CN104695492A - Method for handling dangers of cement-earth gravity-type enclosure wall in soft soil area - Google Patents
Method for handling dangers of cement-earth gravity-type enclosure wall in soft soil area Download PDFInfo
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Abstract
The invention discloses a method for handling dangers of a cement-earth gravity-type enclosure wall in a soft soil area, and belongs to the field of civil building engineering construction technologies. The method comprises the following steps: unloading an active area of a foundation pit to reduce water-earth pressure of the active area of the foundation pit; exerting a counter pressure to a passive area of the foundation pit to increase the resistance of the passive area; limiting a construction load; taking filling and repairing measures in a timely manner for cracks in a capping plate and a wall body of the cement-earth gravity-type enclosure wall; reinforcing the cement-earth gravity-type enclosure wall, controlling earthwork excavation, and quickly forming a rigid support-changing mechanism. Through a series of measures, foundation pit accidents, such as instability, slip and collapse, caused by deterioration of dangers such as deformation, cracking and leakage in an enclosure section of the cement-earth gravity-type enclosure wall during foundation pit excavation in a muddy soft soil layer can be prevented, so that safe and smooth implementation of foundation pit engineering are ensured.
Description
Technical field
The present invention relates to civil construction project technical field of construction, be specifically related to a kind of soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method.
Background technology
As the Shanghai in one of large soft foundation city, the world three, soft layer is deep, and groundwater table is buried shallow, and ambient conditions is responsive complicated; Foundation pit excavation and bracing by force comprehensive, uncertain large, system risk is high.According to District of Shanghai engineering experience for many years, the pattern of going along with sb. to guard him that the foundation ditch within the 5m degree of depth of excavation soft clay area the most often adopts is Cement-soil Gravity enclosure wall.Cement-soil Gravity enclosure wall forms the gravity body of wall with certain thickness and building-in depth after carrying out consolidation process by curing compound to foundation soil to keep off native water-stopping structure with the one of water, soil pressure after bearing wall, belongs to without supporting self-supporting retaining wall.This space enclosing structure is economic, practical, and because foundation ditch inside opens wide, the construction of soil excavation and underground structure is all more convenient.
But also there is some deficiency following in Cement-soil Gravity enclosure wall structure: one is mostly be soft layer in such excavation of foundation pit depth bounds of District of Shanghai, water content of soil is high, void ratio is large, modulus of compressibility is little, soil nature is poor, there are obvious thixotroping and rheological characteristic, under dynamic action, intensity reduction easily produces lateral displacement, the stability of impact local space enclosing structure; Two is that the discreteness of cement mixing method intensity is very large, standard deviation can reach 30% ~ 70%, the connection reinforcement component such as steel pipe, reinforcing bar at its top need anchor into coping, when it will depart from coping to hole is enterolithic simultaneously, and the cracking of aggravation Cement-soil Gravity enclosure wall further; Three subregion piecemeals not in strict accordance with designing requirement when being excavation and constructions are jumped and are dug, and layering in every block, the excavation section by section earthwork, but disposable excavation on a large scale is even significantly backbreak, also do not build sole plate and support replacement in time after being excavated to substrate, large area, open wide distortion and the ground settlement that the tau-effect that causes of constructing exacerbates space enclosing structure further for a long time; Four is that hole nonlocal top application work overload is excessive, has exceeded the ultimate load of designing requirement, thus has caused space enclosing structure to produce deformation.
Therefore, for when adopting Cement-soil Gravity enclosure wall as space enclosing structure in the foundation pit construction of muddy soft soil stratum, how to provide a kind of perfect dangerous situation processing method to avoid the generation of sudden accident, thus alleviate casualties, reduce economic loss be the technical problem that those skilled in the art need solution badly.
