Study on settlement deformation law of new and old subgrade of expressway reconstruction and expansion based on CPTU

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-10-01 DOI:10.1016/j.trgeo.2024.101392
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Abstract

In the reconstruction and expansion of expressways in soft soil areas, controlling the differential settlement between the new and existing subgrades is of vital importance. To investigate the settlement and deformation characteristics of both the new and existing subgrades, piezocone penetration test (CPTU) and dissipation tests were conducted on these subgrades. The CPTU dissipation data was utilized to determine the soil’s degree of consolidation, and settlement calculations for the new and existing road subgrades were based on the CPTU test results. Subsequently, a finite element model was developed using the CPTU test findings to analyze the horizontal displacements, vertical settlements, and differential settlements of the new and existing subgrades before and after the reconstruction and expansion. Based on the measured settlement results, the new and old subgrade settlement calculation results are verified. The outcomes revealed that the degree of consolidation for the existing road subgrade of the Lianhuai Expressway ranged between 42 % and 96 %. The maximum horizontal displacement of the subgrade pre- and post-expansion occurred at the slope toe. Before expansion, the maximum vertical settlement was observed along the road’s centerline, while after expansion, it was located in the centerline of the widened section. The maximum additional settlement amounted to 274.77 mm. During the new road construction phase, the differential settlement between the new and existing road subgrades increased rapidly over time, peaking at its maximum value. However, during the operational phase of the new road, this differential settlement tapered off as time progressed.
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基于 CPTU 的高速公路改扩建工程新旧路基沉降变形规律研究
在软土地区改扩建高速公路时,控制新旧路基之间的差异沉降至关重要。为了研究新建路基和现有路基的沉降和变形特性,对这些路基进行了压强渗透试验(CPTU)和耗散试验。利用 CPTU 消能数据确定土壤的固结程度,并根据 CPTU 试验结果计算新建路基和现有路基的沉降量。随后,利用 CPTU 测试结果建立了有限元模型,分析改扩建前后新旧路基的水平位移、垂直沉降和差异沉降。根据测量的沉降结果,验证了新旧路基沉降计算结果。结果表明,连淮高速公路现有路基的固结度在 42 % 到 96 % 之间。路基在扩挖前后的最大水平位移出现在坡脚处。扩建前,最大垂直沉降沿道路中心线出现,而扩建后,最大垂直沉降位于扩建路段的中心线。最大额外沉降量为 274.77 毫米。在新道路施工阶段,新路基和现有路基之间的沉降差随着时间的推移迅速增大,并达到最大值。然而,在新道路的运营阶段,随着时间的推移,这种差异沉降逐渐减小。
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来源期刊
Transportation Geotechnics
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.
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