CN102704438B - Test method for operation safety of tunnel under effect of external water pressure - Google Patents
Test method for operation safety of tunnel under effect of external water pressure Download PDFInfo
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- CN102704438B CN102704438B CN201210209951.0A CN201210209951A CN102704438B CN 102704438 B CN102704438 B CN 102704438B CN 201210209951 A CN201210209951 A CN 201210209951A CN 102704438 B CN102704438 B CN 102704438B
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Abstract
The present invention relates to a kind of test method for operation safety of tunnel under effect of external water pressure.The object of this invention is to provide a kind of test method for operation safety of tunnel under effect of external water pressure, the method of setting-out is utilized to simulate high external water pressure effect, evaluate the stability of tunnel run duration, accomplish to be consistent with field condition, with the limitation of the drawback and proper calculation method that overcome method for numerical simulation as far as possible.Technical scheme of the present invention is: test method for operation safety of tunnel under effect of external water pressure, it is characterized in that step is as follows: a, excavation Test Tunnel; B, in the middle part of Test Tunnel, choose the tunnel of 1 times of hole electrical path length as supporting district, and carry out system supporting, choose the tunnel of 1 times of hole electrical path length as non-supporting district; Described supporting district and non-supporting district are not less than the length in 1 Bei Dong footpath to the distance at Test Tunnel two ends; C, carry out packer permeability test in supporting district and non-supporting district respectively, and carry out the monitoring of system.The present invention is applicable in Hydraulic and Hydro-Power Engineering.
Description
Technical field
The present invention relates to a kind of test method for operation safety of tunnel under effect of external water pressure, be mainly applicable in Hydraulic and Hydro-Power Engineering.
Background technology
At present, a lot of hydroelectric project of China adopts water channeling type exploitation, and in order to ensure the safety of tunnel runtime, usually adopt buried arrangement, diversion tunnel bears the effect of high external water pressure by having under such conditions.And lining cutting is mainly played reinforcing, support, maintained the effect of three aspects, lining cutting must cooperatively ensure the stable of country rock under effect of water pressure outside with the preliminary bracing of rock mass.But because the rock masses fracturing of free face near after tunnel excavation is serious, water guide structure is grown, and transmission coefficient comparatively rockmass is significantly improved, and total system will bear huge external water pressure, and overall security meets a severe test.
Under buried environment, high-ground stress, under high external water pressure, long-term mechanical characteristic and the shallow embedding engineering of country rock are diverse, directly cause complexity and the particularity of Lining Load thus, the pressure that existing country rock TERM DEFORMATION produces, also external water pressure is had, and country rock TERM DEFORMATION pressure had both come from the dilatancy that heavily stressed lower country rock season cracking produces, also coming from seepage field change causes effective stress in country rock to change the additional deformation caused, therefore, traditional lining design theory has been not suitable with this complex situations, method for designing in current specification may be difficult to fully assess and consider the action effect of these extreme conditions.
Although numerical computation method made great progress more in the past, but due to the extreme complexity of rock mass itself and the factor such as mechanical response, Environmental effect thereof, adopt numerical method cannot simulate the actual rupture event of on-the-spot country rock on the one hand, particularly along with the continuous evolution of engineering excavation surrounding environment, the actual influence for engineering cannot accurate evaluation; On the other hand cannot the seepage field particularly fracture seepage feature of accurate reproduction rock mass inside, suitable simplification must be carried out to the actual conditions at scene, cannot make the safety of tunnel engineering and evaluating accurately.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of test method for operation safety of tunnel under effect of external water pressure for above-mentioned Problems existing, by the simulation to different supporting measure, the actual excavation situation at true reappearance scene, utilize the method for setting-out to simulate high external water pressure effect simultaneously, evaluate the stability of tunnel run duration, accomplish to be consistent with field condition as far as possible, with the limitation of the drawback and proper calculation method that overcome method for numerical simulation, evaluate the safety outside under effect of water pressure of country rock and support system under different supporting scheme.
The technical solution adopted in the present invention is: test method for operation safety of tunnel under effect of external water pressure, it is characterized in that step is as follows:
A, excavation Test Tunnel, and control its length and be not less than 4 Bei Dong footpaths;
B, in the middle part of Test Tunnel, choose the tunnel of 1 times of hole electrical path length as supporting district, and carry out system supporting according to the actual supporting measure in scene, choose the tunnel of 1 times of hole electrical path length as non-supporting district simultaneously; Described supporting district and non-supporting district are not less than the length in 1 Bei Dong footpath to the distance at Test Tunnel two ends;
C, carry out packer permeability test in supporting district and non-supporting district respectively, and carry out the monitoring of system, wherein the monitoring project in supporting district comprises the sonic test of anchor stress monitoring, water pressure monitoring, lining cutting stress monitoring and damage propatagtion, and the monitoring project in non-supporting district comprises water pressure monitoring and sonic test.
The size of described Test Tunnel is identical with the real size of on-the-spot tunnel.
Supporting measure in step b comprises combined bolting and shotcrete and liner supporting.
The invention has the beneficial effects as follows: the present invention excavates a Test Tunnel consistent with on-site actual situations, by the simulation to different supporting measure, the actual excavation situation at true reappearance scene, utilize the method for setting-out to simulate high external water pressure effect simultaneously, safety under tunnel outside effect of water pressure is carried out to the test of system, be conducive to making rational evaluation to the safety of deep-lying tunnel runtime, thus compensate for the defect of proper calculation method and numerical computation method, be also that the safe operation of the type tunnel from now on provides more reliable technical support.
Accompanying drawing explanation
Fig. 1 is structure chart of the present invention.
Fig. 2 is the A portion enlarged drawing of Fig. 1.
