Experimental Study On Indoor Uniaxial Frost-heaving Constitutive Relation And Frost-heaving Force Of Tunnel In Frozen Earth Region

With vigorous development of domestic economic construction and more fulfillment of the policy of development in west, the requirement to basic transportation establishment added continuously, especially means of consummating traffic network, it was required that basic traffic establishment extended to high latitude or high altitude cold region which environment condition was wicked, and that these area were mostly high mountain, therefore the construction of mass frozen earth tunnel was inevitable. A lot of practice of contraction and transport service of railway and highway tunnel overseas and interiorly proved that freeze injure always happened in tunnel when ground water growed in high latitude or high altitude cold regions. Freeze injure endangered the safety of tunnel structure and transport service directly and caused serious economic loss. Prevenient research has already proved that frost-heaving force was the leading cause of causing tunnel freeze injures. Therefore, it has prominent theoretic and engineering experience application value to discuss frost-heaving constitutive relation of rock sample and research frost-heaving force distribution regulation back of tunnel's lining by indoor experiment in this thesis.In this thesis, indoor experiment has two parts. Firstly is indoor uniaxial frost-heaving constitutive experiment, the principle of constitutive experiment is expounded particularly as well as experimental design , rock sample-preparing, testing course and data conclusion of the experiment. The test results show us rock sample's uniaxial frost-heaving σ—ε constitutive characteristic curve and changing relation between frost-heaving force and deformation when rock sample freezes swell, as well as rock sample's frost-heaving intensity, frost-heaving elastic modulus of predigestion algorithmic is educed by means of predigesting frost-heaving characteristic curve of rock sample.The second part of indoor experiment is frost-heaving force model test, similarity theory, the establishment of similarity criterion and the design scheme of model test are expatiated particularly in the thesis. Distribution characteristics and quantity value of frost-heaving force between tunnel's lining and surrounding rockand structural internal force caused by frost-heave force including lining types of bending walK straight wall and rotundity and considering influencing factors consist of constraint conditions > thermal insulation material and containing water status are analysed by experimental results.