CN110983887A - Construction method for filling roadbed with high liquid limit soil - Google Patents
Construction method for filling roadbed with high liquid limit soil Download PDFInfo
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- CN110983887A CN110983887A CN201911022337.1A CN201911022337A CN110983887A CN 110983887 A CN110983887 A CN 110983887A CN 201911022337 A CN201911022337 A CN 201911022337A CN 110983887 A CN110983887 A CN 110983887A
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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
- 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
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Civil Engineering (AREA)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention discloses a construction method of a high liquid limit soil roadbed, which comprises the steps of firstly measuring and drawing a side line of an excavated square section; then, a catch drain is manufactured at the position 3 m-10 m of the periphery of the sideline to prevent rainwater from flowing into or permeating into the square digging section; drilling a plurality of holes on the excavation section, filling quicklime into the holes, and sealing after filling to absorb water of the high liquid limit soil in the excavation section; then, carrying out closed covering on the surface of the square digging section, and enabling the quick lime to fully absorb moisture after 5-10 days; and finally, excavating and transporting the soil of the excavation section to a filling section of the roadbed, and filling the roadbed layer by layer. The construction method improves the high liquid limit soil before excavating and transporting the high liquid limit soil, reduces the water content, can directly compact the high liquid limit soil during subsequent filling operation, shortens the construction period and improves the construction efficiency.
Description
Technical Field
The invention relates to the technical field of filling roadbeds, in particular to a construction method for filling a roadbed with high liquid limit soil.
Background
High liquid limit soil generally refers to fine grained soil with a liquid limit greater than 50% and a plasticity index greater than 26. The high liquid limit soil has small grain diameter, large capillary water rising height but low rising speed, and mineral components contained in the soil have more negative charges and stronger hydrophilicity, so that the thickness of a soil grain combined water film is larger, and the permeability coefficient is lower. The water content of the high liquid limit soil is not easy to overflow under normal conditions and is difficult to compact. When the soil body with high liquid limit loses water, the soil body shrinks and cracks, the cracking degree of the soil body is increased along with the increase of the content of the clay grains, and the soil body with high liquid limit has great shrinkage characteristics. The strength of the soil consists of cohesive force and friction force between soil particles, the strength of the high liquid limit soil mainly depends on the cohesive force of the soil, and geotechnical tests show that the high liquid limit soil has micro-cohesive force when in a dry state, but is easy to crush; when the high liquid limit soil is in a submerged state, fluid is easily formed, and the overall stability of the high liquid limit soil is poor. The mechanical characteristics of the high liquid limit soil are embodied in engineering as poor water permeability, remarkable capillary phenomenon, strong hydrophilicity, capability of keeping moisture for a long time after soaking, large porosity, small dry density, hard as iron during drying, and difficult compaction after backfilling.
In the process of constructing the highway, firstly, soil mass generated in an excavation section is transported to a waste soil field to be used as abandoned soil, and in the case, a larger waste soil field is needed, and meanwhile, a containment project is needed to prevent the waste soil from collapsing; and secondly, transporting the high liquid limit soil to a filling section for filling operation, but in a geological environment of the high liquid limit soil, if the high liquid limit soil is used as a raw material for roadbed filling work, airing the high liquid limit soil to reduce the water content of the high liquid limit soil to the optimal water content, and then compacting the high liquid limit soil better. The airing needs a large field and time, and particularly during construction in rainy seasons, the moisture content of the high liquid limit soil is difficult to air to the optimal moisture content, so that the construction period is increased seriously.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for constructing a roadbed filled with high liquid limit soil, which can fill the roadbed with high liquid limit soil as a raw material in a geological environment of high liquid limit soil, without requiring additional air-drying work, and shorten the construction period.
In order to achieve the purpose, the invention provides a construction method for filling a roadbed with high liquid limit soil, which is applied to a geological environment with a soil body being high liquid limit soil, and comprises the following steps:
s1: measuring and drawing a side line of the square digging section;
s2: a water intercepting ditch is manufactured at the position 3 m-10 m of the periphery of the sideline to prevent rainwater from flowing into or permeating into the square digging section;
s3: drilling a plurality of holes on the excavation section, filling quicklime into the holes, and sealing after filling to absorb water of high liquid limit soil in the excavation section;
the calculation formula of the number n of the holes is as follows: q (V)1-nπr2L)(w1-w2)ρ1＝ρ2nπr2Wherein r is the radius of the hole; rho1Is the density of water, p2Density of quicklime; w is a1Is the natural water content of the soil, w2The optimal water content of the soil is obtained; q is the weight of quicklime required to absorb unit weight of moisture, wherein q is 3.11; v1The volume of the square digging section is shown, and L is the length of the hole;
s4: covering the surface of the square digging section in a closed manner, and then waiting for 5-10 days to enable the quicklime to fully absorb moisture;
s5: and excavating and transporting the soil of the excavation section to a filling section of the roadbed, and filling the roadbed layer by layer.
