Abstract:The calculation of the pullout force of bonded internal anchor head is a key problem in the design of ground anchor engineering. In this paper, a calculation model considering the joint action between anchor, slurry and geotechnical is proposed, and the theoretical solution of the distribution of internal force and force transmission law of anchor head is given, which provides a tool for further analyzing the anchorage characteristics of ground anchor in geotechnical and developing the design method of anchorage engineering.

Abstract:This paper describes the deformation body force transfer characteristics of anchored rock body in the national "Eighth Five-Year Plan" key scientific and technological research project "Research on the mechanism of prestressing group anchor reinforcement of high slope". Through on-site group anchor test, indoor model test and numerical calculation verification study, it is found that the group anchor stabilization is different from the rigid body method of anchoring the rock body of the dynamic mechanism of force transfer effect, put forward the new parameter theory of anchoring according to the degree of safety, and explore the mechanism of the "rock shell effect" field of the new compressive stress layer on the surface of the rock body to determine the effect of anchoring.

Abstract:Based on the in-situ measured data of the ground expanded anchor, the authors studied and analyzed the design theory of the soil expanded anchor, including its pullout force, the relationship between pullout force and displacement, and put forward the formula for calculating the pullout force of the soil expanded anchor and the calculation method of pullout force-displacement. The correctness of this method is verified by analyzing and comparing with examples.

Abstract:Zhengzhou City Sewage Purification Co., Ltd. Wang Xinzhuang sewage treatment plant project, primary sedimentation tanks a total of 4, the inner diameter of 55 meters, the height of the wall of 4.3 meters. Second sedimentation tanks total of 8, the inner diameter of 57 meters, the height of the wall is 4.75 meters. The thickness of the cast-in-place wall slabs of the primary and secondary sedimentation tanks is 25 centimeters, and the concrete strength class is C40.

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Abstract:Anchor support technology has been widely used in hydropower, railway, bridge, mining, foundation pit and other projects with the characteristics of fast construction, saving money, safety and reliability. This paper is an engineering example of the application of anchorage support technology in the slope support of the pit in the east anchor area of Humen Bridge.

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Abstract:This paper mainly describes the principle and characteristics of spray anchor support and its impact on the surrounding structures; analyzes the common causes of deep foundation pit spray anchor support disaster, combined with engineering examples, puts forward the corresponding prevention and control methods

Abstract:Prestressing anchors have been widely used in the treatment of landslides, collapses, rockfalls, dam foundation reinforcement and other projects. This technology to strengthen the bridge foundation, not yet seen. This paper introduces the project examples in this regard. The project is located in the Three Gorges Project external transportation highway, under the Lienchi Bridge Yichang end of the abutment.

Abstract:At present, the anchor spray reinforcement technology has been in China's mine shaft support occupies an increasing proportion, but due to the support theory lags behind the support engineering practice, anchor spray reinforcement system design often rely on empirical method. Usually, according to the field and other people's experience selected support parameters, although technically feasible, but can not judge whether the optimal. In China, the anchor spray reinforcement of mine roadway

Abstract:The large tonnage prestressing anchorage has been widely valued for its reasonable price, remarkable reinforcement effect and quick effect. After economic and technical comparison, Shiquan Hydropower Station chose prestressing anchorage solution to strengthen the dam body, through optimized design and careful construction, 30 bundles of 6-8MN grade anchors were successfully applied. Achieved significant economic and social benefits, and to expand the application and development of prestressed anchorage technology provides favorable conditions.