CN112626950B - Treatment method for karst roadbed by combining soil arch effect - Google Patents
Treatment method for karst roadbed by combining soil arch effect Download PDFInfo
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- CN112626950B CN112626950B CN202011332349.7A CN202011332349A CN112626950B CN 112626950 B CN112626950 B CN 112626950B CN 202011332349 A CN202011332349 A CN 202011332349A CN 112626950 B CN112626950 B CN 112626950B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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Abstract
The invention discloses a disposal method for a karst roadbed by combining a soil arch effect, which comprises the following steps: establishing an engineering geological model of the subgrade in the karst field area; setting boundaries and loads in the engineering geological model; analyzing the deformation condition of the engineering geological model to obtain a serious deformation area of the subgrade of the karst field area; and (4) carrying out encryption processing on the severely deformed area to form a soil arch effect.
Description
Technical Field
The invention belongs to the technical field of treatment of karst subgrades, and particularly relates to a treatment method of a karst subgrade by combining a soil arch effect.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, karst of some regional areas develops, and karst subgrade sections are numerous; the upper covering layer of the on-site karst roadbed is a soil layer, the karst on the lower part is a beaded karst cave, the overall karst cave is large, potential safety hazards exist in the stabilization of the upper roadbed, the conventional grouting treatment or composite roadbed treatment is difficult to treat to the bottom of the karst cave, the potential safety hazards cannot be treated positively, the construction cost is high, and an economical, reasonable and effective treatment method is urgently needed for the situation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a disposal method for a karst roadbed by combining a soil arch effect, which solves the problems that an upper covering layer is a soil layer, a lower karst is a beaded karst cave, the karst roadbed with a large overall karst cave is difficult to treat and high in treatment cost, and greatly shortens the treatment time.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for treating a karst subgrade in combination with an earth arch effect, including the following steps:
establishing an engineering geological model of the subgrade in the karst field area;
setting boundaries and loads in the engineering geological model;
analyzing the deformation condition of the engineering geological model to obtain a serious deformation area of the subgrade of the karst field area;
and (4) carrying out encryption processing on the severely deformed area to form a soil arch effect.
As a further technical scheme, the engineering geological model is established in the following steps:
and determining the range of the karst field for constructing the numerical model, carrying out geophysical prospecting and drilling on the range of the karst field, determining the field karst condition, and further establishing the engineering geological model of the subgrade of the karst field.
As a further technical scheme, the field karst condition comprises the distribution of karst caves, the size of the cave diameter and the filling condition in the cave.
As a further technical scheme, a multi-layer distributed stratum model is established according to the stratum distribution condition, and the boundary between adjacent stratums is set to be straight or inclined; and setting a karst cave model at a corresponding position of the stratum model according to the distribution position and size of the karst cave.
As a further technical scheme, the boundaries of the left side and the right side of the engineering geological model adopt horizontal fixed boundaries, the boundary of the lower part of the model adopts a fixed boundary, and the karst cave free surface is a free boundary.
As a further technical solution, the applied load is: traffic simulation loads are adopted at the upper boundary of the model.
As a further technical scheme, the analysis process of the deformation condition comprises the following steps:
and drawing a ground surface deformation curve by using the ground surface displacement data, the horizontal distance of the model as a horizontal coordinate and the displacement as a vertical coordinate to obtain a serious deformation area of the subgrade in the karst field.
As a further technical scheme, the serious deformation area of the subgrade in the karst field is right above the position of the karst cave, and the earth surface deformation at the central position of the karst cave is the largest.
As a further technical scheme, the soil body above the karst field roadbed karst cave is subjected to high-pressure grouting and encryption treatment, the compaction effect on the upper soil body is achieved, gaps among the soil bodies are compressed, the bearing capacity of the soil body is improved, and a soil arch effect is formed.
As a further technical scheme, a high-pressure jet grouting pile is adopted to carry out grouting and encryption treatment on the soil body.
