CN100480470C - Soft foundation processing method for rapidly eliminating differential settlement - Google Patents
Soft foundation processing method for rapidly eliminating differential settlement Download PDFInfo
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- CN100480470C CN100480470C CNB2006100977055A CN200610097705A CN100480470C CN 100480470 C CN100480470 C CN 100480470C CN B2006100977055 A CNB2006100977055 A CN B2006100977055A CN 200610097705 A CN200610097705 A CN 200610097705A CN 100480470 C CN100480470 C CN 100480470C
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Abstract
The invention discloses a soft foundation treatment to eliminating non-uniform sedimentation, and it is characterized by: firstly dividing built-up area exactly according the data which is obtained by the rapid exploration means on site and the calculated settlement; using the fast dynamic dewatering consolidation process to forming a hard shell with certain thickness and high density on the soil layer in the dealing category. Its beneficial effects are: it eliminates non-uniform sedimentation in different parts of one field basically during the process of soft foundation construction, ensures the non-uniform sedimentation of ground foundation completed rapidly in construction period, prevents the engineering problems such as the ground deformation, buildings cracking caused by difference sedimentation after construction period.
Description
Technical field:
The present invention relates to a kind of building has the Soft Ground of requirement to the differential settlement (relative settlement) of place foundation soil, especially changes greatly at the place formation condition, the soft foundation processing method of building quick elimination differential settlement when very responsive to differential settlement.
Background technology:
The soft soil foundation processing method of eliminating the foundation soil uniform settlement fast has good prospects for application.Each island of the China and even the world and coastal state are used for economic construction in order to develop land resources, thousands of hectares of all will reclaiming fields from the sea every year.These new soil building ground are on various all kinds of landform and the primary deposit condition, the character of weak soil and thickness, and character and thickness and the method for reclaiming fields from the sea of filling out (blowing) soil make same making on the place, ground to have tangible lithology difference and settlement difference.In large-scale Soft Ground, differential settlement how to eliminate foundation soil in the Soft Ground process fast is the problem that all kinds of ground treatment construction methods all will be faced.In a large amount of subgrade treatment project of in the past finishing, the excessive big factors that causes engineering accident often of differential settlement, foundation soil differential settlement situation have become the primary condition of estimating the ground treatment effect simultaneously.Therefore the soft foundation processing method of eliminating the foundation soil differential settlement fast has crucial Technological Economy effectiveness and good prospects for application.In the soft foundation processing method of conventional employing at present, all to have the bulk subregion in mind and handle, when handling at the large tracts of land subgrade as vacuum preloading, vacuum preloading-piling prepressing, piling prepressing, its subregion area is 10000m
2-25000m
2, the subregion area of Dynamic Drainage Consolidation Method is 4000m
2-10000m
2, for the part and the notable difference of the foundation soil condition that exists among a small circle fail to treat respectively and often cause the generation of relative settlement behind the worker; In addition in settlement calculation with to finish predicted settlement by construction processing be prerequisite with total settlement or average settlement amount all, and ignored inhomogeneous (difference) sedimentation in different locations, cause attention to be focused on during constructure scheme and finish on total consolidation settlement or the average settlement amount in establishment, and after inhomogeneous (difference) sedimentation has been left to the worker.This inhomogeneous (difference) sedimentation has brought many engineering accidents for the use of building.As ground cracking, distortion, construction wall cracking etc.A kind of brand-new effective soft foundation processing method that the present invention invents in order to make ground handle the back above-mentioned engineering accident of unlikely generation just.Current tackling prevents settlement after construction resourcefulness excessive and the elimination differential settlement to adopt the prolongation squeeze time, the consolidation settlement of soft layer finished in construction, thereby made very long, cost increase of duration.
Summary of the invention:
The purpose of this invention is to provide a kind of usefulness and solve the differential settlement of handling different locations, place of basic elimination in the work progress at subgrade, guarantee that the differential settlement of foundation soil finishes fast in the construction period, prevent to produce relative settlement behind the worker and the soft foundation processing method that causes the quick elimination differential settlement of engineering problems such as ground deformation, construction cracking.
Technical solution of the present invention is: a kind of soft foundation processing method of quick elimination differential settlement is characterized in that: at first adopt the settling amount of data that on-the-spot prospecting means fast obtain and the calculating sub-district of accurately constructing to divide; Adopt quick dynamic water-drainage consolidation technology, the soil layer in process range forms the crust layer with certain thickness and highly dense solidity.
