CN109457683B - Bearing capacity detection device for layered rock mass under rainwater penetration - Google Patents
Bearing capacity detection device for layered rock mass under rainwater penetration Download PDFInfo
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- CN109457683B CN109457683B CN201811555403.7A CN201811555403A CN109457683B CN 109457683 B CN109457683 B CN 109457683B CN 201811555403 A CN201811555403 A CN 201811555403A CN 109457683 B CN109457683 B CN 109457683B
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- supporting frame
- bearing capacity
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- 239000011435 rock Substances 0.000 title claims abstract description 91
- 230000035515 penetration Effects 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000004088 simulation Methods 0.000 claims abstract description 19
- 238000001764 infiltration Methods 0.000 claims abstract description 18
- 230000008595 infiltration Effects 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 238000012423 maintenance Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 210000000416 exudates and transudate Anatomy 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 6
- 239000002689 soil Substances 0.000 abstract description 5
- 238000002474 experimental method Methods 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007646 directional migration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000105 evaporative light scattering detection Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004162 soil erosion Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
Abstract
The invention provides a bearing capacity detection device for layered rock mass under rainwater penetration, which comprises a supporting frame, a simulation box body, a rainwater spraying mechanism, a stressing jack, a dial indicator, a filter screen and a water collecting tank, wherein the simulation box body is arranged on the supporting frame; the simulation box body is arranged in the supporting frame, and a layered rock mass is arranged in the simulation box body; the rainwater spraying mechanism comprises a water seepage tank arranged at the top of the layered rock mass and a water inlet pipe communicated with the water seepage tank; the base of the force-applied jack is arranged on the supporting frame, and the piston rod of the force-applied jack points downwards to the water seepage tank; the upper rod of the dial indicator is fixed on the supporting frame, and the measuring head points to the layered rock mass; the filter screen is supported at the bottom of the layered rock mass; the water collecting tank is arranged below the filter screen. According to the detection device provided by the invention, the influence of field rainwater on the bearing capacity of the layered rock body is realized by simulating the infiltration of rainwater, and the quality of solid rock brought out by infiltration is determined through experiments, so that the quality relation between different compressive strengths and samples after water and soil loss is established, and a basis is provided for field geotechnical engineering construction.
Description
Technical Field
The invention belongs to the technical field of rock mass detection, and particularly relates to a bearing capacity detection device for layered rock mass under rainwater penetration.
Background
Along with the rapid development of the traffic in China, the construction of the road and railway in the wild is increasingly carried out. Most of the construction of railway and highways is subject to rock mass problems, especially layered rock masses with low bearing capacity. Layered rock mass is widely found in nature and its layer is a structural surface formed by geological actions such as mineral deposition, invasion or directional migration. Most of coal-based strata are layered rock bodies, physical and mechanical properties of rock layers forming roadway surrounding rocks are often different, sometimes even very different, and the mechanical properties are very complex. As the layered rock mass is a very complex discontinuous material and is formed by the action of sedimentary rocks and has the characteristic of alternately softness and hardness, the bearing capacity of the layered rock mass cannot be conveniently and rapidly measured in construction, and the bearing capacity of the layered rock mass under the influence of rainwater cannot be measured, so that potential safety hazards and material waste can be caused.
Disclosure of Invention
The invention aims to provide a bearing capacity detection device for a layered rock body under rainwater infiltration, and aims to solve the technical problem that the rainwater infiltration bearing capacity cannot be tested in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: there is provided a bearing capacity detection device for a layered rock mass under rainwater penetration, comprising:
A support frame;
the simulation box body is arranged in the supporting frame and is provided with at least four side walls which are connected in sequence, and a layered rock mass is arranged in the simulation box body;
The rainwater spraying mechanism comprises a water seepage tank arranged at the top of the layered rock body and used for seepage water to the layered rock body and a water inlet pipe communicated with the water seepage tank, and the water inlet pipe supplies water into the water seepage tank by means of a water pump;
the base of the force-applying jack is arranged on the supporting frame, the piston rod of the force-applying jack points downwards to the water seepage tank, and pressure is applied to the layered rock body through the water seepage tank;
The upper rod of the dial indicator is fixed on the supporting frame, and the measuring head of the dial indicator points to the layered rock mass and is used for detecting the vertical displacement of the layered rock mass;
the filter screen is supported at the bottom of the layered rock body and used for rainwater infiltration, and the periphery of the filter screen is connected with the bottom of the simulation box body or the supporting frame; and
And the water collecting tank is arranged below the filter screen and is used for collecting rainwater and exudates.
