CN103835281A - Method for fast determining strengthening scheme for shield to pass through soft foundation dike - Google Patents
Method for fast determining strengthening scheme for shield to pass through soft foundation dike Download PDFInfo
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- CN103835281A CN103835281A CN201310668565.2A CN201310668565A CN103835281A CN 103835281 A CN103835281 A CN 103835281A CN 201310668565 A CN201310668565 A CN 201310668565A CN 103835281 A CN103835281 A CN 103835281A
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Abstract
The invention relates to a method for fast determining a strengthening scheme for a shield to pass through a soft foundation dike. The method is characterized in that the effect of the shield construction on the dike is fast determined through a two-dimensional plane side slope stability program, the position of a worst strengthening body is found out according to the stress transfer principle, the width of the strengthening body is worked out according to the stress transfer principle, the equivalent strengthening principle is utilized to ensured that the safety performance and stability of the dike are not reduced, anti-skidding force, borne for strengthening, of the strengthening body is worked out according to the two-dimensional plane side slope stability program, and on that basis, the thickness of the strengthening body is determined. The method has the advantages that the strengthening range can be prevented from being expanded at will in a man-made mode according to the equivalent strengthening principle, and therefore resources and materials cannot be wasted; meanwhile, the mechanics concept is clear and can be mastered by a project planner conveniently.
Description
Technical field
What the present invention relates to is a kind of Scheme of Strengthening definite method fast that shield structure passes through soft foundation dyke, this method adopts equivalent reinforcement principle, the adverse effect of thrust in consideration shield-tunneling construction process to dyke security and stability, have mechanical concept clear and definite, determine the features such as method is easy, facilitate hydraulic engineering technician to determine fast Scheme of Strengthening.Belong to the protection field of underground engineering construction to surrounding enviroment.
Background technology
At present, may cause adverse influence to hydraulic engineering dyke and flood passage etc. for the construction of tunnel of passing through dyke building, must carry out flood influence evaluation, to guarantee dyke building and river course flood safety.Under normal circumstances, engineering water conservancy technician, lacks underground construction and construction of tunnel construction experiences, according to similar engineering experience, the impact that may cause for tunnel construction is too exaggerated, and often requires to expand reinforcing scope, increases larger engineering construction cost, even incurs loss through delay the duration.At present, the Qinhuaihe River, Nanjing dyke building was reinforced and landscape planting work before 10 years.Along with city, Nanjing popularization, after Metro Line 1 in Nanjing and No. 2 lines successfully pass through the Qinhuaihe River, No. 11 lines of subway have successfully passed through Chunhe river recently, and No. 3 lines of Line of Nanjing Subway, No. 6 line construction also will be passed through the Qinhuaihe River.Along with west of a river exploitation develops in depth, electric power tunnel, the dirty shunting of the rain engineering of passing through the Qinhuaihe River also increased in recent years gradually, Xiaguan Area, Nanjing 220KV harbour transformer station power transmission engineering shield structure is worn the Qinhuaihe River, Nanjing 220kV change-Ninghai road power transformation cable work transmission line shield structure that takes it easy and is passed through the outer Qinhuaihe River, and the dirty shunting of Nanjing rain engineering Hong Wu road push pipe passes through outer Qinhuaihe River construction of tunnel etc.
Summary of the invention
What the present invention proposed is a kind of Scheme of Strengthening definite method fast that shield structure passes through soft foundation dyke, its object is intended to overcome the existing above-mentioned defect of prior art, adopt stability of slope program, first according to shield structure thrust, dyke security and stability is changed with shield structure present position is different, find out the shield structure present position when the most dangerous to dyke safety and stability, simultaneously according to shield structure thrust, the transfer principle in stratum determines that antislide pile reinforces the width of position and reinforcing body, then according to the equivalent reinforcement principle being consistent with the security and stability of former dyke, by the thickness of stability of slope calculative determination reinforcing body.The features such as this method has simply, strong operability, are convenient to for project planner grasps, and have higher economy.
Technical solution of the present invention: a kind of shield structure passes through Scheme of Strengthening definite method fast of soft foundation dyke, comprises the steps:
1) determine fast the impact of shield-tunneling construction on dyke by stability of slope program, and according to stress transfer principle, finding out optimum reinforcing body present position;
2) obtain the width of reinforcing body according to stress transfer principle;
3) according to equivalent reinforcement principle, guarantee not reduce on the security and stability basis of dyke by stability of slope program and obtain the skid resistance that the reinforcing of reinforcing body should be carried, on this basis, determine the thickness of reinforcing body.
