CN102995513B - Expanding material is utilized accurately to regulate and control the method for processing foundation of new and old roadbed relative settlement - Google Patents
Expanding material is utilized accurately to regulate and control the method for processing foundation of new and old roadbed relative settlement Download PDFInfo
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Abstract
The invention discloses a kind of method for processing foundation utilizing expanding material accurately to regulate and control new and old roadbed relative settlement, belong to the technical field of construction in civil engineering.Described method inserts expanding material in the ground of new road, by inserting the slow expansion of the expanding material volume in ground, progressively extrudes surrounding soil, and the porosity of final Shi Xin road ground each floor soil is consistent with old road foundation soil porosity.The present invention can control the relative settlement of the roadbed on new, experienced road exactly, and construction method is simple, is a kind of with low cost, the economic method for processing foundation accurately controlling settlement of foundation reliably.
Description
Technical field
The present invention relates to a kind of method for processing foundation, belong to the technical field of construction in civil engineering.Specifically refer to a kind of method for processing foundation utilizing expanding material accurately to regulate and control new and old roadbed differential subsidence.
Background technology
At present, highway widening engineering is in peak period in China.Highway widening engineering brings the new problem of road foundation process: husband road is through using for many years, and its ground completes consolidation under subgrade and pavement load and vehicle operating load action, and sedimentation is stable; And after newly-built widening road subgrade and pavement constructed, under subgrade and pavement Gravitative Loads and under vehicle operating load action, ground still can produce the sedimentation of a great deal of; Thus cause the relative settlement of new, experienced road, and then cause road structure to destroy, affect road and normally use.For avoiding this type of phenomenon to occur, strictly must control relative settlement that is new, old road base, namely strictly controlling the sedimentation of widening newly-built road foundation, the method for processing foundation such as concrete stake, cement earth pile of use construction costs costliness of usually having to.Even but the method for processing foundation of this high cost, be all difficult to accurately control its settling amount from its operating principle and method for designing.Therefore be difficult to obtain safety, economic engineering effort.
Summary of the invention
The process nature of ground generation sedimentation is the reduction of its porosity.Under identical soil condition, as long as after ground porosity reaches same level, under same load action, the settling amount of ground should be just the same.Ground under old road road structure deadweight and vehicle operating load effect under complete consolidation, soil cracking behavior reaches the minimum value under this load action, therefore under above-mentioned load action, new sedimentation can not occur.And the ground widened under the roadbed on new road not yet completes consolidation, the porosity of soil is still comparatively large, and therefore, under roadbed, road surface and Vehicle Load, foundation soil hole can continue to reduce, thus produces relative settlement that is new, old road base.Obviously, before the road structure construction of widening new road, if the porosity of foundation soil is equal with the porosity of foundation soil under old road under can making to widen new road, then under roadbed, road surface and vehicle operating load action, new roadbed also can not produce new sedimentation, and namely new and old roadbed can not produce relative settlement.
Based on this principle, the present invention proposes a kind of method for processing foundation, before the road structure construction of Ji Xin road, expanding material is inserted in the ground of new road, by inserting the slow expansion of the expanding material volume in ground, progressively extrude surrounding soil, the porosity of final Shi Xin road ground each floor soil is consistent with old road foundation soil porosity.The present invention is to provide a kind of method for processing foundation with low cost that accurately can control new and old roadbed settling amount, thus can control the relative settlement of the roadbed on new, experienced road exactly, concrete method for processing foundation is as follows:
The first step, determines the porosity difference of new road ground and old road ground.
According to current designs specification, the soil investigation, soil exploration under new, experienced road must be carried out before widening the construction of new road, the porosity of ground under new, experienced road can be obtained respectively from exploration report, the void content widened the ground unit volume soil body under new road and have more than the ground unit volume soil body under old road can be calculated accordingly, i.e. porosity difference.Hole unnecessary under adopting construction method provided by the invention to eliminate new road ground, can reach the object eliminating the relative settlement of the old and new's ground.
