考虑河床冲刷和水位差的土工管袋围堰稳定性研究  

Stability of Geotextile Cofferdam Considering the Riverbed Scouring and Differences of Water Level

作　　者：陈强[1] 毛建东 李建雄 史吏 胡敏[1] 许嘉豪 CHEN Qiang;MAO Jian-dong;LI Jian-xiong;SHI Li;HU Min;XU Jia-hao(HydroChina Huadong Engineering Corporation,Hangzhou 310000,China;Zhejiang Qiantang River Basin Centre,Hangzhou 310020,China;College of Civil Engineering,Zhejiang University of Techonology,Hangzhou 310014,China)

机构地区：[1]中国电建华东勘测设计研究院有限公司,浙江杭州310000 [2]浙江省钱塘江流域中心,浙江杭州310020 [3]浙江工业大学土木工程学院,浙江杭州310014

出　　处：《水电能源科学》2024年第7期91-95,共5页Water Resources and Power

基　　金：浙江省水利厅科技项目(RB2123)。

摘　　要：土工管袋围堰结构虽建造成本低、施工便捷,但在复杂地质条件与水位差联合作用下,服役期常出现地基滑动失稳或管袋张拉破坏等工程事故。为此,以钱塘江某河口地区管袋围堰工程为依托,基于动床水槽模型与管袋围堰数值模型明确了不同潮期工况下地基塑性应变和管袋张拉力分布特性,以容许稳定性系数和管袋材料抗拉强度为控制指标,从地基滑动失稳和管袋张拉破坏两个角度提出了管袋整体稳定的临界工况。研究结果表明,当地基淘刷深度在3 m以内时,地基仍能保持1.16以上的稳定性系数,但随着冲刷深度增加,管袋材料会发生张拉破坏。当淘刷深度达到5 m时,地基稳定性系数降低为1.1,且管袋材料张拉破坏已无法避免。Although geotextile tube cofferdams offer the advantages of low construction costs and ease of implementation,their operational lifespans are frequently marred by engineering accidents such as foundation sliding instability and tensile failure of the geotextile tubes.These accidents are often precipitated by the combined influence of complex geological conditions and water level fluctuations.This study is anchored on a geotextile tube cofferdam project situated at a specific estuary of the Qiantang River.Utilizing a movable bed flume model and a numerical model for the geotextile tube cofferdam,we ascertained the distribution characteristics of foundation plastic strain and geotextile tube tensile forces under different tidal conditions.Employing the allowable stability coefficient and the tensile strength of the geotextile material as control parameters,the critical conditions for the overall stability of the geotextile tube cofferdam was identified from the perspectives of both foundation sliding instability and geotextile tube tensile failure.The findings reveal that when the foundation scouring depth is within 3 meters,the stability coefficient remains above 1.16.However,as the scouring depth increases,tensile failure of the geotextile material becomes inevitable.When the scouring depth reaches 5 meters,the stability coefficient of the foundation decreases to 1.1,and tensile failure of the geotextile tube material can no longer be averted.

关 键 词：管袋围堰 冲刷坑 水位差 地基稳定性 抗拉强度 

分 类 号：TV36[水利工程—水工结构工程] TV551.3