CN101831901A - Shallow poor subsoil composite foundation stabilization treatment method - Google Patents
Shallow poor subsoil composite foundation stabilization treatment method Download PDFInfo
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- CN101831901A CN101831901A CN201010177410A CN201010177410A CN101831901A CN 101831901 A CN101831901 A CN 101831901A CN 201010177410 A CN201010177410 A CN 201010177410A CN 201010177410 A CN201010177410 A CN 201010177410A CN 101831901 A CN101831901 A CN 101831901A
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Abstract
The invention relates to a shallow poor subsoil composite foundation stabilization treatment method, which comprises: firstly, digging a hole with a diameter of 100 to 130 millimeters and a depth of 4 to 15 meters, and keeping an inter-pile distance between 800 an 1,000 millimeters; secondly, inserting an earthwork pipe bag, which has a diameter of 150 to 180 millimeters, the same length as the hole and a sealed bottom end, into the hole; preparing a lime-clay mixed filler; filling the mixed filler to the bottom of the earthwork pipe bag, ramming the filler layer by layer to a limited density; and curing the filler in the air naturally, forming shallow bagged and compacted lime piles with a small diameter with the mixed material, laying a 400 to 600 millimeter coarse soil cushion layer on the ground surface of the stabilized area, and rolling the cushion layer with a small mill till the cushion layer is dense. The method can effectively reduce engineering cost, simplify construction working procedures and meet construction requirements.
Description
Technical field
The present invention relates to a kind of shallow combination method for processing foundation, particularly handle the method for deep soft soil such as collapsible loess, plain fill, miscellaneous fill and bury, belong to the geotechnical engineering field.
Background technology
Collapsible loess be a kind of little based on powder, porous crack, natural moisture content, be yellow, tawny clay soil, saturated yielding takes place down and sinks in lotus or deadweight effect outside after the immersion, can be divided into self-collapsibility and non-self-collapsibility two classes.The saturated yielding characteristic of loess is the principal element that causes place building, road damage.
The characteristics that soft foundation has the natural moisture content height, void ratio is big, compressibilty is high, shear strength is low, the coefficient of consolidation is little, bad hydraulic permeability, layered distribution complexity, interlayer physico-mechanical properties differ greatly.Bearing capacity is generally very low, and resistance to overturning is relatively poor, therefore must take suitable foundation treatment mode when utilizing this type of soft foundation.Present stage is a composite foundation technology to the main processing mode that this type of soft foundation adopts, and makes the natural ground part soil body be enhanced, and forms the stabilization zone of desired depth and scope.Composite foundation soft ground treatment soil mainly contains following several method: (1) admixture curing compound (cement earth pile, lime pile, lime soil pile etc.); (2) loose material displacement (broken stone pile, sand pile); (3) pre-formed stake (low strong plain concrete pile, reinforced concrete pile, steel pipe pile etc.).
The deep soft foundation in little place refers to that the project site scope is at 100～5000m
2About, soft layer thickness 〉=10m, on this type of ground building for small-sized point type building (storehouse, pump house, sluice etc.) or other temporary building, from heavy and light, influence depth bounds limited (5～8m), for the corresponding reduction of the processing requirements of foundation soil.
Characteristics according to little place soft foundation, the soft foundation processing mode can not meet the demands fully on a large scale, there is pile body embedded depth dark excessively (generally running through the weak soil layer), stake footpath big (600～1000mm), the construction machinery heaviness difficulty of marching into the arena, the weakness that construction technology complexity, expense are higher relatively, thereby the composite foundation stabilization of little place soft foundation handled, there is certain drawback in this type of composite foundation construction method.
Summary of the invention
Technical problem to be solved by this invention provides the deep soft foundation processing method in a kind of little place, and a kind of shallow poor subsoil composite foundation processing scheme-bagged compacting minor diameter lime pile composite foundation is provided.Advantage by this processing scheme performance minor diameter lime pile reduces construction costs, simplifies working procedure, satisfies construction requirement.
Shallow poor subsoil composite foundation stabilization treatment method of the present invention, its technical scheme may further comprise the steps:
1) prebored hole and geotextile tube bagging are established: use small-sized drill or luoyang spade digging diameter 100～130mm, the hole of the degree of depth 4～15m, pile spacing 800～1000mm; Insert the geotextile tube bag of the same dark and bottom sealing of diameter 150～180mm afterwards;
2) material is filled in the mixing of preparation lime mix clay: fully clear up lime, and even with cohesive soil that digs out on the spot and inductile silt mix;
3) filling tamped is compacted: the mixing that mixes is filled and is expected to fill out to deliver at the bottom of the geotextile tube bag, and layering is rammed limited closely knit;
4) maintenance pile: natural Health preservation in air, compound form shallow-layer bagged compacting minor diameter lime pile, make soft foundation intensity reach design and code requirement;
5) lay the Coarse Aggregate bed course: after the lime pile pile body is shaped and possesses certain intensity, lay the thick coarse-grained soil bed course of 400～600mm, small-sized stone roller machine grinding compacting on the stabilization zone face of land.