Scene prospecting means fast described in the present invention are that manual probing, static sounding and/or four-bladed vane are sheared.The calculating of the settling amount that will carry out respectively different subregions is the foundation soil settling amount that calculates whole audience ground according to geological mapping data, place backfill height, foundation treatment technology requirement.Ground is handled and is adopted quick dynamic water-drainage consolidation technology.The differential settlement of each subregion is finished in work progress fast.Ground is handled the soil layer of back in process range and is formed the crust layer with setting thickness and highly dense solidity.Reach the construction settling amount of design at each subregion after, guarantee the crust layer thickness on ground top layer and the uniformity of intensity by full rammer, layered rolling: carry out the maintenance of stopping in 3 ~ 4 weeks after the ground processing finishes.
Beneficial effect of the present invention is: solve at subgrade and handle the basic differential settlement of eliminating different locations, a place in the work progress, guarantee that the differential settlement of foundation soil finishes fast in the construction period, prevent to produce relative settlement behind the worker and cause engineering problems such as ground deformation, construction cracking.
The present invention is described in further detail below in conjunction with drawings and Examples:
Description of drawings:
Fig. 1 is the subregion settlement amount after construction computational chart of the soft foundation processing method of a kind of quick elimination differential settlement of the present invention;
Fig. 2 is the basic model figure of the soft foundation processing method of quick elimination differential settlement of the present invention.
The specific embodiment:
Fig. 1, Fig. 2 have described embodiments of the invention jointly.
The present invention includes: 1) detailed formation condition research and analysis; 2) accurate whole audience ground settling amount calculating; 3) partition scheme design; 4) overall process information-aided construction; 5) crust layer counter stress diffusion mechanism is used to eliminate settlement after construction.
Technical solution of the present invention is:
Require to calculate the foundation soil settling amount on whole audience ground according to geological mapping data, place backfill height, foundation treatment technology, analyze the differential settlement situation: require and shallow-layer prospecting (hand drill, static sounding etc.) data is carried out foundation soil and handled subregion according to settlement after construction. the construction settling amount that should finish by definite each subregion of settlement amount after construction requirement.
Eliminating the accurate partition size of the soft foundation processing method of differential settlement does not fast have certain area regulation, decides on the inhomogeneities of processed district foundation soil, and its area can be greater than 10000m
2, also can be less than 1000m
2Accurately subregion should design and adopt different drainings and dynamic consolidation parameter to each subregion: accurately the design and construction of subregion will form the crust layer of a highly dense solidity by construction, makes it can produce behind the worker effective stress diffusion.
Design the construction technology parameter of each sub-district by the construction settling amount that should finish. comprise quick squeeze time, the gutter degree of depth and spacing, ramming can size, spacing and respectively ram clicks, draining and ram pass and compactness etc.Guarantee that settlement after construction reaches the crust layer thickness and the intensity of designing requirement.
The constructure scheme organizing construction of drafting by the construction technology parameter.
Strictly in the work progress undertaken whenever by information-aided construction, and according to this reasonability of the construction parameter of design is assessed and adjusted all over effect detection between the dynamic water-drainage consolidation and settling amount metering.
After the construction settling amount of each sub-district reached designing requirement, the compactness of emphasis control superficial part foundation soil guaranteed that the intensity of crust layer reaches designing requirement.
The soft foundation processing method of eliminating fast differential settlement is applicable to be handled the subgrade of the tighter advanced road engineering of settlement after construction and relative settlement, large tracts of land stockyard engineering, harbour engineering, storage engineering, lightweight structures and steel work factory room engineering, can effectively overcome uneven subsidence behind the worker who is difficult to solve in piling prepressing, vacuum preloading, the vacuum-conventional soft foundation processing methods such as preloading joint preloading.
Eliminate fast the soft foundation processing method of differential settlement owing to be to be controlled at construction period to eliminate the relative settlement in place by the people, for structure design and build, structure safe handlings provides guarantee, can prevent to cause the many bad problem and the accident of construction work generation, have obvious social and economic benefit because of relative settlement.
Basic model figure with reference to the soft foundation processing method of the quick elimination differential settlement of Fig. 2:
For the uneven strata shown in the figure, settlement after construction requires to be all Sf, but thickness of soft soil is different with fill stratum thickness, it is also different to calculate settling amount, the calculating settling amount in three districts of example is respectively S1, S2, S3, and S1 is arranged〉S2〉S3, in order to satisfy the requirement of settlement amount after construction Sf, the settling amount that need finish separately in the work progress is respectively S, S2, S3, and S1 is promptly arranged〉S2〉S3.Just, adopt different construction parameters to finish different construction settling amounts, finally reach the settlement after construction unanimity, the purpose that relative settlement meets design requirement for different locations.Simultaneously, utilize the thickness difference of banketing in each district, as H1〉H2〉H3, hit closely by the construction of adopting different parameters, can form the crust layer of different-stiffness and thickness.Its rigidity and thickness separately of formed crust layer is respectively Es1, H1, Es2, H2 and Es3, H3, and make it to satisfy concern H1Es1 H2Es2 H3Es3, wherein the product of crust layer thickness and rigidity is called crust layer stress diffusion coefficient, crust layer stress diffusion coefficient is big more, its stress diffusion is also obvious more, and residual settlement and 3 districts are basic identical behind 1 district that the final feasible soil layer that underlies is relatively poor and the worker in 2 districts.