Second step, according to the porosity difference of new road ground and old road ground, determines desired depth of punching.
In new road and road widening part, select suitable position punching to desired depth.Described suitable position refers to punching on the ground of new road and add expanding material in hole after, the volume expansion that intumescent material swells produces can eliminate the porosity difference between new road ground and old road ground.
If old road ground void ratio is N
1, wait to widen new road ground void ratio N
0, after adding expanding material, when not expanding, radius footpath is R
0, the coefficient of cubical expansion of the expanding material chosen is μ, if section radius is R after expanding material complete expansion
1, adopt triangle pile arrangement, pitch of holes is x, and hole depth is h, identical according to squeezed front and back soil content, can obtain:
Can calculate pitch of holes according to formula (1) and formula (2) is x.The calculating of described pitch of holes, can adopt in two ways:
First kind of way is that the swell increment of the expanding material needed according to depth capacity place and new old road ground void ratio calculate pitch of holes, then selects different expanding materials to realize the even inflation on the ground of new road in the predetermined segment of different depth and reduces the void ratio of new road ground.
The second way is that the swell increment of the expanding material needed according to foundation surface place and new old road ground void ratio calculate pitch of holes, the even inflation on the new road ground then selecting different expanding materials to realize in the predetermined segment of different depth and reduce new road ground void ratio.
When new road ground punches, general aperture can between 7cm ~ 30cm.
The degree of depth that described desired depth Shi Xin road ground and the void ratio difference of old road ground are less than 2%.
Described punching can be punched straight down or be tilted to lower punching on ground, and the angle of angle of inclination and plumb line is 5 ~ 30 degree.
The content of described expanding material is determined according to the kind of expanding material and expansion rate and pore size.
3rd step, according to the expansion rate of expanding material, and porosity difference, calculate the expanding material kind needed for predetermined segment and the quality of hole depth.
Described predetermined segment is the different depth position of finger-hole.Due to the different depth place of new road ground and old road ground, the porosity difference of the two is different, therefore, in different predetermined segment, can calculate select different expanding material kinds and amount to add by formula (1) and formula (2).
4th step, new road ground punches to desired depth, in described hole, adds expanding material.
5th step, the reaction between each component of expanding material and between expanding material and water in soil, there is controlled slow expansion in the volume of expanding material, progressively extrudes surrounding soil, thus reach the effect that soil body discharging consolidation reduces ground porosity.
The described controlled component slowly expanding through adjustment expanding material realizes, and as when needs comparatively fast expand, the component that selection and water react fast as quicklime is more.
The mode of punching can adopt casting method and not casting method, and described casting method refers to outside the native delivery port in hole, as boring method, revolves the method for digging; Described not casting method, refers to, in pore forming process, the soil being in position, hole is pressed to the surrounding soil body, instead of discharge from aperture.The tubular apparatus of the unidirectional block device of usual use side headband, squeezes in soil by static pressure, hammering, vibration and spiral screw-in method by tubular apparatus, realizes not casting method pore-forming.
Add the expanding material in hand-hole, performance efficiency of its effect depends on its compaction rate in hole.The degree of compaction of the expanding material in hole is higher, and it is higher that it plays expansion efficiency, makes expanding material in hole, obtain abundant compacting and can adopt following 3 kinds of methods:
The first, by there being the pipe of the unidirectional block in end to implant in soil after desired depth, adding expanding material, being slightly less than the round bar of bore by expanding material dense extrusion with diameter in pipe; Limit extruding round bar, while take out outer for pipe; Take out pipe amplitude to be advisable without the whole volume of pore section can fill after the expanding material compacting added; Continue to fill expanding material, the process of pipe is taken out outside extruding round bar limit in limit, until the hole section intending adding expanding material all fills up expanding material and compacting is as the criterion.Then aperture soil or other materials are tamped.The actual degree of compaction of expanding material can according to aperture and the expanding material inserted Mass Calculation, and with predetermined compaction Control, general degree of compaction will reach more than 80%.Degree of compaction is higher, and the effect of adjustment porosity is larger.After desired depth squeezed into by pipe, to extract if filled the way that occasion that pipe can produce collapse hole can select this densification expanding material before expanding material, namely limit is filled and the method for pipe is taken out on compacting expanding material, limit.
