Control method of surrounding rocks in water-rich very-broken surrounding rock tunnel collapse sections

Abstract

The invention relates to the field of tunnel engineering construction, in particular to a control method of surrounding rocks in water-rich very-broken surrounding rock tunnel collapse sections. According to the control method, problems in the existing methods that managing circle is long, reinforcing range and effect are bad, secondary geological disasters are triggered easily because of deformation and cracking of exceeding clearance limit of preliminary bracing and the like are solved. The method includes the following steps: searching and analyzing factors leading to collapse and disaster degree, stabilizing exposed face of an accumulation body and dewatering and decompressing deep parts, strengthening supporting intensity in the collapse sections and influencing areas, outburst prevention filling and strengthening the collapse accumulation body, grouting reinforcing asymmetrical peripheral curtains, confirming an excavating method in grouting reinforcing collapse sections and primary supporting patterns, replenishing grouting in parts, excavating inverted arches, and constructing second liners. The control method of surrounding rocks in water-rich very-broken surrounding rock tunnel collapse sections has the advantages that collapse disposing construction period of water-rich very-broken surrounding rock tunnels is shortened, reinforcing range and intensity of the surrounding rocks are guaranteed, grouting reinforcement is fully conducted on the surrounding rocks in direct collapse areas, deformation in the preliminary bracing is relieved, occurrence of the exceeding clearance limit and the secondary geological disasters is avoided, disposing quality of collapse accidents is improved effectively, and good social benefit and economical benefit are created.

Description

technical field [0001] The invention relates to a surrounding rock control method for a collapse section of a water-rich extremely broken surrounding rock tunnel, belonging to the field of tunnels and underground engineering. Background technique [0002] With the rapid development of my country's transportation construction, the proportion of mountain tunnels is increasing. Affected by complex geological structure conditions and topographic and geomorphic factors, mountain tunnel projects in my country often pass through extremely loose rock masses such as fractured fracture zones and dissolved cavity deposits. Under the comprehensive action of groundwater, ground stress and the broken structure of loose surrounding rock mass, the initial support deformation, cracking and damage are often caused by sudden changes in engineering geology and hydrogeological conditions, or insufficient support structure and strength design, leading to large-scale landslide accidents. The land...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a water-rich pole crushing method aiming at the unsatisfactory treatment effect, serious deformation and cracking of the initial support, and easy geological disasters caused by the treatment method of the water-rich fault fracture zone or the surrounding rock tunnel collapse of the karst collapse cavity accumulation body. Surrounding Rock Comprehensive Control Method for Tunnel Collapse Section

Images