硬岩条件下的隧道采用单层衬砌能够有效减小施工成本,提高施工效率,但有关单层衬砌稳定性及结构强度相关研究较少。为了分析硬岩隧道中聚烯烃纤维混凝土单层衬砌的服役性能,本文分别通过混凝土力学性能试验、现场监测以及数值模拟等手段与同等级素混凝土单层衬砌进行对比分析。结果表明:(1)聚烯烃纤维混凝土具备更高的强度及韧性,纤维能够抑制裂缝的开展,变形过程中呈现出更好的塑性特征;(2)Ⅱ级围岩下采用聚烯烃纤维混凝土进行单层衬砌地表沉降较小,能够满足结构所需的强度及稳定性;(3)聚烯烃纤维混凝土单层衬砌比复合式衬砌每延米造价节省5.3%。
The use of single-layer linings in hard-rock tunnels can effectively reduce construction costs and improve construction efficiency, but there are few studies on the stability and structural strength of single-layer linings. In order to analyze the performance of single-layer polyolefin fiber concrete lining in hard rock tunnels, this paper compares and analyses the single-layer lining with the same grade of plain concrete using concrete mechanical property tests, on-site monitoring, and numerical simulation. The results show that: 1) polyolefin fiber concrete has higher strength and toughness, the fibers are able to inhibit cracking and have better plasticity properties during deformation; 2) the use of polyolefin fiber concrete single-layer lining under the Ⅱ-perimeter rock surface settlement is small, and it can meet the required structural strength and stability; 3) compared with the single-layer lining of polyolefin fiber concrete than composite lining cost savings of 5.3% per linear meter.
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