CN1093766A - Soft-clay lime deep-layer consolidation method - Google Patents
Soft-clay lime deep-layer consolidation method Download PDFInfo
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- CN1093766A CN1093766A CN 93104446 CN93104446A CN1093766A CN 1093766 A CN1093766 A CN 1093766A CN 93104446 CN93104446 CN 93104446 CN 93104446 A CN93104446 A CN 93104446A CN 1093766 A CN1093766 A CN 1093766A
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Abstract
The present invention mixes calcium lime powder, cement flour or calcium lime powder and cement flour for moulding shape bury stratum to stream, it is that curing compound carries out fixed a kind of soft-soil foundation treatment method that calcium lime powder adds flyash, it is by equipment such as the band drill bit of stirring vane and portable drilling rig, powder transmitter, air compressors powder to be sprayed into the soil body to mix and stir into grey earth pillar, grey cob wall, dirt plate or dirt entity, and the amount of dusting is 15-20%.Present technique is applicable to that the degree of depth is the remoldability soft clay foundation processing that stream is moulded state that is in 30 meters.
Description
The invention belongs to and mould shape bury stratum to stream and mix curing compound and make its fixed a kind of soft-soil foundation treatment method.
The Soft Ground technology is of a great variety, as sand pile, sand drain, plastic draining board, piling prepressing or the like.(content of d≤0.002mm) is greater than 50% for fine grained, index of plasticity is greater than 25 remoldability bury, and locate the stratum that stream is moulded state, the ground stabilization difficulty is big, poor reliability, common technology is difficult to obtain good result, usually adopt vacuum method, the churning method, technology such as the deep mixing method that dusts are reinforced, be shaped as agitation pile with the bearing capacity that increases the soil body, Load Transfer is arrived bearing stratum.But when vacuum method was implemented, complex process, construction costs were higher.The churning method sprays into and contains water in the slurries, and it obviously is disadvantageous that convection current moulds that the state soil body reinforces.The deep mixing method technology of dusting is in soft soil layer, by holing in the column that destroys, use compressed air that powders such as cement or lime are evenly sprayed into, formation is the composite foundation of main supporting body with the teeter column that dusts, reach the purpose that improves bearing capacity of foundation soil, this technology is applicable to coarse granule, and (content of d≤0.002mm) is greater than 50% soil, as lam, mud matter lam or miscellaneous fill stratum, and be that curing compound is preferable with the spraying cement powder.And in the processing of remoldability soft clay foundation, adopt and do spray lime deep-layer paddling process, in engineering practice, differ greatly owing to consolidation effect, particularly lime belongs to the air-setting material, on the saturated soil stratum, particularly adopt in the following deep layer stratum of groundwater table, the report of failure is arranged when in the engineering its validity being held the suspicious attitude.(the academic proceeding of the 6th soil mechanics and Foundation Design " reason of a Base Consolidation Engineering failure ") so technology limited to aspect the construction work practicality.
The objective of the invention is to be in the ground stabilization that stream is moulded state remoldability bury for solution.It is a kind of new method for processing foundation that improves and develop on the basis of deep layer stirring technique of dusting.
The present invention is such enforcement: the calcium lime powder that adopts serial special equipment to mix 15-30% in stream is moulded state remoldability soft clay stratum according to the Technological Economy requirement of design is that curing compound evenly mixes and stirs formation lime earth pillar, lime cob wall, rendzinas plate or rendzinas entity, make mix body and the interior undisturbed soil curing of influence basin on every side thereof, reinforcement depth can be to 30 meters of below grounds, to reach bearing capacity, stability and the impervious and minimizing sedimentation sex change that improves soil effectively.Technology of the present invention is applicable to soft soil layer, and (d≤0.002mm) is main, and fine particle content is greater than 50%, and the index of plasticity of stratum soil is in the remoldability bury that stream is moulded state greater than 25 particularly to contain fine grained.
Below in conjunction with accompanying drawing in detail method of the present invention is described in detail.
Fig. 1 is the grey earth pillar of the back formation of dusting,
Fig. 2 is the grey cob wall of the back formation of dusting,
Fig. 3 is the dirt plate of the back formation of dusting,
Fig. 4 is the dirt entity of the back formation of dusting.
