| Metro line 1 zhongshan square station-the liberation of shijiazhuang square station wiring tunnel is located in the main shopping street below new hundred square to the train station,along the west of shandong is decorated,line for line around separate double hole,tunnel local for three LianDong tunnel,total length of 385.44 m,cross section has A ~ J section,A total of 10 kinds of types,frequent transformation,the biggest excavation section 14.3 m wide,height 10.75 meters,the minimum cross section width 6.5 m.Excavation method from section to section followed by step method,temporary inverted arch method,CRD method,double wall pilot tunnel method of excavation method.Tunnel overburden soil thickness is about 8.6 m to 10.6 m,arch is located in the silty sand layer,clear distance between holes 0.75 m to 0.75 m above the tunnel has the multiple parallel pipeline such as water supply,sewage and rainwater,local have leakage phenomenon,dawn street crossing tunnel under wear,the bottom of the channel from the vault 1.45 m.The long subway tunnel shallow buried sand layer complex geological conditions,cross section forms a complex,excavation support mutual crisscross,stress variation of surrounding rock and lining load conversion is very complex.By studying the shallow buried tunnel grouting sand layer,small clear distance parallel with heavy section tunnel construction,the method of conversion,and variable cross-section tunnel temporary support to dismantle and secondary lining construction technology,to solve the large span variable cross-section small net cross cross the line from the subway and silty sand layer of shallow buried underground tunnel construction,so that in the future to solve in silty sand layer grouting in low permeability reservoir is difficult;For complex section tunnel method conversion;Small clear distance parallel with heavy section tunnel construction sequence and other underground construction problems at any time. |
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