The embodiment of the invention has the following beneficial effects:
the invention relates to a disposal method of a karst roadbed by utilizing a soil arch effect, which solves the problems that an upper covering layer is a soil layer, a lower karst is a beaded karst cave, and the karst roadbed with a larger total karst cave has high treatment difficulty and high treatment cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic representation of an engineered geology and boundary conditions in accordance with one or more embodiments of the present invention;
FIG. 2a is a schematic representation of one type of cavern surface deformation of untreated foundation according to one or more embodiments of the present disclosure;
FIG. 2b is a schematic representation of another type of cavern surface deformation of an untreated foundation according to one or more embodiments of the present disclosure;
FIG. 3a is a schematic representation of one type of cavern earth surface deformation after foundation treatment in accordance with one or more embodiments of the present disclosure;
FIG. 3b is a schematic representation of another type of cavern earth surface deformation after foundation treatment in accordance with one or more embodiments of the present disclosure;
FIG. 4 is a comparison of the deformation curves of the ground before and after the treatment of the ground;
fig. 5 is a schematic flow diagram of a method of disposal of a karst subgrade according to one or more embodiments of the invention;
in the figure: the spacing or size between each other is exaggerated to show the location of the locations, and the illustration is for illustrative purposes only.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention should be understood broadly, and for example, the terms "mounted", "connected", "fixed", and the like may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically, electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the specific meaning of the terms in the present invention can be understood by those skilled in the art according to specific situations.
As described in the background of the invention, the prior art has shortcomings, and in order to solve the technical problems, the invention provides a method for treating a karst roadbed by combining the soil arching effect.
In an exemplary embodiment of the present invention, as shown in fig. 5, a method for treating a karst subgrade by combining an earth arch effect is provided, which specifically includes the following steps:
step 1: establishing an engineering geological model of the subgrade in the karst field area;
and determining the range of the karst field for constructing the numerical model, carrying out geophysical prospecting and drilling on the range of the karst field, determining the field karst condition, and further establishing the engineering geological model of the subgrade of the karst field.
The determined field karst conditions comprise the distribution of karst caves, the size of the cave diameter, the filling condition in the cave and the like.
According to the surveyed field karst condition, establishing an engineering geological model matched with the field karst condition: according to the distribution condition of the in-situ strata, a multi-layer distributed stratum model is established, and the boundary between the adjacent strata is set to be straight or inclined; and setting a karst cave model at a corresponding position of the stratum model according to the distribution position and size of the site karst caves.
As shown in fig. 1, which shows an example of the geological condition of the field karst engineering, in the view of the field karst condition, the lower part is a bedrock, the upper part is a soil layer, an inclined boundary is arranged between the bedrock and the soil layer, the upper soil layer is provided with a karst cave, the boundary between the soil layer and the bedrock is provided with a karst cave, and the size of the karst cave at the boundary is larger than that of the karst cave at the upper soil layer; when the engineering geological model is established, the lower part of the model is set as bedrock, the upper part of the model is set as a soil layer, and a matched karst cave model is arranged in the model according to the position and the size of the karst cave.
Step 2: setting boundaries and loads in the engineering geological model;
the analysis adopts a solid mechanics module in finite element numerical analysis software and matches a Mokolun rule, applies boundary conditions to the engineering geological model, and applies load to the engineering geological model.
The boundary conditions applied are: the left and right side boundaries of the model adopt horizontal fixed boundaries, the lower boundary of the model adopts a fixed boundary, and the karst cave free surface is a free boundary.
The applied loads were: traffic simulation loads are adopted at the upper boundary of the model.
After the boundary condition is applied, the deformation condition of the roadbed under the load action can be obtained by solving a partial differential equation.
The specific partial differential equation is as follows:
S＝S ad +C：∈el，∈ el ＝∈-∈ inel
∈ inel ＝∈ 0 +∈ ext +∈ th +∈ hs +∈ pl +∈ cr +∈ vp
S ad ＝S 0 +S ext +S q
C＝C(E,v)
as in fig. 1, the boundary conditions imposed by the model are represented. In the embodiment, the model is 320 meters long and 40 meters deep, and in the process of analyzing the engineering geological model, the lower boundary adopts a fixed boundary, namely the position is not displaced in the horizontal direction and the vertical direction; the left and right boundaries adopt a horizontal fixed boundary, namely only vertical displacement is generated at the position, and the displacement in the horizontal direction is 0; the upper boundary adopts traffic simulation load, and the karst cave free surface is a free boundary.
