Zhoukoudian (ZKD), a tiny village, is about 50 kilometers southwest of downtown Beijing. Since ancient times, it has been noted for its abundant trove of mammal fossils, as the hilly area in the vicinity is at the end...Zhoukoudian (ZKD), a tiny village, is about 50 kilometers southwest of downtown Beijing. Since ancient times, it has been noted for its abundant trove of mammal fossils, as the hilly area in the vicinity is at the end of a dismembered branch of the Taihang Mountains, where they meet the North China Plain. There are a lot of well-developed and well-preserved Pleistocene sediments with valuable fossilized records in this area. Its great value for the study of human ancestry was first discovered by Western scholars in 1921.展开更多
The basic characteristics of the soft rock roadway under the dynamic pressure are analyzed. At the same time, the three fundamental approaches for controlling the surrounding rock are proposed, which are improving the...The basic characteristics of the soft rock roadway under the dynamic pressure are analyzed. At the same time, the three fundamental approaches for controlling the surrounding rock are proposed, which are improving the surrounding rock strength, lowering the rock mass stress and selecting the reasonable supporting technology. The research results are elucidated, including the distribution of the surrounding rock plastic zone, the movement and damage of the surrounding rock under the dynamic pressure, controlling the floor heave through reinforcing the roadway walls and corners, the new route to develop the roadway metal supporting technique, the key theory and technique for the bolt supporting in the coal roadway, the performance and prospect of the ZKD high water content quick setting material, and so on. Finally, some personally views are put forward about the roadway metal supporting, bolt supporting, new material and the stress relief under the high stress condition.展开更多
文摘Zhoukoudian (ZKD), a tiny village, is about 50 kilometers southwest of downtown Beijing. Since ancient times, it has been noted for its abundant trove of mammal fossils, as the hilly area in the vicinity is at the end of a dismembered branch of the Taihang Mountains, where they meet the North China Plain. There are a lot of well-developed and well-preserved Pleistocene sediments with valuable fossilized records in this area. Its great value for the study of human ancestry was first discovered by Western scholars in 1921.
文摘The basic characteristics of the soft rock roadway under the dynamic pressure are analyzed. At the same time, the three fundamental approaches for controlling the surrounding rock are proposed, which are improving the surrounding rock strength, lowering the rock mass stress and selecting the reasonable supporting technology. The research results are elucidated, including the distribution of the surrounding rock plastic zone, the movement and damage of the surrounding rock under the dynamic pressure, controlling the floor heave through reinforcing the roadway walls and corners, the new route to develop the roadway metal supporting technique, the key theory and technique for the bolt supporting in the coal roadway, the performance and prospect of the ZKD high water content quick setting material, and so on. Finally, some personally views are put forward about the roadway metal supporting, bolt supporting, new material and the stress relief under the high stress condition.
