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Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials

Erich BAUER, Zhongzhi FU, Sihong LIU,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 1,   Pages 78-91 doi: 10.1007/s11709-010-0011-8

Abstract: The wetting deformation of weathered rockfill materials has been attracting growing attention from both

Keywords: rockfill dams     weathered granular materials     hypoplasticity     solid hardness     creep     stress relaxation    

Structural design and mechanical responses of closely spaced super-span double tunnels in strongly weathered

Jiaxin HE; Shaohui HE; Xiabing LIU; Jinlei ZHENG

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 6,   Pages 685-703 doi: 10.1007/s11709-022-0824-2

Abstract: This paper presents a study of closely spaced double tunnels in Taizhou, China. One is Xiabei Mountain No. 2 four-line super-span high-speed railway tunnel (HRT), and the other is Xiabei Mountain double-line large-span subway tunnel (ST). The excavation spans of HRT and ST are 26.3 and 14 m, respectively. The two tunnels are located at different levels, and their separating distance is 17.2 m. Due to the short construction period, the HRT excavation was completed earlier than ST. The structural design of the HRT, taking account of the disturbance by the ST construction, was analyzed by a numerical simulation. It was found that the “yielding principle” design was more feasible than the “resistance principle” design when considering the safety and durability of the HRT secondary lining. The mechanical responses of the HRT during ST construction were comprehensively monitored and analyzed, including the vault settlement, horizontal convergence, surrounding rock pressure, and the internal stress in shotcrete and steel arch. Results show that the longitudinal influence range of the ST construction on the HRT was approximately 0.6–1.1 times the ST outer diameter; the disturbance was mainly generated in the ST upper bench excavation; and the final axial force of the HRT shotcrete was approximately 9–16 times that of the steel arch, which indicated that the shotcrete was the main bearing structure. The safety status of the HRT was assessed based on the monitoring data, and the minimum safety factors of the HRT shotcrete and steel arch were 1.61 and 1.89, respectively. Parametric studies were performed to show how the lining stress of HRT was affected by the relative angle, pillar width, ST excavation method and excavation footage. Finally, the design and construction optimization were proposed according to the monitoring data and parameter analysis results. This study might provide practical reference for similar projects.

Keywords: double tunnels     super-span     structural design     mechanical response     numerical simulation     field monitoring    

Adaptability to geological faulted foundation of Hardfill dam

XIONG Kun, HE Yunlong, PENG Yunfeng

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4,   Pages 343-349 doi: 10.1007/s11709-008-0057-z

Abstract: dam body and anti-sliding stabilization is analyzed on the geological faulted foundations with weak weathered

Keywords: weathered     elastic     geological faulted     FEM     gravity    

Treatment of Highly Weathered Rock Mass at the Abutment of Earth-Rock Dam in Qiaoqi Hydropower Project

Wang Shougen

Strategic Study of CAE 2005, Volume 7, Issue 3,   Pages 78-83

Abstract: Design Specifications for Rolled Earth-Rock Fill Dams (SL274-2001) require excavating into the slightly weathered

Keywords: Qiaoqi Hydropower Station     earth-rock dam     treatment of abutment     highly weathered rock mass     consolidation    

The impact on expensive soil characteristics with different dosages of weathered sand of a highway in

Yang Jun,Li Xinchun,Zhang Guodong,Tang Yunwei,Xie Zhigang,Guo Daoyi

Strategic Study of CAE 2012, Volume 14, Issue 11,   Pages 57-62

Abstract: Xiaoxita to Yaqueling first-class highway rebuilding engineering in Yichang City of Hubei Province and weatheredThrough the test of undisturbed expansive soil mixed with different content of weathered sand, it wasfound that undisturbed expansive soil mixed with weathered sand can change the expansive soil waterUndisturbed expansive soil mixed with different content of weathered sand can influence the expansibility

Keywords: xpansive soil     weathered sand     expansion indicator     compaction test    

Experimental research on the mixed sand ratio and initial dry density of weathered sand improved expansive

Yang Jun,Yang Zhi,Zhang Guodong,Tang Yunwei and Chen Hongping

Strategic Study of CAE 2014, Volume 16, Issue 2,   Pages 73-78

Abstract: ,slow expansion and eventually stabilize in three stages;during the initial dry density is constant,weatheredrate will increase the proportion of sand mixed with the rapid decrease slowly after the first lower,weatheredfree load swelling rate is not sensitive to the amount of sand mixed;in the same mixed sand ratio, weathered

Keywords: expansive soils     weathered sand     initial dry density     mixing sand ratio     free load swelling rate    

Study on the grouting technology adopted in F1 weathered trough for Xiamen Xiang’an Subsea Tunnel

Guo Xiaohong,Wang Mengshu

Strategic Study of CAE 2011, Volume 13, Issue 9,   Pages 38-41

Abstract:

Focusing on F1 weathered trough which has maximum water inflow and great

Keywords: Ximen Xiang’an Subsea Tunnel     grouting reinforcement     stability     numerical simulation    

Experimental investigation on strength of sandstone weathered and absorbed water heavily and its constitutive

Zou Chong,Lei Shengyou,Yue Xijun,Song Yan,Gao Pan

Strategic Study of CAE 2011, Volume 13, Issue 1,   Pages 74-80

Abstract:

According to the feature of sandstone weathered and absorbed water heavily

Keywords: sandstone     water content     strength     disturbed by blasting     bedding     constitutive law    

Title Author Date Type Operation

Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials

Erich BAUER, Zhongzhi FU, Sihong LIU,

Journal Article

Structural design and mechanical responses of closely spaced super-span double tunnels in strongly weathered

Jiaxin HE; Shaohui HE; Xiabing LIU; Jinlei ZHENG

Journal Article

Adaptability to geological faulted foundation of Hardfill dam

XIONG Kun, HE Yunlong, PENG Yunfeng

Journal Article

Treatment of Highly Weathered Rock Mass at the Abutment of Earth-Rock Dam in Qiaoqi Hydropower Project

Wang Shougen

Journal Article

The impact on expensive soil characteristics with different dosages of weathered sand of a highway in

Yang Jun,Li Xinchun,Zhang Guodong,Tang Yunwei,Xie Zhigang,Guo Daoyi

Journal Article

Experimental research on the mixed sand ratio and initial dry density of weathered sand improved expansive

Yang Jun,Yang Zhi,Zhang Guodong,Tang Yunwei and Chen Hongping

Journal Article

Study on the grouting technology adopted in F1 weathered trough for Xiamen Xiang’an Subsea Tunnel

Guo Xiaohong,Wang Mengshu

Journal Article

Experimental investigation on strength of sandstone weathered and absorbed water heavily and its constitutive

Zou Chong,Lei Shengyou,Yue Xijun,Song Yan,Gao Pan

Journal Article