Require according to engineering during enforcement and the soil property determination data, design curing agent and the amount of dusting thereof, dust and layout and dust the degree of depth. Main drill bit and the portable drilling rig that utilizes with stirring vane on the technology, the powder transmitter, the serial equipments such as air compressor, in the soil body that is destroyed by blade, spray into the lime powder, repeatedly evenly mix and stir formation grey earth pillar as shown in Figure 1, namely in being reinforced the soil body, be arranged to independently pile, the pile center distance is the pile diameter greater than 2.0d(d), when the pile center distance less than 2.0d, make each pile form overlap joint in a direction, dust the grey cob wall of rear formation as shown in Figure 2, when each pile all forms overlap joint at both direction, and column length H is less than reinforcing scope length of side B, i.e. H＜B, and perhaps the pile bottom surface does not reach The bottom of soft soil layer, the rear formation dirt plate that dusts, as shown in Figure 3, when each stanchion all forms overlap joint at both direction, and H 〉=B, perhaps the pile bottom surface exceeds the soft soil layer bottom surface, the rear formation dirt entity that dusts, as shown in Figure 4.
After forming the dirt pile, inter-pile soil is because of the impact of dirt physics, chemical reaction, and solidification effect is along with the distance of cylinder reduces and improves, when pile center distance≤2.0d, soil between pile and pile can be looked as a whole, have same solidification effect, be i.e. so-called post and post overlap joint.
The amount of dusting, the ratio that namely mixes curing agent quick lime weight and lime soil pile weight is 15-20%. The amount of dusting is less than 15% the time, and ash content is too small in the rendzinas, suction and caloric value deficiency in the rendzinas hydration reaction, can not give full play to humidification, and after the amount of dusting is greater than 20%, because of lime content bigger than normal, carburizing reagent is slow or incomplete, will cause the dirt pile strength to descend. Can strict selection and the control amount of dusting be to be related to the crux factor that obtain good foundation stabilization effect.
According to the technical requirements of soil structure that is reinforced the stratum and engineering, the curing compound that is mixed, can be selected for use calcium lime powder and cement flour or calcium lime powder, cement to add flyash and form combined built pile or reinforced wall with the calcium lime powder except that single.
Adopt lime deep-layer consolidation stream of the present invention to mould shape remoldability bury technology, form consolidated subsoil with grey earth pillar, grey cob wall, dirt plate or dirt entity, improve bearing capacity of foundation soil, reduce building settlement, be used to improve the mechanical property of soil, increase the angle of internal friction and the cohesion of soil, alleviate lateral pressure to building, pattern foundation pit supporting structure when making the underground structure excavation with grey cob wall, play diaphragm wall, steel sheet pile supporting and the antiseepage effect of replacing, be used for reinforcing side slope, reduce the effect of quantity of earth work.The technology of the present invention is reliable, and engineering cost can reduce significantly, can be widely used in middle and lower reaches area and lakeside areas such as the Changjiang river, the Zhujiang River, the Min River, in speedway, bridge engineering, Industrial and Civil Engineering.
Embodiment 1:
Certain canal case engineering, length overall 154m, wide 3.5m is the artificial earth fill in the high 2.5m, foundation soil top layer 1m, the thick 3-4m of following mud, the thick about 3.5m of trip shale flour sand, index of plasticity is 35, is the piebald clay down.The former reinforced concrete pipe column basis that is designed to of this engineering, after use the technology of the present invention instead and be treated to foundation soil lime earth pillar underpinning, post array pitch * row distance is 1.5 * 2.0m, column length 8.5m, column diameter is 0.5m, the lime incorporation is 16% in the rendzinas, handle the on-the-spot load test in back and determine that bearing capacity of foundation soil is 60KPa, through excavation check, intercolumniation soil is fixed good, check settling amount average 18mm after 1 year, meet engine request, adopt the more former design scheme of present technique engineering cost can save 410,000 yuan of investments.