Summary of the invention
The object of the present invention is to provide a kind of soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method, go along with sb. to guard him region and cause the problem of foundation pit accident to solve Cement-soil Gravity enclosure wall in the foundation pit construction of existing muddy soft soil stratum because the dangerous situation such as distortion, cracking, seepage worsens.For solving the problems of the technologies described above, the dangerous situation processing method of Cement-soil Gravity enclosure wall provided by the invention, adopts the outer precipitation of Foundation Pit, unloads the Water And Earth Pressures that the measures such as soil reduce foundation ditch active region; At passive zone of pit surcharge reaction soil, reinforce hole subsoil body, to improve passive area drag; The emergency measures such as support, anchor structure are added to control the development of deformation of Cement-soil Gravity enclosure wall in wall body; And accelerate sole plate construction to form support replacement as early as possible, thus ensure the safety and stability construction of foundation ditch; The situation of the distortion of Cement-soil Gravity enclosure wall, cracking when so can not only solve muddy soft soil stratum foundation pit construction, can also reduction of erection time and save cost.
To achieve these goals, technical scheme of the present invention is:
A kind of soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method, described Cement-soil Gravity enclosure wall comprises cement-soil cylindrical strengthening body barricade and is anchored in the coping at barricade top, described Cement-soil Gravity enclosure wall is arranged at outside foundation ditch periphery, and described soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method comprises:
Step one, the off-load of foundation ditch active region, passive zone of pit back-pressure, and limit working load;
Step 2, crack repairing: adopt the method for dense concrete shutoff or water mixing glass compaction grouting or high pressure jet grouting to fill up reparation to the crack that described coping and described cement-soil cylindrical strengthening body barricade occur;
Step 3, strengthen described Cement-soil Gravity enclosure wall;
Step 4, formation rigidity support replacement mechanism: described foundation ditch bed course, with digging with watering, makes a concentrated effort to finish the pouring construction of sole plate, and tamps with plain concrete between described Cement-soil Gravity enclosure wall and described sole plate.
Further, described step one comprises the method adopting light well precipitation or trench digging to unload soil, reduces the Water And Earth Pressures of described foundation ditch active region.
Further, described light well precipitation method comprises goes along with sb. to guard him the some well-point pipes of outside laying along described Cement-soil Gravity enclosure wall dangerous situation region, filter pipe is set bottom described well-point pipe and inserts pervious layer, described well-point pipe top is connected with water header by flexible pipe, then by pumping equipment, water in described header is extracted out, thus reduce described foundation ditch active region groundwater table.
Further, described trench digging unload indigenous method be included in described Cement-soil Gravity enclosure wall dangerous situation region go along with sb. to guard him outside excavation some width 2 ~ 5m, the degree of depth is no more than the groove that foundation ditch digs dark 2/3, digs out the earthwork and transports outward in time, to reduce the direct earth pressure of described foundation ditch active region.
Further, described step one comprises the measure adopting interim back-pressure or the end, hole to reinforce, and improves described passive zone of pit drag.
Further, described interim back-pressure measure be included in described Cement-soil Gravity enclosure wall dangerous situation region hole in passive area the backfill earthwork or preloading sand bag, build native stone bag and dig dark At The Height to being not less than 1/2 foundation ditch, to balance horizontal stress inside and outside described foundation ditch.
Further, reinforcement measure at the bottom of described hole is included in described Cement-soil Gravity enclosure wall dangerous situation region and adopts cement mixing method or high-pressure rotary jet grouting pile or compaction grouting to carry out reinforcement compaction, the width >=4m of reinforcing, the degree of depth >=3m to described passive zone of pit hole end foundation soil.
Further, described soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method also comprises: control soil excavation: layering, segmentation, symmetry, balanced earth excavation, interim side slope classification is excavated and taked suitable bank protection measure; Described soil excavation lift height≤4m, section length≤30m, make excess pore water pressure evenly be discharged.
Further, the classification height≤4m of described interim side slope classification excavation, puts the slope gradient≤1:1.5, berm width >=1.5m between slope, and to domatic employing sprayed mortar bank protection.