The second, expanding material being inserted diameter is less than in pore-forming pipe external diameter 1-10mm mould, with forcing press, expanding material is pressed into the expanding material cylindrical piece of specifying degree of compaction (bulk density), the length sum of described cylindrical piece equals the desired depth in hole.To the pipe of the unidirectional block in end be had to implant in soil after desired depth, extract pipe, realization be punched; Expanding material cylindrical piece is filled in successively also compacting in hole, then envelope is filled out in aperture.After the pipe squeezing into desired depth is extracted, hole can keep shape, can not collapse hole, then can adopt and insert expanding material in this way and make expanding material closely knit.
The third, send into there being the pipe of the unidirectional block in end in soil and in pipe, add expanding material after desired depth, be slightly less than the round bar of bore by expanding material compacting with diameter.Then making round bar ram expanding material downwards makes expanding material squeezed in the soil body towards periphery, limit is filled expanding material limit and is rammed, pipe is outwards taken out in limit, repeat above-mentioned steps, all fill up to the hole section intending filling expanding material, pipe is all extracted out, and makes expanding material squeezed formation in soil be greater than the column of bore dia.The diameter of the expanding material column of squeezed rear formation is decided by that round bar rams vibratory compaction energy and soil body compaction rate.
Described expanding material is made up of two sections of material, i.e. expansion component and filling components.Wherein expansion component accounts for the percentage by weight of whole expanding material is 60% ~ 100%, and all the other are filling components, and described expansion component has following three classes:
(1) commercial lime that obtains of high-temperature calcination, comprises quicklime, or Extend position, or quicklime and Extend position combine.Wherein the temperature range of high-temperature calcination is 900 DEG C ~ 1200 DEG C, and Extend position calcination time exceedes normal calcination time 4 ~ 10 hours; Generally choose calcined limestone and obtain commercial lime.
(2) calcine the magnesia of generation at moderate temperatures, comprise dead burned magnesia or light calcined magnesia, or the combination of dead burned magnesia and light calcined magnesia, active oxidation content of magnesium reaches more than 75%.Wherein magnesia calcination temperature range is 800 DEG C ~ 1450 DEG C, sintering soak 1 ~ 10 hour; Generally choose calcined magnesite and obtain magnesia.
(3) combination of materials of calcium sulphoaluminate class can be generated, namely can generate calcium sulphoaluminate after various ingredients reaction.Such as: sulphate aluminium cement adds gypsum; High alumina cement adds gypsum; Aquation aluminic acid four calcium adds gypsum; Tricalcium aluminate adds gypsum; Aluminum sulfate adds lime and adds gypsum; Calcined alunite adds gypsum, natural alumstone adds gypsum etc.Proportioning between above-mentioned each component can with reference to existing known technology.
Can select as the case may be in practical operation the one in above-mentioned three class expanding material components, two kinds or three kinds combine, control speed of expansion and expanding volume.The particle size range of expanding material is advisable to be less than 1/2 aperture.
Described filling components is containing active silica, the industrial residue of active oxidation aluminium component or natural materials, as flyash, slag, calcining coal gangue, slag etc.It levigately should be less than 80 μm to particle diameter by filling components.
Two of above-mentioned expanding material kinds of components are got suitable ratio and domain size distribution according to actual needs, can use after stirring.
