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Xie J.-B.,Yunnan University | Zeng X.-M.,The Third Research Institute of the Corps of Engineers | Hu J.-Y.,Kunming Junlong Geotechnical Engineering Co. | Wen Y.-B.,Yunnan University | Wu C.-C.,Yunnan University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

Based on the hardening soil model, a deep excavation supported by pile-anchor and pile-braced composite supporting structures is analyzed. The excavation is located in the downtown of Kunming City, and the surrounding environment of the deep foundation pit is complex. The associated parameters of the hardening soil model are designed by consolidated-drained triaxial compression test and consolidation test. Then three-dimensional finite element analysis of the excavation during constructing and supporting processes is carried out using the software of MADIS/GTS. The results of finite element method are compared with the measured data and the calculated results of m-method. The comparison shows that the hardening soil model can be adopted to analyze the deep excavation supported by pile-anchor and pile-braced composite supporting structures. The real deformation mechanism and regularity of foundation excavation can be obtained by using the hardening soil model. Source


Wang G.,Henan Polytechnic University | Wang G.,Anhui University of Science and Technology | Gu J.,The Third Research Institute of the Corps of Engineers | Zhang X.,The Third Research Institute of the Corps of Engineers | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

In order to design new rock bolts improving explosion resisting capacity of tunnels reinforced by rock bolts, the axial force distribution under top explosion was studied by the model test and numerical analysis. Based on the model test, rock bolts of vault bore pressure and tension, according to axial stress distribution along the bolts on vault, the peak tension and peak pressure increased firstly, and then decreased, and the maximal peak pressure was near to anchorage, while the maximal peak tension was near to anchor head. According to numerical analysis, at the same time, the pressure had no difference significantly except that the pressure of anchorage and anchor head was small. The tension of three bolts on vault from anchorage to anchor top increased firstly, and then decreased, and the maximal peak tension was near to anchor top. The pressure and tension of other bolts also had no difference significantly, whose strength was smaller than that of vault. ©, 2014, Academia Sinica. All right reserved. Source


Wang G.,Henan Polytechnic University | Wang G.,Anhui University of Science and Technology | Gu J.,The Third Research Institute of the Corps of Engineers | Chen A.,The Third Research Institute of the Corps of Engineers | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

Based on anti-explosion model test device, the anti-explosion capacity of underground openings, which are reinforced by rock bolts with end wave-decay by holes and reinforced by dense rock bolts, is studied under explosive stress waves produced by focus charging. By comparing anti-explosion capacities of three underground openings, the differences of vertical stresses, relative roof-to-floor displacements of three underground openings, surface strains of three underground openings, accelerations of roof and floor of three underground openings and damage shapes of three underground openings are analyzed. The results show that under explosive stress waves, the relative roof-to-floor displacements and maximum surface strains of underground openings are reduced without severe damage; and the acceleration of roof is also decreased to certain degree. It is also shown that the fractures of underground openings are distributed at both sides of arch foots, but the fractures on the arches of two underground openings are fewer; and their surrounding rocks are lightly damaged. These conditions indicate that the underground openings with end wave-decay by holes and reinforced by dense rock bolts can increase their anti-explosion capacities. Source


Zhang Y.,The Third Research Institute of the Corps of Engineers | Zhao H.,Luoyang Institute of Science and Technology | Zhang X.,The Third Research Institute of the Corps of Engineers
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

The field tests are performed in the anchorage zone of pressure dispersion anchor cable style and the cables are reclaimed. The stress distribution state on the anchorage zone is observed and the equations of the strain and axial force on the anchorage zone are obtained. Field test and the theoretical analysis both show that the unique structure form is a determinant factor for its credible corrosion protection capability, and its bearing capacity and anchoring characters are entirely better than the traditional tension cable style. Otherwise, this cable style has the reclaimable function that has better problem-solving ability of cable overpass allowable scope and can be extensively used in the city foundation pit reinforcement engineering. Source


Wang G.-Y.,Henan Polytechnic University | Wang G.-Y.,Hefei University of Technology | Wang G.-Y.,The Third Research Institute of the Corps of Engineers | Gu J.-C.,The Third Research Institute of the Corps of Engineers | And 3 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

Based on model tests and numerical analysis, failure modes and process under top explosion are studied. According to the results of the model tests, the tunnels reinforced by rockbolts under top explosion have four kinds of failure modes, that is tensile failure, shearing failure, compressive failure, compressive and shearing failure. By analyzing the experimental profile and the propagation rules of stress waves, when the stress waves reach the surface of the tunnel, spalling failure will appear, which may make similar half elliptical rock mass peel off. Both sides of the tunnel produce cracks easily. With the increase of blast load, if the anchor reinforcement strength is weak, local collapse will appear, and once the intensity of anchorage zone is large, it will lead to collapse of the tunnel from spandrel to explosion center. Finally, in accordance with the action process of stress waves, the stress distribution and the development process of plastic zone, failure modes and process are further discussed through numerical analysis. ©, 2015, Chinese Society of Civil Engineering. All right reserved. Source

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