水平排水板真空预压技术在软土加固中的应用

Consolidation solution and application of vacuum preloading technology using prefabricated horizontal drains in land reclamation

摘要

对于吹填土加固处理，常用的方法包括应用竖向排水板联合堆载或者真空预压。然而，这些方法通常耗时且风险较高。所以，应开发更为有效的技术以节约成本并缩短吹填土加固工期。近年来，水平排水板(prefabricated horizontal drains, PHDs)联合真空固结技术已被开发，并且应用于相关现场试验。基于椭圆横截面以及等应变条件提出了一种针对水平排水板软土固结的求解方法。与柴氏方法及有限元方法(FEM)进行了比较。新方法和有限元法得出的结果之间显示出良好的一致性。而且，名义折减系数f^*_a与f^*_p与柴氏方法中的折减系数f_a与f_b一致。同现场试验的数据观测进行了对比分析，水平排水板真空预压的求解方法能很好模拟水平排水板对软土的加固效果。

Abstract

For land reclamation of soft soil, common method include the use of prefabricated vertical drains combined with surcharge or vacuum preloading. However, these method are often time-consuming and risky. To improve efficiency and reduce costs, new technologies are needed. Recently, prefabricated horizontal drains(PHDs) combined with vacuum preloading have been developed and tested in field experiments. A a solution was proposed for soft soil consolidation using prefabricated horizontal drains, based on an elliptical cross-section and the equal strain condition. The method is compared with both the Chai's method and the finite element method(FEM). The result show a strong agreement between the proposed method and FEM result. Additionally, the nominal reduction coefficients of this method, f^*_a and f^*_p, align with the coefficients from Chai's method, f_a and f_b. Field experiment data are also used for comparison, demonstrating that the proposed solution effectively simulates the vacuum consolidation behavoiur using PHDs. The method offers a promising alternative to traditional ones by potentially saving time and reducing the risks involved in land reclamation.

关键词

水平排水板 / 等应变法 / 椭圆截面 / 折减系数 / 有限元法 / 现场试验

Key words

horizontal drainage boards / equal strain method / elliptical cross-section / reduction factor / finite element method / in-situ experiments

Author summay

吴德剑(1990—), 男, 工程师, 学士, 主要从事海洋油气平台运输安装, 油气管道铺设, 海上风电运输安装等研究。E-mail: [e-mail]