西安工业大学学报
西安工業大學學報
서안공업대학학보
JOURNAL OF XI'AN TECHNOLOGICAL UNIVERSITY
2013年
12期
974-981
,共8页
大断面软弱围岩隧道%洞口段%施工工法%交叉中隔壁法%双侧壁导坑法
大斷麵軟弱圍巖隧道%洞口段%施工工法%交扠中隔壁法%雙側壁導坑法
대단면연약위암수도%동구단%시공공법%교차중격벽법%쌍측벽도갱법
weak-rock tunnel%portal%construction method%CRD method%double sides heading method
山岭隧道建设条件复杂，通常洞口段埋深较浅、围岩破碎，在施工过程中易发生坍塌、边仰坡失稳等事故．根据某隧道洞口段地质情况、地形条件以及设计参数，对拟采用的交叉中隔壁法和双侧壁导坑法进行施工和数值分析对比．研究结果表明：从施工上看，采用交叉中隔壁法有利于工期；从数值分析看，采用交叉中隔壁法和双侧壁导坑法完成开挖后，隧道结构Y 向最大沉降分别为6．65 cm和1．68 cm ，临时支撑 X向最大变形分别为20．5 cm和4．42 cm ，采用后者施工变形更小；从计算结果看，采用双侧壁导坑法施工，围岩和隧道支护结构受力更小．采用交叉中隔壁法施工后，C25喷射混凝土Y 向最大拉应力为3．07 M Pa ，远大于采用双侧壁导坑法的1．27 M Pa ，且超过该喷射混凝土的极限抗拉强度．因此，从隧道变形和受力分析看，采用双侧壁导坑法施工更安全．
山嶺隧道建設條件複雜，通常洞口段埋深較淺、圍巖破碎，在施工過程中易髮生坍塌、邊仰坡失穩等事故．根據某隧道洞口段地質情況、地形條件以及設計參數，對擬採用的交扠中隔壁法和雙側壁導坑法進行施工和數值分析對比．研究結果錶明：從施工上看，採用交扠中隔壁法有利于工期；從數值分析看，採用交扠中隔壁法和雙側壁導坑法完成開挖後，隧道結構Y 嚮最大沉降分彆為6．65 cm和1．68 cm ，臨時支撐 X嚮最大變形分彆為20．5 cm和4．42 cm ，採用後者施工變形更小；從計算結果看，採用雙側壁導坑法施工，圍巖和隧道支護結構受力更小．採用交扠中隔壁法施工後，C25噴射混凝土Y 嚮最大拉應力為3．07 M Pa ，遠大于採用雙側壁導坑法的1．27 M Pa ，且超過該噴射混凝土的極限抗拉彊度．因此，從隧道變形和受力分析看，採用雙側壁導坑法施工更安全．
산령수도건설조건복잡，통상동구단매심교천、위암파쇄，재시공과정중역발생담탑、변앙파실은등사고．근거모수도동구단지질정황、지형조건이급설계삼수，대의채용적교차중격벽법화쌍측벽도갱법진행시공화수치분석대비．연구결과표명：종시공상간，채용교차중격벽법유리우공기；종수치분석간，채용교차중격벽법화쌍측벽도갱법완성개알후，수도결구Y 향최대침강분별위6．65 cm화1．68 cm ，림시지탱 X향최대변형분별위20．5 cm화4．42 cm ，채용후자시공변형경소；종계산결과간，채용쌍측벽도갱법시공，위암화수도지호결구수력경소．채용교차중격벽법시공후，C25분사혼응토Y 향최대랍응력위3．07 M Pa ，원대우채용쌍측벽도갱법적1．27 M Pa ，차초과해분사혼응토적겁한항랍강도．인차，종수도변형화수력분석간，채용쌍측벽도갱법시공경안전．
Construction conditions of mountain tunnel are very complex .Generally ,it is liable to the security risk event ,for example collapse and face-upward slope failure .In the construction of tunnel portal in the conditions of shallow buried depth and broken surrounding rock .CRD method and double sides heading method are applied and compared in the portals of some tunnel according to geological condition , terrain condition and design parameters . The results show :It is beneficial to shorten construction period with CRD method according to comparing construction procedures .The maximum vertical displacements of tunnel structure are 6 .65 cm and 1 .68 respectively when CRD method and double sides heading method are used ;Maximum horizontal convergences of the temporary supports are 6 .65 cm and 1 .68 respectively .It is obvious that the deformations are smaller when double sides heading method is used .Meanwhile ,it has been already proved by the calculation results that surrounding rock and supporting structures bear the smaller stresses .Especially ,maximum tensile stress reachs 3 .07 M Pa with CRD method and is more than ultimate tensile strength of C 25 shotcrete while maximum tensile stress of C25 shotcrete is 1 .27 MPa with double sides heading method .Therefore ,it is safer with double sides heading method in this tunnel according to deformation and stress analysis .
