CN104563128A - Synchronous excavation supporting system for deep and large asymmetric pit in soft soil area and implementation method of supporting system - Google Patents
Synchronous excavation supporting system for deep and large asymmetric pit in soft soil area and implementation method of supporting system Download PDFInfo
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- CN104563128A CN104563128A CN201410822622.2A CN201410822622A CN104563128A CN 104563128 A CN104563128 A CN 104563128A CN 201410822622 A CN201410822622 A CN 201410822622A CN 104563128 A CN104563128 A CN 104563128A
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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
The invention discloses a synchronous excavation supporting system for a deep and large asymmetric pit in a soft soil area and an implementation method of the supporting system. The deep and large asymmetric pit consists of a deep area and a shallow area which are internally close to each other, the top elevation of an enclosure structure at the junction of the deep area and the shallow area is a substrate of the shallow area, the total pit is provided with a first horizontal support in a unified way, the deep area is additionally provided with a plurality of deep-area horizontal supports, a soil body platform used for balancing the horizontal transfer force of the deep-area horizontal supports is reserved at the junction of the interior of the shallow area and the deep area, and two sides of the soil body platform are sloped to the substrate of the shallow area, so that open excavation and bottom-up construction in the deep area and the shallow area can be synchronously carried out, the problem of imbalance of the internal force and the deformation of the pit caused by an asymmetric excavation mode due to function requirements is solved, and the asymmetric pit can be excavated in a safe, reliable, economic and environment-friendly mode; through the synchronous excavation of the deep area and the shallow area, the construction period can be effectively shortened, and the construction cost is reduced; moreover, the supporting system is definitely stressed, the horizontal force of each horizontal support additionally arranged in the deep area is reliably transferred, and the construction feasibility is high.
Description
Technical field
The present invention relates to geotechnical engineering design and construction field, especially for the New Supporting system of the Large Unsymmetric deep-foundation pit engineering in deep & thick silt matter soft soil layer under synchronous excavation construction period and implementation method.
Background technology
In recent years, in the process to soft clay area urban underground space comprehensive development project, owing to utilizing the difference of the degree of depth, there is the asymmetric deep big foundation pit that a lot of inner excavation degree of depth is inconsistent.Before, for space enclosing structure deformation character in excavation of foundation pit Precipitation Process and cause the research of environmental effect mostly to launch based on the symmetrical foundation ditch that cutting depth is consistent, however the stressing conditions of asymmetric foundation pit supporting system different parts and the common foundation ditch of deformation effect geometric ratio all more complex.
The asymmetric deep big foundation pit in soft clay area is often located in business district, and surrounding enviroment are complicated, is even close to river course or subway; Stratum is that saturated aqueous stream is moulded or soft plastic clay layer substantially, and when compressibilty is large, shear strength is low for hole, highly sensitive; And foundation ditch out-of-shape, single central island-type or benzvalene form soil excavation scheme is more difficult is suitable for, although adopt when the duration is urgent, inverse to do earthwork tunneling safe and reliable, high cost.
At present, the excavation of asymmetric deep big foundation pit, mainly adopt first dark rear shallow subregion independent construction method, do not realize the synchronous excavation construction in dark, shallow district, construction period is long, and construction cost is also higher.
Therefore, be necessary mentality of designing and the construction method of such deep big foundation pit of exploratory development, to reaching safety, reasonable, economic, efficient object.
Summary of the invention
The object of the present invention is to provide the synchronous excavation supporting system of the asymmetric deep big foundation pit in a kind of soft clay area and implementation method; first horizontal support is arranged by full foundation ditch is unified; dark district sets up the support pattern of some Dao Shen district horizontal supports and intersection remaining soils platform; solve and need to cause the asymmetric foundation ditch internal force that causes of digging mode due to function and be out of shape unbalanced problem; guarantee safe, reliable, the economy of excavation of foundation pit, environmental protection; the schedule requirement that realization is dark, Qian Liang district synchronously excavates; effective reduction of erection time, reduce construction cost.