Usually a certain amount of water can be contained in foundation soil; if therefore use the water-swellable expanding materials rapidly such as quicklime, considerable part expands and occurs in work progress; expand to free space; so the expansion loss really for extrusion soil is very large, the expanding material that delay a period of time therefore should be used just to expand is more favourable.On the other hand, the soil body is particulate structure, under expansion slowly, the adjustment of soil body self structure progressively can form compact earth, if and adopt expansion rate expanding material faster, undergoes rapid expansion can make the soil body of nearly expansion sources because producing uneven excess in displacement, soil structures be destroyed, and the soil body away from expansion sources then may not obtain compacted.Therefore, time lagged swelling should be adopted for the expanding material in soil and the expanding material slowly expanded.According to water content situation in soil, should determine that expanding material forms.Such as: can quicklime be adopted when water content in ground is very low; And in ground during water content height, then can adopt Extend position and dead burned magnesia, and be combined to form the different combination of materials of expansion rate by certain burning degree, and the expanding material progressively expanded is formed with certain mechanical fraction.
The invention has the advantages that:
(1) the present invention utilizes the expansion characteristics of delayed expansion material, can eliminate the difference of different depth porosity between new, old road ground in controllable precise ground, avoid the generation of relative settlement.
(2) the present invention adopt that chemical method accurately controls newly, relative settlement problem between old road, construction method is simple, is a kind of with low cost, the economic method for processing foundation accurately controlling settlement of foundation reliably.
Accompanying drawing explanation
Fig. 1 is the schematic cross-section adopting vertical hole knockout to process new road ground before road structure is laid;
Fig. 2 a is the punching top view that tilts;
Fig. 2 b is the sectional view tilting to punch;
Fig. 3 is before roadbed paving structure does not also pave, to the schematic cross-section that new road ground processes.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the method for processing foundation for Xin Lu road surface provided by the invention is described in detail.
Embodiment one:
Certain highway widening engineering, widens 3 meters in the embankment of side, old road, knows according to exploration report: the soil layer in engineering ground 5 meters of degree of depth is mouldable state silty clay, and under Xin Lu and 5 meters, old road, soil property is hard, and the desired depth of therefore punching is set to 5 meters.The ground void ratio widened under the roadbed of new road is 1.0; Ground under old road completes discharging consolidation under road surface load and vehicle operating load, and void ratio is 0.6.Method for processing foundation provided by the invention is adopted to carry out process construction to new road ground, specific as follows:
(1) selection expanding material constituent mass percent is: commercial lime (calcining heat is 1100 DEG C, and be incubated 10 hours, calcium oxide content is greater than 90%) 90%, flyash 10%; Wherein the particle size range of commercial lime is less than 30mm, and powder containing quantity is about 10%.
(2) in ground place, the new road punching of parallel old road shoulder 55cm.Termination is vertically implanted in foundation soil with the tubular apparatus of unidirectional block device and is punched by the method adopting spiral to screw in by machine.The punching degree of depth is 5m, and aperture is 10cm, and adopt triangle pattern, pitch of holes 55cm is override interrupt successively.As Fig. 1.
(3), when filling expanding material, by there being the pipe of the unidirectional block in end to squeeze into after at the bottom of hole, in pipe, add expanding material, the round bar being slightly less than bore with diameter, by expanding material dense extrusion, makes compactness reach more than 95%.Pipe is taken out outside extruding round bar limit in limit, until filled out by expanding material apart from 55cm place, aperture, then no longer sinks to expanding material with small-sized hammer ram rammer, finally to be bound in aperture with rendzinas and tamps.
Embodiment two:
Certain highway widening engineering, in both sides, old road, 2 meter Xin Lu are widened in embankment respectively, know according to exploration report: be soft fill stratum of moulding in engineering ground 3 meters of degree of depth, its lower 12 meters of soil layers are mucky soil.Widen that place, section completes at embankment filled soil, before road structure not yet lays, the lower 3 meters of depth bounds inner pores of ground are that less than 0.7,3 meters mud void ratios are about 1.1 than gradually becoming by 0.65 from top to bottom; 3 meters, old road depth bounds inner pore ratio is that less than 0.6,3 meters void ratios progressively become 1.0 of 15 meters of from 0.65.Adopt method for processing foundation provided by the invention, concrete steps are as follows:
(1) selection expanding material Ingredient percent is: 60% magnesia (calcining heat 1450 DEG C, be incubated 8 hours), commercial lime (calcining heat is 1100 DEG C, and be incubated 10 hours, calcium oxide content is greater than 90%) 10%, 20% flyash, 10% slag; Active oxidation content of magnesium more than 85% in magnesia, magnesia particle diameter is less than 30mm, and dead burned magnesia accounts for 80% of magnesia quality, and powder containing quantity is less than 10%.