Further, described step 3 is included in described Cement-soil Gravity enclosure wall to add beats soil nailing or anchor pole, and inserts steel sheet pile at described Cement-soil Gravity enclosure wall near the side of described foundation ditch.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
Soft clay area of the present invention Cement-soil Gravity enclosure wall dangerous situation processing method, the distortion caused because of discontinuity mainly for the treatment of foundation pit enclosure structure Cement-soil Gravity enclosure wall, cracking, threaten the situation of security of foundation ditch construction.The processing method of Cement-soil Gravity enclosure wall dangerous situation mainly comprises: to the outer precipitation in foundation ditch active region hole, unload soil, reduce the Water And Earth Pressures of foundation ditch active region, and limit the working load of foundation ditch active region; To passive zone of pit back-pressure, interim preloading, the end, hole, reinforce, and improve passive zone of pit drag; Take in time to fill up reclamation activities to the crack that coping and the wall body of Cement-soil Gravity enclosure wall occur; Employing sets the method for soil nailing or anchor pole or reinforces Cement-soil Gravity enclosure wall in the method for Cement-soil Gravity enclosure wall near the side of foundation ditch insertion steel sheet pile on Cement-soil Gravity enclosure wall; And complete the pouring construction of foundation ditch sole plate in time, tamp with plain concrete between Cement-soil Gravity enclosure wall and sole plate, form rigidity support replacement, keep the stability under loading of whole foundation ditch system.When preventing foundation pit construction in muddy soft soil stratum by this series of measure, Cement-soil Gravity enclosure wall causes foundation pit accident because the dangerous situation such as distortion, cracking, seepage worsens, control the deformation of Cement-soil Gravity enclosure wall, ensure the stability of Cement-soil Gravity enclosure wall, thus meet the safe construction requirement of base pit engineering.
Accompanying drawing explanation
Fig. 1 is Cement-soil Gravity enclosure wall layout schematic diagram;
Fig. 2 is that the A-A section of Fig. 1 arranges schematic diagram.
In figure: 1-Cement-soil Gravity enclosure wall, 2-passive zone of pit, 3-foundation ditch active region, 4-element concrete support replacement, 11-coping.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method 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.Need to illustrate in addition, 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.For sake of convenience, hereinafter described " on ", D score is consistent with the upper and lower direction of accompanying drawing, but this can not become the restriction of technical solution of the present invention.
Embodiment one
Soft clay area of the present invention Cement-soil Gravity enclosure wall dangerous situation processing method is described in detail below in conjunction with Fig. 1 to Fig. 2.
As depicted in figs. 1 and 2, Cement-soil Gravity enclosure wall 1 comprises the curing compound such as cement and foundation soil to stir by force and forms the cement-soil cylindrical strengthening body barricade of lap connection and the cast-in-place armored concrete coping 11 of barricade top stiffener anchoring, Cement-soil Gravity enclosure wall 1 keeps off native water-stopping structure as self-supporting, outside the periphery being arranged at foundation ditch.Cement-soil Gravity enclosure wall 1 is as the space enclosing structure of foundation ditch within the 5m degree of depth, often be used in soft clay area, but the weakness due to the quality problems of Cement-soil Gravity enclosure wall 1 body of wall itself or soil layer construction is responsive or foundation ditch excavation and construction time the reason such as to backbreak in violation of rules and regulations Cement-soil Gravity enclosure wall space enclosing structure can be caused to occur dangerous situation, if find not in time and remove the dangerous condition, serious foundation pit accident may be caused.Therefore, going along with sb. to guard him in the normal digging process of region foundation ditch at Cement-soil Gravity enclosure wall 1 that body of wall is sharply out of shape or the dangerous situation such as wall body cracking, seepage as occurred, emergency trouble shooting measures targetedly need be taked to prevent the initiation foundation pit accident that is worse off.The present invention is by the distinct inducement of Cement-soil Gravity enclosure wall dangerous situation, the geo-logical terrain feature in foundation pit construction place, a series for the treatment of measures are taked to control the dangerous circumstances, real-time monitoring according to the timely leak stopping reinforcement of the deformation of Cement-soil Gravity enclosure wall 1, make Cement-soil Gravity enclosure wall 1 be out of shape falling to stablize, reduce the risk of foundation pit construction, ensure construction safety.
