CN111395303A - Horizontal arrangement method for draining water and discharging salt of soft foundation of saline soil - Google Patents

Horizontal arrangement method for draining water and discharging salt of soft foundation of saline soil Download PDF

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CN111395303A
CN111395303A CN202010205005.3A CN202010205005A CN111395303A CN 111395303 A CN111395303 A CN 111395303A CN 202010205005 A CN202010205005 A CN 202010205005A CN 111395303 A CN111395303 A CN 111395303A
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drainage
diameter
well
plastic drainage
sand well
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CN111395303B (en
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何斌
兰宇杰
常洪林
王婕
马富丽
韩鹏举
白晓红
秦鹏举
靳瑾
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Taiyuan University of Technology
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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
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • 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
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates

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  • Life Sciences & Earth Sciences (AREA)
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  • Environmental & Geological Engineering (AREA)
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  • Mining & Mineral Resources (AREA)
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  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The invention discloses a novel horizontal arrangement method for draining water and salt, which is a vertical drainage channel for horizontally arranging a vertical drainage body according to a regular hexagon and combining the vertical drainage body with a plastic drainage belt when a bagged sand well is adopted by a drainage consolidation method. And the influence circle diameter of the bagged sand well is provided when the bagged sand well is arranged according to the regular hexagon
Figure DEST_PATH_IMAGE001
The center distance between the sand pit and the bagged sand well
Figure 732281DEST_PATH_IMAGE002
The relational formula of (c). The invention provides a novel horizontal arrangement scheme and a relation formula for the drainage and salt discharge of the salinized soil soft soil foundation, so that salt and water are more fully discharged, the application range of a vertical drainage channel can be enlarged, the drainage and reinforcement effect of the salinized soil soft soil foundation can be improved, the post-construction settlement is reduced, and the engineering quality is improved.

Description

Horizontal arrangement method for draining water and discharging salt of soft foundation of saline soil
Technical Field
The invention relates to the technical field of draining and salt discharging of soft bases of saline soil, in particular to a horizontal arrangement method for novel draining and salt discharging of soft bases of saline soil.
Background
The salinized soil is a general term of salinized soil and alkaline earth and various salinized and alkalized soils. The salt in the saline soil is derived from mineral weathering, rainfall, salt rock, irrigation water, ground water and human activities. The saline soil can not only obstruct the growth of plants, but also produce great adverse effects on the building engineering when used as engineering soil, for example, the salt swelling can cause uneven settlement of the foundation. In engineering, the rock soil with the content of the soluble salt being more than 0.3 percent and the engineering characteristics of solution sink, salt expansion, corrosion and the like is judged as the saline soil. And if the salt content of the soil is high, the property of the soil is easy to change, strong corrosion can be caused to steel buried in the ground surface, and the bearing capacity of the foundation is also unstable. The saline soil brings many problems to the infrastructure of China. The soft soil foundation has large water content, loose soil, slow strength increase and large unpredictability, and quality accidents can be caused by slight negligence, so the method is very important for the treatment of the early-stage soil of the soft foundation of the saline soil, and the key lies in the drainage and salt discharge of the soil.
In order to reduce the influence of salt content on the building engineering and have a natural law that salt comes with water and salt goes with water, drainage is a measure for effectively reducing the salt content of soil. The drainage consolidation method is used for consolidating the foundation, namely, the prepressing load is applied to the foundation, so that the pore water in the soil body of the soft clay foundation is discharged, the soil body is subjected to drainage consolidation, the pore volume of the soil body is reduced, the shear strength is improved, and the purposes of reducing the settlement of the foundation after construction and improving the bearing capacity of the foundation are achieved. The vertical drainage channel for drainage consolidation is usually provided with a bagged sand well and a plastic drainage belt. The bagged sand well and the plastic drainage belt have the same reinforcing mechanism, and have the characteristics of quick drainage, quick construction and the like, wherein the construction of the bagged sand well is simple, and the bagged sand well is particularly suitable for the foundation reinforcing engineering limited by the disturbance condition around, but the plastic drainage belt method can be produced in a factory and is suitable for deep soft soil foundations and sand-deficient soft foundation zones.
Disclosure of Invention
In order to fully drain water and salt, improve the application range of the vertical drainage channel, improve the reinforcement effect of a soil body and reduce post-construction settlement, the invention provides a novel vertical drainage channel which combines a bagged sand well and a plastic drainage belt according to a regular hexagon horizontal arrangement scheme, and provides a corresponding relation formula, and the novel vertical drainage horizontal design scheme is applied to a salinized soil soft soil foundation.
