CN104563128B - The asymmetric deep big foundation pit in soft clay area synchronizes support system and the implementation of excavation - Google Patents
The asymmetric deep big foundation pit in soft clay area synchronizes support system and the implementation of excavation Download PDFInfo
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- CN104563128B CN104563128B CN201410822622.2A CN201410822622A CN104563128B CN 104563128 B CN104563128 B CN 104563128B CN 201410822622 A CN201410822622 A CN 201410822622A CN 104563128 B CN104563128 B CN 104563128B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
nullThe invention discloses the asymmetric deep big foundation pit in a kind of soft clay area and synchronize excavation supporting system and implementation，The deep district that asymmetric deep big foundation pit is close to by inside forms with shallow district，Deeply、The substrate in a height of shallow district of top mark of Qian Liang district intersection building enclosure，Full foundation ditch is unified arranges first horizontal support，If deep district sets up deep district, arterial highway horizontal support，If reserving one for balancing the soil body platform of deep district, the described arterial highway horizontal power transmission of horizontal support at shallow district Nei Yushen district intersection，The Fang Pozhiqian district substrate of soil body platform both sides，Thus realize deep、The open cut of Qian Liang district is along building synchronous construction，Solve owing to function needs cause the asymmetric foundation ditch internal force caused of digging mode and deform unbalanced problem，Guarantee that the excavation of asymmetric foundation ditch realizes safety、Reliably、Economical、Environmental protection，Deeply、Qian Liang district synchronizes excavation can effective reduction of erection time、Reduce construction cost，And support system stress is clear and definite，The horizontal force of each road horizontal support set up in deep district obtains reliable delivery，Construction feasibility is good.
Description
Technical field
The present invention relates to geotechnical engineering design and construction field, especially for the Large Unsymmetric deep-foundation pit engineering in deep & thick silt matter soft soil layer synchronize excavation construction period under New Supporting system and implementation.
Background technology
In recent years, during to soft clay area urban underground space comprehensive development project, owing to utilizing the difference of the degree of depth, occur in that the asymmetric deep big foundation pit that a lot of inner excavation degree of depth is inconsistent.Before, for building enclosure deformation character in excavation of foundation pit Precipitation Process and cause the research of environmental effect to be all based on greatly the consistent symmetrical foundation ditch of cutting depth to launch, but the stressing conditions foundation ditch common with deformation effect geometric ratio of asymmetric foundation pit supporting system different parts will be much more complex.
The asymmetric deep big foundation pit in soft clay area is often located in business district, and surrounding enviroment are complicated, even next-door neighbour river course or subway；Stratum essentially saturated aqueous stream is moulded or soft plastic clay layer, and hole when compressibility is big, shearing strength is low, highly sensitive；And foundation ditch is in irregular shape, single central island-type or benzvalene form earth excavation scheme are more difficult applicable, although using against making earthwork tunneling safe and reliable when the duration is urgent, but high cost.
At present, the excavation of asymmetric deep big foundation pit, mainly use the deepest rear shallow subregion independent construction method, be not carried out district deep, shallow and synchronize excavation construction, construction period is long, and construction cost is the highest.
Therefore, it is necessary to the mentality of designing of such deep big foundation pit of exploratory development and construction method, to reaching purpose safe, reasonable, economic, efficient.
Summary of the invention
It is an object of the invention to provide the asymmetric deep big foundation pit in a kind of soft clay area and synchronize excavation supporting system and implementation; first horizontal support is arranged by full foundation ditch is unified; if deep district sets up arterial highway deep district horizontal support and the support pattern of intersection remaining soils platform; solve owing to function needs cause the asymmetric foundation ditch internal force caused of digging mode and deform unbalanced problem; guarantee safe and reliable, the economy of excavation of foundation pit, environmental protection; realize schedule requirement deep, that Qian Liang district synchronizes excavation; the effectively reduction of erection time, reduce construction cost.
For solving above-mentioned technical problem, the present invention provides following technical scheme:
The asymmetric deep big foundation pit in a kind of soft clay area synchronizes excavation supporting system, the deep district that described asymmetric deep big foundation pit is close to by inside forms with shallow district, deeply, the substrate in a height of described shallow district of top mark of Qian Liang district intersection building enclosure, full foundation ditch is unified arranges first horizontal support, if deep district sets up deep district, arterial highway horizontal support, if reserve the soil body platform of deep district, an arterial highway horizontal power transmission of horizontal support set up in balancing described deep district at shallow district Nei Yushen district intersection, described soil body platform both sides Fang Pozhiqian district substrate, thus realize deep, the open cut of Qian Liang district is along building synchronous construction.
