Abstract：Rock and soil aggregate(RSA) is a kind of multiphase and multi-component material and its composition and internal structure characteristic is very complex. The damage process of RSA is a complex structure change process. CT tests and numerical simulation method are used to study the deformation and cracking characteristics of RSA，and it is point that cracking failure is a unique characteristic for RSA which differs from other geology bode. The primary reason cracking is the elastic mismatch between rock blocks and soil. The essence for RSA failure is a process including crack initiation，propagation，interlocking and coalescence. In this paper，some conclusions can be drawn as follows：(1) The RSA deformation features analysis based on CT tests show that the mean CT value for specimen，rock block inclusions and its adjacent soil region decease with the increase of loading，and the change is more sensitive for block inclusions. (2) The numerical simulation results show that the failure process of RSA go through with crack initiation，slow-cracking，fast cracking and coalescence. Interface between rock blocks and soil is the weakest part of RSA. The difference sliding unloading result in the crack initiation，then cracks propagate to soil along block boundary and cracks are influenced by rock blocks. The local development of crack and interlocking leading to formation of shear line with X character or wedge shape. (3) Failure of RSA is a progressive process which can be divided into three levels——rock-soil interface cracking，soil cracking and rock cracking.
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2015, Vol. 34 