Further, the diameter of the hole is within the range of 10cm to 20cm, and the length of the hole is the same as the depth of the square digging section.
Furthermore, the holes are uniformly distributed on the square digging section.
Further, before step S3, first, the volume of the excavation section and the water content of the soil of the excavation section are measured, the weight of quicklime required for reducing the water content of the soil to the optimal water content is calculated, then, the volume of the holes required for containing the quicklime is calculated, and the number of the holes is calculated according to the volume, the diameter of the holes and the length of the holes.
Furthermore, a waterproof layer is arranged on the surface of the intercepting ditch.
Further, the specific process of filling the roadbed in a layered manner in step S5 is as follows: firstly, spreading and leveling the soil to a thickness of 30cm at the filling section, then mixing the soil and checking the water content of the soil, if the water content is not more than the optimal water content, compacting the soil until the compaction degree of the soil reaches a design value, and then carrying out filling work of the next layer of roadbed; and if the water content is larger than the optimal water content, continuously adding quicklime into the soil and mixing until the water content is not larger than the optimal water content.
Further, the quicklime is quicklime powder.
According to the above description and practice, the construction method for filling the roadbed with the high liquid limit soil according to the invention is characterized in that a hole is drilled on the excavation section, and quicklime is filled into the hole, so that part of water in the high liquid limit soil of the excavation section is absorbed. The water content of the high liquid limit soil in the excavation section can be quantitatively absorbed by controlling the number of the holes and the number of the filled quicklime, so that the water content of the high liquid limit soil is reduced to the optimal water content required by compaction, and the subsequent roadbed filling work is facilitated. When roadbed filling is carried out in high liquid limit soil geological environment by the construction method, the high liquid limit soil is not required to be aired by opening up a field, the construction period can be effectively shortened, and the construction efficiency is improved.
Drawings
Figure 1 is a schematic cross-sectional view of a scoop section involved in one embodiment of the present invention.
Figure 2 is a plan view of a scoop section involved in one embodiment of the present invention.
Fig. 3 is a schematic flow chart of a construction method for filling a roadbed with high liquid limit soil according to an embodiment of the invention.
In the figure: 1. digging a square section, 2, intercepting a ditch, 3, a hole, 4 and a plastic film.
Detailed Description
An embodiment of a construction method for filling a roadbed with high liquid limit soil according to the present invention will be described with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.
The construction method of the high liquid limit soil filled roadbed provided by the invention mainly comprises the following steps:
step S1: and measuring and drawing a side line of the square digging section.
Step S2: and manufacturing a water intercepting ditch at the position 3 m-10 m of the periphery of the sideline to prevent rainwater from flowing into or permeating into the square digging section. And a waterproof layer is also arranged on the surface of the intercepting ditch.
Step S3: drilling a plurality of holes on the excavation section, filling quicklime into the holes, and sealing after filling to absorb water of high liquid limit soil in the excavation section. Wherein the diameter of the holes is within the range of 10cm to 20cm, the length of the holes is the same as the depth of the square digging section, and the holes are uniformly distributed on the square digging section. Need calculate before the drilling hole the quantity of hole, at first the measurement dig the volume of side section with the moisture content of excavation section soil, and will the moisture content of soil falls to the required weight of quick lime of best moisture content, later the calculation holds the volume of the required hole of quick lime, according to the volume calculation the quantity of hole is at last the drilling out on the excavation side section the hole of diameter, length and quantity. In addition, in order to enable quick absorption of moisture by quicklime, the quicklime is first pulverized before the quicklime is filled into the hole. The optimum water content is the water content of the soil that can maximize the degree of compaction when the soil is compacted.
In this step, since the length of the hole is the same as the depth of the excavation section, when calculating the number of the holes, it can be calculated on the basis of one cubic meter of the soil that how many holes need to be set per square meter to reduce the water content of one cubic meter of the soil to the optimum water content, at this time, the length of the hole is one meter, and the specific calculation is disclosed as follows:
q(V1-nπr2L)(w1-w2)ρ1＝ρ2nπr2
wherein n is the number of the holes; r is the radius of the hole; rho1Is the density of water, p2Density of quicklime; w is a1Is the natural water content of the soil, w2For the optimal water content of the soil, it should be noted that the water content is the volume water content, that is, the percentage of the volume of water in the soil per unit volume; q is the weight of quicklime required to absorb unit weight of moisture, wherein q is 3.11; v1For the volume of the square-cut section, here V1＝1m3(ii) a L is the length of the hole, where L is 1 m. The number n of the holes required per square meter can be calculated through the formula, and finally the holes are drilled on the surface of the excavation section according to the rule of n holes per square meter.