Advantage of the present invention and effect are: a kind of definite method that has proposed physical mechanics clear concept, equivalent reinforcing scheme simple to operate, that easily grasp for numerous engineers and technicians.Adopt the concept of equivalent reinforcement to solve the not rationality that reinforcing scope blindly expands, also comparatively easily accepted by river management department simultaneously.Due to the method adopt be the two dimensional surface stability of slope calculation procedure familiar by numerous engineers and technicians, be easily numerous engineers and technicians and grasp.
Accompanying drawing explanation
Accompanying drawing 1 is embodiment of the present invention A figure.
Accompanying drawing 2 is embodiment of the present invention B figure.
The specific embodiment
Shield structure passes through a Scheme of Strengthening definite method fast for soft foundation dyke, comprises the steps:
1) determine fast the impact of shield-tunneling construction on dyke by stability of slope program, and according to stress transfer principle, finding out optimum reinforcing body present position;
2) obtain the width of reinforcing body according to stress transfer principle;
3) according to equivalent reinforcement principle, guarantee not reduce on the security and stability basis of dyke by stability of slope program and obtain the skid resistance that the reinforcing of reinforcing body should be carried, on this basis, determine the thickness of reinforcing body.
Described stress transmission, is closely-related with soil body mechanical characteristic, can determine according to the modulus of compressibility of foundation soil, and reference " Code for design of building " is about foundation pressure angle of flare form.
The reinforcing body location positioning of described optimum, first dyke security and stability corresponding to different position of living in when obtaining shield structure and passing through dyke, next finds out the corresponding shield machine of dyke minimum safe coefficient of stability position, simultaneously according to foundation stress transfer principle, shield machine thrust is extended to dyke according to angle of flare domatic upper, be reinforcing body optimum position.
Described reinforcing body can be deep-mixed pile, high-pressure rotary jet grouting pile or prefabricated tubular pile.
Embodiment
Certain subway shield tunnel project passes through Chunhe river, and ground is deep Muddy Bottoms farinose argillic horizon.Construction method adopts earth pressure balanced shield engineering method, and diameter is 6.2m.Dyke upstream face slope is than 1:3, the high about 10.0m of dyke.Tunnel is at korneforos the minimum depth 6.0m.The modulus of compressibility 2.0MPa of weak foundation soil, intensity parameter cohesion 5kPa, 10.1 ° of angle of internal friction.
Check standard for foundation, draw under soft stratum condition, shield structure thrust power transmission angle of flare in ground is 30 °.According to two dimension slope computational analysis, known when shield driving is to before riverbed bottom when 28.0m, the security and stability of dyke is minimum, is reduced to 1.222(is illustrated in fig. 1 shown below from 1.49), dyke security and stability is had to larger weakening.According to foundation stress diffusion transfer principle, can obtain reinforcing body by geometrical relationship and be illustrated in fig. 2 shown below apart from the position 18.0m(of toe).Can determine that according to stress transfer principle the width of reinforcing body is 17.7m, then according to equivalent reinforcement principle, in the time that dyke buckling safety factor returns to 1.49, stability of slope calculates the body that needs reinforcement anti-thrust 230kN/m is provided.This engineering reinforcement method adopts high-pressure rotary jet grouting pile, requires more than the unconfined compression strength of pile body reaches 1.0MPa, and more than the shear strength of pile body reaches 230kN/m, the thickness minimum of pile body is 1.5m.Last engineering has adopted
existingthe reinforcement means of high-pressure rotary jet grouting pile, reinforcing body width 18m, reinforcing body thickness 2.0m, before shield-tunneling construction, carry out embankment reinforcement processing, when shield-tunneling construction, do not produce dyke adverse influence, there is not the crack that seeps water in dyke, has obtained good economic effect and social effect yet.