Above-mentioned steps 2) preparation lime mix clay mixes the step of filling material and is:
(1) selects fresh block of ash for use, use to clear up in preceding 4～7 days and sieve, make particle diameter≤5mm; The mix clay adopts and digs out clay on the spot, clay particle≤15mm, the visible organic cohesive soil of rejecting;
(2) lime is even by design lime-soil ratio mix in mix equipment with sticking two soil, and lime intermingled quantity should be in conjunction with design load and field condition, and scope is 6%～10%.
Solution of the present invention is to add bagged rammed lime clay mix in weak foundation soil, and hydrated lime after clearing up and cohesive soil chemical equation are: Ca (OH)
2+ CO
2→ CaCO
3+ H
2O, Ca (OH)
2+ SiO
2→ CaSiO
3+ H
2O, the hydrate of generation becomes the cementitious materials of grogs, soil mass consolidation.
The compacted compacting construction sequence of compacting is in the step 3): after bottom ash earth material fills and finishes, start the automatic drop weight rammer real machine compacting of eccentric wheel, repeat the above-mentioned compacting process of filling.According to volume and the definite compacting of fullness coefficient of filler and the finish-time of filler of geotextile tube bag, the compacting time was greater than three days.
Advantage of the present invention: bagged compacting minor diameter lime pile composite foundation is fully used the characteristics of the deep soft foundation in little place, it is effective composite foundation processing mode of handling the shallow-layer soft foundation, have and gather materials on the spot, control soil with soil, in-situ treatment, deep layer are encrypted and the lower characteristics of expense.Adopt high-strength minor diameter geotextile tube bag to load the rendzinas mix, limited compacted pile body surrounding soil forms highly dense miniature efficiency of pile groups.For keeping and improve the independence of lime pile body, select for use high-strength minor diameter geotextile tube bag constraint to fill discrete material.Bagged compacting minor diameter lime pile can obviously improve the engineering properties of shallow layer foundation soil, improves the intensity of foundation soil, reduces settlement after construction, is to handle little place soft foundation efficient ways.Compared to the lime pile scheme of large-area soft ground, the present invention has that technology is simple, speed of application is fast, construction equipment miniaturization, materials are economized, cost is low characteristics.Therefore, the present invention program can be used as specific little place soft soil foundation processing scheme.
Description of drawings
Fig. 1 is bagged compacting minor diameter lime pile composite foundation working procedure figure, and 1 is stake machine pore-forming, and 2 is the geotextile tube bag, and 3 is underlying material, and 4 is the coarse fodder soil padding, wherein:
Fig. 1 a, stake machine pore-forming;
Fig. 1 b, laying geotextile tube bag;
Fig. 1 c, fill underlying material compacting;
Fig. 1 d, filling tamped successively;
Fig. 1 e, filler are finished the rear surface and are laid the coarse fodder soil padding;
The specific embodiment
Below by embodiment the present invention is described in further details, these embodiment only are used for illustrating the present invention, do not limit the scope of the invention.
As Fig. 1, the geotextile tube bagging is established step: (1) uses the luoyang spade pore-forming, pore-forming standard: diameter of phi 120mm, degree of depth 4m, pile spacing 0.6m, triangular arrangement as Fig. 1 a; (2) as Fig. 1 b, utilize drilling rod with diameter 180mm, long 4.5m geotextile tube bag blind end is delivered at the bottom of the hole.
Lime mix clay mixes and to fill the material preparation steps and be: (1) selects fresh block of ash for use, waters to clear up the back in advance and cross the 5mm sieve; The mix clay adopts the clay that digs out on the spot, clay particle≤15mm, the visible organic cohesive soil of rejecting; (2) lime and clay is even by design lime-soil ratio mix in mix equipment, the quicklime incorporation is 8%.
As Fig. 1 c and Fig. 1 d, tamping compacted compacting construction sequence is: mix back rendzinas filler and fill out filling along the layering of geotextile tube bag, fill out and start the automatic drop weight rammer real machine compacting of eccentric wheel after irritating about 0.5m, hammer weight 〉=50kg into shape, fall apart from 0.8m, repeat above-mentioned rendzinas filler process after ramming end; Determine filler and tamp finish-time that by the volume of geotextile tube bag and the design fullness coefficient of filler the time of ramming was greater than three days.Maintenance pile under the natural conditions after the lime pile body is shaped.