Embodiment 2:
Certain canal case engineering, length overall 231m, basic wide 3.3m.Soil remoldability silt clay thick 17.6m in stratum more than is a barged-in fill, and this engineering adopts the lime consolidation process foundation technology gross area of the present invention to reach 762 square metres, the total linear meter(lin.m.) 3560m of the post that dusts.The employing pilespacing is 0.7 * 2.5m, stake footpath 0.5m.Column length 6.5m promptly forms the dirt plate in the foundation soil mud that is reinforced, do not reach the following bearing stratum of buried depth 17.6m at the bottom of the pile.Ground adheres to specification after handling after testing, and total settlement 1.5 years was 23mm behind the m, only was 1/3 of designed amount of precipitation.
Embodiment 3:
Certain mansion basement excavates big pattern foundation pit supporting structure.3600 square metres of foundation ditch areas, cutting depth 8m.Gu around the foundation ditch building is arranged all, construction should be guaranteed existing building safety.The top layer, stratum is the 1m miscellaneous fill, below moulds shape mud for the thick stream of 6m.This engineering adopts grey cob wall supporting of the present invention, the Shi Po excavation.Stake is 0.5m directly, pilespacing 1m, and employing is arranged the stake of dusting than big pilespacing behind the wall, and with earth lateral pressure behind the minimizing wall, more former design can be saved great amount of investment with diaphragm wall after employing the technology of the present invention, the reduction of erection time, excavate the back stability of slope, guaranteed the safety of existing building thing.
Embodiment 4:
The soft soil roadbed treatment project of certain speedway D section.The roadbed depth of fill is 6m, and foundation soil is moulded the shape silt clay for grey stream under the roadbed, natural moisture content 74.58%, and it moulds the shape light loam firmly for plastic-one down.It is 60 * 50m that the present technique ground is handled segment length * wide, and thickness is 5m, and adopting calcium lime powder to add flyash is curing compound, and replacement ratio is 0.196.Total settlement is about 30 centimetres as calculated, and the residual settlement amount is only 6 centimetres during the high class pavement construction, can satisfy requirement of engineering.Carry out now finishing after the engineering completion, carry out on-the-spot load test, foundation settlement is 2.96-4.12 centimetre when pressure is 175KPa, the bearing capacity that do not reach capacity, and modulus of deformation Ec minimum is 9.6MPa.
Embodiment 5:
Certain factory's general storage depot, insulated column basis and the supporting of founding groove excavation of foundation pit.The stratum is that 0-4.5m ploughs and to plant soil, and 4.5-8.8m is a remoldability mud, and 8.8m is following to be flour sand.Adopt Ground Treatment of the present invention, spray into quicklime or cement formation coupled column respectively by the different soil properties in stratum, and the part stake sprays into cement in supporting, and the supporting body of wall is strengthened.The construction groundwork allows bearing capacity greater than 150KPa, and the excavation of foundation pit supporting is good, and the hole wall does not have the underground water infiltration.
Claims (2)
1, a kind of method of mixing weak soil layer consolidated subsoil by the quicklime of serial special equipment as curing compound, it is characterized in that moulding the remoldability bury of state to being in stream, the degree of depth be 30 meters with interior soil layer, the curing compound that mixes 15-20% mixes and stirs and forms grey earth pillar, grey cob wall, dirt plate or dirt entity.
