坪田浅埋偏压隧道二次衬砌开裂机理及处治措施
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摘要
以武(汉)深(圳)高速公路坪田浅埋偏压隧道为研究对象,首先基于隧道二次衬砌开裂情况分析了二次衬砌开裂的影响因素,然后通过有限元分析软件MIDAS GTS NX模拟双侧壁导坑法施工过程,分析了二次衬砌开裂机理。结果表明:二次衬砌最大拉应力区主要集中在拱顶偏左拱腰和仰拱处,其值接近或超过二次衬砌混凝土抗拉强度设计值;裂缝基本分布在侧向偏压作用线两侧。结合监测数据和二次衬砌实际开裂情况,最终对隧道采取了"洞内临时支撑+底板注浆+洞外坡体注浆"的综合处治方案。
Taking the Pingtian shallowburied bias tunnel of Wuhan to Shenzhen expressway as the research object,the influencing factors of secondary lining crack were analyzed based on the crack situation of tunnel secondary lining,the construction process of double side drift method was simulated by f inite element analysis software M ID AS G TS N X,and the crack mechanismof secondary lining was analyzed. The results showthat the maximumtensile stress zone of the secondary lining mainly concentrates on the left arch waist of the vault and the inverted arch,which value is close to or more than the tensile strength design value of the secondary lining concrete,and the cracks are basically distributed on both sides of the lateral bias action line.Combining the monitoring data and the actual crack of the secondary lining,the comprehensive treatment scheme of "temporary support in the cave + floor grouting +grouting outside the cave"was adopted for tunnel.
Taking the Pingtian shallowburied bias tunnel of Wuhan to Shenzhen expressway as the research object,the influencing factors of secondary lining crack were analyzed based on the crack situation of tunnel secondary lining,the construction process of double side drift method was simulated by f inite element analysis software M ID AS G TS N X,and the crack mechanismof secondary lining was analyzed. The results showthat the maximumtensile stress zone of the secondary lining mainly concentrates on the left arch waist of the vault and the inverted arch,which value is close to or more than the tensile strength design value of the secondary lining concrete,and the cracks are basically distributed on both sides of the lateral bias action line.Combining the monitoring data and the actual crack of the secondary lining,the comprehensive treatment scheme of "temporary support in the cave + floor grouting +grouting outside the cave"was adopted for tunnel.
引文
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[4]肖建章,戴福初,闵弘,等.浅埋偏压堆积体围岩隧道二次衬砌开裂机理分析[J].现代隧道技术,2013,50(6):101-109.
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[6]李勇锋,李涛,徐颖,等.浅埋偏压软岩隧道二衬开裂力学机理研究[J].铁道建筑,2013,53(11):67-69.
[7]雷明锋,彭立敏,施成华,等.浅埋偏压隧道衬砌受力特征及破坏机制试验研究[J].中南大学学报(自然科学版),2013,44(8):3316-3324.
[8]张连成,闫小波,邓涛.浅埋隧道边坡滑移与衬砌开裂病害分析[J].福州大学学报(自然科学版),2011,39(2):281-286.
[9]陈伟,阮怀宁,张辉,等.降雨入渗对浅埋偏压隧道及其支护系统的影响[J].现代隧道技术,2008,45(1):30-34.
[10]王胜军.Midas GTS在浅埋偏压隧道开挖分析中的应用[J].土工基础,2013,27(2):75-78.
[2]王英学,周佳媚,高波.偏压滑坡地段围岩受力特征测试分析[J].岩土力学,2002,23(6):792-794.
[3]张维.浅埋偏压软岩隧道洞口段失稳原因分析及其施工对策[J].公路交通科技(应用技术版),2012(4):272-276.
[4]肖建章,戴福初,闵弘,等.浅埋偏压堆积体围岩隧道二次衬砌开裂机理分析[J].现代隧道技术,2013,50(6):101-109.
[5]苏永华,梁斌,伍文国.越岭浅埋偏压隧道支护系统承载特性分析[J].湖南大学学报(自然科学版),2012,39(2):1-6.
[6]李勇锋,李涛,徐颖,等.浅埋偏压软岩隧道二衬开裂力学机理研究[J].铁道建筑,2013,53(11):67-69.
[7]雷明锋,彭立敏,施成华,等.浅埋偏压隧道衬砌受力特征及破坏机制试验研究[J].中南大学学报(自然科学版),2013,44(8):3316-3324.
[8]张连成,闫小波,邓涛.浅埋隧道边坡滑移与衬砌开裂病害分析[J].福州大学学报(自然科学版),2011,39(2):281-286.
[9]陈伟,阮怀宁,张辉,等.降雨入渗对浅埋偏压隧道及其支护系统的影响[J].现代隧道技术,2008,45(1):30-34.
[10]王胜军.Midas GTS在浅埋偏压隧道开挖分析中的应用[J].土工基础,2013,27(2):75-78.