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1 前 言 由于地质条件复杂 ,上海地区近年来在大规模开发利用地下空间的过程中遇到了许多难题 ,高孔压浅气层问题就是其中之一。浅气层中高压孔隙气的存在增加了土层的压缩性 ,降低了土层的稳定性 ,而且气体一旦释放会引起浅气层和相邻土层的剧烈扰动 ,严重威胁到地下工程
1 Introduction Due to the complex geological conditions, Shanghai has encountered many difficulties in large-scale development and utilization of underground space in recent years. The problem of high pore pressure and shallow gas layer is one of them. The presence of high-pressure pore gas in shallow gas layers increases the compressibility of the soil layer and reduces the stability of the soil layer. Once the gas is released, the severe disturbance of the shallow gas layer and adjacent soil layers will be caused, which seriously threatens the underground engineering