Permafrost
Permafrost
Permafrost
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72<br />
Analytically study on the rising temperature of freezing soil zone<br />
Compared to FEM<br />
Xiao-min Zhou 1 , Hong-zhen Liang 2 , Yong-fu Guo 2<br />
(1.Civil and environmental school,USTB, 2.Ground Freezing Department of First China Coal construction<br />
Group)<br />
Abstract: Using graphical chart tool of Maple and the analytics theory, this paper studied the<br />
procedure of transit rising temperature fields of the infinite long column and infinite plain wall<br />
of frozen soil. Compared with the results of FEM, the analytics answer is much consistent with<br />
the numerical, this reveal that when stopping freezing, the rising temperature field characterized<br />
evidently, which can be surveyed in the center of freeze hole and usefully applied to supervising<br />
the ground freezing process.<br />
Keyword: freezing wall, analytics analysis, and frozen soil structure.<br />
Experimental and mechanical study on the Coupled action to seepage<br />
field applied by both stress and temperature fields<br />
Xiao-min Zhou 1 , Long-ge Xiao 2 , Yun-chen Zhao 2<br />
(1.Civil and environmental school,USTB. 2.Wuhan Command Center of Yangzi river tunnel China Railway<br />
Tunnel Corporation)<br />
Abstract: This paper firstly summarized the coupled field theory of temperature and stress<br />
applied to the seepage field, and then studied the function of parameter of permeability<br />
coefficient, so argued the monotonically changes with the varies of temperature. Experiment<br />
has been set and carried out, and the result data were regressed in the form of exponential<br />
function, in which the convergence of nonlinear numeral calculation surely is benefit.<br />
Research on mode and criterion of frozen soil fracture under<br />
compressive loading<br />
Xiao-zhou Liu, Hong-sheng Li, Yue-dong Wang<br />
(Dalian University of Technology, Engineering Mechanics Department, Dalian, Liaoning,P.R.China, 116023,<br />
China Correspondence should be addressed to Liu Xiaozhou(E-mail:lxzxmy0125@163.com)<br />
Abstract In order to explain the mode l and ll of frozen soil fracture under compressive loading,<br />
a stress model of micro-cracking element is presented on the basis of damage properties in the<br />
tip of main crack.. Through studying the distribution law of stress intensity factors of branching<br />
cracks in various orientation, a new criterion of fracture mode and failure of mixed crack of<br />
frozen soil subjected to compressive loading, expressed by rations of stress intensity factors and<br />
fracture toughness, is obtained, which can predict not only mode l, but also mode ll of fracture.<br />
Based on it, the geometrical and loading conditions of mode ll of fracture are given and<br />
discussed in detail. The results are in good consistent with experiments.<br />
Key words: compressive loading, frozen soil crack, fracture mode, fracture criterion
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