And step 3: analyzing the deformation condition of the engineering geological model of the subgrade in the karst field area by adopting finite element numerical analysis software, and further obtaining the deformation condition of the subgrade;
and analyzing the deformation condition of the untreated karst foundation by adopting COMSOL software simulation in combination with field settlement observation.
Analysis shows that the deformation of the subgrade in the karst field area is right above the position of the karst cave, and the ground surface deformation at the central position of the karst cave is the largest.
And drawing a ground surface deformation curve by using the ground surface displacement data (namely the displacement data of the upper boundary of the model) and the horizontal distance of the model as an abscissa and the displacement as an ordinate, so as to obtain a severe deformation area of the subgrade of the karst field area.
During specific selection, the deformation is selected according to whether the deformation exceeds a set range, and if the deformation exceeds the set range, the deformation is a serious deformation area.
Fig. 2a and 2b show two types of karst cave ground surface deformation conditions before foundation treatment. It can be seen from the figure that under the load condition, the deformation of the foundation mainly occurs right above the two karst caves, the ground surface deformation amount at the central position of the karst cave is the largest, the deformation at other positions mainly takes the compression of the upper soil layer as the main part, and the thicker the soil layer, the larger the deformation amount of the foundation is. And extracting earth surface displacement data from the model, and drawing an earth surface deformation curve by taking the horizontal distance of the model as a horizontal coordinate and the displacement as a vertical coordinate.
And 4, step 4: processing the serious deformation area;
according to the analysis of the deformation condition of the roadbed of the engineering geological model, the serious deformation region of the roadbed of the karst field region is positioned right above the position of the karst cave, and the deformation of the lower part of the roadbed and the region far away from the karst cave is smaller.
For the position above a karst field roadbed karst cave, a high-pressure jet grouting pile is adopted to carry out encryption treatment on soil bodies of the karst field roadbed karst cave, the treatment range does not contact the bottom of the karst cave, only high-pressure grouting is carried out on the upper part of the karst cave, the compaction effect is carried out on the upper soil bodies, gaps among the soil bodies are compressed, the bearing capacity of the soil bodies is improved, the soil arch effect is formed, the upper load can be still borne under the condition that the lower karst cave is a cavity or a weak interlayer, and the stability is achieved.
The high-pressure jet grouting pile processing mode adopted by the invention has obvious compaction effect on the soil layer with silty clay-sandwiched broken stones through lateral pressure in the pressure grouting process, and has the best effect on processing the problems and the soil arching effect.
During concrete processing, geological drilling and geophysical prospecting can be combined, a road section with a thin upper covering layer and a soil or broken rock body as a top plate is found out, the processing depth is determined through indoor tests and in-situ tests, the covering layer in the processing depth range is compacted, a high-pressure jet grouting pile is suitable in the hole forming process for a stratum mainly containing silty clay clamped broken stones, and the pressure grouting has an obvious compaction effect on lateral soil layers.
The existing disposal mode of the high-pressure jet grouting pile must be disposed to the bottom of a karst cave, the disposal length is long, and the grouting amount is difficult to control. And this application is based on soil arch effect theory, and the hole treatment is filled in shallow layer encryption slip casting, and high pressure slip casting is crowded dense topsoil layer, increases topsoil layer's bearing capacity, satisfies the upper portion load requirement under the lower soil layer is cavity or weak intermediate layer's the condition.
In this embodiment, the processing depth is 13 meters, which is far less than the actual depth of the hole bottom by 45 meters. The processing effect is shown in fig. 3a and fig. 3b, which show two types of karst cave ground surface deformation after foundation processing.
