Effect of pre-grouting on the ground deformation and its mechanism in the construction of tunnels with small-spacing and large-section

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2025-01-01 DOI:10.1016/j.trgeo.2024.101458

Dechun Lu , Xu Meng , Qingtao Lin , Leilei Shi , Xiuli Du

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Abstract

The ground deformation is difficult to control in the construction of tunnels with small-spacing and large-section. Taking a crossover track tunnel in Beijing Metro line 12 as a case, a refined numerical model for tunnels with small-spacing and large-section is established to research the effect of pre-grouting on the ground deformation. Rationality of the numerical model is validated by the good consistence between the field measured simulated results, including the ground and pipelines settlement. Further, by comparing the results of numerical models with and without pre-grouting measures, the effect of pre-grouting measures on the ground deformation, involving in the settlement, horizontal displacement, and the plastic region, are analyzed quantitatively. The implementation of the pre-grouting measures reduces both the maximum settlement at surface and horizontal displacement by approximately 67.5 %, and the PEEQ distribution region is limited to the region outside the pre-grouting, and the moderate and severe disturbance areas are respectively reduced by 65 % and 80 %. Finally, the control mechanism of the pre-grouting on the ground deformation is revealed based on the strength-stiffness theory.

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小间距大断面隧道施工中预注浆对地面变形的影响及其机理

在小间距大断面隧道施工中，地面变形难以控制。以北京地铁12号线某交叉轨道隧道为例，建立了小间距大断面隧道的精细化数值模型，研究预注浆对地面变形的影响。现场实测的地面沉降和管道沉降模拟结果吻合较好，验证了数值模型的合理性。通过对比有预注浆措施和无预注浆措施的数值模型结果，定量分析了预注浆措施对地基沉降、水平位移和塑性区变形的影响。预灌浆措施的实施使地表最大沉降量和水平位移均减少了约67.5%，且PEEQ分布区域限制在预灌浆外区域，中度和重度扰动区分别减少了65%和80%。最后，基于强度-刚度理论，揭示了预注浆对地基变形的控制机理。

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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.