基于Asaoka法山岭公路隧道洞口浅埋段拱顶沉降预测分析  

Forecasting the Vault Subsidence of Portal Shallow Buried Section in Mountain Road Tunnel Based on Asaoka Method

作　　者：李海深[1,2] 刘丰[1] 马一跃[1] 李训根[1] 

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]湘潭市城乡规划局,湖南湘潭411100

出　　处：《湘潭大学自然科学学报》2013年第4期42-47,共6页Natural Science Journal of Xiangtan University

摘　　要：隧道进出洞口浅埋段由于埋置较浅且多为破碎岩体,施工对岩层的扰动较大易发生坍塌、冒顶事件,而及时地掌握隧道拱顶的最终沉降,确定最佳的支护时间能够有效的避免工程事故.Asaoka法能够利用较短期的观测资料得到较为可靠的最终沉降量推算值,被广泛用于路基沉降预测中,而隧道拱顶沉降预测中却很少涉及.为此,该文依托贵州某隧道进出口断面的拱顶沉降值,运用Asaoka法进行沉降预测分析.研究结果如下:在采用Asaoka法进行拱顶沉降预测时宜选用隧道开挖后10d内的沉降数据进行预测分析,且拱顶沉降的间隔时间最好为1d;对于波动较大的拱顶沉降不易采用Asaoka法进行预测,但可作为其他预测方法的参考.The embedment depth of soil in shallow buried tunnel section is shallow and distribute a lot of broken rock mass. When the tunnel construction rock formation is very easy to be disturbed lead to happen collapse, puking event. But timely grasp tunnel vault final settlement and determine the optimal supporting time can effectively avoid engineering accident. Asaoka method can use a short-term observation data to get reliable final settlement prediction value and is widely used in embankment settlement prediction. But little is used in the tunnel vault subsidence prediction. Therefore, this article relying on Shajiaping tunnel import and export section of the vault sedimentation value using Asaoka method for settlement forecast analysis. Research shows： In the use of Asaoka method for the vault subsidence prediction of time choose tunnel ex- cavation within ten days after the settlement data forecasting analysis, and vault sedimentation time interval of 1 day best; For large fluctuations of the vault sedimentation is not easy to use Asaoka method to carry on the forecast, but can be used as reference for other prediction method.

关 键 词：隧道浅埋段 拱顶沉降 ASAOKA法 

分 类 号：TU472[建筑科学—结构工程]