It can be seen from the figure that, at the position where no karst cave develops, before the high-pressure jet grouting pile is treated, the deformation of the foundation is mainly the compression of the upper soil layer, and the trend that the thicker the upper soil layer is, the larger the deformation of the foundation is shown, the deformation amount before the treatment is large, and the deformation requirement under load is not met. But the earth surface displacement after the treatment is obviously smaller than the earth surface displacement before the treatment, which shows that the earth surface deformation can be reduced by adopting the high-pressure jet grouting pile to treat the foundation even at the position without karst cave development. The deformation after treatment is obviously reduced, and the deformation requirement under the same load is met. In the position where the karst cave develops, the deformation of the earth surface shows obviously different change trends before and after the treatment. Before treatment, the displacement of the earth surface is suddenly increased at a position close to the development position of the karst cave, and the larger the volume of the karst cave is, the larger the deformation of the earth surface is. And the deformation of the karst cave development position of the foundation treated by the high-pressure jet grouting piles is basically consistent with that of the periphery of the karst cave, and the phenomenon of sudden increase is not shown, so that the condition of deformation of the ground surface of the karst cave development area can be obviously improved by treating the foundation by the high-pressure jet grouting piles.
The disposal method for the karst roadbed solves the problems of high treatment difficulty and high treatment cost, greatly shortens the treatment time, greatly saves the construction cost, avoids unnecessary waste and brings considerable social and economic benefits. Reference is made to similar items.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A disposal method for a karst roadbed by combining a soil arch effect is characterized by comprising the following steps:
establishing an engineering geological model of the subgrade in the karst field area;
setting boundaries and loads in the engineering geological model;
analyzing the deformation condition of the engineering geological model to obtain a serious deformation area of the subgrade of the karst field area;
carrying out encryption processing on the severely deformed area to form a soil arch effect;
for the position above a karst field roadbed karst cave, carrying out high-pressure grouting and encryption treatment on soil bodies of the karst field roadbed karst cave, compacting the upper soil bodies, compressing gaps among the soil bodies, improving the bearing capacity of the soil bodies and forming a soil arch effect;
and (4) grouting and encrypting the soil body by adopting the high-pressure jet grouting pile.
2. The method for disposing karst subgrade as claimed in claim 1, wherein the engineering geological model is established by the following steps:
and determining the range of the karst field for constructing the numerical model, carrying out geophysical prospecting and drilling on the range of the karst field, determining the field karst condition, and further establishing the engineering geological model of the subgrade of the karst field.
3. The method as claimed in claim 2, wherein the on-site karst conditions include distribution of karst caves, hole diameter size, and filling conditions in the caves.
4. The method according to claim 2, wherein a multi-layered stratum model is created according to the distribution of the stratum, and the boundary between the adjacent strata is set to be straight or inclined; and setting a karst cave model at a corresponding position of the stratum model according to the distribution position and size of the karst cave.
5. The method as claimed in claim 1, wherein the engineering geological model adopts horizontal fixed boundaries for left and right boundaries, fixed boundaries for lower boundaries, and free boundaries for karst cave free surfaces.
6. A method of treating a karst subgrade according to claim 1, in which the loads applied are: traffic simulation loads are adopted at the upper boundary of the model.
7. A method of treating a karst subgrade according to claim 1, in which the deformation is analyzed by:
and drawing a ground surface deformation curve by using the ground surface displacement data, the horizontal distance of the model as a horizontal coordinate and the displacement as a vertical coordinate to obtain a serious deformation area of the subgrade in the karst field.
8. The method for disposing the karst subgrade as claimed in claim 7, wherein the severe deformation zone of the subgrade in the karst region is right above the position of the karst cave, and the surface deformation at the central position of the karst cave is the largest.
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| CN105297736B (en) * | 2015-10-13 | 2017-05-03 | 长安大学 | Sequential deepening grouting construction technology and device for soil covering layer on karst cave in karst area |
| CN107178077B (en) * | 2016-03-10 | 2019-12-10 | 江西省交通科学研究院 | karst area karst cave overburden grouting reinforcement structure and design method thereof |
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