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Kou H.-L.,Qingdao Technological University | Zhang M.-Y.,Qingdao Technological University | Zhang J.-K.,China Petroleum East China Design Institute
Gongcheng Lixue/Engineering Mechanics | Year: 2012

The change of penetration resistance of jacked piles in interactive soft and hard layered soil is analyzed. Different constitutive models have been adopted, including modified cam clay model for cohesive soil and Modified Drucker-Prager model for sand in order to simulate the penetration of jacked piles more reasonably in layered soil particularly in interactive cohesive and sandy layered soil with ABAQUS. Simultaneously, a series of other measures are taken to make the initial stress equilibrium in layered soil. Combining with an engineering case, the process of successive penetration of jacked pile in layered soil with significantly different properties and stiff soil-interlayer in soft soil is simulated and calculated successfully, with the variation cure of pile resistance with depth in penetration process being obtained, which can reflect the abrupt change phenomenon of stress around pile and jacking resistance. The conclusion of numerical analysis is consistent with the field observations. The research results can help probability analysis on penetration of jacked piles and pile squeezing effect.


Zhou D.,TU Munich | Cao L.,China Railway Siyuan Survey and Design Group Co. | Ma Y.,China Petroleum East China Design Institute | Fang S.,China Railway Eryuan Engineering Group Co. | Wang K.,Tongji University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

Based on the largest highway tunnel with two holes and eight lanes in China, the contents, technique and method of the stress monitoring of the support system are described. The tunnel stresses during different construction procedures are monitored and analyzed. The results show that: (1) The construction of the up-stage in the right hole, the down-stage in the left hole and the up-stage of the core soil are the main points changing the stress distribution of the support system greatly. (2) The enclosure of lining and using of the cross anchor are effective methods to improve the performance of lining and restrain the deformation of the tunnel. Therefore, it is important to construct the inverted arch and enclose the lining. The results can be adopted in the design, construction and research of similar tunnels.


Zhou D.,TU Munich | Cao L.,China Railway Siyuan Survey and Design Group Co. | Fang S.,China Railway Eryuan Engineering Group Co. | Qu H.,Shanghai Investment Consulting Corporation | Ma Y.,China Petroleum East China Design Institute
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

The mechanical behaviors of twin tube large cross-section tunnels with a total of eight traffic lanes are complex, and the construction methods diverse. In-situ test of the lining structure was conducted for the largest cross-section four-lane highway tunnel in China, and the 3D-effect of the deformation and stress of the lining structure constructed using the double-side-drift method was analyzed. The results indicated that during the construction, the excavation of the lower bench in the left drift and the bench in the core rock significantly affected the deformation and stress of the support structure. The longitudinal range of influence of the excavation of the tunnel is about 1 to 1.5 times of the drift span, from 8 to 12 m ahead of the work face.


Ma Y.-F.,China Petroleum East China Design Institute | Zhou D.-H.,TU Munich | Zhang Z.-H.,China Petroleum East China Design Institute | Cao L.-Q.,China Railway Siyuan Survey and Design Group Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

Foundation treatment of large-scale refinery is very complex. In view of this condition, in-situ test of vibro-replacement stone pile was carried out. With static cone penetration test dynamic penetration, pile density was detected and saturated sand liquefaction was judged. Based on results of pressuremeter test, standard penetration test and heavy dynamic penetration test, foundation bearing capacity change and soil engineering characteristics change during construction process of vibro-replacement stone piles were analyzed. The bearing capacity of composite foundation was evaluated by static load test of single pile and composition foundation. The results show as follows. Firstly, vibro-replacement stone pile has a compaction effect on the sand soil of pile length range. Engineering characteristics and field uniformity has been improved apparently. Sand liquefaction possibility for pile length range can be eliminated. Secondly, static load test results show that the bearing capacity of composite foundation has reached the design requirement. Thirdly, the compaction effect on clay soil, which is under sand soil layer, is not apparent. And soil strength in some depth range even reduces. Finally, the bearing characteristics will not significantly be affected when no more than 5 m thickness of soft soil interlayer exists 10 m depth below the ground surface. ©, 2015, Academia Sinica. All right reserved.

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