摘要
粉煤灰地层具有孔隙比大,渗水性强,黏聚力小,强度低等特点,因此会造成其承载力低、地表沉降大等工程问题。本文依托盐坪坝连拱隧道,选取了其中具有代表性的穿越粉煤灰的K0+570~K0+630区段,采用数值模拟的方法研究不同开挖工法下地表沉降规律,研究结果表明采用中导洞-左右侧壁预留核心土法开挖时相较中导洞-左右侧壁台阶法对地表沉降变形速率的控制效果更好,二者对地表沉降量的影响区别不大,最大沉降量约19 mm,根据比选结果中导洞-左右侧壁预留核心土法更有利于控制地表沉降。
Coal ash stratum has the characteristics of large void ratio,strong permeability,small cohesion and low strength,so it will cause engineering problems such as low bearing capacity and large surface settlement.Based on the Yanpingba multiarch tunnel,this paper selects the representative sections of K0+570~K0+630 passing through fly ash,and uses the numerical simulation method to study the surface settlement law under different excavation methods.The results show that the control effect of the middle pilot tunnel-left and right side wall reserved core soil method on the surface settlement deformation rate is better than that of the middle pilot tunnel-left and right side wall bench method.There is little difference between the two on the ground settlement,the maximum settlement is about 19 mm.According to the results of the comparison,the pilot tunnel-the left and right side wall reserved core soil method is more conducive to controlling surface settlement.
作者
李希文
游红军
张粒
李梦可
费虎
LI Xiwen;YOU Hongjun;ZHANG Li;LI Mengke;FEI Hu(Sichuan Road and Bridge(Group)Co.,Ltd.,Chengdu Sichuan 610093,China;Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《交通节能与环保》
2021年第4期139-142,共4页
Transport Energy Conservation & Environmental Protection
关键词
双连拱隧道
粉煤灰地层
开挖方式
数值模拟
地表沉降规律
double-arch tunnel
layer of pulverized coal ash
excavation methods
numerical simulation
ground surface settlement laws