(2) punch straight down in the ground place beyond parallel old road shoulder 50cm.Be 80mm with rig drill diameter, the degree of depth is 15m hole.Adopt triangle pattern, pitch-row 50cm punches successively.
(3) in pipe, adding expanding material by there being the pipe of the unidirectional block in end to squeeze in soil after desired depth, being slightly less than the round bar of bore with diameter by expanding material compacting.Then making round bar ram expanding material downwards with certain heavy tamping energy makes expanding material squeezed in the soil body towards periphery, and limit is filled expanding material limit and rammed, and pipe is outwards taken out in limit; Wherein expanding material squeezed after, the degree of depth, from 16 meters to 3 meters, expands aperture and round table-likely to expand gradually by 120% to 160%; Internal orifice dimension apart from 3 meters, aperture is extended for original 110% to 125% from top to bottom, until apart from 50cm place, aperture, finally tamped by aperture gravelly soil and bind.
Embodiment three:
Certain highway widening engineering, widens 2.5 meters in side, old road high roadbed (5m), knows according to exploration report: be stream plastic state silty clay in engineering ground soil layer 8 meters, less than 8 meters is comparatively hard opaque soil layer.Widen that place, section completes at embankment filled soil, before road structure not yet lays, ground void ratio gradually becomes 8 meters 1.3 from top to bottom from 0.8; Ground under the base of known old road completes discharging consolidation under road surface load and vehicle operating load, and void ratio is progressively changed to 8 meters 1.2 from top to bottom by 0.6.
(1) selection expanding material Ingredient percent is: 50% sulphate aluminium cement, 31% gypsum, 13% calcining coal gangue, flyash 6%; Wherein domain size distribution accounts for gross mass percentage and is: particle diameter <1mm accounts for 60%, and particle diameter 1mm ~ 10mm accounts for 30%, and particle diameter >10mm accounts for 10%.
(2) (as Fig. 2 a, 2b) is in the ground place punching of parallel old road shoulder 90cm.Drilling through upper aperture with rig is 100mm, and lower aperture is 70mm, the bellmouth at 20 degree, inclination angle, direction, vertical old road, and punching length is 8.5m.Adopt triangle pattern, pitch of holes is 42cm.When making a call to the second round, drill through the cylindrical hole that aperture is 15 degree, inclination angle, direction, 100mm vertical old road, same construction method, 3rd round aperture is identical with first row aperture, inclination angle becomes 10 degree, 4th round is identical with second row but inclination angle becomes 5 degree, and straight down, aperture is identical with first row for last round.Last is 110mm making a call to a round footpath from 45cm place, old road, the degree of depth 1.5 meters bellmouth straight down.
(3), when filling expanding material, be that 70mm pipe is squeezed into after at the bottom of hole by there being the internal diameter of end block, in pipe, add expanding material, the round bar with diameter being 68mm, by expanding material dense extrusion, makes compactness reach 95%.Pipe is taken out outside extruding round bar limit in limit, until filled out by expanding material apart from 50cm place, aperture, then no longer sinks to expanding material with small-sized hammer ram rammer, finally to be bound in aperture with gravelly soil and tamps.
Embodiment four:
Certain highway widening engineering, 3.5m is widened in side, old road low embankment (2.5m), widen that place, section completes at embankment filled soil, before road structure not yet lays, known according to engineering exploration report: be silt soil strata void ratio within 7m below ground from 0.85 to 7m air space ratio 1.3; Ground 7m following mud void ratio in old road is progressively changed to the air space ratio 1.2 of 7m by 0.7.
