EFFECT OF OUTER-WALL SHAPE VARIATION OF UNDERGROUND LINED CAVITY ON INNER-WALL DYNAMIC STRESS CONCENTRATION FACTORS PEAK VALUES
HE Ying1，2，LIANG Jianwen1，3
(1. Department of Civil Engineering，Tianjin University，Tianjin 300072，China；
2. Department of Civil Engineering，Tianjin Chengjian University，Tianjin 300384，China；
3. Tianjin Key Laboratory of Civil Engineering Structures and New Materials，Tianjin University，Tianjin 300072，China)
Abstract：A semi-analytical solution for dynamic stress concentration factors(DSCF) of underground lined cavity in half-space for incident plane SH waves is presented using wave functions expansion method combined with boundary discrete method. The cavity is with circular inner wall and arbitrary-shape outer wall of the lining. The Monte Carlo method is also used to randomly generate 30 samples of variation coefficient of 0.05 for outer-wall shape of lining，and the effect of outer-wall shape variation of lining on DSCF peak values are studied by statistical analysis. It is shown that，the outer-wall shape variation of lining has significant effect on the inner-wall DSCF peak values，with larger effect for flexible lining than stiff lining. The maxima of DSCF peak values for flexible and stiff lining are increased by 178.15% and 31.98%，respectively，compared with the case of a completely circular linings. The variation coefficients of DSCF peal values for flexible and stiff lining can be up to 9.84 and 2.57 times of those of outer-wall radius of the lining.
2015, Vol. 34 