The invention is realized by adopting the following technical scheme:
a horizontal arrangement method for draining water and salt in soft foundation of saline soil is characterized by deducing the original plane design formula of vertical drainage body by drainage consolidation method, assuming that the influence range of a bagged sand well is a regular pattern, making its area equal to the actual influence range, and deducing the formula, namely the influence circle diameter d of the vertical drainage body sand welleThe relation with the center distance l of the drainage body; the method specifically comprises the following steps:
(1) the bagged sand well is arranged according to the regular hexagon, the influence range of one sand well is assumed to be a regular triangle, the actual influence range is a circle, the side length of the regular triangle is equal to the central distance of the sand well and is l, and two sides of the regular triangle are perpendicular to the regular hexagon, so that the area of the regular triangle is equal to the area of the influence circle.
(2) Let the triangle have an area S1：
Figure BDA0002420804170000021
Setting round noodlesProduct of S2:
Figure BDA0002420804170000022
Calculating the ratio of l to the diameter deThe relationship is as follows: s1＝S2
Figure BDA0002420804170000031
Figure BDA0002420804170000032
(3) The bagged sand well is arranged according to the regular hexagon, and partial areas which are not in the range of the influence circle are drained by adopting the plastic drainage belt, so that the bagged sand well is combined with the plastic drainage belt; according to the diameter d of the sand wellwWhen the diameter of the well is 15 mm, drawing a graph, drawing a range for arranging the plastic drainage belt, and measuring the width b of the plastic drainage belt to be 369 mm; according to the diameter d of the sand wellwWhen the diameter of the well is 30 mm, drawing a graph, drawing a range for arranging the plastic drainage belt, and measuring the width b of the plastic drainage belt to be 1054 mm; the width of the plastic drainage belt meets the requirements of the dimension and quality standard of the section of the plastic drainage belt, namely the width is more than 95 mm; taking a plastic drainage belt with the minimum thickness requirement of 4 mm;
the formula of the equivalent diameter of the plastic drainage belt is as follows:
Figure BDA0002420804170000033
Figure DEST_PATH_1
therefore, the thickness of the plastic drainage strip is increased, and the requirement that the thickness is more than 4mm is met.
(4) And calculating the water flow of the vertical drainage body.
A water passing formula of the sand well;
Figure BDA0002420804170000035
qw-is the displacement per unit time under a hydraulic gradient;
Kw-vertical drainage permeability coefficient;
dw-diameter of sand well.
The invention is similar to the arrangement mode of equilateral triangle and square, and the bagged sand wells are arranged according to the regular hexagon arrangement mode; deducing influence circle diameter d of vertical drainage body sand well when bagged sand wells are arranged according to regular hexagoneThe relation with the center distance l of the drainage body; when the bagged sand wells are arranged according to the regular six deformation, assuming that the influence range of one sand well is a regular triangle and the actual influence range is a circle, so that the areas of the sand well and the actual influence range are approximately equal, pushing out a formula, and determining the range of the central distance l of the drainage body according to the diameter of the sand well and the diameter ratio of the sand well; the drainage areas which are not involved when the bagged sand wells are arranged according to the regular hexagon are subjected to supplementary drainage by using the plastic drainage belts, and the bagged sand wells are combined with the plastic drainage belts, so that water and salt can be fully discharged, and the soil body is subjected to drainage consolidation.
Compared with the two existing arrangement modes, the invention combines the two original arrangement modes, can remove underground water in a certain range to the maximum extent, and can effectively improve the effects of draining water and salt. The regular hexagon can be seen as a combination of two triangles and a rectangle, and is a novel horizontal arrangement scheme for draining water and salt. According to the hypothesis that the bagged sand wells influence the diameter d of the circle when arranged in a regular hexagoneThe relation with the center distance l of the drainage body; when the water in the peripheral soil body can not be fully discharged, the plastic drainage belt is adopted for drainage, so that the bagged sand well and the plastic drainage belt are combined for drainage and salt drainage. The diameter and the spacing of the sand wells are suitable for ensuring smooth drainage and the shortest path, and according to consolidation theory and engineering practice, the effect of accelerating consolidation is better when the spacing of the sand wells is shortened than when the diameter of the sand wells is increased, namely, the relationship between the well diameter and the spacing is 'thin and dense' rather than 'thick and thin'. However, the finer the sand, the denser the sand, the better the consolidation effect, the too fine sand cannot ensure the compactness and continuity of the sand filling, and the too dense sand has larger disturbance to the surrounding soil to reduce the strength and permeability of the soil, but affects the consolidation effect. The inventionThe calculated range of the drainage center distance l also meets the requirement, the section size of the plastic drainage belt also meets the standard requirement, and the fact that the drainage quantity of the novel drainage and salt discharge horizontal arrangement scheme is larger than that of the original horizontal arrangement scheme is proved to enable the soil body to achieve a good drainage consolidation effect.