The dangerous situation processing method of soft clay area Cement-soil Gravity enclosure wall 1, comprises the steps:
Continue with reference to figure 2, step one, foundation ditch active region 3 off-load, passive zone of pit 2 back-pressure, and limit the working load of foundation ditch active region 3.
Foundation ditch active region 3 refers to be positioned at outside Cement-soil Gravity enclosure wall 1 to the soil body outside the hole of fender body applying active earth pressure.Unloaded the Water And Earth Pressures of the method minimizing foundation ditch active region 3 of soil by light well precipitation or trench digging outside Cement-soil Gravity enclosure wall 1.Light well precipitation (Application of light well point precipitation) is namely gone along with sb. to guard him outside and is laid some well-point pipes according to the spacing of 1m along Cement-soil Gravity enclosure wall dangerous situation region, the two ends proper extension of well-point pipe, filter pipe is set bottom well-point pipe and inserts pervious layer, well-point pipe top is connected with water header by flexible pipe, water header is steel pipe, the whole body arranges the water suction mouth of pipe identical with well-point pipe spacing, then vacuum pump is passed through, water in header is extracted out by the pumping equipment such as centrifugal pump and header tank, thus reduce foundation ditch active region groundwater table, the water yield should be controlled and speed is avoided periphery road surface in Precipitation Process, pipelines etc. cause harmful effect.Trench digging unloads indigenous method and refers to that going along with sb. to guard him the outside some width of excavation along Cement-soil Gravity enclosure wall dangerous situation region is 2 ~ 5m, and the degree of depth is no more than 2/3 foundation ditch and digs dark groove, digs out the earthwork and transports outward in time, to reduce the direct earth pressure of foundation ditch active region 3.In order to ensure the stress balance of foundation ditch active region 3 further, forbidding the weight such as preloading reinforcing bar, earthwork within the scope of foundation ditch periphery 10m, must not walk loaded vehicle in Foundation Pit limit.
Simultaneously, when the slight dangerous situations such as Cement-soil Gravity enclosure wall 1 appearance cracking, distortion time, the measure that interim back-pressure or the end, hole can be adopted to reinforce at passive zone of pit 2, improves the drag of passive zone of pit 2, promotes Cement-soil Gravity enclosure wall 1 medial and lateral stress balance.Passive zone of pit 2 refers to be positioned at the hole soil body inside Cement-soil Gravity enclosure wall 1, fender body being applied to passive earth pressure.The passive area backfill earthwork or preloading sand bag in the hole that interim back-pressure measure is included in Cement-soil Gravity enclosure wall dangerous situation region, build native stone bag and dig dark At The Height to being not less than 1/2 foundation ditch, to balance horizontal stress inside and outside foundation ditch.Digging of foundation ditch refers to absolute altitude at the bottom of bed course and grade spacing deeply.Hole end reinforcement measure is included in Cement-soil Gravity enclosure wall dangerous situation region and adopts cement mixing method or high-pressure rotary jet grouting pile or compaction grouting to cheat end foundation soil to described passive zone of pit 2 to carry out reinforcement compaction, the width >=4m of reinforcing, the degree of depth >=3m.
Continue with reference to figure 2, step 2, crack repairing: the method for the crack employing dense concrete shutoff occurred coping 11 and Cement-soil Gravity enclosure wall 1, water mixing glass compaction grouting or high pressure jet grouting is repaired.