Claims (4)
1. shield structure passes through a Scheme of Strengthening definite method fast for soft foundation dyke, it is characterized in that the method comprises the steps:
1) determine fast the impact of shield-tunneling construction on dyke by stability of slope program, and according to stress transfer principle, finding out optimum reinforcing body present position;
2) obtain the width of reinforcing body according to stress transfer principle;
3) according to equivalent reinforcement principle, guarantee not reduce on the security and stability basis of dyke by stability of slope program and obtain the skid resistance that the reinforcing of reinforcing body should be carried, on this basis, determine the thickness of reinforcing body.
2. a kind of shield structure according to claim 1 passes through Scheme of Strengthening definite method fast of soft foundation dyke, it is characterized in that described stress transmission, closely-related with soil body mechanical characteristic, can determine according to the modulus of compressibility of foundation soil, reference " Code for design of building " is about foundation pressure angle of flare form.
3. a kind of shield structure according to claim 1 passes through Scheme of Strengthening definite method fast of soft foundation dyke, it is characterized in that the reinforcing body location positioning of described optimum, first dyke security and stability corresponding to different position of living in when obtaining shield structure and passing through dyke, next finds out the corresponding shield machine of dyke minimum safe coefficient of stability position, simultaneously according to foundation stress transfer principle, shield machine thrust is extended to dyke according to angle of flare domatic upper, be reinforcing body optimum position.
4. a kind of shield structure according to claim 1 passes through Scheme of Strengthening definite method fast of soft foundation dyke, it is characterized in that described reinforcing body, can be deep-mixed pile, high-pressure rotary jet grouting pile or prefabricated tubular pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310668565.2A CN103835281B (en) | 2013-12-11 | 2013-12-11 | A kind of method that Scheme of Strengthening of shield crossing soft foundation dyke is determined fast |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310668565.2A CN103835281B (en) | 2013-12-11 | 2013-12-11 | A kind of method that Scheme of Strengthening of shield crossing soft foundation dyke is determined fast |
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| CN103835281A true CN103835281A (en) | 2014-06-04 |
| CN103835281B CN103835281B (en) | 2015-08-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104120677A (en) * | 2014-07-04 | 2014-10-29 | 河海大学 | Method for dike side slope two-dimensional safety and stability analysis taking shield pass-through influences into consideration |
| CN109026022A (en) * | 2018-08-20 | 2018-12-18 | 中铁十二局集团有限公司 | It is a kind of for floating the ruggedized construction and reinforcement means in pebble layer shield crossing river |
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| CN101566063A (en) * | 2009-06-04 | 2009-10-28 | 上海交通大学 | Method of reinforcing soil body for inlet and outlet cave mouths of tunnel shield |
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| JP2003261930A (en) * | 2002-03-12 | 2003-09-19 | Penta Ocean Constr Co Ltd | Consolidation improvement method for water bottom soft ground |
| JP2004316125A (en) * | 2003-04-11 | 2004-11-11 | Taisei Corp | Work execution method for large sectional tunnel and deformed section shield machine |
| CN101408109A (en) * | 2008-11-27 | 2009-04-15 | 浙江省电力设计院 | Diversion shield tunnel traversing new sea dyke and foundation treatment method thereof |
| CN101566063A (en) * | 2009-06-04 | 2009-10-28 | 上海交通大学 | Method of reinforcing soil body for inlet and outlet cave mouths of tunnel shield |
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| 吴韬等: ""大型盾构出洞区加固土体稳定性研究"", 《地下空间与工程学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104120677A (en) * | 2014-07-04 | 2014-10-29 | 河海大学 | Method for dike side slope two-dimensional safety and stability analysis taking shield pass-through influences into consideration |
| CN104120677B (en) * | 2014-07-04 | 2016-01-06 | 河海大学 | Consider the side slope ot the embankment two-dimensional Security method for analyzing stability of shield crossing impact |
| CN109026022A (en) * | 2018-08-20 | 2018-12-18 | 中铁十二局集团有限公司 | It is a kind of for floating the ruggedized construction and reinforcement means in pebble layer shield crossing river |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103835281B (en) | 2015-08-05 |
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Address after: 15 Building 5, water conservancy building, No. 210029, Shanghai Road, Nanjing, Jiangsu Patentee after: Jiangsu water conservancy engineering science and technology consulting Limited by Share Ltd Address before: 601 room 9, Jiangsu water conservancy training center, No. 210029, Shanghai Road, Jiangsu, Nanjing Patentee before: JIANGSU PROVINCE WATER ENGINEERING SCI-TECH CONSULTING CO., LTD. |