Step S4: and covering the surface of the square digging section in a closed manner, and then waiting for 5-10 days to enable the quick lime to fully absorb moisture to generate slaked lime.
Step S5: and excavating and transporting the soil of the excavation section to a filling section of the roadbed, and filling the roadbed layer by layer. Firstly, spreading and leveling the soil to a thickness of 30cm in the filling section, then mixing the soil and checking the water content of the soil, if the water content is not more than the optimal water content, compacting the soil until the compaction degree of the soil reaches a design value, and then carrying out the filling work of the next layer; and if the water content is larger than the optimal water content, continuously adding quicklime into the soil and mixing until the water content is not larger than the optimal water content. The quicklime added in the method can also be quicklime powder, so that the absorption of the quicklime powder to water can be accelerated.
The construction method is explained below with reference to a certain highway engineering, the highway is located in a mountain area, the construction site is narrow, most of soil bodies are high liquid limit soil, the natural water content of the high liquid limit soil in the site is measured to be 23%, if the high liquid limit soil is compacted, the optimal water content is 15%, and the water content in the site is volume water content. Because of the lack of land resources in mountainous areas, the earthwork required by roadbed filling selects nearby high liquid limit soil.
Fig. 1 is a schematic sectional view of a block, from which soil required for roadbed filling is excavated, according to an embodiment of the present invention. Figure 2 is a plan view of a scoop section involved in one embodiment of the present invention. Fig. 3 is a schematic flow chart of a construction method for filling a roadbed with high liquid limit soil according to an embodiment of the invention.
Referring to fig. 1 to 3, the specific construction steps of the construction method for filling the roadbed with the high liquid limit soil in the embodiment are as follows:
step 1: the edge line of the square digging section 1 is measured and drawn.
Step 2: and manufacturing a intercepting ditch 2 at a position 5m away from the periphery of the sideline to prevent rainwater from flowing into or permeating into the digging square section, and paving a cement felt on the surface of the intercepting ditch 2 to prevent rainwater from permeating downwards.
And step 3: and calculating the number of holes filled with quicklime powder in one cubic meter of soil to reduce the water content of the soil to the optimal water content. In this embodiment, the radius of the holes is 0.05 m. According to the formula q (V)1-nπr2L)(w1-w2)ρ1＝ρ2nπr2The number n of the holes can be calculated, in this embodiment, r is the radius of the holes, and r is 0.05 m; rho1Is the density of water, p2Density of quicklime, p1＝1t/m3，ρ2＝3.3t/m3；w1Is the natural water content of the soil, w2For the optimum moisture content of the soil to be compacted, it should be noted that the moisture contents are all volumetric moisture contents, where w1＝23％，w215 percent; q is the weight of quicklime required to absorb unit weight of moisture, wherein q is 3.11; v1For the volume of the square-cut section, here V1＝1m3(ii) a L is the length of the hole, whichWhere L is 1 m. Substituting the known parameters into the formula q (V)1-nπr2L)(w1-w2)ρ1＝ρ2nπr2The method is characterized in that n is 8.92, an integer n is 9, that is, 9 holes with the radius of 0.05m and the length of 1m are required to be arranged in each cubic meter, and quicklime powder is filled in the holes to reduce the water content of the remaining soil in the cube to the optimal water content, and it is noted that the holes are required to be filled with quicklime powder, the weight of the quicklime powder is slightly larger than the theoretically required weight, because the water of the soil adjacent to the excavation section can permeate into the excavation section, the weight of the added lime powder is slightly larger than the theoretically required weight, and the water content of the soil is required to be detected in the subsequent roadbed filling process to ensure that the water content is close to the optimal water content.
Correspondingly, if the water content of the soil in the excavation section is reduced to the optimal water content, a plurality of holes 3 need to be drilled downwards uniformly on the surface of the excavation section according to the rule of 9 holes per square meter, the length of each hole 3 is equal to the depth of the excavation section, quicklime powder is filled in each hole 3, clay is used for sealing after filling is finished, and in addition, the quicklime powder fully absorbs the water of the high-liquid limit soil in the excavation section 1, so that the water content of the soil is reduced to the position near 15% of the optimal water content.
And 4, step 4: the surface of the excavation section 1 is covered in a closed manner, a plastic film 4 can be used for covering the surface of the excavation section 1, the end part of the plastic film 4 needs to cover the side edge of the intercepting ditch 2, and the plastic films 4 can be bonded by adopting a waterproof adhesive tape, so that the surface of the excavation section 1 is isolated from the outside, and external moisture is prevented from entering the excavation section 1. And waiting for one week to make the quicklime fully absorb water to generate slaked lime.
