Upward soil arching effect under unloading: mechanism, theory and engineering application

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2024-05-22 DOI:10.1016/j.trgeo.2024.101276

Ren-Peng Chen , Han-Lin Wang , Xiang-Shen Fu , Fanyan Meng , Qi-Wei Liu , Xing-Tao Lin

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引用次数: 0

Abstract

Upward soil arching effect under unloading indicates the unloading part moves in a vertically downward direction, generating the arching zone and the loosened zone towards an upward direction. This study presents a summary of definitions, characteristics, theoretical models and engineering applications for the upward soil arching effect under unloading. The evolution of the upward soil arching effect is highly related to the unloading/differential displacement. The characteristics of the upward soil arching effect under unloading are comprehensively interpreted in terms of the normalized height of arching, the minimum soil arching ratio (at which state the maximum arching is developed) and the normalized unloading displacement to reach the maximum arching state. Two deformation-dependent theoretical models are introduced, to appropriately interpret and predict the variation of the soil arching ratio with the normalized unloading displacement (i.e., the ground reaction curve). Using the research findings for the upward soil arching effect under unloading, the settlement of the geosynthetic-reinforced pile-supported embankment as well as the face stability and ground settlement during tunnelling are proven to be precisely predicted and well controlled.

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卸载下的土壤上拱效应：机理、理论与工程应用

卸载下的土壤上拱效应表示卸载部分垂直向下移动，产生拱起带和朝上方向的松动带。本研究概述了卸载作用下土壤上拱效应的定义、特征、理论模型和工程应用。土体上拱效应的演变与卸载/差异位移高度相关。从归一化起拱高度、最小土壤起拱比率（在此状态下形成最大起拱状态）和达到最大起拱状态的归一化卸载位移三个方面全面解释了卸载下土壤上拱效应的特征。引入了两个与变形有关的理论模型，以适当解释和预测土壤起拱比随归一化卸载位移（即地面反力曲线）的变化。利用对卸载时土体上拱效应的研究成果，证明了土工合成材料加固桩支撑路堤的沉降以及隧道开挖过程中的路面稳定性和地面沉降是可以精确预测和良好控制的。

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.