As Fig. 1 e, Coarse Aggregate cushion construction step is: after the lime pile strength of the mixing pile reached 2Mpa, the thick coarse-grained soil bed course of 500mm, small-sized stone roller machine grinding compacting were laid in the stabilization zone face of land.
Bagged compacting minor diameter lime pile composite foundation of the present invention is deep soft foundation shallow combination method for processing foundation such as collapsible loess, plain fill, miscellaneous fill and bury, mainly utilize the displacement of lime pile, the limited compacted effect of contraction of suction, intensification expansion, gelling, carbonization and geotextile tube bag, make grey stone mar and inter-pile soil body form the shallow combination ground, improve the bearing capacity of foundation soil and shear strength, minimizing settlement of foundation of weak place soil.Bagged compacting minor diameter lime pile composite foundation utilizes the parcel effect of contraction of geotextile tube bag to reduce traditional lime pile diameter, reduces the pile body embedded depth, reaches the weak place of shallow-layer soil composite foundation stabilization effect.Therefore, bagged compacting minor diameter lime pile composite foundation mainly is applicable to the shallow combination ground stabilization processing of saturated yielding loess, deep mucky soil or soft clay foundation.Principal character is to utilize the grey soil body of high-strength minor diameter geotextile tube bag constraint compacting, and limited compacted surrounding soil forms the shallow combination ground.
Claims (3)
1. shallow poor subsoil composite foundation stabilization treatment method is characterized in that may further comprise the steps:
1) prebored hole and geotextile tube bagging are established: use small-sized drill or luoyang spade digging diameter 100～130mm, the hole of the degree of depth 4～15m, pile spacing 600～1000mm; Insert diameter 150～180mm afterwards with geotextile tube bag dark and the bottom sealing;
2) material is filled in the mixing of preparation lime mix clay: fully clear up lime, and even with cohesive soil that digs out on the spot and inductile silt mix;
3) filling tamped is compacted: the mixing that mixes is filled and is expected to fill out to deliver at the bottom of the geotextile tube bag, and layering is rammed limited closely knit;
4) maintenance pile: natural Health preservation in air, compound form shallow-layer bagged compacting minor diameter lime pile;
5) lay the Coarse Aggregate bed course: after lime pile intensity reaches 2～3Mpa, lay the thick coarse-grained soil bed course of 300～500mm, small-sized stone roller machine grinding compacting on the stabilization zone face of land.
2. shallow poor subsoil composite foundation stabilization treatment method according to claim 1 is characterized in that described step 2) preparation lime mix clay mixes the step of filling material and is:
(1) selects fresh block of ash for use, cleared up in 4～7 days of use and to sieve, make particle diameter≤5mm; The mix clay adopts the clay that digs out on the spot, and clay particle≤15mm rejects visible organic cohesive soil;
(2) lime and clay are even by design lime-soil ratio mix in mix equipment, and the quicklime volume is in conjunction with design load and field condition, and the scope of mixing is 6%～10%.
3. shallow poor subsoil composite foundation stabilization treatment method according to claim 1, it is characterized in that the compacted compacting construction sequence of filling tamped is in the step 3): after bottom ash earth material fills and finishes, start the automatic drop weight rammer real machine compacting of eccentric wheel, repeat the above-mentioned compacting process of filling, according to volume and the definite compacting of fullness coefficient of filler and the finish-time of filler of geotextile tube bag, the compacting time was greater than three days.