And 5: and excavating and transporting the soil of the excavation section 1 to a filling section of the roadbed, and filling the roadbed layer by layer. Spreading and leveling the soil to a thickness of 30cm in the filling section, mixing the soil by using a road mixer, detecting the water content of the soil, compacting the soil by using a road roller if the water content is not more than the optimal water content until the compaction degree of the soil reaches a design value, and then carrying out the next layer of roadbedAnd (5) filling, namely placing soil with the thickness of 30cm when each layer of roadbed is filled, and compacting until the thickness of the roadbed reaches a design value. If the water content of the soil is still larger than the optimal water content after mixing, continuously adding a proper amount of quicklime into the soil and mixing until the water content is not larger than the optimal water content, wherein the weight of the added quicklime is Q, the numerical value of the added quicklime is calculated according to the water content of the soil at that time, and the specific calculation formula is Q-qV (w)3-w2)ρ1In the formula w3Is the current water content of the soil, w2For the optimum water content, w, of the soil to be compacted215%, the water content here is also the volume water content; rho1Is the density of water, p1＝1t/m3(ii) a q is the weight of quicklime required for absorbing unit weight of water, and q is 3.11; v is the volume of the layer of soil.
In the construction method for filling the roadbed with the high liquid limit soil, the hole is drilled on the excavation section, and quicklime is filled in the hole, so that part of water in the high liquid limit soil of the excavation section is absorbed. The water content of the high liquid limit soil in the excavation section can be quantitatively absorbed by controlling the number of the holes and the number of the filled quicklime, so that the water content of the high liquid limit soil is reduced to the optimal water content required by compaction, and the subsequent roadbed filling work is facilitated.
The construction method of the high liquid limit soil filled roadbed according to the present invention is described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications can be made to the construction method for filling the roadbed with the high liquid limit soil provided by the invention without departing from the content of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (7)
1. A construction method for filling a roadbed by high liquid limit soil is applied to a geological environment in which a soil body is high liquid limit soil, and is characterized by comprising the following steps:
s1: measuring and drawing a side line of the square digging section;
s2: a water intercepting ditch is manufactured at the position 3 m-10 m of the periphery of the sideline to prevent rainwater from flowing into or permeating into the square digging section;
s3: drilling a plurality of holes on the excavation section, filling quicklime into the holes, and sealing after filling to absorb water of high liquid limit soil in the excavation section;
the calculation formula of the number n of the holes is as follows: q (V)1-nπr2L)(w1-w2)ρ1＝ρ2nπr2Wherein r is the radius of the hole; rho1Is the density of water, p2Density of quicklime; w is a1Is the natural water content of the soil, w2The optimal water content of the soil is obtained; q is the weight of quicklime required to absorb unit weight of moisture, wherein q is 3.11; v1The volume of the square digging section is shown, and L is the length of the hole;
s4: covering the surface of the square digging section in a closed manner, and then waiting for 5-10 days to enable the quicklime to fully absorb moisture;
s5: and excavating and transporting the soil of the excavation section to a filling section of the roadbed, and filling the roadbed layer by layer.
2. The method of constructing a high liquid limit soil-filled roadbed of claim 1, wherein the diameter of the hole is in the range of 10cm to 20cm, and the length of the hole is the same as the depth of the excavation section.
3. The method of constructing a high liquid limit soil filled subgrade according to claim 2, wherein said holes are uniformly distributed on said excavated section.
4. The method of constructing a high liquid limit soil filled roadbed of claim 3, wherein before the step S3, the volume of the excavation section and the water content of the excavation section soil are measured, the weight of quicklime required for reducing the water content of the soil to an optimal water content is calculated, then the volume of the holes required for containing the quicklime is calculated, and the number of the holes is calculated according to the volume and the diameter and length of the holes.
5. The construction method of a high liquid limit soil filled roadbed according to claim 1, wherein a waterproof layer is provided on the surface of the intercepting drain.
6. The method for constructing a high liquid limit soil filled roadbed according to claim 1, wherein the concrete process of filling the roadbed in a layered manner in the step S5 is as follows: firstly, spreading and leveling the soil to a thickness of 30cm at the filling section, then mixing the soil and checking the water content of the soil, if the water content is not more than the optimal water content, compacting the soil until the compaction degree of the soil reaches a design value, and then carrying out filling work of the next layer of roadbed; and if the water content is larger than the optimal water content, continuously adding quicklime into the soil and mixing until the water content is not larger than the optimal water content.
7. The construction method for a high liquid limit soil filled roadbed according to any one of claims 1 to 6, wherein the quicklime is quicklime powder.
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| CN1326033A (en) * | 2000-05-25 | 2001-12-12 | 关伟伯 | Soil compacting method and its special machine and tool |
| EP1630143A1 (en) * | 2003-06-09 | 2006-03-01 | Nippon Steel Corporation | Method for stabilization treatment of steel making slag, stabilized steel making slag, and material and method for environmental preservation of water area using said slag |
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