For solving the problems of the technologies described above, the invention provides following technical scheme:
The synchronous excavation supporting system of a kind of asymmetric deep big foundation pit in soft clay area, the dark district that described asymmetric deep big foundation pit is close to by inside and shallow district form, deeply, the top mark height of Qian Liang district intersection space enclosing structure is the substrate in described shallow district, full foundation ditch is unified arranges first horizontal support, dark district sets up some Dao Shen districts horizontal support, one is reserved for balancing the soil body platform of the horizontal power transmission of some Dao Shen district horizontal supports of setting up in described dark district at shallow district Nei Yushen district intersection, the substrate of Po Zhiqian district is sidelong by described soil body platform two, thus realize dark, the open cut of Qian Liang district is along building synchronous construction.
Preferably, described dark, Qian Liang district cutting depth is respectively 8-20m and 3-7m.
Preferably, the width of described soil body platform should not be 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, layering is in easy flights in 1:2.0, domatic and platform surface all adopt be more than or equal to 50 thick in establish the C20 concrete pavement bank protection of φ 6200 two-way concrete slab net, and the vertical domatic φ 12 joint bar adjacent spacing of long 1m being set and being not more than 1m, 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, the described some Dao Shen districts horizontal support set up in described first horizontal support and dark district all adopts steel concrete horizontal support, and described some Dao Shen districts horizontal support that described first horizontal support is set up in dark district all adopts supportting, angle brace is in conjunction with the arrangement form of fringe truss.
Preferably, foundation ditch adopts campshed fender body or diaphragm wall as periphery and intersection space enclosing structure.
The invention also discloses the asymmetric deep big foundation pit in a kind of soft clay area and synchronously excavate implementation method, adopt the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as above, comprise the steps:
Operating mode one, levelling of the land, carries out space enclosing structure, stand column pile and Construction of Engineering Pile;
Operating mode two, full foundation ditch top layer excavation, first horizontal support is built in unification;
Operating mode three, dark district and shallow district start to carry out soil excavation simultaneously, and shallow district Nei Yushen district intersection reserves one for balancing the soil body platform of the horizontal power transmission of some Dao Shen district horizontal supports of subsequent construction in dark district, and the substrate of Po Zhiqian district is sidelong by described soil body platform two;
Operating mode four, some Dao Shen districts horizontal support described in stage excavation in dark district pouring construction; Meanwhile, the area dividing in shallow district except soil body platform excavates and builds sole plate and support replacement;
Operating mode five, is excavated to substrate in dark district and pouring construction sole plate and support replacement, continues excavation construction except soil body platform is with the underground structure of exterior domain in shallow district;
Operating mode six, dark district has progressively constructed underground structure after removing described some Dao Shen districts horizontal support, and in shallow district, soil body platform region piecemeal carries out soil excavation and builds sole plate in time;
Operating mode seven, dark district continues construction underground structure, and dark, Qian Liang district intersection underground structure is communicated with, and shallow district excavation remaining area is to substrate and 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, adopt Vertical elastic foundation beam method often to walk excavation to foundation ditch, support erection and tear the Internal force of support structure supportted under operating mode, distortion and stability open and carry out computational analysis; Adopt the tunneling boring of the method for numerical analysis dark to foundation ditch, shallow district intersection to carry out secondary analog simultaneously, and binding isotherm calculates adjustment supporting parameter, optimal design, to determine the situation of change staying deformation effect and the surrounding environment of establishing supporting and protection structure of soil body platform in foundation pit construction process, and then every monitoring standard is proposed.
Preferably, limit value 20kPa is carried in the slope toplap of excavation stage soil body platform, requires reduce underground water position and get 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 above disclosed technical scheme, compared with prior art, beneficial effect of the present invention is as follows:
The invention solves the technical problem that the asymmetric deep big foundation pit engineering in background technology exists in design, construction etc., it is according to the geo-logical terrain feature of In Soft Muddy Soil Region, under the prerequisite meeting synchronous excavation construction period, select the supporting design scheme of science safety, economical rationality targetedly, first horizontal support is arranged by full foundation ditch is unified, dark district sets up the support pattern of some Dao Shen district horizontal supports and intersection remaining soils platform, and adopt the construction method adapted with it, specifically there is following beneficial effect:
(1) first horizontal support is arranged by full foundation ditch is unified; dark district sets up the support pattern of some Dao Shen district horizontal supports and intersection remaining soils platform; solve and need to cause the asymmetric foundation ditch internal force that causes of digging mode due to function and be out of shape unbalanced problem; foundation pit deformation is effectively controlled; surrounding enviroment protected effect is good, all less on the impact of peripheral path, pipeline and building generation in Excavation Process.
