【作者】 杨林德； 闫小波； 李燕； 张向霞； 刘成学；

【Author】 Yang Linde Yan Xiaobo Li Yan Zhang Xiangxia Liu Chengxue (Department of Geotechnical Engineering, Tongji University, Shanghai 200092 China)

【机构】 同济大学地下建筑与工程系；

【摘要】 在软弱岩层中建设隧道和地下工程时,地层材料的性态特征对围岩的稳定性常是关键影响因素之一,而在存在渗流耦合作用的情况下,其重要性显得更加突出。与相同围压、干躁状态下的试验结果相比,在室内模拟渗流耦合条件下,泥质粉砂岩的峰值应力下降了70％,峰值应变下降了50％;褐红色泥岩的峰值应力下降了85％,而峰值应变变化不明显。渗透系数的计算结果表明,在全应力-应变过程中,泥质粉砂岩的渗透系数先减小再增大,而褐红色泥岩的渗透系数一直在减小。泥质粉砂岩在平行于层理方向的峰值应变大于垂直方向,而垂直于层理方向的渗透系数大于平行方向;褐红色泥岩在各个方向的力学特征及渗透性均无明显差别。更多还原

【Abstract】 For the stability analysis of tunnels and underground structures in weak rock, the behavior of stratum materials is usually one of the key influence factors, especially in the situation that the surrounding rock of them is under coupled permeability action. Compared with the dry samples under the same confining pressure, under seepage-coupling condition, the peak stress of clayey siltstone decreases 70% and the peak strain decreases 50%; the peak stress of brown mudstone decreases 85%, but the peak strain doesn’t change obviously. The results also show that in the whole stress-strain progress the permeability of clayey siltstone decreases at the first stage but increases later and the permeability of brown mudstone decreases with the strain in the whole progress. The peak strain of clayey siltstone parallel to the bedding face is larger than vertical to the bedding face, but the permeability of clayey siltstone vertical to the bedding face is larger than parallel to the bedding face. In both of the direction, the mechanical characters and the permeability of brown mudstone are almost equal.更多还原