CN102108707A - Huge ultradeep foundation pit accurate subsidence and environmentally-friendly construction method - Google Patents
Huge ultradeep foundation pit accurate subsidence and environmentally-friendly construction method Download PDFInfo
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- CN102108707A CN102108707A CN 201110060977 CN201110060977A CN102108707A CN 102108707 A CN102108707 A CN 102108707A CN 201110060977 CN201110060977 CN 201110060977 CN 201110060977 A CN201110060977 A CN 201110060977A CN 102108707 A CN102108707 A CN 102108707A
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Abstract
The invention discloses a huge ultradeep foundation pit accurate subsidence and environmentally-friendly construction method, which belongs to the technical field of constructional engineering. In the design and construction process of a huge ultradeep foundation pit, the accurate prediction and control of the subsidence of the ground surrounding the foundation pit due to compression of a water-bearing stratum during the pumping of confined water in the pit are performed. In the invention, the operation is simple, a handling method is reasonably determined and selected when the subsidence is subsidence is predicted accurately, and thus, the subsidence of the surrounding ground is controlled, environment is protected and the method is an economic construction method.
Description
Technical field
What the present invention relates to is a kind of method of construction engineering technical field, specifically is accurate sedimentation of a kind of super large ultra-deep foundation pit and environmental protection job practices.
Background technology
Along with the Yangtze River Delta Area sustained economic growth, the paces of urban construction are also accelerated, and ground space can not satisfy the demand of present metropolis economic development far away, and increasing underground construction occurs in succession.Therefore base pit engineering also becomes the new focus of the flourishing urban construction of coastal economy.Increasing super large ultra-deep foundation pit appears in the city, and the degree of depth of all kinds of foundation ditch construction excavation has directly entered into corresponding artesian aquifer, and unheeded in the past groundwater environment problem becomes the engineering problem that can't ignore finally.Simultaneously, surface settlement also becomes the key of environmental protection problem in the foundation ditch design and construction around the foundation ditch that causes owing to the change of water environment.The compression in the aquifer that causes when particularly foundation ditch extracts artesian water.Ground settlement Forecasting Methodology behind the tradition foundation ditch barricade mainly contains the method for estimating in conjunction with cutting depth according to the ground settlement distributional pattern of Heish or Clough proposition, or the stratum of peck loss method.And main the employing strengthened the draw water method control peripheral ground sedimentation of scheme of the measure of going along with sb. to guard him and optimization in engineering.Even in the relatively poor environment of geological conditions, do not stint and adopt ground-connecting-wall to punch the relatively poor design scheme of this economy of artesian aquifer entirely to reach the purpose of the influence that controls environment.
In the at present increasing simultaneously super large ultra-deep foundation pit construction, needing when excavation of foundation pit, can't avoid the long-time artesian water that extracts aquifer sand layer.And at present be generally one-dimensional consolidation for aquifer sand layer compression forecast method or wait to the deformation pattern of compressing, the common ground of this method is a soil deformation of only having considered that vertical stress causes.Studies show that of (" Mechanics of land subsidence due to groundwater pumpimg ") (the stratum settlement Analysis on Mechanism that causes by drawing water) but on " International journal for numerical and analytical methods in geomechanics " (international geotechnical engineering numerical simulation with analyze periodical), delivered according to Budhu etc. 2009, head in aquifer sand layer is because external cause has produced bigger hydraulic gradient, promptly have under the bigger hydraulic gradient situation, must adopt shearing, reverse and produce the non-equilibrium mechanics system of cosserat that distortion takes into full account and determine the aquifer decrement.Point out in (" 3D finite element modeling of shear band localization via the micro-polar Cosserat continuum theory ") (based on the three-dimensional shear band Position Research of micropolar Cosserat continuous arranging opinion) that while Khoei etc. delivered on " Computational Materials Science " (calculating material science) in 2010, do not consider the size of micro unit in traditional Cauchy's mechanics, promptly when determining distortion, only consider to wait to fixed, carry out the stress deformation simulation in the zone of shear stress concentration and bigger error can occur, no longer suitable.And the non-equilibrium mechanics system of Cosserat, owing to considered the size of unit bodies, the stress on each cell cube can be considered the non-uniform Distribution state, thereby can simulate the ess-strain situation under the big shear stress condition preferably.And in super large ultra-deep foundation pit work progress, cause the traditional grade of being not only of stratum deformation, compressive stress, the generation of shearing is more arranged, reversing to fixed.So in the construction of super large ultra-deep foundation pit, only adopt traditional settlement prediction and control method, not only can't accurately judge foundation ditch ground settlement on every side, and the design economic benefit that blindly adopts super dark diaphragm wall to cut off the aquifer entirely can reduce greatly.Shen Shuilong in 2006 etc. are at " Underground construction and ground movement ", deliver on 377~384 pages of (move on underground construction and stratum) 2006 terms, (" Analysis of settlement due to withdraw of groundwater around an unexcavated foundation pit "), (research of settlement issues around the non-excavation basis that causes by drawing water) further proposes in the engineering because the ground settlement problem that causes of drawing water is very serious.These studies show that, press for a kind of method at accurate prediction of sedimentation around the super large ultra-deep foundation pit and economic control at present.