(2) first horizontal support is arranged by full foundation ditch is unified, dark district sets up the support pattern of some Dao Shen district horizontal supports and intersection remaining soils platform, dark, Qian Liang district can be realized synchronously excavate, effectively shorten the duration of a project, substantially increase efficiency of construction, also reduce technical measures expense, achieve the maximization of economic benefit.
(3) pass through at Nei Yushen district of shallow district intersection remaining soils platform, can ensure that the horizontal force of the some Dao Shen districts horizontal support set up in dark district obtains reliable delivery, support system is clearly stressed, construction feasibility, operability are good, stronger to the compliance of the similar base pit engineering of soft stratum.
(4) due to can synchronous construction, the agent structure of dark, Qian Liang district intersection can one-shot forming, avoids staying of constuction joint and establishes, the good integrity of permanent structure.
(5) foundation ditch adopts campshed fender body or diaphragm wall as periphery and intersection space enclosing structure, 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 the generalized section of dark, the Qian Liang district intersection of the synchronous excavation supporting system of asymmetric deep big foundation pit in one embodiment of the invention;
Fig. 3 to Figure 10 is that in one embodiment of the invention, asymmetric deep big foundation pit synchronously excavates implementation method 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 dark district of 1-, the shallow district of 2-, 3-intersection space enclosing structure, 4-first horizontal support, 5-dark district horizontal support, 6-soil body platform, 7-periphery space enclosing structure, 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
Below in conjunction with the drawings and specific embodiments, the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area that the present invention proposes is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Core concept of the present invention: after the unified formation full hole first horizontal struts system of cutting the earth in top layer, dark, Qian Liang district carries out soil excavation simultaneously; By reserving the soil body platform of enough width at shallow district Nei Yushen district intersection to balance the horizontal power transmission of the some Dao Shen districts horizontal support set up in dark district, all the other scopes successively piecemeal carry out excavation construction; After dark district underground structure has progressively been constructed and removed the some Dao Shen districts horizontal support set up in dark district, then excavate the soil body platform of intersection and build residue sole plate; Remove first horizontal support subsequently, complete whole Underground Construction; Solve and need to cause the asymmetric foundation ditch internal force that causes of digging mode due to function and be out of shape unbalanced problem, guarantee safe, reliable, the economy of asymmetric excavation of foundation pit, environmental protection, realize schedule requirement that is dark, Qian Liang district synchronous construction, effective reduction of erection time, reduce construction cost.
Refer to Fig. 1 to Figure 11, present embodiment discloses the synchronous excavation supporting system of the asymmetric deep big foundation pit in a kind of soft clay area, described foundation ditch flat shape is irregular, overall in " ㄣ " shape, dark district 1 and shallow district 2 that described foundation ditch is close to by inside form, deeply, Qian Liang district cutting depth can be respectively 8-20m and 3-7m, and in the present embodiment, described dark district 1 is respectively 10m and 5m with the cutting depth in described shallow district 2.The substrate that described top mark height that is dark, Qian Liang district intersection space enclosing structure (namely for separating the intersection space enclosing structure 3 in dark district 1 and shallow district 2) is described shallow district 2, full foundation ditch is unified arranges first horizontal support 4, dark district 1 sets up some Dao Shen districts horizontal support 5, one is reserved for balancing the