Liquefaction-induced damage evaluation of earth embankment and corresponding countermeasure
Liquefaction-induced damage evaluation of earth embankment and corresponding countermeasure
复制标题
土堤液化损伤评价及对策
DOI：
10.1007/s11709-022-0848-7
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发表时间：
2022-09
影响因子：
3
通讯作者：
Feng Zhang
中科院分区：
文献类型：
--
作者：
Linlin Gu;Wei Zheng;Wenxuan Zhu;Zhen Wang;Xianzhang Ling;Feng Zhang
砂质土的液化严重威胁着饱和土路基的稳定性和安全性。在世界范围内，由于不同类型的地震而引起的路基液化损伤已被大量报道。本文对中震eq1和强震EQ2作用下土路堤的动力特性和注浆加固效果进行了数值研究。循环迁移率模型统一描述了无黏性砂土和粘性粘土地基的地震行为，该模型考虑了应力诱导的各向异性、超固结和土体结构等因素，能够准确地描述单调和循环荷载作用下土体的力学特性。通过数值研究可知，路堤会发生破坏性变形，其破坏模式与输入地震运动的性质密切相关，因为高强度和长时间的地震运动会导致显著的塑性变形和土壤液化时间延长。在EQ2强地震荷载作用下，液化带内出现圆形塌陷面，并伴有巨大的沉降和横向扩展，并向路堤顶部延伸。相比之下，在EQ1中度地震中，在路堤的每个趾部都观察到隆起，而不稳定仅发生在液化地面。通过注浆进行反液化修复可以显著减少液化引起的变形（沉降、横向扩展和局部隆升），抑制深层圆形滑动破坏，即使在两次地震中顶部砂土液化。当结构受到eq2运动时，注浆加固路堤边坡发生局部破坏，需要采取相应的对策进一步加固边坡。对于两种输入运动，考虑路堤的表面变形都随着配筋厚度的增加而逐渐减小，但当配筋厚度超过6 m时，加固效果不再显著。
Liquefaction of sandy soils is a big threat to the stability and the safety of an earth embankment laid on saturated soils. A large number of liquefaction-induced damages on embankment due to different types of earthquakes have been reported worldwide. In this research, the dynamic behaviors of earth embankment and the reinforcement effects of grouting as remediation method, subjected to moderate earthquake EQ1and strong earthquake EQ2, were numerically investigated. The seismic behaviors of ground composed of cohesionless sandy soil and cohesive clayey soil were uniformly described by the cyclic mobility (CM) model, which is capable of describing accurately the mechanical property of the soil due to monotonic and cyclic loadings by accounting for stress-induced anisotropy, over-consolidation, and soil structure. It is known from the numerical investigation that the embankment would experience destructive deformation, and that the collapse mode was closely related to the properties of input seismic motion because high intensities and long durations of an earthquake motion could lead to significant plastic deformation and prolonged soil liquefaction. Under the strong seismic loading of EQ2, a circular collapse surface, combined with huge settlement and lateral spread, occurred inside the liquefication zone and extended towards the embankment crest. In contrast, in moderate earthquake EQ1, upheaval was observed at each toe of the embankment, and instability occurred only in the liquefied ground. An anti-liquefaction remediation via grouting was determined to significantly reduce liquefaction-induced deformation (settlement, lateral spreading, and local uplift) and restrain the deep-seated circular sliding failure, even though the top sandy soil liquefied in both earthquakes. When the structure was subjected to EQ2motion, local failure occurred on the embankment slope reinforced with grouting, and thus, an additional appropriate countermeasure should be implemented to further strengthen the slope. For both input motions, the surface deformation of the considered embankment decreased gradually as the thickness of reinforcement was increased, although the reinforcement effect was no longer significant once the thickness exceeded 6 m.
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DOI：
10.1016/0148-9062(91)90518-q
发表时间：
1990-12
期刊：
--
影响因子：
--
作者：
古賀 泰之;松尾 修
通讯作者：
古賀 泰之;松尾 修
DOI：
10.1201/b17435-116
发表时间：
2014-09
期刊：
--
影响因子：
--
作者：
H. Ishikawa;K. Saito;K. Nakagawa;R. Uzuoka
通讯作者：
H. Ishikawa;K. Saito;K. Nakagawa;R. Uzuoka
影响因子：
7.4
作者：
E. Fern;D. Lange;C. Zwanenburg-;J. Teunissen;A. Rohe;K. Soga
通讯作者：
E. Fern;D. Lange;C. Zwanenburg-;J. Teunissen;A. Rohe;K. Soga
影响因子：
4
作者：
Zhe Wang;Yunming Yang;Hai-Sui Yu;K. Muraleetharan
通讯作者：
Zhe Wang;Yunming Yang;Hai-Sui Yu;K. Muraleetharan
DOI：
10.1061/(asce)0733-9410(1996)122:1(7
发表时间：
1993
期刊：
Journal of Geotechnical Engineering
影响因子：
--
作者：
W. F. Marcuson;P. Hadala;R. Ledbetter
通讯作者：
W. F. Marcuson;P. Hadala;R. Ledbetter