Zhang H.-L.,Anhui University of Science and Technology |
Zhang H.-L.,China University of Technology |
Wang L.-G.,China University of Technology |
Qin H.,SANY Heavy Industries Company Ltd
Yantu Lixue/Rock and Soil Mechanics | Year: 2012
According to the sides' surrounding rocks characteristics of the mining roadway on the work-face with large mining height, a mechanics model about crack board structure of the sides surrounding rocks is established based on the fracture damage theory and plasticity theory, and the instability mechanism of the surrounding rocks of the mining roadway in the Xinzhi Mine, Houzhou Coal is analyzed, and the grouting-cable method is first used in supporting the surrounding rocks of the sides to limit it to be cut down. The results show that there are a lot of rock fissures in the sides of the back-extraction roadway, and the rock fissures develop under high stress, it makes the surrounding rocks of the sides evolve into the spallation board structure. When the multiple bearing pressure on the sides is greater than the smallest bucking critical load, the parts of sides will be cut down. With the increasing of the elastic modulus and spallation board thickness of coal rockmass, the failure scale of the spallation plate expands when instability occurs. Grouting-cable can be used to fill the deep fractures of the surrounding rocks, makes surrounding rocks as a whole, and improves the bearing capacity of supporting structure around the surrounding rocks of the roadway.
Hunan Sany Intelligent Control Equipment Co. and Sany Heavy Industries Co. | Date: 2011-06-22
A detecting device for detecting the volume of a material in a material container and a concrete pumping apparatus comprising the above detecting device are disclosed. The detecting device comprises a soft container full of a medium; a medium container in communication with the soft container; a volume detecting sensor for detecting the volume of the medium in the medium container; the soft container is provided within the material container and immersed in the material of the material container, and under the extrusion of the material, the medium in the soft container enters the medium container, the volume detecting sensor detects the volume of the medium in the medium container; and the volume of the material can be calculated according to a preset relationship between the volume of the medium in the medium container and the volume of the material in the material container.