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Deformation mechanism of rock mass and prestressed anchor cable support technology of Haidong soft rock tunnel

Journal of Mountain Science 2024年第12期21卷 4299-4322页

作者： LEI Xiaotian TAO Zhigang LIU Keyuan YANG Hong CAI Mingjiu FAN Xiaowei State Key Laboratory for Tunnel Engineering Beijing 100083China School of Mechanics and Civil Engineering China University of Mining&TechnologyBeijing 100083China China Railway 20th Bureau Group Co. Ltd.Xi’an 710016China China Railway 5th Bureau Fifth Company Chenzhou 423000China School of Energy and Environment Zhongyuan University of TechnologyZhengzhou 450007China

The Haidong Tunnel is one of the four soft rock tunnels of the Central Yunnan Water Diversion Project(CYWDP),where large deformation hazards of soft rock occur frequently,which seriously affect construction *** effect of highly prestressed anchor cable support was studied based on the active support test in the No.3 branch tunnel of Haidong ***,the geological conditions and failure causes were analyzed on the basis of the results of geological survey,in-situ test,and rock laboratory ***,the Mohr circle form of the highly prestressed anchor cable active support theory for the support of bedded rock mass was given in combination with the excavation compensation *** is considered that the prestress active compensation value required for the bedded rock mass is larger than that for the homogeneous rock *** deformations of rock mass under both passive and active supports were analyzed by numerical ***,the'pressure bubble'mechanical model for anchor cable support of bedded rock mass in Haidong Tunnel is *** monitoring results show that the highly prestressed anchor cable support can control rock mass deformation well,with a maximum deformation of about 200 *** prestressed anchor cable is effective in the bedded stratum,which makes the stress of rock mass uniform and reduces the risk of failure of steel arches due to local ***,the expansion of plastic zone was efficiently controlled,which is of positive significance for the overall stability of rock mass.

关键词： Central Yunnan Water Diversion Project Large deformation of soft rock Prestressed anchor cable active support 'Pressure bubble'mechanical model

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A New Monodisperse Reactive Resin with active Groups on the Particle Surface

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Chinese Chemical Letters 2001年第1期12卷 71-72页

作者： Yu Han GUO Tian Sheng SU Center for Molecule Science Institute of ChemistryThe Chinese Academy of SciencesBeijing 100080

A novel reactive resin as active support was synthesized by an improved method based on seed swelling and surface coating polymerization. The resin is monosized beads with inner nucleus of cross-linked polymer and sur... 详细信息

关键词： Monosized polymer beads reactive resin active support

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Design and Research of active Gravity Unloading Device for Large Aperture Optical Mirror

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Optics and Photonics Journal 2023年第7期13卷 167-177页

作者： Qiuyue Yu Zhaoming Wang Qiushi Yang Wen Guo Chunlin Li Yonggang Wang Mengjuan Li Jianhua Zhang Chao Wang Beijing Institute of Space Mechanics & Electricity Beijing China

The large aperture optical mirror for space is processed and tested in the gravity environment on the ground. After entering space, gravity disappears due to the change of environment, and the mirror surface that has met the engineering requirements on the ground will change, seriously affecting the imaging quality. In order to eliminate the influence of gravity and to ensure the consistency of space and ground, gravity unloading must be performed. In order to meet the requirements of processing and testing for the large aperture space mirror in the state of vertical optical axis, a universal gravity unloading device was proposed. It was an active support and used air cylinders to provide accurate unloading force. First, the design flow of gravity unloading was introduced;then the detailed design of the mechanical structure and control system was given;then the performance parameters of the two types of cylinders were tested and compared, including the force-pressure relationship curve and the force-position relationship curve;finally, the experimental verification of the gravity unloading device was carried out;for a mirror with an aperture of ?2100 mm, the gravity unloading device was designed and a vertical detection optical path was built. The test results showed that by using this gravity unloading device, the actual processing surface accuracy of the mirror was better than 1/50λ-RMS, which met the application requirement of the optical system. Thus, it can be seen that using this gravity unloading device can effectively unload the gravity of the mirror and realize the accurate processing and measurement of the mirror surface. .

关键词： Optical Mirror Large Aperture active support Gravity Unloading

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