盾构进出洞全方位风险控制冻结加固技术

在含水复杂的地质条件下采用水平冻结法进行盾构进出洞施工，可以通过延长（加深）水平冻结外圈冻结深度，使冻结加固体全方位包裹并超过盾构机本体，利用外圈冻结孔的维护冻结，将盾构推进过程中形成的微小流水通道中的泥土冻结成为冻土，封闭流水通道，较为有效地防止了流水、涌砂现象的发生。利用长距离水平钻孔防喷接驳器，简单方便地解决了在已施工完毕的端头井内长距离钻孔的难题。工程实践证明，全方位风险控制冻结加固技术在复杂地质条件下盾构进出洞施工中，简单易行，安全可靠，值得推广应用。

Technology of freezing reinforcement and risk control at all direction in construction of break in and break out of shield

The construction of break in and break out of shield in the complicated condition of aquiferous geology, by the method of horizontal freezing, is to extend or deepen the frozen thickness outside the horizontal freezing ring which encircle the shield at all directions and prevent from water leaking and sand pouring effectively. The problem of long distance drilling in the finished end well is solved easily by a long distance horizontal drilling and anti extrusion connector. It has proved that the technology of freezing reinforcement and risk control at all direction, in the construction of break in and break out of shield in the complicated condition of aquiferous geology is reliable, easy and will have great value to be spread in the risk control of construction of break in and break out.