Preferably, described deep, Qian Liang district cutting depth is respectively 8-20m and 3-7m.
Preferably, the width of described soil body platform is not preferably less than four times of shallow district cutting depth.
Preferably, the slope lift height of putting of described soil body platform is not more than 4m, it is layered in easy flights in 1:2.0, domatic and platform surface all uses more than or equal to the C20 concrete topping bank protection setting φ 6@200 two-way concrete slab net in 50 thickness, and the most domatic φ 12 joint bar that the adjacent spacing of long 1m is not more than 1m is set, unreceipted unit is mm.
Preferably, the light-duty precipitation well point for improving soil strength is arranged on the top, slope of described soil body platform.
Preferably, if deep district, the described arterial highway horizontal support set up in described first horizontal support and deep district all uses armored concrete horizontal support, if deep district, the described arterial highway horizontal support that described first horizontal support is set up with deep district in all uses supportting, angle brace is combined the arrangement form of fringe truss.
Preferably, foundation ditch uses campshed fender body or diaphram wall as periphery and intersection building enclosure.
The invention also discloses the asymmetric deep big foundation pit in a kind of soft clay area and synchronize excavation implementation, use the asymmetric deep big foundation pit in soft clay area as above to synchronize excavation supporting system, comprise the steps:
Operating mode one, levelling of the land, carries out building enclosure, stand column pile and Construction of Engineering Pile；
Operating mode two, full foundation ditch top layer excavation, unification pours first horizontal support；
Operating mode three, deep district and shallow district start simultaneously at and carry out earth excavation, if shallow district Nei Yushen district intersection reserves the soil body platform of deep district, the arterial highway of the subsequent construction horizontal power transmission of horizontal support, a described soil body platform both sides Fang Pozhiqian district substrate in balancing deep district；
Operating mode four, if deep district, arterial highway horizontal support described in stage excavation pouring construction in deep district；Meanwhile, in shallow district, area dividing in addition to soil body platform excavates and pours sole plate and support replacement；
Operating mode five, is excavated to substrate pouring construction sole plate and support replacement in deep district, continue excavation construction except soil body platform is with the underground structure of exterior domain in shallow district；
Operating mode six, the underground structure after removing described deep district, arterial highway horizontal support if deep district has progressively constructed, in shallow district, soil body platform region piecemeal carries out earth excavation and pours sole plate in time；
Operating mode seven, deep district continues construction underground structure, deep, Qian Liang district intersection underground structure connection, shallow district excavation remaining area to substrate pouring construction sole plate and support replacement；
Operating mode eight, removes first horizontal support in foundation ditch, whole underground structure of having constructed.
Preferably, according to classical earth pressure theory, Vertical elastic foundation beam method often walks excavation to foundation ditch, support sets up and tears open under support operating mode Internal force of support structure, deformation and stability is used to carry out computational analysis；The tunneling boring simultaneously using method district deep to foundation ditch, the shallow intersection of numerical analysis carries out secondary analog, and binding isotherm calculates and adjusts supporting parameter, optimization design, to determine that staying of soil body platform during foundation pit construction sets the situation of change of the deformation effect to supporting construction and surrounding, and then every monitoring standard is proposed.
Preferably, the slope toplap of excavation stage soil body platform carries limit value 20kPa, it is desirable to reduces underground water position and gets rid of surface water, forbids that the aqueous reflux that surface water or foundation ditch are got rid of bleeds back into foundation ditch.
From techniques disclosed above scheme, compared with prior art, beneficial effects of the present invention is as follows:
The present invention solves the technical problem that the asymmetric deep big foundation pit engineering in background technology exists at aspects such as design, constructions, it is according to the geo-logical terrain feature of In Soft Muddy Soil Region, on the premise of satisfied synchronization excavation construction period, select science safety, the supporting design scheme of economical rationality targetedly, first horizontal support is arranged by full foundation ditch is unified, if deep district sets up arterial highway deep district horizontal support and the support pattern of intersection remaining soils platform, and use the construction method adapted therewith, specifically have the advantages that
(1) first horizontal support is arranged by full foundation ditch is unified; if deep district sets up arterial highway deep district horizontal support and the support pattern of intersection remaining soils platform; solve owing to function needs cause the asymmetric foundation ditch internal force caused of digging mode and deform unbalanced problem; foundation pit deformation is effectively controlled; surrounding enviroment protected effect is good, and the impact in Excavation Process produced peripheral path, pipeline and building is the least.
