深厚冲积层立井井壁冻结压力的模糊随机分析

Fuzzy random analysis of vertical shaft freezing pressure in deep alluvium

对口孜东矿井壁冻结压力进行现场监测,发现冻结工程中井筒所承受的压力具有随机性,总体趋势分为加速上升期、平缓上升期和平稳期。同时,受冻结管偏斜、盐水流量不均、土性差异和环境变化等因素影响,井壁冻结压力又具有明显的模糊性。为兼顾随机性和模糊性,采用模糊随机方法对井壁冻结压力不确定性进行分析。通过公式推导和数据拟合,分别在黏土层和钙质黏土层建立井壁冻结压力的模糊随机表达式,最后通过朱集西矿进行验证。结果表明:模糊随机分析值与现场实测值基本吻合,为今后深井施工安全提供了可靠保障。

The field monitoring on the vertical shaft freezing pressure in Kouzidong mine shows that the freezing pressure has random feature,changing from accelerating rise,gentle slope to stationary phase. Under the influence of frozen pipe skewness,brine flow unevenly, geotechnical properties and environmental change, the freezing pressure has fuzzy characteristics simultaneously. For both considerations of them, uncertainty analysis on shaft freezing pressure is conducted with fuzzy random method. Distinguishing between clay and calcareous clay,fuzzy random formulas of vertical shaft freezing pressure have been built through the formulas derivation and data fitting. At last,an engineering example in Zhujixi mine is given for verifying the degree of fitting between fuzzy random analysis value and measured value. The results fit well,thus providing a reliable guarantee for shaft safety in future.