浮泥-流泥路基中防淤堵排水板排水行为

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中文摘要：浮泥-流泥路基真空预压期间塑料排水板易出现严重淤堵,为避免出现该现象,有必要针对浮泥-流泥的物理特性对防淤堵排水板的排水行为进行专项研究.首先基于典型工程的浮泥-流泥试样和典型的防淤堵土工滤膜构成"土-滤膜"过滤排水结构,并综合采用改进的梯度比试验方法、压汞试验方法以及电子显微镜扫描测试方法,分析了分级真空预压下过滤排水结构的过滤排水行为;然后,基于典型的防淤堵土工滤膜和原生料芯板构成典型弯折形态的排水板复合体,采用改进的纵向通水量仪进行了纵向通水能力对比试验,分析了排水板复合体的排水行为,并综合讨论了淤堵评价标准;最后,基于具体工程实例进行了验证.研究结果表明:该类路基分级真空预压设计时,应重点基于等效孔径、渗透系数和孔洞结构特征3项关键技术指标对防淤堵土工滤膜进行选型研究;芯板板槽的压屈强度和排水板复合体的过水断面面积是排水板通水量折减率的关键影响因素,芯板的弯折角和弯折率可作为评价其排水能力的具体控制指标,而排水板的通水量折减率和井阻增幅可作为理论评价指标;该类路基中塑料排水板淤堵评价标准建议定为土工滤膜的梯度比大于4.0,芯板的弯折率大于60％且弯折角小于45°,其理论评价指标可定为弯折状态下排水板的通水量折减率大于90％或井阻增幅大于9.所提出的关于典型弯折形态下排水板复合体室内纵向通水量的试验方法及其数据分析方法,可纳入到《土工合成材料测试规程》(SL-235-2012)以及规范ASTM D6917-16 中.

外文标题：Draining Behaviors of Anti-clogging PVD in Suspended and Fluid-mud Roadbeds

外文摘要：The drainage behaviors of anti-clogging prefabricated vertical drains(PVDs)with respect to the physical properties of suspended and fluid muds must be investigated to effectively avoid the severe clogging of PVDs during the vacuum preloading of suspended-and fluid-mud roadbeds.Hence,using typical suspended-and fluid-mud specimens and several typical anti-clogging geofilter membranes constituting the"soil-filter membrane"of a filtration-drainage structure,the filtration-drainage behaviors of the filtration-drainage structure under graded vacuum preloading was analyzed via a combination of an improved gradient-ratio test method,a pressed-mercury test method,and the scanning test method of an electron microscope.Subsequently,based on several typical anti-clogging geofilter membranes and virgin material core plates constituting a drainage-board composite with several typical bending patterns,a comparative test of the longitudinal hydraulic capacity was performed using an improved longitudinal flux meter to analyze the drainage behaviors of the drainage-board composite,and the clogging evaluation criteria were discussed comprehensively.Finally,validation was performed based on a specific engineering example.The results of the study show that when designing the graded vacuum preloading of this type of roadbed,the anti-clogging geotechnical filter membranes should be selected based on three key technical indexes,i.e.,the equivalent pore diameter,permeability coefficient,and structural characteristics of the pores.The key factors affecting the flux-reduction rate of the drainage board for the compressive flexural strength of the core plate groove,the cross-sectional area of the drainage-board composite,and the bending angle and bending rate of the core plate can be used as control indexes for evaluating its drainage capacity.The flux-reduction rate of the drainage board and the increase in well resistance can be used as theoretical evaluation indexes.The proposed clogging evaluation criteria for PVDs are as follows:a filter-membrane gradient ratio＞4.0,core board bending rate＞60％,core board bending angle＜45°,reduction rate of flow capacity of bending drainage board＞90％,or well-resistance increment＞9.The test method for the indoor longitudinal water flux of drainage-board composites under typical bending patterns and the analysis method can be incorporated into the Specification for Test and Measurement of Geosynthetics(SL 235-2012)and ASTM D6917-16.

外文关键词：

subgrade engineeringsuspended and fluid mudmacro and micro testsprefabricated vertical draindrainage behaviorclogging evaluation criteria

作者：

鲍树峰、董志良、莫海鸿、张劲文、江学良、刘攀、罗晓晓

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作者单位：

广州交通大学(筹)土木与工程管理学院,广东广州 510725

广东省近海基础设施绿色建造与智能运维重点实验室,广东广州 510725

中交四航工程研究院有限公司,广东广州 510230

中交集团交通基础工程环保与安全重点实验室,广东广州 510230

华南理工大学土木与交通学院,广东广州 510641

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关键词：

路基工程浮泥-流泥宏微观试验塑料排水板排水行为淤堵评价标准

基金：

广州交通大学引进人才科研启动项目广东省普通高校创新团队项目广东省重点建设学科科研能力提升项目

项目编号：

K420220072022KCXTD0242022ZDJS091

出版年：

2024

DOI：

10.19721/j.cnki.1001-7372.2024.06.019

中国公路学报

中国公路学会

中国公路学报

CSTPCD北大核心

影响因子：1.607

ISSN：1001-7372

年,卷(期)：2024.37(6)

参考文献量14