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| CN2010101774105A CN101831901B (en) | 2010-05-13 | 2010-05-13 | Shallow poor subsoil composite foundation stabilization treatment method |
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| CN101831901A true CN101831901A (en) | 2010-09-15 |
| CN101831901B CN101831901B (en) | 2012-04-25 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155009A (en) * | 2011-05-23 | 2011-08-17 | 中铁二院工程集团有限责任公司 | Crushed rock pile used for strengthening extremely soft soil foundation and construction method thereof |
| CN102465524A (en) * | 2010-11-11 | 2012-05-23 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction process thereof |
| CN102817353A (en) * | 2012-08-03 | 2012-12-12 | 华侨大学 | Composite soft clay foundation |
| CN104196004A (en) * | 2014-08-22 | 2014-12-10 | 中国建筑西南勘察设计研究院有限公司 | Overall length core pouring prestress pipe pile composite foundation |
| CN105780753A (en) * | 2016-03-28 | 2016-07-20 | 北京中岩大地科技股份有限公司 | Construction method for stabilized soil piles |
| CN105834206A (en) * | 2016-03-28 | 2016-08-10 | 北京中岩大地科技股份有限公司 | Treatment method of contaminated soil |
| CN105862861A (en) * | 2016-06-13 | 2016-08-17 | 上海强劲地基工程股份有限公司 | Rigid-pile embedding device and construction method |
| CN107326765A (en) * | 2017-08-25 | 2017-11-07 | 中铁西北科学研究院有限公司 | Handle segregated frozen ground ground lime pile and its construction method |
| CN108560345A (en) * | 2018-05-04 | 2018-09-21 | 刘刚 | Road construction pretreatment unit and its construction method |
| CN110130313A (en) * | 2019-05-30 | 2019-08-16 | 合肥建设装饰(集团)有限责任公司 | Method foundation stabilization tamping unit and its working method are rushed in a kind of shake |
| CN113073639A (en) * | 2021-04-13 | 2021-07-06 | 兰州大学 | Stepped loess foundation reinforcing method and built variable-rigidity combined pile composite foundation |
| CN114991112A (en) * | 2022-06-23 | 2022-09-02 | 河南城建学院 | Foundation construction method for eliminating loess collapsibility |
| CN115492087A (en) * | 2022-09-28 | 2022-12-20 | 中铁二院昆明勘察设计研究院有限责任公司 | Construction method of high-speed railway stone-sandwiched soft plastic soil foundation reinforcing pile |
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2010
- 2010-05-13 CN CN2010101774105A patent/CN101831901B/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102465524A (en) * | 2010-11-11 | 2012-05-23 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction process thereof |
| CN102465524B (en) * | 2010-11-11 | 2016-05-25 | 上海市政工程设计研究总院 | Double radial mesh-cage sand-gravel pile and construction technology thereof |
| CN102155009A (en) * | 2011-05-23 | 2011-08-17 | 中铁二院工程集团有限责任公司 | Crushed rock pile used for strengthening extremely soft soil foundation and construction method thereof |
| CN102817353A (en) * | 2012-08-03 | 2012-12-12 | 华侨大学 | Composite soft clay foundation |
| CN104196004A (en) * | 2014-08-22 | 2014-12-10 | 中国建筑西南勘察设计研究院有限公司 | Overall length core pouring prestress pipe pile composite foundation |
| CN105780753A (en) * | 2016-03-28 | 2016-07-20 | 北京中岩大地科技股份有限公司 | Construction method for stabilized soil piles |
| CN105834206A (en) * | 2016-03-28 | 2016-08-10 | 北京中岩大地科技股份有限公司 | Treatment method of contaminated soil |
| CN105862861B (en) * | 2016-06-13 | 2018-03-23 | 上海强劲地基工程股份有限公司 | A plant pile construction method |
| CN105862861A (en) * | 2016-06-13 | 2016-08-17 | 上海强劲地基工程股份有限公司 | Rigid-pile embedding device and construction method |
| CN107326765A (en) * | 2017-08-25 | 2017-11-07 | 中铁西北科学研究院有限公司 | Handle segregated frozen ground ground lime pile and its construction method |
| CN108560345A (en) * | 2018-05-04 | 2018-09-21 | 刘刚 | Road construction pretreatment unit and its construction method |
| CN108560345B (en) * | 2018-05-04 | 2020-08-07 | 绍兴市尊铖自动化设备有限公司 | Road construction pretreatment device and construction method thereof |
| CN110130313A (en) * | 2019-05-30 | 2019-08-16 | 合肥建设装饰(集团)有限责任公司 | Method foundation stabilization tamping unit and its working method are rushed in a kind of shake |
| CN110130313B (en) * | 2019-05-30 | 2020-12-01 | 合肥建设装饰(集团)有限责任公司 | Seismic impact method foundation stabilization tamping device and working method thereof |
| CN113073639A (en) * | 2021-04-13 | 2021-07-06 | 兰州大学 | Stepped loess foundation reinforcing method and built variable-rigidity combined pile composite foundation |
| CN114991112A (en) * | 2022-06-23 | 2022-09-02 | 河南城建学院 | Foundation construction method for eliminating loess collapsibility |
| CN114991112B (en) * | 2022-06-23 | 2024-03-22 | 中化地质河南局集团有限公司 | Foundation construction method for eliminating loess collapsibility |
| CN115492087A (en) * | 2022-09-28 | 2022-12-20 | 中铁二院昆明勘察设计研究院有限责任公司 | Construction method of high-speed railway stone-sandwiched soft plastic soil foundation reinforcing pile |
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|---|---|
| CN101831901B (en) | 2012-04-25 |
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Inventor after: Lin Caikui Inventor after: Xu Yiming Inventor after: Fang Jianqin Inventor after: Yang Hongjun Inventor after: Wu Zhanghua Inventor after: Xia Jian Inventor before: Fang Jianqin |
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