(2) first horizontal support is arranged by full foundation ditch is unified, if deep district sets up arterial highway deep district horizontal support and the support pattern of intersection remaining soils platform, deep, Qian Liang district synchronization excavation can be realized, it is effectively shortened the duration of a project, substantially increase efficiency of construction, also reduce technical measures expense, it is achieved that the maximization of economic benefit.
(3) by Nei Yushen district of shallow district intersection remaining soils platform, if the horizontal force of deep district, the arterial highway horizontal support set up in can ensure that deep district obtains reliable delivery, support system stress is clear and definite, construction feasibility, operability are good, and the adaptability that soft stratum is similar to base pit engineering is stronger.
(4) due to can be with synchronous construction, the agent structure of deep, Qian Liang district intersection can one-shot forming, it is to avoid staying of construction joint sets, the good integrity of permanent structure.
(5) foundation ditch uses campshed fender body or diaphram wall as periphery and intersection building enclosure, and construction technology is ripe, and steady quality, antiseep is respond well, and safety stock is reasonable.
Accompanying drawing explanation
Fig. 1 is the floor map of asymmetric deep big foundation pit in one embodiment of the invention；
Fig. 2 is that in one embodiment of the invention, asymmetric deep big foundation pit synchronizes that excavation supporting system is deep, the generalized section of Qian Liang district intersection；
Fig. 3 to Figure 10 is that in one embodiment of the invention, asymmetric deep big foundation pit synchronizes excavation implementation procedure of operating mode schematic diagram；
Figure 11 is the soft clay area clay distribution schematic diagram of one embodiment of the invention.
In figure: the deep district of 1-, the shallow district of 2-, 3-intersection building enclosure, 4-first horizontal support, 5-deep district horizontal support, 6-soil body platform, 7-periphery building enclosure, the light-duty precipitation well point of 8-, 9-base plate, 10-underground structure, 11-support replacement, 12-engineering pile, 13-stand column pile.
Detailed description of the invention
The soft clay area asymmetric deep big foundation pit synchronization excavation supporting system proposed the present invention below in conjunction with the drawings and specific embodiments is described in further detail.According to following explanation and claims, advantages and features of the invention will be apparent from.It should be noted that, accompanying drawing all uses the form simplified very much and all uses non-ratio accurately, only in order to facilitate, to aid in illustrating lucidly the purpose of the embodiment of the present invention.
The core concept of the present invention: after the unified formation full hole first horizontal struts system of cutting the earth in top layer, deep, Qian Liang district carries out earth excavation simultaneously；If by the horizontal power transmission reserving the soil body platform of enough width deep district, the arterial highway horizontal support to set up in balancing deep district at shallow district Nei Yushen district intersection, remaining scope piecemeal successively carries out excavation construction；If after deep district, the arterial highway horizontal support set up in deep district underground structure has progressively been constructed and removed deep district, then excavating the soil body platform of intersection and pour residue sole plate；Remove first horizontal support subsequently, complete whole Underground Construction；Solve owing to function needs cause the asymmetric foundation ditch internal force caused of digging mode and deform unbalanced problem, guarantee safe and reliable, the economy of asymmetric excavation of foundation pit, environmental protection, realize deep, the schedule requirement of Qian Liang district synchronous construction, effective reduction of erection time, reduce construction cost.
