On Nov 20, The mid-term inspection meeting of the Yunnan Puxuan Highway Project (Study on Key Design and Construction Technology of Suspension Bridge Tunnel Anchorage in Alpine and Gorge Region) is held in Wuhan. The inspection meeting is organized by Headquarter of Yunnan Puxuan Highway, and the inspection committee consists of 7 experts including Academician GE Xiurun, Professor ZHOU Chuangbing, Professor HAO Xianwu, Professor LI Xinping and researcher ZHENG Hong.

Suspension bridge is a flexible structure, the deformation and stability of anchor under the effect of designed load will directly influence the stability and safety of the main tower of suspension bridge and the whole bridge system. Therefore, reasonable evaluation of the anchor bearing characteristics is the key of bridge design.

Tunnel anchor has fewer disturbances to the environment, and it is able to reduce engineering cost and construction period. However, because of the complexity of geological environments, the design mainly relies on experience and project analogy. Projects are based on sufficient investigation and material collection. Through field tests, indoor tests, and relevant numerical calculation, projects quantize and verify rock-anchor system bearing capacity and deformation mechanism; analyze the influence of anchor displacement to superstructure, evaluate the stability of anchorage zone slope.

After listening to the research achievement report of project team, the inspection committee addresses inquiries to relevant questions. After research and discussion, the inspection committee come to an agreement that, this project studies on similar material of class Ⅲ、Ⅳ surrounding rock in indoor model test, doing tunnel anchor indoor geomechanics model tests under conditions with different anchoring concrete-plug buried depth and different geometry size. The project has also done sensitivity test of surrounding rock properties and different structure of single and double anchor, they find out　the tunnel anchor bearing capacity change and surface deformation rules. In the numerical calculation part of the project, researchers have three-dimension numerical stimulation study on indoor model and field  geomechanics model, finding out the surrounding rock displacement, stress, plastic zone and other change law, exploring deformation mechanism of tunnel anchor surrounding rock. Meanwhile, researchers explore the relationship between finite load and other parameters through sensitivity analysis of relevant parameters. The mid-term research achievements have reached expected target. The inspection committee suggests that the project should enhance indoor model test and numerical stimulation research on the interaction between tunnel anchor structure and surrounding rock, and enhance the comparative study between field test, indoor model test and numerical stimulation.