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Full-Text Articles in Engineering
Physical Experimental Study On Excavation Disturbance Of Tbm In Deep Composite Strata, Lin-Ken Shi, Hui Zhou, Ming Song, Jing-Jing Lu, Chuan-Qing Zhang, Xin-Jing Lu
Physical Experimental Study On Excavation Disturbance Of Tbm In Deep Composite Strata, Lin-Ken Shi, Hui Zhou, Ming Song, Jing-Jing Lu, Chuan-Qing Zhang, Xin-Jing Lu
Rock and Soil Mechanics
In view of the alternating change of soft and hard rock mass in the work face, physical model test and numerical simulation were conducted to investigate the dynamic response of tunnel surrounding rock during the process of TBM excavation in composite strata at the Lanzhou water source construction project. Similar composite rock mass materials with different strength ratios of surrounding rock were prepared by performing analogous proportion experiments. The fiber grating technology was used to capture the strain evolution law of surrounding rock in composite strata during tunnel excavation, and the macroscopic fracture morphology of the surrounding rock of the …
A Case Study Of Excavation Damage Zone Expansion Time Effect In Hard Brittle Country Rock Under High Geostress：Characteristics And Mechanism, Yan-Shuang Yang, Hui Zhou, Song-Hua Mei, Zhan-Rong Zhang, Jin-Lan Li
A Case Study Of Excavation Damage Zone Expansion Time Effect In Hard Brittle Country Rock Under High Geostress：Characteristics And Mechanism, Yan-Shuang Yang, Hui Zhou, Song-Hua Mei, Zhan-Rong Zhang, Jin-Lan Li
Rock and Soil Mechanics
The excavation damage zone (EDZ) in hard brittle country rock exhibits noticeable time effect after excavation, as rock strength varies with time caused by the high geostress, which leads to the development of surrounding rock excavation damage zone and shows time-dependent characteristics. The LSSVM-PSO intelligent inversion analysis method considering time effect was established based on the time effect evolution model of rock strength, and measured EDZ data collected in the test tunnel of Jinping Ⅱ Hydropower Station, such as borehole monitoring, ultrasonic test and deformation monitoring were used as target functions. The orthogonal design method, least square support vector machine …