soil body platform 6 of the horizontal power transmission of some Dao Shen districts horizontal support 5 of setting up in dark district 1 at shallow district 2 Nei Yushen district 1 intersection, the substrate in Po Zhiqian district 2 is sidelong by two of described soil body platform 6, thus realizes dark, Qian Liang district 1,2 open cut along building synchronous construction.Described some refer to together or together more than, in the present embodiment, dark district horizontal support together of constructing in dark district 1, twice of certainly can constructing as required are multiple tracks dark district horizontal support even more.One aspect of the present invention, first horizontal support 4 is arranged by full foundation ditch is unified, dark district 1 sets up some Dao Shen districts horizontal support 5 and shallow district 2 support pattern at intersection remaining soils platform 6, solve and need to cause the asymmetric foundation ditch internal force that causes of digging mode due to function and be out of shape unbalanced problem, foundation pit deformation is effectively controlled, surrounding enviroment protected effect is good, all less on the impact of peripheral path, pipeline and building generation in Excavation Process; On the other hand, first horizontal support 4 is arranged by full foundation ditch is unified, dark district 1 sets up some Dao Shen districts horizontal support 5 and shallow district 2 support pattern at intersection remaining soils platform 6, dark, Qian Liang district 1,2 can be realized synchronously excavate, effectively shorten the duration of a project, substantially increase efficiency of construction, also reduce technical measures expense, achieve the maximization of economic benefit; Again on the one hand, due to can synchronous construction, the agent structure of dark, Qian Liang district 1,2 intersection can one-shot forming, avoids staying of constuction joint and establishes, 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, the horizontal force reliable delivery of the described some Dao Shen districts horizontal support 5 set up in dark district 1 can be ensured, support system is clearly stressed, construction feasibility, operability are all better, stronger to the compliance of the similar base pit engineering of soft stratum.
Preferably, the width of described soil body platform 6 is not less than 20000mm, enough support forces are played with the described some Dao Shen districts horizontal support 5 set up dark district 1, the distortion size of foundation ditch in effective control Excavation Process, alleviates the adverse effect that excavation of foundation pit produces peripheral path, pipeline and building.
Preferably, the slope lift height of putting of described soil body platform 6 is not more than 4m, layering is in easy flights in 1:2.0, domatic and platform surface all adopt be more than or equal to 50 thick in establish the C20 concrete pavement bank protection of φ 6200 two-way concrete slab net, and the vertical domatic φ 12 joint bar adjacent spacing of long 1m being set and being not more than 1m, unreceipted unit is mm.Setting like this; can available protecting soil body platform 6, prevent soil body platform 6 unstability, guarantee that the described some Dao Shen districts horizontal support 5 to dark district 1 sets up reliably supports; thus effectively control foundation pit deformation, reduce in Excavation Process the negative effect that peripheral path, pipeline and building produce.
Preferably, the top, slope of described soil body platform 6 is arranged by arranging light-duty precipitation well point 8, effectively can improve the intensity of described soil body platform 6, to balance in dark district the horizontal power transmission of setting up horizontal support 5 better by the light-duty precipitation well point 8 for improving soil strength.
Preferably, the described some Dao Shen districts horizontal support 5 set up in described first horizontal support 4 and dark district all adopts steel concrete horizontal support, described some Dao Shen districts horizontal support 5 that described first horizontal support 4 is set up in dark district all adopts supportting, angle brace is in conjunction with the arrangement form of fringe truss, not only easy construction, and there is good support effects.
