Shaking table model test on seismic performance of retaining slope with ECC anti-sliding sheet pile wall

SHEN Jianlin; DING Xuanming; WU Qi; LIU Xuecheng

doi:10.11835/j.issn.2096-6717.2023.001

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Shaking table model test on seismic performance of retaining slope with ECC anti-sliding sheet pile wall

Civil Engineering | 更新时间：2023-09-19

- Shaking table model test on seismic performance of retaining slope with ECC anti-sliding sheet pile wall
- Journal of Civil and Environmental Engineering Vol. 45, Issue 5, Pages: 81-93(2023)
- 作者机构：
  
  1.重庆大学土木工程学院;山地城镇建设与新技术教育部重点实验室,重庆 400045
  2.重庆大学溧阳智慧城市研究院,江苏溧阳 213300
- 作者简介：
  
  SHEN Jianlin (1998- ), main research interest: slope engineering, E-mail: sjlcqu@163.com.
  DING Xuanming （corresponding author）, professor, PhD, E-mail: dxmhhu@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(52178312);Chongqing Talents Program(cstc2021ycjh-bgzxm0051)
- DOI：10.11835/j.issn.2096-6717.2023.001
  CLC： TU435
- Received：07 August 2022，
  
  Published：25 October 2023
- 稿件说明：
移动端阅览
SHEN Jianlin, DING Xuanming, WU Qi, et al. Shaking table model test on seismic performance of retaining slope with ECC anti-sliding sheet pile wall[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 81-93.
DOI：

SHEN Jianlin, DING Xuanming, WU Qi, et al. Shaking table model test on seismic performance of retaining slope with ECC anti-sliding sheet pile wall[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 81-93. DOI： 10.11835/j.issn.2096-6717.2023.001.

摘要

在强震作用下，传统桩板墙支护结构易出现不可恢复的损伤和变形，工程水泥基复合材料（ECC）具有较高的抗拉强度和拉应变硬化特性，在约束裂缝开展、抗弯承载力及耗能能力上优于普通钢筋混凝土，但ECC桩板墙支护结构的抗震性能尚不明确。由此，开展ECC桩板墙支护结构（ECC桩板）和普通钢筋混凝土浇筑的桩板墙支护结构（RC桩板）振动台试验，对比其动力响应和破坏特性。结果表明：ECC桩板的抗震性能优于RC桩板；在相同的地震动作用下，ECC桩板支护下边坡的动力响应小于RC桩板支护时，在更高强度的地震动作用下，相同材料强度的ECC桩板可保证边坡稳定性；在动力作用下，ECC桩板和RC桩板表现出较明显的弹性和弹塑性，在输入地震动较小时，两种支护结构的动力响应较为一致；当输入地震动峰值较大时，ECC桩板支护下边坡的加速度放大系数为RC桩板支护下的0.77~0.9倍，ECC桩板和RC桩板的桩背动土压力分布都表现为“双峰型”，RC桩背动土压力峰值为ECC桩背的5倍左右；两种支护结构的桩顶残余位移与震级呈指数关系，RC桩板的桩顶残余位移为ECC桩板的2倍。破坏阶段，ECC桩板仅在嵌固端面出现多条细微裂缝，RC桩板出现抗弯破坏特征，钢筋和混凝土相对滑移明显，位移不可控。

Abstract

The traditional anti-sliding sheet pile wall is prone to irreparable damage and deformation under strong earthquake. Engineered Cementitious Composite (ECC) has high tensile strength and tensile strain hardening characteristics

and is superior to conventional reinforced concrete in terms of restricting crack development

bending capacity and energy dissipation capacity. But the seismic performance of ECC anti-sliding sheet pile wall supporting structure is not clear yet. Therefore

shaking table tests are carried out on ECC pile-sheet wall (ECC pile-sheet) and RC pile-sheet wall (RC pile-sheet) to compare their dynamic response and failure characteristics. The results show that the seismic performance of ECC pile-sheet is better than that of RC pile-sheet. Under the same ground motion amplitude input

the dynamic response of the slope under ECC pile-sheet is less significant than that under RC pile-sheet

and the ECC pile-sheet with the same compressive strength can ensure the stability of the slope under the action of higher ground motion. ECC pile-sheet and RC pile-sheet show obvious elastic and elastic-plastic stages under dynamic action

and the dynamic responses of the two pile-sheet are consistent when the ground motion is small. When the amplitude of ground motion is large

the acceleration amplification coefficient of slope under ECC pile-sheet is 0.77-0.9 times that under RC pile-sheet. The soil pressure distribution of ECC pile-sheet and RC pile-sheet is "bimodal"

and the peak of soil pressure behind RC pile is about 5 times that of ECC pile. The pile top residual displacement and magnitude of the two pile-sheet are distributed in exponential form

and the residual displacement of RC pile sheet is twice that of ECC pile-sheet. In the failure stage

ECC pile-sheet only has several fine cracks on the fixed part

RC pile-sheet is of bending failure characteristics

steel bar and concrete slip obviously

and the displacement is uncontrollable.

关键词

Keywords

references

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