Further, a plurality of force-applying jacks are uniformly distributed on the top of the layered rock mass.
Further, the force-applying jack is an electric jack.
Further, a plurality of water permeable holes are uniformly formed in the bottom plate, which is in contact with the layered rock mass, of the water permeable box.
Further, the dial indicator is a digital display dial indicator.
Further, the water collecting tank is arranged on the supporting frame in the surrounding mode.
Further, four of the side walls are detachably connected.
Further, a plurality of maintenance lifting jacks are respectively arranged outside the peripheral side walls of the simulation box body, piston rods of the maintenance lifting jacks point to and are perpendicular to the side walls, and bases of the maintenance lifting jacks are connected with the supporting frame.
Further, a dial indicator for measuring horizontal displacement of the layered rock mass is arranged between at least one side wall and the supporting frame.
The bearing capacity detection device for the layered rock mass under rainwater penetration has the beneficial effects that: the bearing capacity of the layered rock body under rainwater infiltration is detected by using the force-applying jack and the rainwater spraying mechanism, the influence of field rainwater on the bearing capacity of the layered rock body is realized by simulating the rainwater infiltration, and the quality of solid rock brought out by infiltration is measured through experiments, so that the quality relation between different compressive strengths and samples after encountering water and soil loss is established, and the basis is provided for field geotechnical engineering construction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a bearing capacity detection device for layered rock mass under rainwater penetration, which is provided by an embodiment of the invention;
fig. 2 is a schematic top view of fig. 1.
Wherein, each reference sign in the figure:
1-a support frame; 2-a water collection tank; 3-layered rock mass; 4, filtering the mixture by a filter screen; 5-dimensional stable jack; 6-percentage table; 7-a water inlet pipe; 8-a seepage tank; 9-applying jack.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2 together, a device for detecting the bearing capacity of a layered rock mass 3 according to the present invention under rainwater penetration will now be described. The bearing capacity detection device for the layered rock mass 3 under rainwater penetration comprises a supporting frame 1, a simulation box body, a rainwater spraying mechanism, a force-applying jack 9, a dial indicator 6, a filter screen 4 and a water collecting tank 2; the simulation box body is arranged in the supporting frame 1 and is provided with at least four side walls which are connected in sequence, and a layered rock mass 3 is arranged in the simulation box body; the rainwater spraying mechanism comprises a seepage tank 8 arranged at the top of the layered rock body 3 and used for seepage to the layered rock body 3, and a water inlet pipe 7 communicated with the seepage tank 8, wherein the water inlet pipe 7 supplies water into the seepage tank 8 by means of a water pump; the base of the force jack 9 is arranged on the supporting frame 1, the piston rod of the force jack points downwards to the water seepage tank 8, and pressure is applied to the layered rock mass 3 through the water seepage tank 8; a dial indicator 6, the upper rod of which is fixed on the supporting frame 1, and the measuring head of which points to the layered rock mass 3 and is used for detecting the vertical displacement of the layered rock mass 3; the filter screen 4 is supported at the bottom of the layered rock body 3 and used for rainwater infiltration, and the periphery of the filter screen 4 is connected with the bottom of the simulation box body or the supporting frame 1; the water collection sump 2 is arranged below the filter screen 4 for collecting rainwater and exudates.
