Abstract: Broken surrounding rock, complex grouting ways and obvious rheology are widespread in the deep gateway. Exploring cementation mode and creep control model of broken rock body in deep gateway is beneficial to surrounding rock stability. Specimens of marble and gritstone were obtained by four steps: sampling, splitting, creep, and cementation. Creep tests of cementation reinforcement on two groups of marble specimens and gritstone ones were carried out by means of an RLW-2000 triaxial rheological system. Basic creep characteristics of splitting damaged cementation rock were analyzed. A basic cementation mode of split rock was determined. A basic creep constitutive model of split cementation rock was deduced, and the inversion analysis was carried out. The results show that as creep stress level increases continuously, creep strain of the marble will undergo a process including a slow increase stage, a rapid increase stage, and an abrupt increase stage, creep strain of the gritstone will undergo a process including a decrease stage, a stable stage, and an increase stage, and the fractures in all the specimens will be compacted continuously, extended, interconnected and failed, which results in failure, that there are two modes of rock cementation: the tight cementation and the thickness one, the tight cementation is better than thickness one, that the thicker the cementation is in thickness cementation specimen, the higher the strength of the cementation specimen will be, while the increasing trend will be damped, that the M-K-B constitutive model can reflect the basic creep characteristics of cementation rock, and that when cementation coefficient increases, the creep strain of cementation rock decreases, while the decreasing rate tends to decrease under the same creep stress level.

Key words: splitting rocks, cementation thickness, creep characteristics, cementation mode, cementation coefficient