(1. College of Civil Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China)
The roof box jacking (RBJ) method is very suitable for the construction of the underpass because of its micro-disturbance. The non-similar model experiment of the gravity field in sand layers is carried out to explore the role of the pipe roof in enhancing the stability of the excavation face and restricting the environmental disturbance. The instability process of the excavation face is simulated by controlling the displacement of the excavation face. Advanced monitoring technologies including piezoelectric film，DIC binocular camera and distributed fiber optic are adopted to respectively monitor three-dimensional earth pressure distributions of the excavation face，three-dimensional ground displacements and deformation of the pipe roof. The influence of the excavation face displacement on the load size and distribution of the excavation face，the size and distribution of the ground settlement and the deformation of the pipe roof is discussed，and the stability mechanism of the excavation face under the effect of the pipe roof is analyzed. It is found that the pipe roof can prevent the sliding surface from extending to the ground surface and the soil above the sliding block from collapsing. Simultaneously，the pipe roof bears part of the overburden pressure together with the soil arch，effectively reduces the load on the excavation face and significantly restricts the environmental disturbance. The conclusions of the study have guiding significance for the development of the roof box jacking method.
谢雄耀1，2，赵铭睿1，2，周 彪1，2，姜春钊1，2. 管幕作用下矩形大断面开挖面稳定模型试验研究[J]. 岩石力学与工程学报, 2019, 38(11): 2299-2310.
XIE Xiongyao1，2，ZHAO Mingrui1，2，ZHOU Biao1，2，JIANG Chunzhao1，2. Model experiment study on stability mechanisms of large rectangular excavation faces under the effect of pipe roof. , 2019, 38(11): 2299-2310.
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2019, Vol. 38 