The invention adopts a novel horizontal arrangement scheme for water drainage and salt drainage, enlarges the application range of the vertical water drainage channel, increases the water drainage amount, can improve the reinforcement effect of the soft soil foundation of the saline soil, reduces the post-construction settlement and improves the engineering quality.
The invention has reasonable design and very good practical application value.
Drawings
FIG. 1 shows that when the bagged sand wells are arranged in a regular triangle, the diameter d of the bagged sand well is taken within the diameter range of 70-100 mmwIs 70 mm; the hole diameter ratio is 15-30 within the range of the hole diameter ratio n of the bagged sand well, namely the influence circle diameter deDiameter d of sand wellwRatio of
Figure BDA0002420804170000051
Find de1050mm, substituting deAnd a schematic plan design drawing in which the distance l between the centers of drainage determined as 1.05l is the smallest and 1000mm, and the calculated data is plotted.
FIG. 2 shows the diameter d of the bagged sand well within the range of 70-100 mm when the bagged sand wells are arranged in a regular trianglewIs 100 mm; the hole diameter ratio is 30 when the hole diameter ratio range n is 15-30, namely the influence circle diameter deDiameter d of sand wellwRatio of
Figure BDA0002420804170000052
Find de3000mm, substituting deThe maximum distance l between the centers of drainage was found to be 2860mm at 1.05l, and a schematic plan view was drawn based on the calculated data.
FIG. 3 shows the diameter d of the bagged sand well within the range of 70-100 mm when the bagged sand wells are arranged in a square shapewIs 70 mm; the hole diameter ratio is 15-30 within the range of the hole diameter ratio n of the bagged sand well, namely the influence circle diameter deDiameter d of sand wellwRatio of
Figure BDA0002420804170000053
Find de1050mm, substituting deThe minimum center distance l of drainage obtained as 1.13l was 929mm, and a schematic plan view was drawn based on the calculated data.
FIG. 4 shows the diameter d of the bagged sand well within the range of 70-100 mm when the bagged sand wells are arranged in a square shapewIs 100 mm; the hole diameter ratio is 30 when the hole diameter ratio range n is 15-30, namely the influence circle diameter deDiameter d of sand wellwRatio of
Figure BDA0002420804170000061
Find de3000mm, substituting deThe maximum distance l between the centers of drainage obtained at 1.13l was 929mm, and a schematic plan view was drawn based on the calculated data.
FIG. 5 shows the diameter d of the bagged sand well within the range of 70-100 mm when the bagged sand wells are arranged in a regular hexagonwIs 70 mm; the hole diameter ratio is 15-30 within the range of the hole diameter ratio n of the bagged sand well, namely the influence circle diameter deDiameter d of sand wellwRatio of
Figure BDA0002420804170000062
Find de1050mm, substituting deThe minimum drainage center distance l is 1419mm which is determined as 0.74l, the width b of the bagged sand well is measured as 369mm, and a plan design schematic diagram is drawn according to the calculated data.
FIG. 6 shows the diameter d of the bagged sand well within the range of 70-100 mm when the bagged sand wells are arranged in a regular hexagonwIs 100 mm; the hole diameter ratio is 30 when the hole diameter ratio range n is 15-30, namely the influence circle diameter deDiameter d of sand wellwRatio of
Figure BDA0002420804170000063
Find de3000mm, substituting deThe maximum drainage center distance l obtained at 0.74l is 4054mm, and the bagged sand well width b is 10564mm, and a plan design schematic diagram is drawn according to the calculated data.
In the figure: 1-bagged sand wells I and 2-bagged sand wells I are arranged in a regular triangle, the influence range is assumed to be a regular hexagon I when the bags are arranged in the 3-regular triangle, and the actual influence range is a circle I when the bags are arranged in the 4-regular triangle; 5-the bagged sand wells II and 6-the bagged sand wells II are arranged in a square shape, the influence range is assumed to be the square II when the bagged sand wells II are arranged in the 7-square shape, and the actual influence range is the circular II when the bagged sand wells II and the 7-square shape are arranged in the 8-square shape; the 9-bagged sand well III and the 10-bagged sand well III are arranged in a regular hexagon, the influence range is assumed to be a regular triangle III when the 11-bagged sand well is arranged in the regular hexagon, and the actual influence range is a circle III and 13-plastic drainage belt when the 12-bagged sand well is arranged in the regular hexagon.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
A horizontal arrangement method for draining water and salt in soft foundation of saline soil includes deriving the original planar design formula of vertical drainage body by drainage consolidation method, assuming that the influence range of a bagged sand well is a regular pattern to make its area equal to the area of actual influence circle, and deriving the formula, i.e. the diameter d of influence circle of vertical drainage body sand welleThe relation with the center distance l of the drainage body; the details are as follows.