Preferably, described foundation ditch adopts campshed fender body or diaphragm wall as periphery and intersection space enclosing structure 7,3, that is for foundation ditch surrounding periphery space enclosing structure 7 and separate the form that dark district 1 and the intersection space enclosing structure 3 in shallow district 2 can adopt campshed fender body or diaphragm wall.In the present embodiment, described foundation ditch adopts campshed fender body as periphery and intersection space enclosing structure 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 synchronously excavates implementation method, and adopt the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as above, this implementation method comprises the steps:
Operating mode one, please consult Fig. 3 and Fig. 2 by emphasis, levelling of the land, carry out space enclosing structure, stand column pile 13 and engineering pile 12 and construct, described space enclosing structure comprises for separating dark district 1 and the intersection space enclosing structure 3 in shallow district 2 and the periphery space enclosing structure 7 of foundation ditch surrounding, operating mode one is this area routine techniques means, therefore do not repeat, do not illustrate stand column pile 13 and engineering pile 12 in Fig. 3, following figure is similar;
Operating mode two, please consult Fig. 4 by emphasis, full foundation ditch top layer excavation, and first horizontal support 4 is built in unification;
Operating mode three, please consult Fig. 5 by emphasis, dark district 1 starts to carry out soil excavation with shallow district 2 simultaneously, and shallow district 2 Nei Yushen district 1 intersection reserves one for balancing the soil body platform 6 of the horizontal power transmission of some Dao Shen districts horizontal support 5 of subsequent construction in dark district 1, and Po Zhiqian district 2 substrate is sidelong by 6 liang, described soil body platform;
Operating mode four, please consult Fig. 6 by emphasis, some Dao Shen districts horizontal support 5 described in stage excavation in dark district 1 pouring construction, and meanwhile, the area dividing in shallow district 2 except soil body platform 6 excavates and builds sole plate 9 and support replacement 11;
Operating mode five, please consult Fig. 7 by emphasis, be excavated to substrate and pouring construction sole plate 9 and support replacement 11 in dark 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 consult Fig. 8 by emphasis, and dark district 1 progressively construct underground structure 10 after removing described some Dao Shen districts horizontal support 5, and in shallow district 2, soil body platform 6 region piecemeal carries out soil excavation and also builds sole plate 9 in time;
Operating mode seven, please consult Fig. 9 by emphasis, and dark district 1 continues construction underground structure 10, and dark, Qian Liang district 1,2 intersection underground structure 10 is communicated with, and remaining area excavates to substrate and pouring construction sole plate 9 and support replacement 11 in shallow district 2;
Operating mode eight, please consult Figure 10 by emphasis, remove first horizontal support 4 in foundation ditch, whole underground structure 10 of having constructed.
Preferably, limit value 20kPa is carried in the slope toplap of excavation stage soil body platform 6, requires reduce underground water position and get 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, adopt Vertical elastic foundation beam method often to walk excavation to foundation ditch, support erection and tear the Internal force of support structure supportted under operating mode, distortion and stability open and carry out computational analysis; Adopt the tunneling boring of the method for numerical analysis dark to foundation ditch, shallow district 1,2 intersection to carry out secondary analog simultaneously, and binding isotherm calculates adjustment supporting parameter, optimal design, to determine the situation of change staying deformation effect and the surrounding environment of establishing supporting and protection structure of soil body platform in foundation pit construction process, 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 below:
1. 1. layer miscellaneous fill, can be divided into
11. layer bankets and
2layer creek bankets, 1.
1layer bankets and generally distributes, and the loose inequality of soil property, containing plant roots and stems, rubble, fragment of brick, concrete block etc., based on cohesive soil; 1.
2layer 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 is containing a large amount of creek bottom silt, and soil property is loose, uneven.
2. layer brown Huang ~ lark silty clay, plasticly-soft moulds, middle compressibilty, containing iron oxide spot and iron manganese concretion, increases soil property gradually soft with the degree of depth.Slightly smooth, dry strength is medium, and toughness is medium.
3.
1layer grey very soft sill clay, stream is moulded, high-compressibility, containing mica, folder thin layer silty soil.Slightly smooth, dry strength is medium, and toughness is medium.
3.
2layer grey loam, slightly close, middle compressibilty, containing mica, folder thin layer cohesive soil.Shake is swift in response, and dry strength is low, and toughness is low.
3.
3layer grey very soft sill clay, stream is moulded, high-compressibility, containing mica, folder thin layer silty soil.Slightly smooth, dry strength is medium, and toughness is medium.
4. layer grey silt clay, stream is moulded, high-compressibility, containing mica, shell, folder thin layer and lumps silty soil.Tangent plane is smooth, and dry strength is high, and toughness is high.
5.
1-1layer gray clay, softly to mould, high-compressibility, containing mica, and mud calcareous concretion, organic matter, folder thin layer silty soil.Tangent plane is smooth, and dry strength is high, and toughness is high.
5.
