【摘要】 海水成分复杂致使海域地层冻土力学特性及温度变化规律不同于淡水地层。基于海下隧道的修建逐渐增多且冻结法在海域环境中的应用少,开展了海域复杂环境下联络通道冻结施工温度场变化规律研究。依托国内首条海底地铁隧道——厦门轨道交通2号线,研究富集海水地层下地铁联络通道施工技术,通过对比分析了不同位置、不同深度测温孔温度分布特征,确定了"喇叭口"位置受隧道内部环境影响的范围,冻结帷幕内、外侧边缘冻结发展特点;对比深、浅测温孔数据表明泵站处冻结帷幕边缘温度沿冻结管轴向呈"W"形状分布,指出了可能存在包括两侧"喇叭口"和泵站位置中部在内的3处主要冻结薄弱区;对比分析了积极冻结期间3次不同时段、不同持续时间长度盐水温度回升对冻结加固效果的影响情况。研究成果揭示了海底隧道联络通道冻结温度场变化规律,对今后海底冻结施工具有重要的借鉴意义。更多还原

【Abstract】 The complex composition of seawater causes the mechanical properties and temperature changes of the frozen soil in the sea layer to be very different from the freshwater stratum. The construction of tunnels under sea has been gradually increasing, however only a few freezing methods were applied in the marine environment. In this paper, the variation law of temperature field in the freezing construction of the connecting aisle in the complex environment of the sea area was analyzed. Taking Xiamen rail transit line 2 as an example, which is the first subsea subway tunnel in China, the construction technology of subway connecting aisle under the enriched seawater stratum is studied, determine the range of the "horn mouth" position affected by the internal environment of the tunnel, and the characteristics of freezing development in the inner and outer edges of the frozen curtain were determined. Comparing the data of deep and shallow temperature measurement holes, the temperature of the frozen curtain edge at the pumping station is distributed in the shape of "W" along the axial direction of the freezing tube, indicating that there may be three main parts including the "horn mouth" on both sides and the middle of the pumping station. The effects of three times of salt water temperature rise on different periods of time and different lengths of time on the freezing and strengthening effect were compared and analyzed. The research results reveal the change law of freezing temperature field in the connecting aisle of the subsea tunnel, which has important reference significance for the future subsea freezing construction.更多还原