31 results about "Yield pressure" patented technology

The invention relates to a construction method of a walling and filling combined gob-side entry retaining wall body. The construction method comprises the following steps of: closely following forward propulsion of a stope face, erecting dense single supports at a gob retaining side at the rear part of a fully mechanized mining bracket, so that a space of a tunnel at the rear part of the stope face is retained; walling a square template wall with concrete pier blocks under the mask of the dense single props; meanwhile, installing counter-pulled anchor rods which penetrate through the template wall bodies, and carrying out lateral reinforcing on the template wall bodies; carrying out grouting filling on a hollow part defined by the template walls through injected holes reserved on the template walls till the internal spaces of the template walls are filled with grout; carrying out uniform whitewashing treatment on the wall at one side of a gob retaining tunnel to form a concrete spray layer; and sequentially circulating the steps along with propulsion of the stope face till construction of the whole gob-side entry retaining wall body is finished. According to the construction method disclosed by the invention, a brickwork wall and a filling support are combined together, so that the construction method is simple and convenient and simple to operate and ensures that the wall body has high strength and can yield pressure suitably; and length of each walling of the wall body is consistent with the everyday propulsion degree of the stope face, and the construction method is flexibly suitable for actual mining.

The invention provides a circumferentially compressible composite well wall and a construction method thereof which are most applicable to improving the bearing capability of a vertical well wall. The composite well wall comprises a waterproof outer well wall and a circumferentially compressible inner well wall; and the inner wall is provided with at least one compressible insulating layer. In the construction method, firstly, the waterproof outer well wall is built from top to bottom according to the section height; then the inner wall embedded with the compressible insulating layer is builtfrom bottom to top; and finally the wall is built to the designed height according to the section height. When water and soil pressure effects surrounding the composite well wall, the compressible insulating layer of the inner well wall is compressed for yielding pressure so as to enable the stress to be distributed more evenly along the radial direction of the well wall, thus effectively improving the bearing capability of the well wall, effectively reducing the thickness of the existing well wall, improving the utilization ratio of the shaft section, and reducing the engineering cost to a large extent.