Compared with the prior art, the bearing capacity detection device for the layered rock mass 3 under rainwater infiltration provided by the invention simulates the bearing capacity above the rock mass by means of the force-applied jack 9, realizes the influence of field rainwater on the bearing capacity of the layered rock mass 3 by simulating the rainwater infiltration, and determines the quality of solid rock brought out by infiltration through experiments, thereby establishing the quality relation between different compressive strengths and samples after water and soil loss, and providing basis for field geotechnical engineering construction.
Referring to fig. 1 to 2, as a specific embodiment of the device for detecting the bearing capacity of the layered rock mass 3 under the infiltration of rainwater, a plurality of force-applying jacks 9 uniformly distributed on the top of the layered rock mass 3 are provided. In the test, the applied pressure is changed according to the preset requirement, and the quality of the solid rock penetrated by rainwater under the condition of different bearing capacities is simulated.
In one specific embodiment of the device for detecting the bearing capacity of the layered rock mass 3 under rainwater penetration, a plurality of water permeable holes are uniformly formed in a bottom plate of the water permeable box 8, which is in contact with the layered rock mass 3, and the water permeable holes are not shown in the figure.
Optionally, as a specific implementation mode of the bearing capacity detection device for the layered rock mass 3 under rainwater penetration, the dial indicator 6 is a digital display dial indicator, so that vertical displacement can be observed conveniently at any time.
Referring to fig. 1, as a specific embodiment of the device for detecting the bearing capacity of the layered rock mass 3 under the infiltration of rainwater, according to the present invention, a water collecting tank 2 is mounted on a supporting frame 1, rainwater flows into the water collecting tank 2 from a filter screen 4 through the rock mass, solid rocks carried by the rainwater are also collected into the water collecting tank 2, and the solid in the water collecting tank 2 is dried, so that the quality of the infiltrated object can be obtained.
Referring to fig. 1, as a specific embodiment of the device for detecting the bearing capacity of the layered rock mass 3 under rainwater penetration provided by the present invention, four side walls are detachably connected. The detachable connection mode is a mode of adopting hinge connection, splicing or adopting bolt connection.
Referring to fig. 1, as a specific implementation mode of the bearing capacity detection device for the layered rock mass 3 under rainwater penetration provided by the invention, a plurality of dimension stabilizing jacks 5 are respectively arranged outside the peripheral side walls of the simulation box body, the piston rods of the dimension stabilizing jacks 5 point to and are perpendicular to the side walls, and the base of the dimension stabilizing jacks 5 is connected with the supporting frame 1. The dimensional stabilizing jack 5 provides lateral pressure stabilization, resists the displacement of the rock mass to two sides under the action of the force-applying jack 9, simulates the constraint force around the rock mass and provides a relatively real test environment.
Referring to fig. 1, as a specific embodiment of the device for detecting the bearing capacity of the layered rock mass 3 under the infiltration of rainwater, a dial indicator for measuring the horizontal displacement of the layered rock mass 3 is further disposed between at least one side wall and the supporting frame 1.
The test process for carrying out bearing capacity detection under rainwater infiltration by using the device comprises the following steps:
firstly, assembling a supporting frame 1, and installing a rainwater penetration mechanism, a force-applying jack 9 and a pressure-stabilizing jack;
secondly, placing a proper simulated layered rock mass 3 in the supporting frame 1 according to the actual engineering situation;
thirdly, starting a monitoring system, and automatically reading the percentage rule and the pressure detection system to complete the detection system by adjusting each jack;
And fourthly, changing the size of the jack to obtain the vertical displacement, the horizontal displacement and the quality of the permeated solid rock of the layered rock body 3 under different bearing capacities, and calculating to obtain the relation between the water and soil loss quality and the compressive strength under different stress areas, thereby being applicable to the simulation of the stress condition of the layered rock body 3 under different engineering conditions.
