铁道科学与工程学报2024，Vol.21Issue(6)：2384-2395,12.DOI:10.19713/j.cnki.43-1423/u.T20231337
不同缩尺下悬索桥隧道锚原位模型承载特性试验研究
Experimental study on bearing characteristics of in-situ model of tunnel-type anchorage for a suspension bridge under different scales
摘要
Abstract
To study the influences of the scale effect on testing results,different scale models of the tunnel-type anchorage of the suspension bridge on the Jinsha River at Lijiang City were established.In-situ experimental tests were carried out with these models according to the similarity theory,yielding the response laws on deformation characteristics,rheological characteristics,potential failure modes,and overload performance under various loading conditions.The deformation patterns and failure characteristics of the anchoring concrete-plug and the surrounding rock at different stress levels were obtained by the comprehensive use of the multi-point displacement meters,strain gauges,and pressure cells.By using the gas-liquid loading system,the long-term deformation and bearing characteristics during the entire creep process of the anchor plug and the surrounding rock were obtained at loading pressures of 0.824 MPa and 2.472 MPa.The testing results indicated that the deformation of the anchoring concrete-plug was relatively large during the rheological stage.The compaction of joints and fissures in the surrounding rock was gradually improved with the loads increasing,among which the compaction of rock fissures with the 1∶12 scale model occurred mainly during loading of the first load level and with the 1∶20 scale model occurred mainly at the load of the third level.The overall deformation characteristics were generally consistent for the 1∶12 and 1∶20 scale models,though the deformation of the latter was larger.This indicated that the degree of fragmentation of the surrounding rock was adverse to the stability of tunnel-type anchorage.The distribution of deformation at the rear surface of the anchor and the surrounding rock surface was saddle-shaped with the 1∶12 scale model and was bimodal-shaped with the 1∶20 scale model.For both models,the residual deformation on the plate of the anchoring concrete-plug and surrounding rock was high.This research can be referred to in future studies on bearing characteristics of the tunnel-type anchorage of suspension bridges with scale modes.关键词
悬索桥/隧道锚/原位模型试验/缩尺效应/承载特性Key words
suspension bridge/tunnel-type anchorage/in-situ model experiment/scale effect/bearing characteristics分类
建筑与水利引用本文复制引用
茆大炜,杜少华,左成荣,梅松华..不同缩尺下悬索桥隧道锚原位模型承载特性试验研究[J].铁道科学与工程学报,2024,21(6):2384-2395,12.基金项目
国家自然科学基金资助项目(42202318) （42202318）
