106results about How to "Easy way to determine" patented technology

The invention discloses a metro shield construction general segment assembling point location determining method. A shield tunneling machine is used for conducting shield tunneling construction on a construction tunnel along a tunnel central axis from back to front. After the shield tunneling construction is completed for one link, shield segment assembling construction is carried out. Before anylink of shield segment assembling construction is performed, first of all, segment assembling point locations of current shield segments are determined. Processes include the following steps that firstly, selectable assembling point locations are determined; secondly, selection influence indexes and weight coefficients of the selection influence indexes are determined, and the three selection influence indexes and the weight coefficients of the three selection influence indexes influencing segment assembling point location selection are determined separately; thirdly, the selectable assemblingpoint locations are selectively evaluated, wherein according to a weight coefficient method, the selection of all the selectable assembling point locations is evaluated separately, and the segment assembling point locations of the current shield segments are determined. The shield general segment assembling point location determining method is simple in step reasonable in design, convenient to achieve, good in using effect and capable of conveniently, fast and precisely determining the assembling point locations of the general segments.

The invention discloses a recovery roadway supporting method based on determination of the rise of a caving arch. The method comprises the following steps: (1), excavating a roadway; (2), determining the basic mechanical parameters of surrounding rock and side pressure coefficient of rock masses at two sides of the roadway; (3), determining the rise of limit caving arches, namely determining the rise b2 of the first limit caving arch and the rise b3 of the second limit caving arch according to the determined side pressure coefficient lambda in combination with the basic mechanical parameters of surrounding rock; (4), determining a roadway supporting scheme, namely respectively determining a roadway top plate shallow supporting structure and a roadway top plate deep supporting structure according to b2 and b3; (5), supporting the surrounding rock of the roadway; (6), excavating the next section of roadway, and supporting the surrounding rock of the roadway; and (7), repeating the step (6) for many times till the rectangular roadway is completely excavated and the surrounding rock of the roadway is supported. The recovery roadway supporting method based on determination of the rise of the caving arch, which is disclosed by the invention, is simple in step, convenient to realize, good in use effect and low in construction cost; the top plate of the rectangular roadway can be effectively reinforced; repairing operation of the rectangular roadway is avoided.

The invention discloses a tunnel excavation construction method based on zonal fracturing evolution analysis of surrounding rocks. The tunnel excavation construction method comprises the following steps: performing excavation construction on a constructed tunnel in a mode of multiple segments in the longitudinal extension direction from back to front; when excavation construction on any one of thesegments is carried out, the steps are as follows: 1, determining basic mechanical parameters of the surrounding rocks; 2, performing zonal fracturing evolution analysis on the surrounding rocks; 3,performing pre-grouting reinforcement judgement on the tunnel; 4, performing pre-grouting reinforcement on the tunnel; 5, performing excavation construction on the tunnel; 6, performing excavation construction on the next segment; 7, repeatedly carrying out the step 6 until the whole excavation construction process of the constructed tunnel is completed. The tunnel excavation construction method disclosed by the invention has the advantages of simple steps, reasonable design, convenience in realization and good use effect; before the tunnel is excavated, the zonal fracturing evolution analysisof the surrounding rocks is carried out, and according to a zonal fracturing evolution analysis result of the surrounding rocks, pre-grouting reinforcement is carried out purposely, and the stabilityof the surrounding rocks of the tunnel and the security of the tunnel can be effectively ensured.