Table 7 Fuzzy random sensitivity of shaft circumferential reinforcement ratio.

From: Fuzzy random sensitivity analysis for the overall structure reliability of reinforced concrete freezing wellbores in deep alluvium based on hidden Markov model

Mine

Deep/m

Conventional mean sensitivity

Conventional standard deviation sensitivity

Fuzzy random mean sensitivity

Fuzzy random standard deviation sensitivity

\(\mathop {\left( {\frac{{\partial \tilde{P}_{f} }}{{\partial \tilde{\mu }_{{x_{i} }} }}} \right)}\nolimits_{\alpha }^{ - }\)

\(\mathop {\left( {\frac{{\partial \tilde{P}_{f} }}{{\partial \tilde{\mu }_{{x_{i} }} }}} \right)}\nolimits_{\alpha }^{ + }\)

\(\mathop {\left( {\frac{{\partial \tilde{P}_{f} }}{{\partial \tilde{\sigma }_{{x_{i} }} }}} \right)}\nolimits_{\alpha }^{ - }\)

\(\mathop {\left( {\frac{{\partial \tilde{P}_{f} }}{{\partial \tilde{\sigma }_{{x_{i} }} }}} \right)}\nolimits_{\alpha }^{ + }\)

Main shaft

391–430

0.0907

0.0264

0.0617

0.1245

0.0231

0.0308

430–490

0.1074

0.0227

0.0688

0.1374

0.0201

0.0268

490–545

0.1207

0.0172

0.0929

0.1422

0.0165

0.0228

400–420

0.0935

0.0277

0.0668

0.1300

0.0241

0.0322

Auxiliary shaft

420–480

0.1063

0.0224

0.0744

0.1341

0.0204

0.0266

480–544

0.1459

0.0170

0.1019

0.1605

0.0143

0.0224

400–430

0.0921

0.0286

0.0630

0.1305

0.0251

0.0331

Air shaft

430–490

0.0998

0.0231

0.0716

0.1402

0.0215

0.0279

490–538

0.1316

0.0198

0.0993

0.1619

0.0172

0.0240