摘要
近邻桩基施工会对盾构隧道产生较大的不利影响,试桩过程中对试桩周围土体深层水平位移、隧道结构竖向位移和沉降进行了现场监测。监测结果表明,隧道结构竖向位移和水平位移缓慢增加,对桩体周边土体产生扰动;管片位移最大值发生在与试桩相对应的剖面上;随着试桩距离的增加,管片沉降和最大水平位移减小。管片以发生水平位移为主,沉降约为水平位移的0.5倍。在隧道埋深范围内,深层土体水平位移向隧道方向移动;隧道埋深范围以下,土层的水平位移向远离隧道方向移动。试桩实践表明,采用全套管钢套管护壁旋挖取土工艺,并在施工过程中对盾构隧道和周围土体进行动态信息化监测的施工方法能较好地预警、控制施工风险,得到的结论可以为相似工程的施工提供指导和参考。
Pile foundation construction may have passive effects on the adjacent tunnel; and it makes the settlement and horizontal displacement of the tunnel increase slowly and makes the surrounding soil disturbance. The field measurements are carried out. The results show that the settlements and horizontal displacements of tunnel increase slowly; the pile surrounding soils are disturbed. The correspondent cross section has the maximum segment displacement. The settlement and horizontal displacement of the segments decrease with distance between the piles and the tunnel. The settlements are probably 0.5 times of horizontal displacement-based segments. Soil horizontal displacement moves to direction of the tunnel in one burial depth of the tunnel, while moves to the other direction beyond the burial depth. The test of pile practice shows that it is possible that soils can be cutting by all the steel casing pipe wall spiral; and it has better early warning and controlling construction risk for information monitoring of tunnel and surrounding soil layers during construction. The conclusions can provide the guidance of similar projects and for references.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2015年第S2期577-582,共6页
Rock and Soil Mechanics
关键词
近邻桩基
监测
盾构
管片
adjacent pile foundation
monitoring
shield construction
segment