1-2layer grey silty clay, softly moulds, high-compressibility, containing mica, and mud calcareous concretion, organic matter, folder 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, under the prerequisite 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, dark district sets up the support pattern of some Dao Shen district horizontal supports and intersection remaining soils platform, and adopt the construction method adapted with it, solve and need to cause the asymmetric foundation ditch internal force that causes of digging mode due to function and be out of shape 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 all less, on the other hand, first horizontal support is arranged by full foundation ditch is unified, dark district sets up the support pattern of some Dao Shen district horizontal supports and intersection remaining soils platform, dark, Qian Liang district can be realized synchronously excavate, effectively shorten the duration of a project, substantially increase efficiency of construction, also reduce technical measures expense, achieve the maximization of economic benefit, again on the one hand, due to can synchronous construction, the agent structure of dark, shallow district intersection can one-shot forming, avoids staying of constuction joint and establishes, the good integrity of permanent structure, another aspect, by arranging soil body platform at the intersection in Nei Yushen district of shallow district, the horizontal force reliable delivery of the described some Dao Shen districts horizontal support set up in dark district can be ensured, support system is clearly stressed, construction feasibility, operability are all better, stronger to the compliance of the similar base pit engineering of soft stratum.In addition, Construction Technology of Retaining Structure is ripe, and steady quality, antiseep is respond well, and safety stock is reasonable.In a word, the present invention can guarantee that the synchronous excavation of the asymmetric deep big foundation pit in soft clay area realizes safety, reliable, economy, environmental protection.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection domain of claims.
Claims (10)
1. the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area, it is characterized in that, the dark district that described asymmetric deep big foundation pit is close to by inside and shallow district form, deeply, the top mark height of Qian Liang district intersection space enclosing structure is the substrate in described shallow district, full foundation ditch is unified arranges first horizontal support, dark district sets up some Dao Shen districts horizontal support, one is reserved for balancing the soil body platform of the horizontal power transmission of some Dao Shen district horizontal supports of setting up in described dark district at shallow district Nei Yushen district intersection, the substrate of Po Zhiqian district is sidelong by described soil body platform two, thus realize dark, the open cut of Qian Liang district is along building synchronous construction.
2. the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as claimed in claim 1, is characterized in that, described dark, Qian Liang district cutting depth is respectively 8-20m and 3-7m.
3. the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as claimed in claim 1, it is characterized in that, the width of described soil body platform should not be less than four times of shallow district cutting depth.
4. the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as claimed in claim 1, it is characterized in that, the slope lift height of putting of described soil body platform is not more than 4m, and layering is in easy flights in 1:2.0; Domatic and platform surface all adopt be more than or equal to 50 thick in establish the C20 concrete pavement bank protection of φ 6200 two-way concrete slab net, and the vertical domatic φ 12 joint bar adjacent spacing of long 1m being set and being not more than 1m, unreceipted unit is mm.
5. the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as claimed in claim 1, is characterized in that, the light-duty precipitation well point for improving soil strength is arranged on the top, slope of described soil body platform.
6. the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as claimed in claim 1, it is characterized in that, the described some Dao Shen districts horizontal support set up in described first horizontal support and dark district all adopts steel concrete horizontal support, and described some Dao Shen districts horizontal support that described first horizontal support is set up in dark district all adopts supportting, angle brace is in conjunction with the arrangement form of fringe truss.
7. the synchronous excavation supporting system of the asymmetric deep big foundation pit in soft clay area as claimed in claim 1, is characterized in that, described foundation ditch adopts campshed fender body or diaphragm wall as periphery and intersection space enclosing structure.
8. the asymmetric deep big foundation pit in soft clay area synchronously excavates an implementation method, it is characterized in that, adopts the synchronous excavation supporting system of deep big foundation pit as asymmetric in the soft clay area in claim 1-7 as described in any one, comprises the steps:
Operating mode one, levelling of the land, carries out space enclosing structure, stand column pile and Construction of Engineering Pile;
Operating mode two, full foundation ditch top layer excavation, first horizontal support is built in unification;
Operating mode three, dark district and shallow district start to carry out soil excavation simultaneously, and shallow district Nei Yushen district intersection reserves one for balancing the soil body platform of the horizontal power transmission of some Dao Shen district horizontal supports of subsequent construction in dark district, and the substrate of Po Zhiqian district is sidelong by described soil body platform two;
Operating mode four, some Dao Shen districts horizontal support described in stage excavation in dark district pouring construction; Meanwhile, the area dividing in shallow district except soil body platform excavates and builds sole plate and support replacement;
Operating mode five, is excavated to substrate in dark district and pouring construction sole plate and support replacement, continues excavation construction except soil body platform is with the underground structure of exterior domain in shallow district;
Operating mode six, dark district has progressively constructed underground structure after removing described some Dao Shen districts horizontal support, and in shallow district, soil body platform region piecemeal carries out soil excavation and builds sole plate in time;
Operating mode seven, dark district continues construction underground structure, and dark, Qian Liang district intersection underground structure is communicated with, and shallow district excavation remaining area is to substrate and pouring construction sole plate and support replacement;
Operating mode eight, removes first horizontal support in foundation ditch, whole underground structure of having constructed.
