铁道工程学报
鐵道工程學報
철도공정학보
Journal of Railway Engineering Society
2015年
10期
86-92
,共7页
大断面黄土隧道%三台阶法%CRD法%双侧壁导坑法%适用条件
大斷麵黃土隧道%三檯階法%CRD法%雙側壁導坑法%適用條件
대단면황토수도%삼태계법%CRD법%쌍측벽도갱법%괄용조건
large cross section loess tunnel%three steps method%CRD method%double side heading method%suitable conditions
研究目的：大断面黄土隧道开挖可采用双侧壁导坑法、CRD法、台阶法等，本文依托郑州至西安高速铁路大断面黄土隧道工程实例，通过对三种常用工法的理论分析，并结合现场初期支护下沉收敛、地表沉降的监测，对比分析各种工法的优缺点，提出适用于高速铁路大断面黄土隧道安全快速的开挖方法。研究结论：（1）在三台阶七步法、CRD法及双侧壁导坑法中，初期支护在施作二次衬砌前的安全系数分别为1．3、1．4、2．6，CRD法及双侧壁导坑法临时支护安全系数最小值为1．2、1．9，均能保证施工阶段的安全；（2）地表沉降值和黄土性质关联性更强，采用三台阶七步法和CRD法开挖，地表沉降值均在10 cm以上，双侧壁导坑法可将地表沉降值控制在5 cm以内；（3）高速铁路大断面黄土隧道无特殊情况下宜采用三台阶七步法开挖；（4）本研究成果可为类似断面工程的施工提供借鉴。
研究目的：大斷麵黃土隧道開挖可採用雙側壁導坑法、CRD法、檯階法等，本文依託鄭州至西安高速鐵路大斷麵黃土隧道工程實例，通過對三種常用工法的理論分析，併結閤現場初期支護下沉收斂、地錶沉降的鑑測，對比分析各種工法的優缺點，提齣適用于高速鐵路大斷麵黃土隧道安全快速的開挖方法。研究結論：（1）在三檯階七步法、CRD法及雙側壁導坑法中，初期支護在施作二次襯砌前的安全繫數分彆為1．3、1．4、2．6，CRD法及雙側壁導坑法臨時支護安全繫數最小值為1．2、1．9，均能保證施工階段的安全；（2）地錶沉降值和黃土性質關聯性更彊，採用三檯階七步法和CRD法開挖，地錶沉降值均在10 cm以上，雙側壁導坑法可將地錶沉降值控製在5 cm以內；（3）高速鐵路大斷麵黃土隧道無特殊情況下宜採用三檯階七步法開挖；（4）本研究成果可為類似斷麵工程的施工提供藉鑒。
연구목적：대단면황토수도개알가채용쌍측벽도갱법、CRD법、태계법등，본문의탁정주지서안고속철로대단면황토수도공정실례，통과대삼충상용공법적이론분석，병결합현장초기지호하침수렴、지표침강적감측，대비분석각충공법적우결점，제출괄용우고속철로대단면황토수도안전쾌속적개알방법。연구결론：（1）재삼태계칠보법、CRD법급쌍측벽도갱법중，초기지호재시작이차츤체전적안전계수분별위1．3、1．4、2．6，CRD법급쌍측벽도갱법림시지호안전계수최소치위1．2、1．9，균능보증시공계단적안전；（2）지표침강치화황토성질관련성경강，채용삼태계칠보법화CRD법개알，지표침강치균재10 cm이상，쌍측벽도갱법가장지표침강치공제재5 cm이내；（3）고속철로대단면황토수도무특수정황하의채용삼태계칠보법개알；（4）본연구성과가위유사단면공정적시공제공차감。
Research purposes:The large section loess tunnel excavation method can use double side heading method, CRD method and steps method,etc.Taking loess tunnel project of Zhengzhou to Xi'an high -speed railway as an example,based on theoretical analysis of three kinds of common construction methods,and combined with the primary support sinking of convergence,the surface subsidence monitoring,this paper compared and analyzed the advantages and disadvantages of various methods,proposed the safe and rapid excavation method suitable for large section loess tunnel of high-speed railway. Research conclusions:(1 )The safety coefficients of primary support of three steps and seven steps,CRD and double side heading method in applied in front of the secondary lining are 1.3,1.4 and 2.6,the temporary support minimum safety coefficients of CRD and double side heading tunnel method are 1 .2 and 1 .9 ,and all can meet the construction safety.(2)The correlation between surface subsidence value and the loess nature is stronger,using three steps and seven steps and CRD excavation method surface subsidence value is more than 10 cm,double side heading method can control the surface subsidence value within 5 cm.(3 )It is suitable to use three steps and seven steps excavation method in the large section loess tunnel of high -speed railway in the absence of any special.(4 )The research result can provide reference for similar projects.