Existing technical literature retrieval is found " base pit engineering handbook (China Construction Industry Press's publication) has all been made detailed explanation to the prediction and the control worker method of sedimentation behind the foundation ditch wall, and proves reliable by the checking of actual engineering.But for the super large ultra-deep foundation pit, space enclosing structure is not blocked relevant artesian aquifer and when needing to extract artesian water, does not provide targetedly Forecasting Methodology and adopts this a series of worker's method of corresponding counter-measure according to the sedimentation situation.So must propose supporting more targetedly worker's method on this basis, to guarantee in this type of foundation pit construction process the protection of surrounding environment.
Summary of the invention
The present invention is directed to the prior art above shortcomings; accurate sedimentation of a kind of super large ultra-deep foundation pit and environmental protection job practices are provided; simple to operate; when accurately predicting sedimentation; rationally judge and select processing method; thereby reach the sedimentation of control peripheral ground, the purpose of protection environment is a kind of worker's method of economy.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
Described layout water level observation well comprises: pipe well pore-forming and pipe well Cheng Jing, wherein: adopt traditional rotary drilling mode to construct into well for the Quaternary system stratum, need guard against borehole well instability in the drilling process simultaneously, adopt the method for sleeve pipe retaining wall, well casing is installed behind pore-forming.
Described cosserat sedimentation coefficient a is determined by following mode:
1. artesian aquifer design precipitation head h in the known foundation ditch
w, this moisture h of initial water layer by layer
0And record water level h in the observation well
tAccording to water level equation h=-(α x
2+ h
0), bring the water level value h at diverse location x place into, simultaneous equations are tried to achieve α and x, determine the water level equation of this model foundation ditch;
2. try to achieve the subsidiary stress { Δ σ ' } of all directions respectively according to determined water level equation differentiate in 1.;
3. according to determined subsidiary stress { Δ σ ' } and non-equilibrium mechanics constitutive equation { the Δ ε of cosserat in 2.
c}={ D}
-1{ Δ σ ' } determines distortion { Δ ε
c, wherein { D} is the cosserat elastic matrix;
4. contrast { Δ ε } that the method under traditional Cauchy's theory of mechanics calculates, according to formula a={ Δ ε }/{ Δ ε
cDetermine a.
According to relevant specification of country and provincialism industry guide, at different foundation ditch Standard Selection settlement Control value δ
Vms, work as δ
Vms>δ
VmThe time, then the foundation ditch sedimentation reaches requirement; Work as δ
Vms<δ
VmThe time, then the foundation ditch sedimentation does not reach requirement, need be for further processing.
Described high pressure vacuum recharge well, comprise: cast iron well bore, well head, cast iron well cap, fixing rivet and flow pipe spout, wherein: 5 millimeters of cast iron well bore thicknesss of pipe wall, the long 2-2.5 rice of well head, cast iron well cap outer and the welding of cast iron well bore tube wall, in the middle of the cast iron well cap perforate and with the welding of flow pipe shower nozzle, fixing rivet be fixedly set in the cast iron well bore around calibrated altitude and be evenly distributed with 45.
The long 2-2.5 rice of described well head also uses the filter screen parcel,
Along being provided with the water proof rubber circle, prevent from when high pressure recharges, to leak in the described cast iron well cap.
Be provided with the watertight rubber circle between described flow pipe shower nozzle and the well cap.
Described layout high pressure vacuum recharge well comprises: pipe well pore-forming and pipe well Cheng Jing, wherein: adopt traditional rotary drilling mode to construct into well for the Quaternary system stratum, need guard against borehole well instability in the drilling process simultaneously, adopt the method for sleeve pipe retaining wall, well casing is installed behind pore-forming, buried depth is under minimum design water level or minimum permission groundwater table 3~5 meters at the bottom of the pipe of high pressure vacuum recharge well, between between layer artesian aquifer; Answer the backfill medium coarse sand between the cast iron well bore and the borehole wall, 5 meters use swell soil to replace the sand backfill on the distance face of land, when well casing is in place rivet and the ground reserved on the cast iron well bore are fixed, and guarantee that the high pressure vacuum recharge well can normally use.When recharging construction, the water supply pressure pump is selected 0.1-0.2MPa pressure.
