Prediction　of　cracking　is　greatly　important　when　evaluating　the　stability　and　safety　of　underground　engineering　projects.　In　this　paper,　3D-printed　samples　with　a　single　non-straight　fissure　are　uniaxially　compressed,　and　the　effects　of　the　inclination　angle　and　effective　curvature　on　the　cracking　are　observed.　A　simplified　approach　is　proposed　for　the　determination　of　tip　cracking　and　non-tip　cracking　of　the　non-straight　fissure.　The　accuracy　of　the　prediction　is　validated　by　the　uniaxial　tests.　The　results　show　that　the　cracking　behavior　of　non-straight　fissures　is　different　from　that　of　straight　fissures　with　respect　to　the　occurrence　of　non-tip　cracking.　Moreover,　cracking　is　significantly　influenced　by　the　geometric　parameters　of　the　non-straight　fissure.　In　addition,　the　proposed　approach　can　be　utilized　to　predict　the　cracking　of　non-straight　fissures　with　acceptable　accuracy.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.