Example 1
And (3) derivation of a formula when the bagged sand well I1 is arranged according to the equilateral triangle 2. As shown in fig. 1 and 2, when arranged in an equilateral triangle, the area of influence of a sand well is assumed to be a regular hexagon i 3, and the actual area of influence is a circle i 4 and is a circumcircle of the regular hexagon, so that the areas of the two are approximately equal. Setting the influencing circle diameter of the sand well as deThe center distance between adjacent sand wells is l, the radius of the circumscribed circle is r, the side length of the regular hexagon is r, and each side of the regular hexagon is a perpendicular bisector of the equilateral triangle.
By the formula:
Figure BDA0002420804170000071
obtaining by solution:
Figure BDA0002420804170000072
area of regular hexagon:
Figure BDA0002420804170000073
by the formula:
Figure BDA0002420804170000074
find l and deThe relationship is as follows:
Figure BDA0002420804170000075
example 2
And (5) deducing a formula when the bagged sand wells II 5 are arranged according to the square 6. When arranged in a square, as shown in fig. 3 and 4, the influence range of a sand well is assumed to be a square ii 7, and the actual influence range is a circle ii 8, so that the areas of the two are approximately equal, and the side length of the assumed square is equal to the center-to-center distance l of the sand well.
By the formula:
Figure BDA0002420804170000081
find l and deThe relationship is as follows:
Figure BDA0002420804170000082
example 3
By analogy with the arrangement mode of equilateral triangle and square, the bagged sand wells are arranged according to the arrangement mode of regular hexagon.
(1) As shown in fig. 5 and 6, when the bagged sand wells iii 9 are arranged according to the regular hexagon 10, it is assumed that the influence range of one sand well is a regular triangle iii 11, the actual influence range is a circle iii 12, the assumed side length of the regular triangle is equal to the sand well center distance l, and the two sides of the regular triangle are perpendicular to the regular hexagon, so that the area of the regular triangle is equal to the area of the influence circle.
(2) Let the triangle have an area S1：
Figure BDA0002420804170000083
Let the circular area be S2:
Figure BDA0002420804170000084
Find l and deThe relationship is as follows: s1＝S2
Figure BDA0002420804170000085
Figure BDA0002420804170000086
(3) And the bagged sand well is arranged according to the regular hexagon, and partial regions which are not in the range of the influence circle are drained by adopting the plastic drainage belt 13, so that the drainage method combining the bagged sand well and the plastic drainage belt is realized, water and salt can be fully discharged, and the soil body is drained and consolidated. According to the assumed value, i.e. dwWhen the well diameter ratio is 15, drawing a graph, and drawing a range for arranging the plastic drainage belt, wherein the range is shown in figure 5, and the width b of the plastic drainage belt is measured to be 369 mm; according to the assumed value, i.e. dwWhen the well diameter ratio is 30, which is 100mm, a graph is drawn to show a range where the plastic drainage strip is arranged, as shown in fig. 6, and the width b of the plastic drainage strip is measured to be 1054 mm. The width of the plastic drainage belt meets the requirements of the dimension and quality standard of the section of the plastic drainage belt, namely the width is more than 95 mm. Taking a plastic drainage belt with the minimum thickness requirement of 4 mm;
the formula of the equivalent diameter of the plastic drainage belt is as follows:
Figure BDA0002420804170000091
Figure 421398DEST_PATH_1
therefore, the thickness of the plastic drainage strip can be increased, and the thickness meets the requirement of being more than 4 mm.
(4) Calculating the water flow of the vertical drainage body
A water passing formula of the sand well;
Figure BDA0002420804170000093
qw-is the displacement per unit time under a hydraulic gradient;
Kw-vertical drainage permeability coefficient;
dw-diameter of sand well.
It can be seen from the water flow calculation formula of the sand well that when the bagged sand well with the same diameter is arranged, the water flow of the regular hexagonal horizontal arrangement scheme of the novel water and salt drainage is the same as that of the original regular triangle and square, but the arrangement of the plastic drainage belt is added on the basis of the arrangement of the bagged sand well due to the regular hexagonal horizontal arrangement scheme, and the table 1 shows the water flow and the applicable construction depth of the plastic drainage belt in the plastic drainage plate quality inspection standard, so that the water drainage of the embodiment 3 is obviously greater than that of the original arrangement scheme (the embodiment 1 and the embodiment 2), and the salt and salt drainage effect is better.
