title: Expansive soil crack depth under cumulative damage.
abstract: The crack developing depth is a key problem to slope stability of the expansive soil and its project governance and the crack appears under the roles of dry-wet cycle and gradually develops. It is believed from the analysis that, because of its own cohesion, the expansive soil will have a certain amount of deformation under pulling stress but without cracks. The soil body will crack only when the deformation exceeds the ultimate tensile strain that causes cracks. And it is also believed that, due to the combined effect of various environmental factors, particularly changes of the internal water content, the inherent basic physical properties of expansive soil are weakened, and irreversible cumulative damages are eventually formed, resulting in the development of expansive soil cracks in depth. Starting from the perspective of volumetric strain that is caused by water loss, considering the influences of water loss rate and dry-wet cycle on crack developing depth, the crack developing depth calculation model which considers the water loss rate and the cumulative damages is established. Both the proposal of water loss rate and the application of cumulative damage theory to the expansive soil crack development problems try to avoid difficulties in matrix suction measurement, which will surely play a good role in promoting and improving the research of unsaturated expansive soil.
authors.affiliation: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China ; Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China ; College of Resource, Hebei University of Engineering, Hebei University, Handan 056038, China.
authors.forename: Bei-xiao
authors.initials: BX
authors.lastname: Shi
authors.affiliation: Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China.
authors.forename: Sheng-shui
authors.initials: SS
authors.lastname: Chen
authors.affiliation: Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China.
authors.forename: Hua-qiang
authors.initials: HQ
authors.lastname: Han
authors.affiliation: Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China.
authors.forename: Cheng-feng
authors.initials: CF
authors.lastname: Zheng
mesh_terms: D019245:Compressive Strength; D003198:Computer Simulation; D004058:Diffusion; D008956:Models, Chemical; D016062:Porosity; D012987:Soil / Q000737:chemistry*; D013314:Stress, Mechanical; D014867:Water / Q000737:chemistry*
chemical_list: D012987:Soil; D014867:Water