(1) selection expanding material constituent mass fraction is: (calcining heat is 1200 DEG C to commercial lime, be incubated 10 hours, calcium oxide content is greater than 90%) 150 parts, magnesia (calcining heat 1450 DEG C, be incubated 1 hour) 180 parts, tricalcium aluminate 100 parts, 50 parts, gypsum, natural alumstone 10 parts, calcining coal gangue 10 parts;
(2) mixed by the expanding material of said components, importing internal diameter is 100mm, in the long barrel-shaped mould for 30cm, uses forcing press dense extrusion, makes expanding material cylindrical piece.In expanding material, the concrete mass fraction of each component is as follows:
(a) first group: commercial lime 40%, magnesia 40%, calcining coal gangue 20%;
(b) second group: commercial lime 30%, magnesia 50%, tricalcium aluminate 10%, gypsum 5%, calcining coal gangue 5%;
(c) the 3rd group: commercial lime 20%, magnesia 50%, tricalcium aluminate 20%, gypsum 10%;
(d) the 4th group: tricalcium aluminate 50%, gypsum 35%, natural alumstone 10%, calcining coal gangue 5%;
(3) the road bed place punching beyond the shoulder 60cm of distance old road.The method of static pressure is adopted vertically to be squeezed in soil by the tubular apparatus of termination with unidirectional block device by machine.The punching degree of depth is 10m, and aperture is 100mm.Adopt triangle pattern, pitch-row 60cm punches successively, as Fig. 3.
(4) first group to the 4th group expanding material cylindrical piece is often organized five pieces in order to fill in successively in hole, with tamping machine compacting, tamp after continuing to fill out 1 meter with rendzinas, remaining hole length tamps by new roadbed material.
Embodiment five:
Certain highway widening engineering, in side, old road, excavation widens 2 meters, within after work three months, there is microcrack due to relative settlement, know according to exploration report: engineering ground top layer is changed and filled out 2.5 meters of void ratios is 0.57, the section of widening less than 2.5 meters 5 meters is mouldable state silty clay ground, and void ratio gradually becomes 0.7 by 0.6 from top to bottom; The lower 2.5 meters of void ratios in old road are that less than 0.55,2.5 meters 5 meters of void ratios gradually become 0.65 by 0.57 from top to bottom.
(1) selection expanding material constituent mass percent is: commercial lime (is calcined 15 hours for 900 DEG C, wherein quicklime content accounts for 20%) 40%, magnesia (calcining heat 800 DEG C, calcination time 8 hours, light calcined magnesia content accounts for 32%) 50%, flyash 10%; Wherein the particle diameter of magnesia, commercial lime is less than 10mm, and powder containing quantity is about 15%, and calcium oxide content is greater than 75%, and active oxidation content of magnesium is greater than 85%.
(2) lower punching is tilted at gutter place, new widening road side.Wherein inclination angle and vertical direction are 30 degree, and the vertical degree of depth of punching is 7m, and aperture is 80mm, and pitch-row 1m is override interrupt successively.
(3), when filling expanding material, by there being the pipe of end block to squeeze into after at the bottom of hole, in pipe, add expanding material, the round bar being slightly less than bore with diameter, by expanding material dense extrusion, makes compactness reach more than 95%.Pipe is taken out outside extruding round bar limit in limit, until filled out by expanding material apart from 1m place, aperture, then no longer sinks to expanding material with small-sized hammer ram rammer, finally to be bound in aperture with rendzinas and tamps.