Refer to Fig. 1 to Figure 11, present embodiment discloses the asymmetric deep big foundation pit in a kind of soft clay area and synchronize excavation supporting system, described foundation ditch flat shape is irregular, overall in " ㄣ " shape, the deep district 1 that described foundation ditch is close to by inside forms with shallow district 2, deeply, Qian Liang district cutting depth can be respectively 8-20m and 3-7m, in the present embodiment, described deep district 1 is respectively 10m and 5m with the cutting depth in described shallow district 2.The substrate in a height of described shallow district 2 of top mark of described deep, Qian Liang district intersection building enclosure (i.e. for separating the intersection building enclosure 3 in deep district 1 and shallow district 2), full foundation ditch is unified arranges first horizontal support 4, if deep district 1 sets up deep district, arterial highway horizontal support 5, if reserve the soil body platform 6 of deep district, an arterial highway horizontal power transmission of horizontal support 5 set up in balancing deep district 1 at shallow district 2 Nei Yushen district 1 intersection, the substrate in the Fang Pozhiqian district, both sides 2 of described soil body platform 6, thus realize deep, Qian Liang district 1,2 open cut along building synchronous construction.Described some refer to together or together more than, in the present embodiment, at construction the deepest district of deep district 1 horizontal support, it is of course possible to construction twice even more multiple tracks deep district horizontal support as required.One aspect of the present invention; first horizontal support 4 is arranged by full foundation ditch is unified; if deep district 1 sets up deep district, arterial highway horizontal support 5 and shallow district 2 support pattern at intersection remaining soils platform 6; solve owing to function needs cause the asymmetric foundation ditch internal force caused of digging mode and deform unbalanced problem; foundation pit deformation is effectively controlled; surrounding enviroment protected effect is good, and the impact in Excavation Process produced peripheral path, pipeline and building is the least；On the other hand, first horizontal support 4 is arranged by full foundation ditch is unified, if deep district 1 sets up deep district, arterial highway horizontal support 5 and shallow district 2 support pattern at intersection remaining soils platform 6, deep, Qian Liang district 1,2 synchronization excavation can be realized, it is effectively shortened the duration of a project, substantially increase efficiency of construction, also reduce technical measures expense, it is achieved that the maximization of economic benefit；Another further aspect, due to can be with synchronous construction, the agent structure of deep, Qian Liang district 1,2 intersection can one-shot forming, it is to avoid staying of construction joint sets, the good integrity of permanent structure；Another aspect, by arranging soil body platform 6 at the intersection in Nei Yushen district of shallow district 21, if the horizontal force reliable delivery of deep district, the described arterial highway horizontal support 5 set up in can ensure that deep district 1, support system stress is clear and definite, construction feasibility, operability are all preferable, and the adaptability that soft stratum is similar to base pit engineering is stronger.
Preferably, the width of described soil body platform 6 is not less than 20000mm, if playing enough support forces with deep district, arterial highway horizontal support 5 described in deep district 1 is set up, effectively control the deformation size of foundation ditch in Excavation Process, alleviate the adverse effect that peripheral path, pipeline and building are produced by excavation of foundation pit.
Preferably, the slope lift height of putting of described soil body platform 6 is not more than 4m, it is layered in easy flights in 1:2.0, domatic and platform surface all uses more than or equal to the C20 concrete topping bank protection setting φ 6@200 two-way concrete slab net in 50 thickness, and the most domatic φ 12 joint bar that the adjacent spacing of long 1m is not more than 1m is set, unreceipted unit is mm.It is arranged such; can effectively protect soil body platform 6, prevent soil body platform 6 unstability, it is ensured that if deep district, arterial highway horizontal support 5 described in setting up deep district 1 reliably supports; thus effectively control foundation pit deformation, reduce the negative effect in Excavation Process, peripheral path, pipeline and building produced.
Preferably, the light-duty precipitation well point 8 for improving soil strength is arranged on the top, slope of described soil body platform 6, by arranging light-duty precipitation well point 8, can be effectively improved the intensity of described soil body platform 6, to set up the horizontal power transmission of horizontal support 5 in deep district is better balanced.
Preferably, if deep district, the described arterial highway horizontal support 5 set up in described first horizontal support 4 and deep district all uses armored concrete horizontal support, if deep district, the described arterial highway horizontal support 5 that described first horizontal support 4 is set up in deep district all uses, and support, angle brace are combined the arrangement form of fringe truss, not only easy construction, and there is good support effects.
Preferably, described foundation ditch uses campshed fender body or diaphram wall as periphery and intersection building enclosure 7,3, say, that for the periphery building enclosure 7 of foundation ditch surrounding and separate the intersection building enclosure 3 in deep district 1 and shallow district 2 and can use the form of campshed fender body or diaphram wall.In the present embodiment, described foundation ditch uses campshed fender body as periphery and intersection building enclosure 7,3.