The coping 11 that the cement mixing method top of composition Cement-soil Gravity enclosure wall 1 is affixed is made up of steel concrete, and its thickness is 200mm.In order to the globality of refinforced cement soil gravity enclosure wall 1, the junction of cement mixing method and coping 11 is laid with reinforcing bar, steel pipe etc. and strengthens anchorage element.In soil mass of foundation pit uninstall process, during Cement-soil Gravity enclosure wall 1 inner side and outer side discontinuity, coping 11 can be caused to occur that drawing crack is stitched.Along with the carrying out of excavation of foundation pit, also may there is crack in earth's surface, Foundation Pit limit.Now, if crack developing degree is comparatively large, need to take in time to fill up reclamation activities.Meanwhile, should field control be strengthened, prevent surface water, rainwater etc. from infiltrating Cement-soil Gravity enclosure wall 1 dam body inside, thus ensure the stability of Cement-soil Gravity enclosure wall 1.
Continue with reference to figure 2, step 3, reinforcement Cement-soil Gravity enclosure wall 1: be included in Cement-soil Gravity enclosure wall 1 to add and beat soil nailing or anchor pole, and insert steel sheet pile at Cement-soil Gravity enclosure wall 1 near the side of foundation ditch, be intended to the strength and stiffness improving Cement-soil Gravity enclosure wall 1.
That is, if the more difficult control of foundation pit deformation situation, the mode such as soil nailing or anchor pole of optionally beating in Cement-soil Gravity enclosure wall 1 is reinforced Cement-soil Gravity enclosure wall 1 dam body itself.When carrying out beating nail Construction, normally inside Cement-soil Gravity enclosure wall 1, namely passive zone of pit 2 is that foundation ditch active region 3 direction is squeezed into, to strengthen stability and the fastness of Cement-soil Gravity enclosure wall 1 further outside Cement-soil Gravity enclosure wall 1.Preferably, steel sheet pile can also be inserted at Cement-soil Gravity enclosure wall 1 near the side of foundation ditch.
Certainly, soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method also comprises: control soil excavation: i.e. layering, segmentation, symmetry, balanced earth excavation, interim side slope classification is excavated and taked suitable bank protection measure; Soil excavation lift height≤4m, section length≤30m, make excess pore water pressure evenly be discharged.Classification height≤the 4m of interim side slope classification excavation, puts the slope gradient≤1:1.5, berm width >=1.5m between slope, and to domatic employing sprayed mortar bank protection.
Continue with reference to figure 2, step 4, formation rigidity support replacement mechanism: foundation ditch bed course, with digging with watering, makes a concentrated effort to finish the pouring construction of sole plate, and tamps by plain concrete support replacement 4 between Cement-soil Gravity enclosure wall 1 and sole plate.
After excavation of foundation pit completes, will complete the pouring construction of foundation ditch sole plate in time, the gap simultaneously between foundation ditch sole plate and Cement-soil Gravity enclosure wall 1 is built plain concrete support replacement 4 and is tamped, thus forms the support replacement mechanism of rigidity.According to design specifications, in order to set up carrying out smoothly of template when ensureing foundation ditch upper body structure construction, a constuction joint between foundation ditch sole plate and Cement-soil Gravity enclosure wall, can be reserved.Therefore, after soil mass of foundation pit unloading terminates and completes the construction of sole plate, for forming complete power transmission mechanism, ensureing the stability under loading of whole foundation ditch system, needing in time the plain concrete support replacement 4 of aforementioned reserved constuction joint to be tamped, forming rigidity support replacement.Certainly, during soil mass of foundation pit excavation construction, will organize foundation pit construction in strict accordance with design scheme and code requirement, adhere to layer and section symmetrical equilibrium ground earth excavation, interim side slope classification is excavated and is taked suitable bank protection measure; Soil excavation lift height≤4m, section length≤30m, make excess pore water pressure evenly be discharged.Meanwhile, should water in time when being excavated to substrate and smash bed course and sole plate, bed course is with digging with watering, reduce foundation ditch large area open-assembly time, be no more than 24 hours without bed course open-assembly time, thicken bed course if desired, adopt bed course arrangement of reinforcement or the support of the end, hole is set, to prevent hole subsoil body resilience protuberance.
