test results reveal that the discharge capacity of the high-performance PVD under surcharge preloading is close to that under vacuum preloading, and the discharge capacity of the traditional PVD under surcharge preloading is higher than that under vacuum preloading. Therefore, for the newly dredged soft soil reinforcement project, when the settlement of soil is large and the consolidation period is long, the high-performance PVD should be preferred.

关 键 词：高性能排水板 普通排水板 通水量测试新仪器 板土单元体 模型试验 

分 类 号：TU411[建筑科学—岩土工程]