Tunnel entrance crossing spoil heap deformations control by micropile combine with coupling beams  

作　　者：Chunwei Wu Han Xia Da Qin Junhui Luo 

机构地区：[1]Guangxi Beitou Transportation Maintenance Technology Group Co.,Ltd.,Nanning,530029,China [2]School of Transportation,Southeast University,Nanjing,211189,China [3]Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety,Southeast University,Nanjing,211189,China [4]Guangxi Communications Design Group Co.,Ltd.,Nanning,530029,China [5]Guangxi Beitou Transportation Maintenance Technology Group Co.,LTD.Nanning,530201,China

出　　处：《Geohazard Mechanics》2024年第1期21-28,共8页岩土灾变力学（英文）

基　　金：support from the Ministry of Transport of the People's Republic of China(Grant no.2021-ZD1-014);Key Research and Development Program of Guangxi(Grant no.2021AB22117).

摘　　要：Aiming at the deformation control problem of the tunnel entrance crossing the spoil heap at the Xialao junction,this paper adopts the micropile combined with the coupling beams method to treat the spoiled layers.The results show that the excavation of the tunnel after the construction of the micropile and coupling beam will cause vertical deformation of the tunnel and the slope surface.The main reason is that the soil layer structure is loose,and the tunnel excavation causes the whole displacement of the loose body.In addition,the buried depth of the tunnel is shallow,so it cannot form an effective soil arch.The stability process after the construction of the micropile method is the process of stress redistribution,and the rock and soil are gradually compressed and compacted.That is,the construction by the micropile method changes the surrounding rock level of the tunnel and reduces the height of the soil arch.Therefore,it is suggested that the tunnel excavation should be carried out when the micropile is constructed after the soil layers are consolidated completely.The micropile method treats the loose spoiled soil at the tunnel entrance,which saves 73%of the total cost compared with the scheme of directly digging out the accumulation,and the economic benefit is very obvious.

关 键 词：MICROPILE Coupling beams Spoil heap Deformation control 

分 类 号：U45[建筑科学—桥梁与隧道工程]