堆积层边坡与平行穿越隧道相互作用试验研究
Experimental Study of the Interaction between a Mounded Slope and a Parallel Crossing Tunnel
张永杰 1陈明军 1邓沛宇 1罗志敏 1胡涛1
作者信息
- 1. 长沙理工大学土木工程学院,长沙 410114
- 折叠
摘要
为探讨堆积层边坡坡体变形挤压力对平行穿越隧道支护结构的作用规律,以实际工程为原型,通过大型室内模型试验,探讨堆积层边坡平行穿越隧道在坡体变形挤压力作用下的承载受力变形致灾机理.结果表明:变形挤压力模拟荷载在16～48 kN期间,坡面未发生明显变形,基岩与堆积层交界区域隧道拱顶出现拉应力集中,基岩与堆积层交界区域的隧道拱底受压;模拟荷载在48～64 kN期间,隧道洞口区域坡面出现裂缝,隧道拱顶向下弯曲变形,基岩与堆积层交界区域的隧道拱顶应变突变,并发生开裂;模拟荷载在64～80 kN期间,坡体表面发生局部垮塌,隧道位移发生突变,隧道受到的坡体挤压力集中于靠近基岩1/3处拱顶,隧道抵抗坡体挤压变形的能力逐渐丧失,边坡失稳.建议在隧道洞口上方坡体设置锚索进行加固,对基岩与堆积层坡体交界面附近的隧道支护结构采用衬砌加厚、套拱等措施.
Abstract
In order to study the effect of deformation and extrusion force on the supporting structure of parallel crossing tunnel,a large-scale indoor model test was carried out,the mechanism of bearing capacity,deformation and disaster caused by the deformation of a parallel tunnel through a layered slope is discussed.The test results show that:No obvious deformation occurs on the slope,and the tensile stress concentration appears in the tunnel vault at the boundary between the bedrock and the deposit layer during the 16～48 kN.When the simulated load is 48～64 kN,the crack appears on the slope of the tunnel entrance area,and the arch top of the tunnel bends downward.During the period of 64～80 kN,the surface of the slope collapsed locally and the displacement of the tunnel changed suddenly.The compression force of the tunnel is concentrated on the vault near the 1/3 of the bedrock,and the ability of the tunnel to resist the compression deformation of the slope is gradually lost,and the slope is unstable.It is suggested that the slope above the tunnel entrance should be reinforced with anchor cables,and the lining and arch lining should be adopted for the support structure near the interface between the bedrock and the deposit slope.
关键词
模型试验/隧道-滑坡/变形破坏/松散堆积边坡/室内监测Key words
model test/tunnel-landslide/deformation failure/loose accumulation slope/indoor monitoring引用本文复制引用
基金项目
国家自然科学基金(51878071)
国家自然科学基金(52178416)
土木工程优势特色重点学科创新性项目(18ZDXK08)
出版年
2023
NETL
NSTL
万方数据