Make each different district of settling amount reach essentially identical settlement after construction value in order to make because of formation condition is different, different subregions will adopt different spacing of prefabricated drain and the degree of depth, different squeeze time, different intubate precipitation depth and spacing, different ramming energy and ram pass.Generally speaking, plastic draining board length 1 district〉2 districts〉3 districts, spacing 1 district＜2 districts＜3 districts, squeeze time 1 district〉2 districts〉3 districts, ram pass 1 district〉2 districts〉3 districts.Analyze existing place prospecting data, propose the principal element of the issuable differential settlement in place; Carry out on-site manual probing, static sounding or vane shear test, the degree of reliability of checking exploration report and enforcement are to the accurate division of superficial part (more than the 10m) soft soil layer; Utilize the prospecting data to carry out service load and the load action foundation settlement down that bankets calculates the analysis place sedimentation characteristics and the differential settlement opposite sex; By the settlement amount after construction requirement subregion of accurately constructing, the foundation soil settling amount that the sub-district of determining respectively to construct should be finished in construction period; Design the construction parameter of the sub-district of respectively constructing, comprise the quick precompressed degree of depth and time, drainage type, the degree of depth, spacing, the energy of dynamic consolidation, grid spacing and every clicks, the dynamic water-drainage consolidation pass, the laying of settlement observation net and observation requirement, on-the-spot test item and requirement etc.; Require the thickness and the compactness of design crust layer in conjunction with bearing capacity and settlement amount after construction by the stable checking computations of substratum; Adopt quick dynamic water-drainage consolidation (comprising that initiatively vacuum-dewatering rams worker's methods such as short distance overload vacuum precompression+precipitation rams by force, low level precipitating, pre-pressing and strong tamping, dynamic replacement by force) to construct by design parameters and crust layer thickness; On-the-spot quality examination is implemented in full work progress, and revise the construction parameter of design at any time, make parameters reach optimization, thereby reach the information-aided construction management of overall process by the detection data; Reach the construction settling amount of design at each subregion after, guarantee the crust layer thickness on ground top layer and the uniformity of intensity by full rammer, layered rolling; Carry out the maintenance of stopping in 3～4 weeks after the ground processing finishes, be strictly on guard against that disturbance destroys.
Claims (6)
1, a kind of soft foundation processing method of quick elimination differential settlement is characterized in that: at first adopt the settling amount of data that on-the-spot prospecting means fast obtain and the calculating sub-district of accurately constructing to divide; Adopt quick dynamic water-drainage consolidation technology, the soil layer in process range forms the crust layer with certain thickness and highly dense solidity.
2, the soft foundation processing method of quick elimination differential settlement according to claim 1 is characterized in that: scene prospecting means fast are that manual probing, static sounding and/or four-bladed vane are sheared.
3, the soft foundation processing method of quick elimination differential settlement according to claim 1 and 2, it is characterized in that: the calculating of the settling amount that will carry out respectively different subregions is the foundation soil settling amount that calculates whole audience ground according to geological mapping data, place backfill height, foundation treatment technology requirement.
4, the soft foundation processing method of quick elimination differential settlement according to claim 3 is characterized in that: ground is handled and is adopted quick dynamic water-drainage consolidation technology, and the differential settlement of each subregion is finished in work progress fast.
5, the soft foundation processing method of quick elimination differential settlement according to claim 4 is characterized in that: ground is handled the soil layer of back in process range and is formed the crust layer with setting thickness and highly dense solidity.
6, the soft foundation processing method of quick elimination differential settlement according to claim 1 and 2 is characterized in that: reach the construction settling amount of design at each subregion after, guarantee the crust layer thickness on ground top layer and the uniformity of intensity by full rammer, layered rolling; After finishing, the ground processing carries out the maintenance of stopping in 3～4 weeks.
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| CN103195047B (en) * | 2013-04-18 | 2014-12-24 | 浙江大学 | Treatment method for reducing settlement of soft soil foundation |
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