Detailed description of the invention
As shown in Figure 1, the test procedure of the present embodiment is as follows:
A, excavation Test Tunnel 1, and the ratio controlling its size and on-the-spot tunnel real size is 1:1, makes it be consistent with on-site actual situations as far as possible, the length of this Test Tunnel is preferably not less than 4 Bei Dong footpaths, and in this example, the length of Test Tunnel 1 is 4 Bei Dong footpaths.
B, Test Tunnel 1 being divided into four sections, being wherein positioned at two sections of two ends for eliminating face effect, the length of middle two sections is 1 Bei Dong footpath, is respectively supporting district 1-1 and non-supporting district 1-2, contrasts to facilitate; Wherein supporting district 1-1 carries out system supporting according to the actual supporting measure in scene, comprises spray anchor and lining cutting.This example due to Test Tunnel 1 total length be 4 Bei Dong footpaths, therefore four segment length are 1 Bei Dong footpath; When Test Tunnel 1 length is greater than 4 Bei Dong footpath, two segment length being positioned at two ends are equal and be greater than 1 Bei Dong footpath, and the length of middle two sections is then always 1 Bei Dong footpath.
If the permeability of the on-the-spot country rock of c is more than 1Lu, be then necessary to carry out curtain grouting, the seal of country rock during to ensure setting-out.In this example, curtain grouting hole 9 arranges two groups altogether, and is arranged symmetrically with centered by supporting district 1-1, and namely two groups of curtain grouting holes 9 are 1 Bei Dong footpath to the minimum distance of supporting district 1-1.
D, carry out packer permeability test at supporting district 1-1 and non-supporting district 1-2 respectively, and carry out the monitoring of system, wherein the monitoring project of supporting district 1-1 comprises the sonic test of anchor stress monitoring, water pressure monitoring, lining cutting stress monitoring and damage propatagtion, and the monitoring project of non-supporting district 1-2 comprises water pressure monitoring and sonic test.For supporting district 1-1, packer permeability test device and monitoring system layout structure are as shown in Figure 2, wherein monitoring system comprises and is arranged in the osmometer 3 between hole wall and lining cutting 2, the bolt stress meters 5 be installed on anchor pole 4, and be positioned at the strain meter 6 on lining cutting 2 surface, wherein anchor pole 4 anchored end is anchored in the country rock 7 of Test Tunnel 1 periphery, and bolt stress meters 5 is positioned at country rock 7 equally; Packer permeability test device is the setting-out steel pipe 8 in an embedding country rock 7, and its two ends are consolidation section 8-1, and centre is the floral tube section 8-2 for water outlet, and two consolidation sections are connected with country rock 7 and lining cutting 2 consolidation respectively.In order to the long-term safety in evaluation test hole 1, also need to carry out long-term monitoring to it.
The present invention determines rational water pressure according to the groundwater table of tunnel present position, feedback under utilizing the means of testing of system to collect the long-term effect of water pressure outside of tunnel, by contrast supporting section and the mechanical response of non-supporting section, obtain the safety Design method of tunnel within the runtime and evaluation criterion.The present invention can directly for the aspect such as design of its support, grout penetration, grouting pressure, passed examination standard of formally constructing provides reference frame.
Claims (2)
1. a test method for operation safety of tunnel under effect of external water pressure, is characterized in that step is as follows:
A, excavation Test Tunnel (1), and control its length and be not less than 4 Bei Dong footpaths;
B, choose the tunnel of 1 times of hole electrical path length as supporting district (1-1) at Test Tunnel (1) middle part, and carry out system supporting according to the actual supporting measure in scene, choose the tunnel of 1 times of hole electrical path length as non-supporting district (1-2) simultaneously; Described supporting district (1-1) and non-supporting district (1-2) are not less than the length in 1 Bei Dong footpath to the distance at Test Tunnel (1) two ends;
C, carry out packer permeability test at supporting district (1-1) and non-supporting district (1-2) respectively, and carry out the monitoring of system, wherein the monitoring project of supporting district (1-1) comprises the sonic test of anchor stress monitoring, water pressure monitoring, lining cutting stress monitoring and damage propatagtion, and the monitoring project of non-supporting district (1-2) comprises water pressure monitoring and sonic test;
Supporting measure in step b comprises combined bolting and shotcrete and liner supporting;
Described anchor stress monitoring is for being installed on the bolt stress meters (5) on anchor pole (4); Water pressure monitoring is for being arranged in the osmometer (3) between hole wall and lining cutting (2); Lining cutting stress monitoring is for being installed on the strain meter (6) on lining cutting (2) surface;
The packer permeability test device carrying out packer permeability test in step c is the setting-out steel pipe (8) in an embedding country rock (7), its two ends are consolidation section (8-1), centre is the floral tube section (8-2) for water outlet, and two consolidation sections are connected with country rock (7) and lining cutting (2) consolidation respectively.
2. test method for operation safety of tunnel under effect of external water pressure according to claim 1, is characterized in that: the size of described Test Tunnel (1) is identical with the real size of on-the-spot tunnel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210209951.0A CN102704438B (en) | 2012-06-25 | 2012-06-25 | Test method for operation safety of tunnel under effect of external water pressure |
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| CN201210209951.0A CN102704438B (en) | 2012-06-25 | 2012-06-25 | Test method for operation safety of tunnel under effect of external water pressure |
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| CN102704438A CN102704438A (en) | 2012-10-03 |
| CN102704438B true CN102704438B (en) | 2015-11-25 |
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| CN103308399A (en) * | 2013-05-29 | 2013-09-18 | 中国水电顾问集团华东勘测设计研究院 | Suitability evaluation test method of different support systems under effect of impact load |
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