As shown in the table below, the mass m of the solid rock penetrated by the jack F, vertical displacement deltay, horizontal displacement deltax, and various applied forces were measured.
| Applying pressure | F1 | F2 | F3 |
| Horizontal displacement | Δx1 | Δx2 | Δx3 |
| Vertical displacement | Δy1 | Δy2 | Δy3 |
| Rock mass after water and soil loss | m1 | m2 | m3 |
| Compressive Strength | σ1 | σ2 | σ3 |
The calculation formula is as follows:
m1＝m-Δm1
Δm1＝mG×(1+w)
m 2＝m-Δm2, calculating sigma 2 according to the formula;
The pressure of the jack is changed, and the corresponding relation between the soil erosion quality and the compressive strength under different bearing capacities can be obtained.
Wherein: a is the stress area; w is the water content of the simulated layered rock mass; m G is the mass of solids in the sump for drying.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. Bearing capacity detection device for lamellar rock mass under rainwater infiltration, characterized by comprising:
A support frame;
the simulation box body is arranged in the supporting frame and is provided with at least four side walls which are connected in sequence, and a layered rock mass is arranged in the simulation box body;
The rainwater spraying mechanism comprises a water seepage tank arranged at the top of the layered rock body and used for seepage water to the layered rock body and a water inlet pipe communicated with the water seepage tank, and the water inlet pipe supplies water into the water seepage tank by means of a water pump;
the base of the force-applying jack is arranged on the supporting frame, the piston rod of the force-applying jack points downwards to the water seepage tank, and pressure is applied to the layered rock body through the water seepage tank;
The upper rod of the dial indicator is fixed on the supporting frame, and the measuring head of the dial indicator points to the layered rock mass and is used for detecting the vertical displacement of the layered rock mass;
the filter screen is supported at the bottom of the layered rock body and used for rainwater infiltration, and the periphery of the filter screen is connected with the bottom of the simulation box body or the supporting frame; and
The water collecting tank is arranged below the filter screen and is used for collecting rainwater and exudates;
a plurality of stressing jacks uniformly distributed on the top of the layered rock mass are arranged;
and a plurality of water permeable holes are uniformly formed in the bottom plate, which is in contact with the layered rock mass, of the water permeable box.
2. The device for detecting the bearing capacity of a layered rock mass under rainwater penetration according to claim 1, wherein: the force-applying jack is an electric jack.
3. The device for detecting the bearing capacity of a layered rock mass under rainwater penetration according to claim 1, wherein: the dial indicator is a digital display dial indicator.
4. The device for detecting the bearing capacity of a layered rock mass under rainwater penetration according to claim 1, wherein: the water collecting tank is arranged on the supporting frame in the periphery.
5. The device for detecting the bearing capacity of a layered rock mass under rainwater penetration according to claim 1, wherein: four side walls are detachably connected.
6. A load bearing capacity sensing apparatus for layered rock mass under rain penetration as claimed in any one of claims 1 to 5, wherein: the simulation box is characterized in that a plurality of maintenance and stabilization jacks are respectively arranged outside the peripheral side walls of the simulation box body, piston rods of the maintenance and stabilization jacks are directed and perpendicular to the side walls, and bases of the maintenance and stabilization jacks are connected with the supporting frame.
7. The device for detecting the bearing capacity of a layered rock mass under rainwater penetration according to claim 6, wherein: and a dial indicator for measuring the horizontal displacement of the layered rock mass is further arranged between at least one side wall and the supporting frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811555403.7A CN109457683B (en) | 2018-12-19 | 2018-12-19 | Bearing capacity detection device for layered rock mass under rainwater penetration |
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| CN201811555403.7A CN109457683B (en) | 2018-12-19 | 2018-12-19 | Bearing capacity detection device for layered rock mass under rainwater penetration |
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| CN109457683A CN109457683A (en) | 2019-03-12 |
| CN109457683B true CN109457683B (en) | 2024-04-26 |
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