Please continue to refer to Fig. 3 to Figure 10, and incorporated by reference to Fig. 1 and Fig. 2, the present embodiment also discloses the asymmetric deep big foundation pit in a kind of soft clay area and synchronizes excavation implementation, uses the asymmetric deep big foundation pit in soft clay area as above to synchronize excavation supporting system, and this implementation comprises the steps:
Operating mode one, please refer to Fig. 3 and Fig. 2 by emphasis, levelling of the land, carry out building enclosure, stand column pile 13 and engineering pile 12 and construct, described building enclosure includes the intersection building enclosure 3 for separating deep district 1 and shallow district 2 and the periphery building enclosure 7 of foundation ditch surrounding, operating mode one is this area routine techniques means, therefore do not repeat, Fig. 3 not illustrating, stand column pile 13 and engineering pile 12, following figure are similar to；
Operating mode two, please excavate refering to Fig. 4, full foundation ditch top layer by emphasis, and unification pours first horizontal support 4；
Operating mode three, please refer to Fig. 5 by emphasis, deep district 1 starts simultaneously at shallow district 2 and carries out earth excavation, if Nei Yushen district 1 of shallow district 2 intersection reserves the soil body platform 6 of deep district, the arterial highway horizontal power transmission of horizontal support 5 of subsequent construction, described soil body platform 6 both sides Fang Pozhiqian district 2 substrate in balancing deep district 1；
Operating mode four, please emphasis refering to Fig. 6, if deep district, arterial highway horizontal support 5 described in stage excavation pouring construction in deep district 1, meanwhile, in shallow district 2, the area dividing in addition to soil body platform 6 excavates and pours sole plate 9 and support replacement 11；
Operating mode five, please refer to Fig. 7 by emphasis, is excavated to substrate pouring construction sole plate 9 and support replacement 11 in deep district 1, continues excavation construction except soil body platform 6 is with the underground structure 10 of exterior domain in shallow district 2；
Operating mode six, please emphasis refering to Fig. 8, if deep district 1 progressively construct after deep district, arterial highway horizontal support 5 described in underground structure 10 dismounting, in shallow district 2, soil body platform 6 region piecemeal carries out earth excavation and pours sole plate 9 in time；
Operating mode seven, please emphasis refering to Fig. 9, deep district 1 continues construction underground structure 10, and deep, Qian Liang district 1,2 intersection underground structure 10 connects, and remaining area excavates to substrate pouring construction sole plate 9 and support replacement 11 in shallow district 2；
Operating mode eight, please refer to Figure 10 by emphasis, remove first horizontal support 4 in foundation ditch, whole underground structure 10 of having constructed.
Preferably, the slope toplap of excavation stage soil body platform 6 carries limit value 20kPa, it is desirable to reduces underground water position and gets rid of surface water, forbids that the aqueous reflux that surface water or foundation ditch are got rid of bleeds back into foundation ditch.
Preferably, according to classical earth pressure theory, Vertical elastic foundation beam method often walks excavation to foundation ditch, support sets up and tears open under support operating mode Internal force of support structure, deformation and stability is used to carry out computational analysis；The tunneling boring simultaneously using method district deep to foundation ditch, shallow 1,2 intersection of numerical analysis carries out secondary analog, and binding isotherm calculates and adjusts supporting parameter, optimization design, to determine that staying of soil body platform during foundation pit construction sets the situation of change of the deformation effect to supporting construction and surrounding, and then every monitoring standard is proposed.
In the present embodiment, as shown in figure 11, design of foundation pit parameter list is as shown in table 1 for the clay distribution situation of soft clay area, foundation ditch place:
Table 1 design of foundation pit parameter list
The key horizon situation related in excavation of foundation pit depth bounds is described as follows:
1. 1. layer miscellaneous fill, can be divided into11. layer bankets and2Layer creek bankets, 1.1Layer bankets and is generally distributed, and the loose inequality of soil property, containing plant roots and stems, rubble, fragment of brick, concrete block etc., based on cohesive soil；①2Layer creek bankets, and is distributed in dark creek region, and based on cohesive soil, containing plant roots and stems, rubble, fragment of brick, concrete block etc., bottom contains a large amount of creek bottom silts, and soil property is loose, uneven.