TABLE 1 Water flow and driving depth of plastic drainage strip
Type of plastic drainage plate Type A Type B C type
Longitudinal water flow (cm)3/s) ≥15 ≥25 ≥40
Suitable driving depth (m) ＜15 ＜25 ＜35
The invention can fully discharge salt and water in the soft foundation of the saline soil, the bagged sand well is particularly suitable for the foundation reinforcement engineering limited by the disturbance condition around, and the plastic drainage belt method is suitable for deep-layer soft soil foundations and sand-lacking soft foundation areas, thereby enlarging the application range of the vertical drainage channel, improving the reinforcement effect of the soil body and reducing the post-construction settlement.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the above examples are not intended to limit the invention in any way and that any arrangement which is calculated to achieve the above objectives, such as variations, modifications, equivalents, or equivalent arrangements, will fall within the scope of the invention.

Claims (1)

1. A horizontal arrangement method for draining water and discharging salt of soft foundation of saline soil is characterized in that: the method comprises the following steps:
(1) the bagged sand wells are arranged according to a regular hexagon, the influence range of one sand well is assumed to be a regular triangle, the actual influence range is a circle, the side length of the regular triangle is assumed to be equal to the central distance of the sand well and is l, and two sides of the regular triangle are perpendicular to the regular hexagon, so that the area of the regular triangle is equal to the area of the influence circle;
(2) let the triangle have an area S1：
Figure FDA0002420804160000011
Let the circular area be S2：
Figure FDA0002420804160000012
Calculating the ratio of l to the diameter deThe relationship is as follows: s1＝S2
Figure FDA0002420804160000013
Figure FDA0002420804160000014
(3) The bagged sand well is arranged according to the regular hexagon, and partial areas which are not in the range of the influence circle are drained by adopting the plastic drainage belt, so that the bagged sand well is combined with the plastic drainage belt; according to the diameter d of the sand wellwWhen the diameter of the well is 15 mm, drawing a graph, drawing a range for arranging the plastic drainage belt, and measuring the width b of the plastic drainage belt to be 369 mm; according to the diameter d of the sand wellwWhen the diameter of the well is 30 mm, drawing a graph, drawing a range for arranging the plastic drainage belt, and measuring the width b of the plastic drainage belt to be 1054 mm; the width of the plastic drainage belt meets the requirements of the dimension and quality standard of the section of the plastic drainage belt, namely the width is more than 95 mm; the minimum thickness requirement of the quality standard of the plastic drainage belt is 4 mm:
the formula of the equivalent diameter of the plastic drainage belt is as follows:
Figure FDA0002420804160000015
Figure 1
therefore, the thickness of the plastic drainage belt is increased, and the thickness meets the requirement of being more than 4 mm;
(4) and calculating the water flow of the vertical drainage body.
Water supply of sand wellA quantity formula;
Figure FDA0002420804160000022
qw-is the displacement per unit time per unit hydraulic gradient;
Kw-vertical drainage permeability coefficient;
dw-the diameter of the sand well.
CN202010205005.3A 2020-03-23 2020-03-23 Horizontal arrangement method for draining water and discharging salt of soft foundation of saline soil Active CN111395303B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140135671A (en) * 2014-07-11 2014-11-26 주식회사 지앤지테크놀러지 Apparatus for sense and alarm blocking of open type well
CN105804046A (en) * 2016-04-06 2016-07-27 化学工业岩土工程有限公司 Processing method for soft clay foundation
CN105804045A (en) * 2016-03-29 2016-07-27 江苏鸿基水利建设工程有限公司 Equipment for strengthening deep soft soil foundation by vacuum preloading of filter well and method
CN106436684A (en) * 2016-11-21 2017-02-22 中铁上海设计院集团有限公司 Water drainage reinforcing device for prepressing treatment of deep soft soil roadbed and application method of water drainage reinforcing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140135671A (en) * 2014-07-11 2014-11-26 주식회사 지앤지테크놀러지 Apparatus for sense and alarm blocking of open type well
CN105804045A (en) * 2016-03-29 2016-07-27 江苏鸿基水利建设工程有限公司 Equipment for strengthening deep soft soil foundation by vacuum preloading of filter well and method
CN105804046A (en) * 2016-04-06 2016-07-27 化学工业岩土工程有限公司 Processing method for soft clay foundation
CN106436684A (en) * 2016-11-21 2017-02-22 中铁上海设计院集团有限公司 Water drainage reinforcing device for prepressing treatment of deep soft soil roadbed and application method of water drainage reinforcing device

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