9. the asymmetric deep big foundation pit in soft clay area as claimed in claim 8 synchronously excavates implementation method, it is characterized in that, according to classical earth pressure theory, adopt Vertical elastic foundation beam method often to walk excavation to foundation ditch, support erection and tear the Internal force of support structure supportted under operating mode, distortion and stability open and carry out computational analysis; Adopt the tunneling boring of the method for numerical analysis dark to foundation ditch, shallow district intersection to carry out secondary analog simultaneously, and binding isotherm calculates adjustment supporting parameter, optimal design, to determine the situation of change staying deformation effect and the surrounding environment of establishing supporting and protection structure of soil body platform in foundation pit construction process, and then every monitoring standard is proposed.
10. the asymmetric deep big foundation pit in soft clay area as claimed in claim 8 synchronously excavates implementation method, it is characterized in that, limit value 20kPa is carried in the slope toplap of excavation stage soil body platform, requires reduce underground water position and get rid of surface water, forbids that the aqueous reflux that surface water or foundation ditch are got rid of bleeds back into foundation ditch.
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN105649089A (en) * | 2016-01-13 | 2016-06-08 | 江西博慧工程技术服务有限公司 | Construction method for excavating foundation pit close to existing shallow foundation protection structure |
| CN106545019A (en) * | 2016-10-12 | 2017-03-29 | 上海建工建集团有限公司 | For the support-replacing system and construction method of stage differential style Underground Construction |
| CN107313431A (en) * | 2017-08-02 | 2017-11-03 | 中铁隧道集团二处有限公司 | Close on not contour foundation ditch method for synchronously constructing |
| CN108978676A (en) * | 2018-09-04 | 2018-12-11 | 北京市机械施工有限公司 | A kind of construction method of foundation pit group and basic pile group |
| CN109487798A (en) * | 2018-12-29 | 2019-03-19 | 中交（广州）建设有限公司 | Station asymmetry excavation supporting structure and construction technology |
| CN111501777A (en) * | 2020-04-20 | 2020-08-07 | 中铁隧道集团二处有限公司 | Construction method for treating bias voltage of open cut foundation pit |
| CN112411555A (en) * | 2020-11-16 | 2021-02-26 | 上海宝冶集团有限公司 | Method for synchronous construction of deep foundation pit and edge foundation process |
| CN112609706A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of opposite-bracing angle brace concrete horizontal supporting structure of foundation pit in sea reclamation area |
| CN112813983A (en) * | 2020-12-31 | 2021-05-18 | 长江勘测规划设计研究有限责任公司 | Cantilever beam-column system implemented synchronously with pit depth in pit and construction method |
| CN112832248A (en) * | 2021-01-06 | 2021-05-25 | 中铁五局集团第一工程有限责任公司 | Urban tunnel subway station construction method and deep and large foundation pit group construction dynamic monitoring and measuring method |
| CN112854229A (en) * | 2021-01-08 | 2021-05-28 | 中国建筑第八工程局有限公司 | Earth excavation method for foundation pit groups at different depths on two sides of operation subway |
| CN113530236A (en) * | 2021-07-20 | 2021-10-22 | 中国水利水电第十二工程局有限公司 | Construction method for mudflat photovoltaic power station |
| CN117248539A (en) * | 2023-11-17 | 2023-12-19 | 上海建工一建集团有限公司 | Co-construction reverse excavation supporting structure for subway cross soft soil oversized foundation pit and construction method |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105649089A (en) * | 2016-01-13 | 2016-06-08 | 江西博慧工程技术服务有限公司 | Construction method for excavating foundation pit close to existing shallow foundation protection structure |
