冻结白垩系砂岩强度特性试验研究

doi:10.11799/ce201512025

摘要/Abstract

摘要： 为研究白垩系地层冻结砂岩的强度特性，采用MTS-815电液伺服岩石试验系统开展了不同温度状态下饱和中砂岩和粗砂岩的单轴压缩试验，获得冻结白垩系砂岩的力学性质与低温的相关性。试验表明：冻结白垩系中粒砂岩及粗粒砂岩，其单轴抗压强度均随温度的降低而增大，从25℃降至-30℃的过程，中粒砂岩强度提高了49.475%～64.656%，而粗粒砂岩的强度提高了59.455%～84.886%，相同温度下，饱和粗粒砂岩的单轴强度总是大于中粒砂岩；两种岩石强度的差异性较大，且差值随着温度降低而总体上不断增大；随着温度的降低冻结白垩系岩石弹性模量明显增大，应力-应变曲线的压密段和塑性变形段越来越不明显，表现出更明显的弹性和脆性特征。通过试验结果分析，可为该地区冻结法凿井冻结壁和井壁的设计参数的选取提供参考。

关键词: 白垩系, 砂岩, 强度, 冻结壁, 井壁设计

中图分类号:

TD265.3

田应国，杨更社，李博融，等. 冻结白垩系砂岩强度特性试验研究[J]. 煤炭工程, 2015, 47(12): 78-81.

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http://www.coale.com.cn/CN/Y2015/V47/I12/78

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