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Hu Z.,Changan University | Wang Q.,Changan University | Luo L.,Changan University | Ma S.,Changan University | And 2 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2014

Based on the sites with y-shape ground fissure near the Chang'an overpass in Xi'an city where the ground fissures are F6 and F6', a shaking table test with the scale of 1:15 was carried out to study the seismic response difference between primary and secondary ground fissures for the sites with y-shape ground fissure. By using El Centro wave, results are achieved as follow. Firstly, the amplification coefficients of response acceleration for two sides of primary and secondary ground fissures decrease generally with the increase of exciting peak acceleration, but an inflection point appears at 300Gal of excitation peak acceleration. The amplification coefficient of primary ground fissure at the bottom is larger than that of secondary ground fissure, while the difference in response accelerations on the top and middle of primary and secondary ground fissures is not significant. Secondly, the acceleration responses at the bottom may obviously be strengthened with departing the primary and secondary ground fissures. Before the exciting peak acceleration reaches 200Gal, the acceleration response on the middle may be attenuated with departing the primary and secondary fissures, but this regularity is reversed on the top of primary ground fissure. The difference in decaying trend of acceleration response between primary and secondary ground fissures is not remarkable. Thirdly, the acceleration response of footwall on the top of primary and secondary ground fissures is larger than that of hanging wall, but this regularity is reversed at the bottom of primary and secondary ground fissures. With the exciting acceleration, the effect of hanging wall and footwall is not obvious and its correlation with primary and secondary ground fissures is not obvious either. Source


Wang J.,Zhengzhou University | Shen X.,China JiKan Research Institute of Engineering Investigations and Design | Li Z.,Zhengzhou University | Zhao Z.,Ningbo University of Technology | Zhao J.,Zhengzhou University
World Information on Earthquake Engineering | Year: 2015

Finite element analysis of lead-rubber bearings was carried out, the influence of vertical load on the mechanical properties of lead-rubber bearings was studied. The results show that as the vertical load increases, the ultimate displacement of the bearing decreases, the bearing is easy to buckle. As the vertical load increases, the post-yield stiffness and the equivalent stiffness decrease, and the equivalent damping ratio increases. In bidirectional compress-shear state, the vertical load has greater influence on the mechanical properties of the bearings. Therefore, the influence of the vertical load on the mechanical properties of the bearing should be considered to ensure the stability of the bearing. ©, 2015, Science and Technology Periodical Press. All right reserved. Source


Li J.,Xian University of Technology | Li J.,Shaanxi University of Technology | Liu F.,Xian University of Technology | Wang L.,China JiKan Research Institute of Engineering Investigations and Design | And 3 more authors.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2015

The research of soil-water characteristic curve (SWCC) will become the key of unsaturated soil. A test is carried out by GCTS SWCC device for soil water characteristic curve for different initial dry density, drying-wetting cycle and different stress conditions. We calculate the hysteresis degrees of soil during various measurement conditions, using the concept has proposed hysteretic degrees. On the fitted curve of experiments were analyzed to study the factors that effecting hysteresis characteristics of soil water characteristic curve. The causes of such factors are discussed theoretically. It shows that hysteresis characteristic of soil water characteristic curve can be traced to the change of the pore volume and these results will be more favourable guidance on unsaturated soil properties. ©, 2015, Shuili Xuebao/Journal of Hydraulic Engineering. All right reserved. Source


Zhang W.,Northwest Agriculture and Forestry University | Zhang A.,Northwest Agriculture and Forestry University | Xing Y.,China Institute of Water Resources and Hydropower Research | Song Z.,Northwest Agriculture and Forestry University | And 2 more authors.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2015

Karez and motor-pumped wells have long been two kinds of important irrigation infrastructures in Turpan. However, because the motor-pumped wells layout and water resources exploitation are not in a scientific manner, the groundwater level has fallen off below a normal level, treating the existence of Karez. Firstly, the hydrogeological situations of the pluvial fan in front of the flame mountain in Xinjiang are investigated, then the water quantity model of Karez is established according to its unique working mechanism. The influences of location, number and discharge of motor-pumped wells as well as groundwater level on the Karez water quantity are analyzed. The results show that the Karez water quantity has a negative relationship with the distance between a Karez and a well, and the influence depends upon the location and the layout of the wells. A single well has a very limited impact upon the water quantity, while multi-well have more influence. The conservation of Karez should be emphasized on the control of underground water level, meanwhile the number of motor-pumped wells and their discharge should be strictly regulated. ©, 2015, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved. Source


Zheng Y.,Shanghai JiaoTong University | Zhang L.,Shanghai JiaoTong University | Yu Y.,China JiKan Research Institute of Engineering Investigations and Design | Zheng J.,China JiKan Research Institute of Engineering Investigations and Design
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

In the road foundation engineering, the settlement of the soft soil foundation is difficult to predict. Nowadays, the widely used inverse analysis which focuses on single object, cannot consider all complex changes in the surrounding environment, and soil parameters obtained by inverse analysis are unreliable, which make poor prediction. A multi-objective inverse analysis method based on the Pareto optimality theory and the unsaturated soil consolidation theory can use a variety of monitoring data at the same time. Foundation settlement and pore water pressure are made as double objectives. Results show that the soil parameters obtained by back analysis are more reasonable and the prediction of the settlement is more precise, which can be widely used in the road foundation engineering. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved. Source

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