In sum, soft clay area of the present invention Cement-soil Gravity enclosure wall dangerous situation processing method, mainly for the treatment of foundation pit enclosure structure Cement-soil Gravity enclosure wall because of the weakness of the quality problems of body of wall itself or soil layer construction is responsive or foundation ditch excavation and construction time to backbreak etc. that reason makes wall body discontinuity in violation of rules and regulations and the distortion, cracking etc. that cause threaten the situation of security of foundation ditch construction.The processing method of Cement-soil Gravity enclosure wall dangerous situation mainly comprises: to the off-load of foundation ditch active region, reduces the Water And Earth Pressures of foundation ditch active region, and limits the working load of foundation ditch active region; To passive zone of pit back-pressure, hole subsoil body is reinforced in interim preloading, improves passive area drag; Take in time to fill up reclamation activities to the crack that coping and the wall body of Cement-soil Gravity enclosure wall occur; And adopt the method that adds on Cement-soil Gravity enclosure wall and beat soil nailing or anchor pole or in Cement-soil Gravity enclosure wall to arrange steel sheet pile method near the side of foundation ditch, Cement-soil Gravity enclosure wall reinforced; Be exactly the pouring construction completing sole plate in time in addition, tamp with plain concrete between Cement-soil Gravity enclosure wall and sole plate, form rigidity support replacement mechanism, keep the stability under loading of whole foundation ditch system.When preventing foundation pit construction in muddy soft soil stratum by this series of measure, Cement-soil Gravity enclosure wall causes foundation pit accident because the dangerous situation such as distortion, cracking, seepage worsens, control the deformation of Cement-soil Gravity enclosure wall, ensure the stability of Cement-soil Gravity enclosure wall, thus meet the safe construction requirement of base pit engineering.Certainly; while use Cement-soil Gravity enclosure wall dangerous situation processing method of the present invention; want the method for mating information construction and Dynamic controlling; adjust order and the method for site operation according to the monitored data of Cement-soil Gravity enclosure wall and surrounding enviroment in good time; grasp the internal forces distribution of each ingredient of foundation ditch at any time; be beneficial to earlier scent a hidden danger, guarantee the stability and safety of base pit engineering.That is, if when in whole soil mass of foundation pit digging process, foundation ditch occurs that the distortion of seepage, Cement-soil Gravity enclosure wall is excessive, specific aim treatment measures should be taked in time, such as: adopt the outer precipitation of Foundation Pit, unload the Water And Earth Pressures that the measures such as soil reduce foundation ditch active region depending on concrete condition; At passive zone of pit surcharge reaction soil, reinforce hole subsoil body, to improve passive area drag; The emergency measures such as support, anchor structure are added to control the development of deformation of Cement-soil Gravity enclosure wall in wall body; And accelerate sole plate construction to form support replacement as early as possible, thus ensure the safety and stability construction of foundation ditch.
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. a soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method, described Cement-soil Gravity enclosure wall comprises cement-soil cylindrical strengthening body barricade and is anchored in the coping at barricade top, described Cement-soil Gravity enclosure wall is arranged at outside foundation ditch periphery, it is characterized in that, described soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method comprises:
Step one, the off-load of foundation ditch active region, passive zone of pit back-pressure, and limit working load;
Step 2, crack repairing: adopt the method for dense concrete shutoff or water mixing glass compaction grouting or high pressure jet grouting to fill up reparation to the crack that described coping and described cement-soil cylindrical strengthening body barricade occur;
Step 3, strengthen described Cement-soil Gravity enclosure wall;
Step 4, formation rigidity support replacement mechanism: described foundation ditch bed course, with digging with watering, makes a concentrated effort to finish the pouring construction of sole plate, and tamps with plain concrete between described Cement-soil Gravity enclosure wall and described sole plate.
