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Liu Y.,University of Jinan | Liu Y.,Center for Monitoring Research | Liu J.-Y.,University of Jinan | Liu J.-Y.,Center for Monitoring Research | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2016

Through the indoor model test, using the visual tracking technology, through observing the soil displacement field of anchor in the drawing process, and the soil particle porosity and particle trajectory tracking, and then the mechanism of anchor and soil nail is studied. The study found that the particles in the process of pulling anchor for the shear effect of the soil particles move to the soil nailing mobile, but because the boundary constraint of soil nail, the particles reverse, the final compaction zone is formed between the anchor and the soil nailing; the formation of compaction zone not only decreases the soil displacement, but also make the limit of soil nailing, and anchor pullout capacity is improved, which explains why the anchor composite soil nailing can decrease the soil displacement. The study results can provide a theoretical basis for the design of and construction of the anchor composite soil nailing. © 2016, Science Press. All right reserved. Source

Han K.,Northwest Research Institute Co. of C.R.E.C | Ma H.-M.,China Academy of Railway Sciences | Si X.-D.,Shandong Zhengyuan Construction Engineering Co.
Journal of Railway Engineering Society | Year: 2016

Research purposes: A large number of mountainous highways under constuction and that is already built involve cutting slope engineering problems. Through monitoring of deep horizontal displacement and surface displacement, the exact position of the slide surface was found, analyzing the whole deformation process scattered on the body and turn into landslide without retaining after slope excavation, to provide a basis for emergency design of landslide. Through analyzing the amount of deformation observation data of scattered insequent landslide, the landslide displacement characteristics before and after rock reinforcement were obtained. Research conclusions:(1) The deformation characteristics of the scattered insequent landslide are scattered in front, slip in after, the landslides are generally converted by scattered together. Landslide attaches scattered body and the slide zone part attaches to scattered zone. (2) Through monitoring data, the exact position of the slide surface was found, the whole displacement development and changes of scattered landslide were monitored and truly described. (3) The landslide retaining arrangement prestressed anchor can take the initiative to protect the slope and play a significant reinforcing effect to broken rock and landslide deformation. (4) The research result can provide a basis to landslide emergency design and win the time for the landslide protection, and provide reference and empirical criteria for the construction and design of this kind of slope. © 2016, Editorial Department of Journal of Railway Engineering Society. All right reserved. Source

Xiang W.,Shandong University | Zhang Q.-Y.,Shandong University | Zhang J.-G.,Shandong Zhengyuan Construction Engineering Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

The creep parameters of rockmass are essential data of geotechnical engineering design. To accurately determine the creep mechanical parameters of rockmass, considering the advantages of the analytical inversion method and intelligent inversion method, the analytical intelligence inversion method coupling the analytical inversion and the intelligent inversion is developed. The proposed method is applied to the Dagangshan hydropower station project to obtain the compressive creep parameters of rockmass in dam zone. The results show that analytical intelligence inversion creep curves are more coincident with experimental creep curves than the analytical inversion creep curves, proving that the creep parameters obtained through the analytical intelligence inversion method to be more accurate and reliable, and hence the validity and rationality of this inversion method are also verified. The method provides an important theoretical guidance for efficient rheological parameters inversion of rockmass in dam area. ©, 2015, Academia Sinica. All right reserved. Source

Han K.,Northwest Research Institute Co. of C.R.E.C | Si X.-D.,Shandong Zhengyuan Construction Engineering Co.
Journal of Railway Engineering Society | Year: 2015

Research purposes: Qingdao Hualoushan Road Metro Station is in slightly weathered rock, on the both ends the composite rock bolting and shotcrete and suspending pile supporting modes open excavation method is used, on the middle section three-bench seven-step excavation method and blasting construction are used. Taking the station project as the background, the deformation law of main station and the surrounding environment was studied by in-situ monitoring test, the construction deformation characteristics of large span metro station in hard rock area were analyzed, the deformation rules were summarized, to provide the reference for the similar engineering construction. Research conclusions: (1) The surface settlement of composite rock bolting and shotcreting section is smaller than suspending pile supporting, the surface subsidence of initial excavation increases fast, and tends to be stable with excavation to floor position. The maximum settlement of the open excavation section is smaller than the subsurface excavation section. (2) In the same depth position, the anchor force of composite rock bolting and shotcrete section is smaller than suspending pile supporting section. Deep horizontal displacement of suspending pile was "inverted trapezoidal" distribution. (3) In the subsurface tunnel, vault settlement and convergence mainly occur in three stages, namely the excavation stage of the upper bench and on the left and right of the middle bench, and begin to slow and steady with excavation of lower bench. (4) The research results can be applied to the construction field of hard rock and large span metro station. ©, 2015, Editorial Department of Journal of Railway Engineering Society. All right reserved. Source

Yan N.,Ocean University of China | Yang J.,Ocean University of China | Dong M.,Ocean University of China | Song W.,Shandong Zhengyuan Construction Engineering Co.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2016

A series of model tests on friction piles in corrosive foundation model were conducted to investigate the settlement characteristics of friction piles (end-bearing friction pile and friction pile) under working load in corrosive foundation. The copper sulfate solution as the corrosive medium was adopted to make the foundation model, which could accelerate surface deterioration speed. Then the settlement law of friction piles with surface deterioration under working load was investigated. The results indicated that the deterioration degree around pile surface increases with time, and the settlements increase with the deterioration degree. The load-settlement curves of end-bearing friction pile and friction pile were different. After 17360 minutes under working load, the percentage of settlement on end-bearing friction pile reaches 28.5% of pile diameter. The settlement caused by skin deterioration is 10.6% which is larger than the settlement of friction pile with 7%. By the end of the test, the settlements of two types of piles reach the settlements corresponding to the ultimate bearing capacities respectively. Surface deterioration can cause significant incensement of friction pile settlement. This may affect the pile normal function. © 2016, Harbin Institute of Technology. All right reserved. Source

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