深覆盖砂卵石层钢板桩围堰模拟施工试验研究  

Experimental Study on Simulated Construction of Steel Sheet Pile Cofferdam in Deep Overburden Sand Gravel Layer

作　　者：田仲初[1] 丁滨阳 罗聿曼 罗朝华 丛培 汤宇 TIAN Zhongchu;DING Binyang;LUO Yuman;LUO Chaohua;CONG Pei;TANG Yu(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,China;First Engineering Company Limited of China Railway Fifth Bureau Group,Changsha 410000,China)

机构地区：[1]长沙理工大学土木工程学院,长沙410114 [2]中铁五局集团第一工程有限责任公司,长沙410000

出　　处：《铁道建筑》2021年第11期52-56,共5页Railway Engineering

基　　金：宁夏回族自治区重点研发计划(2021BEG02021)。

摘　　要：为解决钢板桩在黄河流域深覆盖砂卵石层地质条件下难以插打到位这一问题,基于工程现场8 m(长)×3 m(宽)×5 m(高)的钢板桩围堰平面缩尺模型和人工模拟的最不利砂卵石地质层,采用高压射水、改良钢板桩、水下引孔爆破等技术手段进行插打试验,研究钢板桩的插打对周边土体的挤压作用,对比分析不同插打方案的施工效率。结果表明:在最不利砂卵石地质层下,试验模型桩墙侧向土压力呈弧状分布,且砂卵石集料集配越密对钢板桩插打的阻碍作用越强;采用改良钢板桩和水下引孔爆破技术能够提高钢板桩的沉桩效率,为类似工程提供了一种钢板桩围堰辅助沉桩技术。In order to solve the problem that it is difficult to insert and drive steel sheet piles in place under the geological conditions of the deep overburden sand gravel layer in the Yellow River Basin,based on the plane scale model of steel sheet pile cofferdam with size of 8 m(length)× 3 m(width)× 5 m(height)in the project site and the most unfavorable sand gravel geological layer artificial simulation,the insertion and driving test was carried out by using technical means such as high-pressure water jetting,improved steel sheet pile and underwater pilot hole blasting. The extrusion effect of steel sheet pile on the surrounding soil was studied,and the construction efficiency of different inserting and driving schemes was analyzed and compared. The results show that the overall variation law of lateral earth pressure of pile wall of the test model is arc-shaped under the most unfavorable sand gravel geological layer,and the denser the sand gravel aggregate is,the stronger the hindrance to the inserting and driving of steel sheet pile is. By adopting improved steel sheet pile and underwater pilot hole blasting technology,the pile sinking efficiency of steel sheet pile can be improved,and an auxiliary pile sinking technology of steel sheet pile cofferdam is provided for similar projects.

关 键 词：钢板桩 深覆盖层 模拟试验 卵石 爆破 引孔 

分 类 号：U443.162[建筑科学—桥梁与隧道工程]