Undrained cyclic failure mechanisms and resistance of saturated sand-gravel mixtures
CHEN Guo-xing1, 2, SUN Tian1, 2, WANG Bing-hui1, 2, LI Xiao-jun3, 1
1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China; 2. Civil Engineering & Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China; 3. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
Abstract：There are conflicting versions of influences of different factors on cyclic resistance of sand-gravel mixtures. Considering four main factors, gravel content, effective lateral confining stress, relative density and consolidation stress ratio, a series of cyclic triaxial tests were performed on the sand-gravel mixtures with 10 groups of gravel contents. The test results and findings are summarized as follows: (1) There are two failure mechanisms of the sand-gravel mixtures under different test conditions, i.e., cyclic liquefaction and cyclic failure; (2) The excess pore pressure of a 100% and the accumulated axial strain of a 5% are adopted as the criterion for the cyclic liquefaction and the cyclic failure of the specimens, respectively; (3) An index of the sand-gravel skeleton void ratio () is employed to represent the packing condition of skeleton particles and filler particles in the sand-gravel mixtures; (4) The mean correlation representing the exponential relationship between the cyclic resistance ratio (CRR) causing cyclic liquefaction or cyclic failure at the presupposed number of cycles and the of sand-gravel mixtures is derived.
陈国兴, 孙田, 王炳辉, 李小军. 循环荷载作用下饱和砂砾土的破坏机理与动强度[J]. 岩土工程学报, 2015, 37(12): 2140-2148.
CHEN Guo-xing, SUN Tian, WANG Bing-hui, LI Xiao-jun. Undrained cyclic failure mechanisms and resistance of saturated sand-gravel mixtures. Chinese J. Geot. Eng., 2015, 37(12): 2140-2148.
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