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压密注浆, 孔隙水压力, 固结, 注浆压力

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RESEARCH ON BEARING BEHAVIOUR OF P ILE
IN CALCAREOUS SO IL OF CORAL REEF

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M ESO-M ECHANISM OF DAMAGE AND FRACTURE ON ROCK
BLASTING AND ITSM ECHANICAL BEHAVIORS

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RESEARCH ON THREE D IM ENSIONAL
D ISCONTINUOUS DEFORMATION ANALYSISM ETHOD

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STUDY ON GEOLOGICAL ENGINEERING PROBLEM OF SLOPE

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T IM E- DEPENDEN T BEHAV IOR O F ROCK SAL T
EXPER IM EN TAL INV EST IGA T ION AND
THEORET ICAL ANAL YS IS

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2000, 19 (05): 687-687 doi:
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博士学位论文摘要　The rheo logical behavio r of rock salt is impo rtant fo r many engineering app licat ions1Th is
dissertat ion repo rt s on experiment s and model analyses of rock salt1 A n in- dep th study is p resented of the
t ime - dependent p ropert ies of rock salt1 It consist s of two part s1 The f irst part is the experimental
invest igat ion, w h ich is aimed at imp roving the understanding of the rheo logical behavio r of rock salt1U niaxial
and t rtaxial creep and relaxat ion experiment s have been perfo rmed to further th is goal1 The second part is the
analysis of const itut ive models of the mechanical behavio r of rock salt and the evaluat ion of their p redict ive
capability1 The object ive of th is research is to upgrade the understanding of the t ime- dependent p ropert ies of
rock salt and to develop a mo re reasonable damage const itut ive theo ry to describe the comp lete mechanical
response of rock salt1
In the f irst part , besides convent ional creep and relaxat ion test s , stepw ise , loadins and reloading , and
alternat ing relaxat ion and creep test s are described1 Tw elve test s have been perfo rmed, rangig in durat ion
f rom a few hours to 4 month s1 The axial st ress ranges f rom 13 to 43M Pa1 Conf ining p ressure ranges f rom 0
to 111 2M Pa1The conf inins p ressure effect , the st ress level , and the load path effect on the creep and st ress
relaxat ion of rock salt are analyzed th rough the experimental invest igat ion1 The p re - creep effect on st ress
relaxat ion is obtained1 The experimental invest igat ions reveal that the conf ining p ressure effect on the creep is
signif icant only in the low - p ressure range (0～ 3M Pa) 1 Steady state st rain rate is independent of the load
path1 The p re- creep st rain and the conf ining p ressure affect the st ress relaxat ion signif icant ly1 The existence
of a t ransient st rain lim it and of a low er creep lim it is conf irmed by the experimental result s p resented in th is
dissertat ion1
The second part of th is study review s const itut ive theo ry equat ions current ly used in rock salt mechanics
research and suggest s a new const itut ive equat ion in o rder to rep resent the test ing data obtained1 A n
endoch ronic model is developed in o rder to model the temperature effect s on the material response1 A new
damage const itut ive equat ion is p ropo sed in o rder to rep resent the ent ire creep behavio r1 A comparison of
theo ret icaliy calculated result sw ith experimental result s is given1Based on thermodynam ic theo ry and damage
mechanics , an evo lut ion equat ion of creep damage of rock salt is p ropo sed1A new creep const itut ive equat ion
is derived f rom th is evo lut ion equat ion1 The new model p redict s the damage behavio r induced by the creep
usins only a few material parameters , w h ich have obvious physical meaning1