Control method of surrounding rocks in water-rich very-broken surrounding rock tunnel collapse sections
A control method and surrounding rock control technology, applied in the direction of tunnels, tunnel linings, drainage, etc., can solve problems such as support deformation and cracking, prone to geological disasters, and unsatisfactory treatment effects, so as to reduce difficulty, avoid another collapse and roof fall, The effect of enhancing the self-stabilizing ability and bearing strength
Active Publication Date: 2013-12-04
SHANDONG UNIV
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[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
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[0042] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0043] A. Exploration and analysis of landslide disaster-causing factors and disaster-causing degree
[0044] Comprehensively analyze the engineering geological and hydrogeological data exposed during the tunnel survey period and construction, analyze the geological structure characteristics, stratum lithology characteristics and topographic and geomorphic conditions in the tunnel collapse area, and find out whether there are large-scale fault fracture zones and strata in the collapse area 1 Weathering degree, expansive mineral content; analysis of surface catchment conditions, groundwater recharge and runoff conditions in the region, and comprehensive research on disaster-causing factors of tunnel collapse. At the same time, the scope of landslide area 1 and landslide affected area 2 is explored by means of geologica...
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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...
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IPC IPC(8): E21D11/10E21D11/00E21F16/02
Inventor 李术才张伟杰张庆松张霄刘人太张连震朱明听
Owner SHANDONG UNIV