Page 8 - Analysis and Design of Energy Geostructures

viii Contents

9. Analytical modelling of transient heat transfer 409
9.1 Introduction 409
9.2 Idealisations and assumptions 410
9.3 Analysis approaches 411
9.4 Thermal resistance concept for time-dependent solutions 417
9.5 Duhamel’s theorem 419
9.6 Heat transfer around energy piles and other circular heat exchangers 422
9.7 Heat transfer around energy walls and other plane heat exchangers 431
9.8 Heat transfer at short-to-medium timescales 436
References 438
Questions and problems 441

10. Analytical modelling of capacity and deformation of single energy piles 457
10.1 Introduction 457
10.2 Idealisations and assumptions 458
10.3 Generalised axial capacity formulation 461
10.4 Capacity in coarse-grained soil 464
10.5 Capacity in fine-grained soil 473
10.6 Capacity in rock 480
10.7 Generalised axial deformation formulation 482
10.8 Thermomechanical schemes 485
10.9 Displacement charts 492
10.10 Load-transfer analysis approach 499
10.11 Modelled and observed response 514
References 531
Questions and problems 538

11. Analytical modelling of capacity and deformation of energy pile groups 567
11.1 Introduction 567
11.2 Idealisations and assumptions 568
11.3 Generalised axial capacity formulation 569
11.4 Capacity in coarse-grained soil 571
11.5 Capacity in fine-grained soil 571
11.6 Generalised axial deformation formulation 572
11.7 Interaction factor method based on charts 574
11.8 Interaction factor method based on analytical models 601
11.9 Equivalent pier method 614
11.10 Comparison with rigorous solutions 626
11.11 Modelled and observed response 644
References 662
Questions and problems 666