时空效应下隧道的收敛变形预测及二衬合理支护时机  

Prediction on Tunnel Circumjacent Constringency under Time-space Effects and the Reasonable Second Support Opportunity

作　　者：杨红军 夏才初[2] 彭裕闻[2] 卞跃威[2] 何坤[2] 

机构地区：[1]广东省云梧高速公路有限公司,广东云浮527300 [2]同济大学地下建筑与工程系,上海200092

出　　处：《探矿工程（岩土钻掘工程）》2010年第2期69-73,共5页Exploration Engineering:Rock & Soil Drilling and Tunneling

摘　　要：利用半解析计算方法,考虑了隧道周边收敛和拱顶下沉随时间和掌子面推进距离的变化情况,建立了相关的收敛模型,并由此给出了硬岩及软岩隧道中的二衬的合理支护时机,并结合工程实际对Ⅱ、Ⅲ、Ⅳ、Ⅴ级围岩进行了周边收敛结果的最小二乘拟合计算。同时得出了这4个级别围岩相应的合理支护时机。By the half-analytic calculation method, the paper analyzed the tunnel circumjacent constringency and vault set- tlement with time and alteration depth of tunnel face, the relevant constringeney model was built, and the reasonable second support time for hard and soft rock tunnel were proposed. With the engineering case, the least-squares fitting calculation was made on circumjacent eonstringeney of Ⅱ.Ⅲ.Ⅳ.Ⅴ grade of rocks, and the reasonable support time for these 4 grades of rock were obtained.

关 键 词：时空效应 半解析计算方法 合理支护时机 周边收敛 拱顶下沉 

分 类 号：U455[建筑科学—桥梁与隧道工程]