Claims (4)
1. utilize expanding material accurately to regulate and control the method for processing foundation of new and old roadbed relative settlement, it is characterized in that: comprise the steps:
The first step, determines the porosity difference of old road ground and Xin Lu ground;
Second step, determines according to porosity difference desired depth of punching;
The degree of depth that described desired depth Shi Xin road ground and the void ratio difference of old road ground are less than 2%;
3rd step, draws the expanding material content needed for predetermined segment of hole depth according to the expansion rate of expanding material and porosity mathematic interpolation;
Described expanding material comprises expansion component and filling components, and wherein expansion component accounts for the mass percent of whole expanding material is 60% ~ 100%, and all the other are filling components;
Described expansion component has following three classes:
(1) calcining obtains commercial lime, comprises quicklime, or Extend position, or both combinations;
(2) calcine the magnesia obtained, comprise dead burned magnesia, light calcined magnesia or both combinations, its active oxidation content of magnesium accounts for more than 75%; Described magnesia calcining heat is 800 DEG C ~ 1450 DEG C, temperature retention time 1 ~ 8 hour;
(3) combination of materials of calcium sulphoaluminate class can be generated, namely can generate calcium sulphoaluminate after various ingredients reaction;
Described filling components is containing active silica, the industrial residue of active oxidation aluminium component or natural materials, includes but not limited to flyash, slag, calcining coal gangue, slag; Filling components particle diameter is less than 80 μm;
4th step, new road ground punches to desired depth, in described hole, adds expanding material, and by expanding material compacting; On described punching Shi Xin road ground straight down or be tilted to lower punching, the angle of angle of inclination and plumb line is 5 ~ 30 degree;
5th step, make the volume of expanding material that controlled slow expansion occur by the component adjusting expanding material, reaction between each component of expanding material and between expanding material and water in soil, expanding material progressively slowly expands, even extruding surrounding soil, reach the effect that discharging consolidation reduces new road ground porosity, final Shi Xin road ground hole reduction reaches design object value.
2. a kind of method for processing foundation utilizing expanding material accurately to regulate and control new and old roadbed relative settlement according to claim 1, it is characterized in that: generate calcium sulphoaluminate after described various ingredients reaction, described various ingredients includes but not limited to that sulphate aluminium cement adds gypsum; Or for high alumina cement adds gypsum; Or add gypsum for aquation aluminic acid four calcium; Or for tricalcium aluminate adds gypsum; Or add gypsum for aluminum sulfate adds lime; Or for calcined alunite adds gypsum, or add gypsum for natural alumstone.
3. a kind of method for processing foundation utilizing expanding material accurately to regulate and control new and old roadbed relative settlement according to claim 1, is characterized in that: described one expanding material compacting specifically adopted in following three kinds of methods:
A () to implant in soil after desired depth by there being the pipe of the unidirectional block in end, add expanding material, be less than the round bar of bore by expanding material dense extrusion with diameter in pipe; Limit extruding round bar, while take out outer for pipe; Take out pipe amplitude to be advisable without the whole volume of pore section can fill after the expanding material compacting added; Repeat said process, until the hole section of intending filling out expanding material all fills up expanding material and compacting is as the criterion; Then envelope is filled out in aperture;
B expanding material is inserted in mould by (), be pressed into the expanding material cylindrical piece of specifying degree of compaction with forcing press; Expanding material cylindrical piece is filled in successively also compacting in hole, then envelope is filled out in aperture; Described mould diameter is less than pore-forming pipe external diameter 1-10mm, length is less than hole depth;
C () adds expanding material by there being the pipe of the unidirectional block in end to implant in soil after desired depth in pipe, be less than the round bar of bore by expanding material compacting with diameter; Then round bar is rammed expanding material and is made expanding material squeezed in the soil body towards periphery, and limit is filled expanding material limit and rammed, and pipe is outwards taken out in limit; Repeat above-mentioned steps, all fill up to the hole section intending filling expanding material, make expanding material squeezed formation in soil be greater than the column of hole pipe diameter.
4. a kind of method for processing foundation utilizing expanding material accurately to regulate and control new and old roadbed relative settlement according to claim 1, is characterized in that: the aperture in described hole is between 7cm ~ 30cm.
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| CN108491599B (en) * | 2018-03-09 | 2021-12-14 | 中国铁道科学研究院铁道建筑研究所 | Method for evaluating expansibility of mixed filler for railway roadbed |
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| CN2501908Y (en) * | 2000-06-14 | 2002-07-24 | 荆学松 | High earth-filled road-bed stage back capable of preventing vehicle vibration on bridge head |
| CN201187052Y (en) * | 2008-03-12 | 2009-01-28 | 天津市建筑科学研究院 | Precast pile for reinforcing soft foundation |
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