Compare with original technology, the present invention has used the high pressure vacuum recharge well, in conjunction with the present nearest in the world non-equilibrium mechanics system of cosserat theory, when accurately the sedimentation of foundation ditch peripheral ground is judged in prediction, optionally adopt the mode of artificial recharge to control sedimentation.Making the super large ultra-deep foundation pit not only can reduce the influence to surrounding environment in work progress, more protected groundwater resources, is a kind of novel worker's method.
The present invention mainly is more accurate to the judgement prediction of sedimentation around the foundation ditch to traditional method advantage in actual applications, and method is simple.And selected the subsidence control method of artificial recharge targetedly for use for the foundation ditch form that such class is special, not only recycling water resource, and effectively controlled the ground settlement around the foundation ditch, so the present invention is no matter from social benefit, economic benefit, still on the technical benefits, have very big using value.Service orientation of the present invention is for need reducing relevant artesian aquifer head, and diaphragm wall enters into super large ultra-deep foundation pit under the situation that artesian aquifer can't punch simultaneously.
Compared with prior art, the present invention has following useful benefit: method of the present invention is simple, accurately predict under the prerequisite of sedimentation at the non-equilibrium mechanics model of cosserat, selectivity is used advanced worker's method of recharging technique, guaranteed the super large ultra-deep foundation pit in work progress, effective control of peripheral ground sedimentation.In the ground settlement of control around the foundation ditch, recycling water resource is so the present invention is no matter from social benefit, economic benefit, still on the technical benefits, have very big using value.Service orientation of the present invention is for need reducing relevant artesian aquifer head, and diaphragm wall enters into super large ultra-deep foundation pit under the situation that artesian aquifer can't punch simultaneously.
Description of drawings
Fig. 1 is high pressure vacuum recharge well detail structure figure.
Fig. 2 is an embodiment site operation schematic diagram.
Fig. 3 is worker's method of the present invention and traditional worker's method settlement Control contrast schematic diagram.
The specific embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the high pressure vacuum recharge well 1 that relates in the present embodiment, comprise: cast iron well bore 2, well head 3, cast iron well cap 4, fixing rivet 5 and flow pipe spout 6, wherein: 5 millimeters of the thicknesss of pipe wall of cast iron well bore 2, well head 3 long 2-2.5 rice, 2 welding of cast iron well cap 4 outers and cast iron well bore, in the middle of the cast iron well cap 4 perforates and with the welding of flow pipe shower nozzle, fixing rivet 5 be fixedly set in cast iron lining around calibrated altitude and be evenly distributed with fixing high pressure vacuum recharge well 1 with 45.
Described well head 3 long 2-2.5 rice also use filter screen 7 parcels;
Along being provided with water proof rubber circle 8, prevent from when high pressure recharges, to leak in the described cast iron well cap 4.
Be provided with watertight rubber circle 8 between described flow pipe shower nozzle and the well cap 4.
As shown in Figure 2, be example with somewhere super large ultra-deep foundation pit, concrete application is carried out according to the following steps:
δ
vm=abH
Wherein a that proposes according to this worker method determines that method obtains that a is 1.3 in this engineering, and b chooses 0.43 according to this area foundation pit construction statistical law over the years, obtains δ
Vm=0.559%H, according to this area's subway foundation pit engineering construction code requirement, three class foundation ditches allow peripheral ground sedimentation value δ
VmsBe 0.5%H, δ
Vm>δ
Vms, need carry out settlement Control and handle.
The effect of present embodiment: in the super large ultra-deep foundation pit work progress, do not use treatment measures and use the settling ratio that causes on ground around the construction corps of present embodiment more as shown in Figure 3; Can effectively reduce the maximum settlement of foundation ditch peripheral ground at least 25% and 30% settlement influence scope after the method construction according to this enforcement.
Claims (6)
1. accurate sedimentation of super large ultra-deep foundation pit and environmental protection job practices is characterized in that, may further comprise the steps:
Step 1, on-the-spot hydrogeology exploration, the boring of fetching earth, divide soil layer, determine the top board of artesian aquifer in the effect of project scope and the projected depth of burying underground that the base plate degree of depth is also determined excavation of foundation pit and space enclosing structure, contrast the artesian aquifer top board and the base plate degree of depth that early stage, hydrogeology recorded, judge the water proof form, when the ground-connecting-wall degree of depth less than the artesian aquifer base plate degree of depth, and when needing in the work progress to extract this layer underground water for a long time, then continue next step;
Step 2, on-the-spot addressing is selected suitable position to build around foundation ditch according to the ready-made actual conditions of each site construction and is recharged the transfer pond, recharge the size in transfer pond and also select according to field condition, and moisture storage capacity is more than or equal to 2 hours pump-out of pumped well;
Step 3, periphery artesian water water level observation well along foundation ditch, distance apart from foundation ditch water-stop curtain 5-10m, each monitoring point spacing is 30~50 meters simultaneously, buried depth is under minimum design water level or minimum permission groundwater table 3~5 meters at the bottom of the pipe of water-level observation pipe, between between layer artesian aquifer;
Step 4 is determined behind the excavation of foundation pit sedimentation value: δ behind the issuable wall according to following formula
Vm=abH, wherein: a is for being changed the cosserat sedimentation coefficient that causes by hydraulic gradient; B is the sedimentation empirical coefficient, because various places soil property difference, according to working as foundation pit statistical law value, span is between 0.05%~1.0%; H designs cutting depth for foundation ditch;
Step 5, adopt original position to recharge facture, periphery high pressure vacuum recharge well along foundation ditch, distance apart from foundation ditch water-stop curtain 2m, each monitoring point spacing is 30~50 meters simultaneously, the high pressure vacuum recharge well is connected water pipe and water pump, and the water extraction that will recharge when foundation pit construction draws water beginning in the transfer pond is recharged to artesian aquifer.