| CN105649089B (en) * | 2016-01-13 | 2017-11-07 | 南昌市建筑工程集团有限公司 | A kind of excavation of foundation pit closes on existing shallow foundation protection structure construction method |
| CN106545019B (en) * | 2016-10-12 | 2019-02-12 | 上海建工一建集团有限公司 | Support-replacing system and construction method for stage differential style Underground Construction |
| CN106545019A (en) * | 2016-10-12 | 2017-03-29 | 上海建工建集团有限公司 | For the support-replacing system and construction method of stage differential style Underground Construction |
| CN107313431A (en) * | 2017-08-02 | 2017-11-03 | 中铁隧道集团二处有限公司 | Close on not contour foundation ditch method for synchronously constructing |
| CN108978676A (en) * | 2018-09-04 | 2018-12-11 | 北京市机械施工有限公司 | A kind of construction method of foundation pit group and basic pile group |
| CN108978676B (en) * | 2018-09-04 | 2020-08-14 | 北京市机械施工有限公司 | Construction method of foundation pit group and foundation pile group |
| CN109487798A (en) * | 2018-12-29 | 2019-03-19 | 中交（广州）建设有限公司 | Station asymmetry excavation supporting structure and construction technology |
| CN109487798B (en) * | 2018-12-29 | 2024-03-22 | 中交（广州）建设有限公司 | Asymmetric excavation construction process for station |
| CN111501777A (en) * | 2020-04-20 | 2020-08-07 | 中铁隧道集团二处有限公司 | Construction method for treating bias voltage of open cut foundation pit |
| CN111501777B (en) * | 2020-04-20 | 2021-07-16 | 中铁隧道集团二处有限公司 | Construction method for treating bias voltage of open cut foundation pit |
| CN112411555A (en) * | 2020-11-16 | 2021-02-26 | 上海宝冶集团有限公司 | Method for synchronous construction of deep foundation pit and edge foundation process |
| CN112609706B (en) * | 2020-12-09 | 2022-05-17 | 中铁二十局集团第六工程有限公司 | Construction method of opposite-bracing angle brace concrete horizontal supporting structure of foundation pit in sea reclamation area |
| CN112609706A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of opposite-bracing angle brace concrete horizontal supporting structure of foundation pit in sea reclamation area |
| CN112813983A (en) * | 2020-12-31 | 2021-05-18 | 长江勘测规划设计研究有限责任公司 | Cantilever beam-column system implemented synchronously with pit depth in pit and construction method |
| CN112813983B (en) * | 2020-12-31 | 2022-07-22 | 长江勘测规划设计研究有限责任公司 | Cantilever beam-column system implemented synchronously with pit depth in pit and construction method |
| CN112832248A (en) * | 2021-01-06 | 2021-05-25 | 中铁五局集团第一工程有限责任公司 | Urban tunnel subway station construction method and deep and large foundation pit group construction dynamic monitoring and measuring method |
| CN112832248B (en) * | 2021-01-06 | 2022-04-19 | 中铁五局集团第一工程有限责任公司 | Urban tunnel subway station construction method and deep and large foundation pit group construction dynamic monitoring and measuring method |
| CN112854229A (en) * | 2021-01-08 | 2021-05-28 | 中国建筑第八工程局有限公司 | Earth excavation method for foundation pit groups at different depths on two sides of operation subway |
| CN113530236A (en) * | 2021-07-20 | 2021-10-22 | 中国水利水电第十二工程局有限公司 | Construction method for mudflat photovoltaic power station |
| CN113530236B (en) * | 2021-07-20 | 2022-07-22 | 中国水利水电第十二工程局有限公司 | Construction method for mudflat photovoltaic power station |
| CN117248539A (en) * | 2023-11-17 | 2023-12-19 | 上海建工一建集团有限公司 | Co-construction reverse excavation supporting structure for subway cross soft soil oversized foundation pit and construction method |
| CN117248539B (en) * | 2023-11-17 | 2024-02-06 | 上海建工一建集团有限公司 | Co-construction reverse excavation supporting structure for subway cross soft soil oversized foundation pit and construction method |
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