2. the brown Huang of layer～lark silty clay, plastic-soft moulds, middle compressibility, containing oxidation iron speck point and ferrum manganese concretion, increases soil property with the degree of depth the softest.The most smooth, dry strength is medium, and toughness is medium.
③1Layer Lycoperdon polymorphum Vitt very soft sill clay, stream moulds, high-compressibility, containing Muscovitum, presss from both sides thin layer silty soil.The most smooth, dry strength is medium, and toughness is medium.
③2Layer Lycoperdon polymorphum Vitt dauk, the closeest, middle compressibility, containing Muscovitum, presss from both sides thin layer cohesive soil.Shake is swift in response, and dry strength is low, and toughness is low.
③3Layer Lycoperdon polymorphum Vitt very soft sill clay, stream moulds, high-compressibility, containing Muscovitum, presss from both sides thin layer silty soil.The most smooth, dry strength is medium, and toughness is medium.
4. layer Lycoperdon polymorphum Vitt silt clay, stream moulds, high-compressibility, containing Muscovitum, shell, folder thin layer and lumps silty soil.Tangent plane is smooth, and dry strength is high, and toughness is high.
⑤1-1Layer gray clay, soft moulds, high-compressibility, containing Muscovitum, mud calcareous concretion, organic matter, presss from both sides thin layer silty soil.Tangent plane is smooth, and dry strength is high, and toughness is high.
⑤1-2Layer Lycoperdon polymorphum Vitt silty clay, soft moulds, high-compressibility, containing Muscovitum, mud calcareous concretion, organic matter, presss from both sides thin layer silty soil.Tangent plane is smooth, and dry strength is high, and toughness is medium.
In sum, the present invention is according to the geo-logical terrain feature of In Soft Muddy Soil Region, on the premise of meeting synchronous construction construction period, select science safety targetedly, the supporting design scheme of economical rationality, on the one hand, first horizontal support is arranged by full foundation ditch is unified, if deep district sets up arterial highway deep district horizontal support and the support pattern of intersection remaining soils platform, and use the construction method adapted therewith, solve owing to function needs cause the asymmetric foundation ditch internal force caused of digging mode and deform unbalanced problem, foundation pit deformation is effectively controlled, surrounding enviroment protected effect is good, to peripheral path in Excavation Process, the impact that pipeline and building produce is the least；On the other hand, first horizontal support is arranged by full foundation ditch is unified, if deep district sets up arterial highway deep district horizontal support and the support pattern of intersection remaining soils platform, deep, Qian Liang district synchronization excavation can be realized, it is effectively shortened the duration of a project, substantially increase efficiency of construction, also reduce technical measures expense, it is achieved that the maximization of economic benefit；Another further aspect, due to can be with synchronous construction, the agent structure of district deep, shallow intersection can one-shot forming, it is to avoid staying of construction joint sets, the good integrity of permanent structure；Another aspect, by arranging soil body platform at the intersection in Nei Yushen district of shallow district, if the horizontal force reliable delivery of deep district, the described arterial highway horizontal support set up in can ensure that deep district, support system stress is clear and definite, construction feasibility, operability are all preferable, and the adaptability that soft stratum is similar to base pit engineering is stronger.Additionally, Construction Technology of Retaining Structure is ripe, steady quality, antiseep is respond well, and safety stock is reasonable.In a word, present invention can assure that the synchronization excavation of the asymmetric deep big foundation pit in soft clay area realizes safe and reliable, economy, environmental protection.
Foregoing description is only the description to present pre-ferred embodiments, not any restriction to the scope of the invention, any change that the those of ordinary skill in field of the present invention does according to the disclosure above content, modification, belongs to the protection domain of claims.
Claims (8)
1. the asymmetric deep big foundation pit in soft clay area synchronizes excavation supporting system, it is characterized in that, the deep district that described asymmetric deep big foundation pit is close to by inside forms with shallow district, deeply, the substrate in a height of described shallow district of top mark of Qian Liang district intersection building enclosure, full foundation ditch is unified arranges first horizontal support, if deep district sets up deep district, arterial highway horizontal support, if reserve the soil body platform of deep district, an arterial highway horizontal power transmission of horizontal support set up in balancing described deep district at shallow district Nei Yushen district intersection, described soil body platform both sides Fang Pozhiqian district substrate, thus realize deep, the open cut of Qian Liang district is along building synchronous construction, described deeply, Qian Liang district cutting depth is respectively 8-20m and 3-7m, the width of described soil body platform is not less than four times of shallow district cutting depth.
