A Method for Predicting Hole Spacing of Horizontal High Pressure Grouting in Tunnel Mud Flushing Desilting

Abstract

The invention relates to a hole position space prediction method for tunnel gushing mud desilting horizontal high-pressure grouting. The method comprises the following steps of determining the desilting gushing mud height H inside a tunnel and a slope angle alpha of a gushing mud slope surface; determining the cohesive force c<s>, the inner friction angle phi<s> and the weight r<s> of the tunnel desilting gushing mud; determining the cohesive force c<c>, the inner friction angle phi<c> and the weight r<c> of a high-pressure grouting body; determining the diffusion diameter d of the high-pressure grouting body; determining the integral normalized cohesive force c, the inner friction angle phi and the weight r of the grouting body and a gushing mud body after the high-pressure grouting; determining the unstability angle phi' after the grouting; and determining the hole position space s of the horizontal high-pressure grouting. The hole position space prediction method for the tunnel gushing mud desilting horizontal high-pressure grouting has the advantages that the flow process performance is high; the implementation is convenient; and the result is reliable.

Description

technical field [0001] The invention relates to the field of infrastructure construction, in particular to a method for predicting the distance between horizontal high-pressure grouting holes for mud gushing and desilting in tunnels. Background technique [0002] When tunnels are excavated in fractured and broken zones, intrusive contact zones, and weak interlayers, improper treatment in advance may easily induce water and mud inrush in tunnels. There have been many cases of water and mud inrush in tunnels in my country before. The prominent mud gushing occupies a long distance in the tunnel, ranging from tens of meters to hundreds of meters. For the normal construction of the tunnel, it is necessary to dredge the gushing mud. The water content of the gushing mud is often high and the mechanical properties are poor. Direct excavation of the gushing mud will easily lead to further flow of the gushing mud, which may lead to secondary water and mud inrush disaster. Therefore,...

AI Technical Summary

Problems solved by technology

At present, the hole spacing of high-pressure grouting is mostly determined based on empirical methods. If the hole spacing is too large, the overall strength will be low, and mud gushing may occur; waste

Therefore, the reasonable prediction of the hole spacing of high-pressure grouting at the level of mud gushing is of great significance to both engineering safety and economy, but there is no prediction theory in this area so far.

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