2. soft clay area as claimed in claim 1 Cement-soil Gravity enclosure wall dangerous situation processing method, is characterized in that, described step one comprises the method adopting light well precipitation or trench digging to unload soil, reduces the Water And Earth Pressures of described foundation ditch active region.
3. soft clay area as claimed in claim 2 Cement-soil Gravity enclosure wall dangerous situation processing method, it is characterized in that, described light well precipitation method comprises goes along with sb. to guard him the some well-point pipes of outside laying along described Cement-soil Gravity enclosure wall dangerous situation region, filter pipe is set bottom described well-point pipe and inserts pervious layer, described well-point pipe top is connected with water header by flexible pipe, then by pumping equipment, water in described header is extracted out, thus reduce described foundation ditch active region groundwater table.
4. soft clay area as claimed in claim 2 Cement-soil Gravity enclosure wall dangerous situation processing method, it is characterized in that, described trench digging unload indigenous method be included in described Cement-soil Gravity enclosure wall dangerous situation region go along with sb. to guard him outside excavation some width 2 ~ 5m, the degree of depth is no more than the groove that foundation ditch digs dark 2/3, dig out the earthwork to transport outward in time, to reduce the direct earth pressure of described foundation ditch active region.
5. soft clay area as claimed in claim 1 Cement-soil Gravity enclosure wall dangerous situation processing method, is characterized in that, described step one comprises the measure adopting interim back-pressure or the end, hole to reinforce, and improves described passive zone of pit drag.
6. soft clay area as claimed in claim 5 Cement-soil Gravity enclosure wall dangerous situation processing method, it is characterized in that, the passive area backfill earthwork or preloading sand bag in the hole that described interim back-pressure measure is included in described Cement-soil Gravity enclosure wall dangerous situation region, build native stone bag and dig dark At The Height to being not less than 1/2 foundation ditch, to balance horizontal stress inside and outside described foundation ditch.
7. soft clay area as claimed in claim 5 Cement-soil Gravity enclosure wall dangerous situation processing method, it is characterized in that, reinforcement measure at the bottom of described hole is included in described Cement-soil Gravity enclosure wall dangerous situation region and adopts cement mixing method or high-pressure rotary jet grouting pile or compaction grouting to carry out reinforcement compaction, the width >=4m of reinforcing, the degree of depth >=3m to described passive zone of pit hole end foundation soil.
8. soft clay area as claimed in claim 1 Cement-soil Gravity enclosure wall dangerous situation processing method, it is characterized in that, described soft clay area Cement-soil Gravity enclosure wall dangerous situation processing method also comprises: control soil excavation: layering, segmentation, symmetry, balanced earth excavation, interim side slope classification is excavated and taked suitable bank protection measure; Described soil excavation lift height≤4m, section length≤30m, make excess pore water pressure evenly be discharged.
9. soft clay area as claimed in claim 8 Cement-soil Gravity enclosure wall dangerous situation processing method, it is characterized in that, the classification height≤4m of described interim side slope classification excavation, puts the slope gradient≤1:1.5, berm width >=1.5m between slope, and to domatic employing sprayed mortar bank protection.
10. soft clay area as claimed in claim 1 Cement-soil Gravity enclosure wall dangerous situation processing method, it is characterized in that, described step 3 is included in described Cement-soil Gravity enclosure wall to add beats soil nailing or anchor pole, and inserts steel sheet pile at described Cement-soil Gravity enclosure wall near the side of described foundation ditch.
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| CN112982427A (en) * | 2021-03-22 | 2021-06-18 | 云南建投第一勘察设计有限公司 | Reinforcement construction method for foundation pit dangerous case in soft soil area |
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| 叶建尧等: "软土深基坑围护的应急措施", 《浙江建筑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982427A (en) * | 2021-03-22 | 2021-06-18 | 云南建投第一勘察设计有限公司 | Reinforcement construction method for foundation pit dangerous case in soft soil area |
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