2. the asymmetric deep big foundation pit in soft clay area as claimed in claim 1 synchronizes excavation supporting system, it is characterised in that the slope lift height of putting of described soil body platform is not more than 4m, is layered in easy flights in 1:2.0；Domatic and platform surface all uses more than or equal to the C20 concrete topping bank protection setting φ 6@200 two-way concrete slab net in 50 thickness, and the most domatic arranges φ 12 joint bar that the adjacent spacing of long 1m is not more than 1m, and unreceipted unit is mm.
3. the asymmetric deep big foundation pit in soft clay area as claimed in claim 1 synchronizes excavation supporting system, it is characterised in that the light-duty precipitation well point for improving soil strength is arranged on the top, slope of described soil body platform.
4. the asymmetric deep big foundation pit in soft clay area as claimed in claim 1 synchronizes excavation supporting system, it is characterized in that, if deep district, the described arterial highway horizontal support set up in described first horizontal support and deep district all uses armored concrete horizontal support, if deep district, the described arterial highway horizontal support that described first horizontal support is set up with deep district in all uses supportting, angle brace is combined the arrangement form of fringe truss.
5. the asymmetric deep big foundation pit in soft clay area as claimed in claim 1 synchronizes excavation supporting system, it is characterised in that described foundation ditch uses campshed fender body or diaphram wall as periphery and intersection building enclosure.
6. the asymmetric deep big foundation pit in soft clay area synchronizes excavation implementation, it is characterised in that uses the asymmetric deep big foundation pit in soft clay area as described in any one in claim 1-5 to synchronize excavation supporting system, comprises the steps:
Step one, levelling of the land, carries out building enclosure, stand column pile and Construction of Engineering Pile；
Step 2, full foundation ditch top layer excavation, unification pours first horizontal support；
Step 3, deep district and shallow district start simultaneously at and carry out earth excavation, if shallow district Nei Yushen district intersection reserves the soil body platform of deep district, the arterial highway of the subsequent construction horizontal power transmission of horizontal support, a described soil body platform both sides Fang Pozhiqian district substrate in balancing deep district；
Step 4, if deep district, arterial highway horizontal support described in stage excavation pouring construction in deep district；Meanwhile, in shallow district, area dividing in addition to soil body platform excavates and pours sole plate and support replacement；
Step 5, is excavated to substrate pouring construction sole plate and support replacement in deep district, continue excavation construction except soil body platform is with the underground structure of exterior domain in shallow district；
Step 6, the underground structure after removing described deep district, arterial highway horizontal support if deep district has progressively constructed, in shallow district, soil body platform region piecemeal carries out earth excavation and pours sole plate in time；
Step 7, deep district continues construction underground structure, deep, Qian Liang district intersection underground structure connection, shallow district excavation remaining area to substrate pouring construction sole plate and support replacement；
Step 8, removes first horizontal support in foundation ditch, whole underground structure of having constructed.
7. the asymmetric deep big foundation pit in soft clay area as claimed in claim 6 synchronizes excavation implementation, it is characterized in that, according to classical earth pressure theory, Vertical elastic foundation beam method often walks excavation to foundation ditch, support sets up and tears open under support step Internal force of support structure, deformation and stability is used to carry out computational analysis；The tunneling boring simultaneously using method district deep to foundation ditch, the shallow intersection of numerical analysis carries out secondary analog, and binding isotherm calculates and adjusts supporting parameter, optimization design, to determine that staying of soil body platform during foundation pit construction sets the situation of change of the deformation effect to supporting construction and surrounding, and then every monitoring standard is proposed.
8. the asymmetric deep big foundation pit in soft clay area as claimed in claim 6 synchronizes excavation implementation, it is characterized in that, the slope toplap of excavation stage soil body platform carries limit value 20kPa, it is desirable to reduces underground water position and discharges surface water, forbids that the aqueous reflux that surface water or foundation ditch are discharged bleeds back into foundation ditch.
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| CN105569050A (en) * | 2015-12-29 | 2016-05-11 | 华东交通大学 | Design method of angle brace supporting structure for foundation pit with lateral pressures of adjacent boundaries being imbalanced |
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