1Introduction1
1.1Classification of Mining Roadways1
1.2Application of GER5
Relief5
1.3Failure Modes of Roadways7
References8
2Overview of Engineering Geology11
2.1Overview11
2.2CoalBearing Strata11
2.3Distribution of GeologicalConditions15
2.4Chapter Summary20
References20
3Adaptation Assessment of GobSide EntryRetaining22
3.1Introduction22
3.2Determination of Impact Factors23
3.3Field Application Statistics26
3.4Indicator Weighting30
3.5Adaptive Grades and Their SupportMethods33
3.6Adaptability Evaluation Process37
3.7Chapter Summary41
References41
4Advancing Cutting Roof for RetainingGateway With Near Horizontal
and Close Coal Seam Groups44
4.1Introduction44
4.2Mechanism of the Cutting Roof for aRetaining Gateway45
4.3Equivalent Material SimulationExperiment46
4.4Result of the Experiment50
4.5Discussion59
4.6Chapter Summary60
References61
5Natural Filling and Systematic RoofControl Technology for
Retaining Gateway in Steep Coal Seams64
5.1Introduction64
5.2Investigation of Steep Coal Seams65
5.3Analysis of the Advantage of the Useof GER in Steep Coal
Seams66
5.4The Key Technology for GER71
5.5Gateway Driving and Its SupportTechnology77
5.6Chapter Summary81
References81
6Soft Roof Failure Mechanism andSupporting Method for Retaining
Gateway84
6.1Introduction84
6.2Description of Field Observation85
6.3Stress Evolution Law in Roof88
6.4Force States of Roof Rock Mass90
6.5Mechanism for Failure of Roof RockMass91
Roadway95
6.6Roof Support Countermeasures96
6.7Discussion102
6.8Chapter Summary103
References104
7The Failure Characteristics and theSupporting Technology for
PreRetaining Gateway106
7.1Introduction106
7.2Understanding of Surrounding RockFailure and Its Support107
7.3Investigation of Test Field111
7.4Test of Gateways Broken Width113
7.5CrossSection Diagram of ExcavationBroken Zone (EBZ)118
7.6Broken Width in Gateways withDifferent Excavation Method123
7.7Experimental Studies on the ImprovedMaterial Parameters
of Bolts125
7.8Support Effect Analyses of Bolt andSurround Rock131
7.9Supporting Technology137
7.10Chapter Summary138
References140
AttachmentEvaluation Results ofAdaptability of Gobside Entry
Retaining144
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