In order to establish the three-dimensional stability analysis method of complex gentle incline rock slope,the gentle incline rock slope which includes stratum and multi-group structural plane was taken as the research object. Firstly, according to the survey data of field, the contact relationship of adjacent rock blocks of gentle incline rock slope was divided into detachment, surface contact and line contact. According to the contact method of each rock, the corresponding contact mechanics mode was constructed, and the load-bearing condition of the rock was also defined. Based on the material mechanics, the calculation method of interlayer load in three kinds of contact cases was established by regarding vertical displacement and the corner of rock as intermediate variables. Then, according to the load of each rock, the tensile stress, shear stress and torque at the rear structural plane of rock were calculated. The first, second and third type of stress intensity factors of the structural plane were obtained based on the fracture mechanics method, and further, the calculated expressions of the combined stress intensity factors of the structural plane were obtained. Finally, the ratio of the fracture toughness of the structural plane to the joint stress intensity factors was used as the stability coefficient of each rock. By comparing the relationship of size between the stability factor of the rock and 1, whether the blocks are stable could be judged. The method of this paper was applied to gentle incline rock slope of Yangcha River in Qijiang。The results show that the location of the top-slope failure calculated by the calculation method in this paper is basically consistent with the location where the on-site slope has been cracked, which means that the three dimension stability analysis method of complex gentle incline rock slope is reasonable. Therefore, the method constructed in this paper can provide primary theoretical support for the prevention and control of the gentle incline rock slope.
Key words
road engineering /
stability analysis /
fracture mechanics /
gentle incline rock mass slope /
multi-group structural plane
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