现场裂隙岩体水力耦合真三轴试验系统研制与应用

doi:10.13722/j.cnki.jrme.2020.0452

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Abstract In order to break through the experimental research bottleneck of hydro-mechanical coupling mechanisms of fractured rock mass reflecting the combined actions of rock mass characteristics，rock mass structure，initial stress state and stress path，a HMTS–1200 hydro-mechanical coupling true triaxial test system for fractured rock mass，consisting of high water pressure sealed test chamber system，loading and reaction system，high water pressure resistant deformation measurement system and high precision servo control system，is developed. The advantages of this apparatus are shown as follows：(1) based on the ideology of external sealed system，a high water pressure steel sealed test cabin with 1.6 m diameter is constructed to simulate the water pressure environment of fractured rock mass and the rock mass specimen and mechanical test apparatus can be placed in the chamber to carry out tests，(2) the size of fractured rock mass specimen reaches 310 mm×310 mm×620 mm and a maximum axial load of 12 000 kN and a lateral load of 3 000 kN can be applied，and (3) the rock mass deformation under high water pressures can be measured directly by deformation sensors with 3 MPa water pressure endurance，0.001 mm resolution and less than 0.05% linearity. Hydro-mechanical coupling tests under different stress states were performed. The test results show that the mechanical effect of the water pressure and the deformation response of rock mass specimens are related to the structure characteristics of rock mass，initial stress state and the path of water pressure. The water pressure acting on the specimen presents two types: an additional surface force applied on the surface of the specimen and compressing the specimen，and a seepage pressure produced by water infiltration into the fracture，reducing the effective stress of the fracture surface，and causing shear dislocation of fractures and dilating deformation of the rock specimen. The successful development of this apparatus can provide a new means for researches on complicated hydro-mechanical coupling problems and the engineering applications of rock bank deformation and induced landslides related to water impounding and operations of high dam reservoir.

Key words： rock mechanics water impounding of high dam reservoir fractured rock mass hydro-mechanical coupling in-situ true triaxial test test apparatus

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	WU Aiqing
	FAN Lei
	ZHONG Zuowu
	ZHANG Yihu
	YU Meiwan

Cite this article:

WU Aiqing,FAN Lei,ZHONG Zuowu, et al. Development of an in situ hydro-mechanical coupling true triaxial test system for fractured rock mass and its application[J]. , 2020, 39(11): 2161-2171.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0452 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I11/2161

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