2. accurate sedimentation of super large ultra-deep foundation pit according to claim 1 and environmental protection job practices, it is characterized in that, described layout water level observation well comprises: pipe well pore-forming and pipe well Cheng Jing, wherein: adopt traditional rotary drilling mode to construct into well for the Quaternary system stratum, need guard against borehole well instability in the drilling process simultaneously, adopt the method for sleeve pipe retaining wall, well casing is installed behind pore-forming.
3. accurate sedimentation of super large ultra-deep foundation pit according to claim 1 and environmental protection job practices is characterized in that, described cosserat sedimentation coefficient a is determined by following mode:
1. artesian aquifer design precipitation head h in the known foundation ditch
w, this moisture h of initial water layer by layer
0And record water level h in the observation well
t, according to water level equation h=-(α x
2+ h
0), bring the water level value h at diverse location x place into, simultaneous equations are tried to achieve α and x, determine the water level equation of this model foundation ditch;
2. try to achieve the subsidiary stress { Δ σ ' } of all directions respectively according to determined water level equation differentiate in 1.;
3. according to determined subsidiary stress { Δ σ ' } and non-equilibrium mechanics constitutive equation { the Δ ε of cosserat in 2.
c}={ D}
-1{ Δ σ ' } determines distortion { Δ ε
c, wherein { D} is the cosserat elastic matrix;
4. contrast { Δ ε } that the method under traditional Cauchy's theory of mechanics calculates, according to formula a={ Δ ε }/{ Δ ε
cDetermine a;
According to relevant specification of country and provincialism industry guide, at different foundation ditch Standard Selection settlement Control value δ
Vms, work as δ
Vms>δ
VmThe time, then the foundation ditch sedimentation reaches requirement; Work as δ
Vms<δ
VmThe time, then the foundation ditch sedimentation does not reach requirement, need be for further processing.
4. accurate sedimentation of super large ultra-deep foundation pit according to claim 1 and environmental protection job practices, it is characterized in that, described high pressure vacuum recharge well, comprise: cast iron tube wall, well head, cast iron well cap, fixing rivet and flow pipe spout, wherein: 5 millimeters of the wall thickness of cast iron tube wall, the long 2-2.5 rice of well head, cast iron well cap outer and the welding of cast iron tube wall, in the middle of the cast iron well cap perforate and with the welding of flow pipe shower nozzle, fixing rivet be fixedly set in cast iron lining around calibrated altitude and be evenly distributed with fixing high pressure vacuum recharge well with 45.
5. accurate sedimentation of super large ultra-deep foundation pit according to claim 1 and environmental protection job practices is characterized in that, the long 2-2.5 rice of described well head also uses the filter screen parcel; The edge is provided with the water proof rubber circle in the described cast iron well cap; Be provided with the watertight rubber circle between described flow pipe shower nozzle and the well cap.
6. accurate sedimentation of super large ultra-deep foundation pit according to claim 1 and environmental protection job practices, it is characterized in that, described layout high pressure vacuum recharge well comprises: pipe well pore-forming and pipe well Cheng Jing, wherein: adopt traditional rotary drilling mode to construct into well for the Quaternary system stratum, need guard against borehole well instability in the drilling process simultaneously, adopt the method for sleeve pipe retaining wall, well casing is installed behind pore-forming, buried depth is under minimum design water level or minimum permission groundwater table 3~5 meters at the bottom of the pipe of high pressure vacuum recharge well, between between layer artesian aquifer; Answer the backfill medium coarse sand between the cast iron well bore and the borehole wall, 5 meters use swell soil to replace the sand backfill on the distance face of land, when well casing is in place, rivet and the ground reserved on the cast iron well bore are fixed, guarantee that the high pressure vacuum recharge well can normally use, when recharging construction, the water supply pressure pump is selected 0.1-0.2MPa pressure.
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