2, the method for soft clay stratum consolidated subsoil according to claim 1 is characterized in that the curing compound that mixes is that calcium lime powder and cement flour or calcium lime powder, cement add flyash and forms combined built pile or strengthen wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93104446 CN1093766A (en) | 1993-04-14 | 1993-04-14 | Soft-clay lime deep-layer consolidation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93104446 CN1093766A (en) | 1993-04-14 | 1993-04-14 | Soft-clay lime deep-layer consolidation method |
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| Publication Number | Publication Date |
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| CN1093766A true CN1093766A (en) | 1994-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 93104446 Pending CN1093766A (en) | 1993-04-14 | 1993-04-14 | Soft-clay lime deep-layer consolidation method |
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| CN (1) | CN1093766A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410455C (en) * | 2006-08-14 | 2008-08-13 | 毛心焰 | Strong rammer treatment high-water content foundation soil auxiliary construction process |
| CN100439605C (en) * | 2006-07-25 | 2008-12-03 | 南京大学 | Chopped fiber reinforced rendzinas ground treatment method |
| CN101008178B (en) * | 2007-01-12 | 2010-05-19 | 中山大学 | Soft base processing construction process using excavating and stirring method |
| CN102212465A (en) * | 2011-06-22 | 2011-10-12 | 高节义 | Large-scale methane tank |
| CN101748910B (en) * | 2009-12-23 | 2012-02-22 | 赵天祥 | Construction facility |
| CN103912005A (en) * | 2014-04-14 | 2014-07-09 | 五邑大学 | Foundation structure |
| CN106049406A (en) * | 2016-06-01 | 2016-10-26 | 上海建研地基基础工程有限公司 | Method for lightly tampering lime soil foundation |
| CN106638575A (en) * | 2017-01-10 | 2017-05-10 | 邓亚光 | Reinforcing method of pile body |
| CN108117358A (en) * | 2017-12-29 | 2018-06-05 | 福建建工建材科技开发有限公司 | A kind of curing of waste soil combined processing |
| CN108166470A (en) * | 2017-12-26 | 2018-06-15 | 武汉广益交通科技股份有限公司 | A kind of method of cementitious composite waste plastics stake soft soil foundation |
| CN109987805A (en) * | 2019-01-10 | 2019-07-09 | 浙江海洋大学 | Waterway dredging slurry curing equipment |
| CN110258507A (en) * | 2019-06-15 | 2019-09-20 | 武汉中力岩土工程有限公司 | A kind of soft soil foundation reinforcing method |
| CN117431970A (en) * | 2023-12-22 | 2024-01-23 | 四川交通职业技术学院 | Intelligent supporting device and supporting method for roadbed pit |
-
1993
- 1993-04-14 CN CN 93104446 patent/CN1093766A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439605C (en) * | 2006-07-25 | 2008-12-03 | 南京大学 | Chopped fiber reinforced rendzinas ground treatment method |
| CN100410455C (en) * | 2006-08-14 | 2008-08-13 | 毛心焰 | Strong rammer treatment high-water content foundation soil auxiliary construction process |
| CN101008178B (en) * | 2007-01-12 | 2010-05-19 | 中山大学 | Soft base processing construction process using excavating and stirring method |
| CN101748910B (en) * | 2009-12-23 | 2012-02-22 | 赵天祥 | Construction facility |
| CN102212465A (en) * | 2011-06-22 | 2011-10-12 | 高节义 | Large-scale methane tank |
| CN103912005A (en) * | 2014-04-14 | 2014-07-09 | 五邑大学 | Foundation structure |
| CN106049406A (en) * | 2016-06-01 | 2016-10-26 | 上海建研地基基础工程有限公司 | Method for lightly tampering lime soil foundation |
| CN106638575A (en) * | 2017-01-10 | 2017-05-10 | 邓亚光 | Reinforcing method of pile body |
| CN108166470A (en) * | 2017-12-26 | 2018-06-15 | 武汉广益交通科技股份有限公司 | A kind of method of cementitious composite waste plastics stake soft soil foundation |
| CN108117358A (en) * | 2017-12-29 | 2018-06-05 | 福建建工建材科技开发有限公司 | A kind of curing of waste soil combined processing |
| CN109987805A (en) * | 2019-01-10 | 2019-07-09 | 浙江海洋大学 | Waterway dredging slurry curing equipment |
| CN110258507A (en) * | 2019-06-15 | 2019-09-20 | 武汉中力岩土工程有限公司 | A kind of soft soil foundation reinforcing method |
| CN110258507B (en) * | 2019-06-15 | 2021-05-14 | 武汉中力岩土工程有限公司 | Soft soil foundation reinforcing method |
| CN117431970A (en) * | 2023-12-22 | 2024-01-23 | 四川交通职业技术学院 | Intelligent supporting device and supporting method for roadbed pit |
| CN117431970B (en) * | 2023-12-22 | 2024-04-09 | 四川交通职业技术学院 | Intelligent supporting device and supporting method for roadbed pit |
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