CN103266616A - Retaining-structure internal-force and risk assessment method and system based on inclinometer data - Google Patents

Retaining-structure internal-force and risk assessment method and system based on inclinometer data Download PDF

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CN103266616A
CN103266616A CN2013102220514A CN201310222051A CN103266616A CN 103266616 A CN103266616 A CN 103266616A CN 2013102220514 A CN2013102220514 A CN 2013102220514A CN 201310222051 A CN201310222051 A CN 201310222051A CN 103266616 A CN103266616 A CN 103266616A
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enclosing structure
space enclosing
moment
risk assessment
deviational survey
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CN103266616B (en
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陈锦剑
程仕远
王建华
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Abstract

The invention discloses a retaining-structure internal-force and risk assessment method and system based on inclinometer data. The retaining-structure internal-force and risk assessment method comprises the following steps of determining the interval between every two horizontal displacement measurement points and horizontal displacement distribution in the depth direction of a retaining structure according to the inclinometer data, determining geometrical parameters, mechanical parameters and support intervals of the retaining structure, based on the unit deflection method, working out unit bending moment of the retaining structure according to the inclinometer data and the obtained geometrical parameters and mechanical parameters, and synthesizing displacement of piles and the distribution condition of bending moment to conduct comprehensive risk assessment on the retaining structure. By the adoption of the retaining-structure internal-force and risk assessment method and system based on the inclinometer data, internal-force characteristics of the retaining structure can be worked out conveniently, rapidly and effectively, and the risk state of a foundation pit can be assessed.

Description

Internal force and methods of risk assessment and system based on the space enclosing structure of deviational survey data
Technical field
The present invention is about a kind of internal force and methods of risk assessment and system of space enclosing structure, particularly relates to a kind of internal force and methods of risk assessment and system of the space enclosing structure based on the deviational survey data.
Background technology
The utilization of urban underground space and the rise of highrise building have brought a large amount of deep-foundation pit engineerings.The city base pit engineering is constantly to Shenzhen Development Bank, and scale is increasing, and underground utilities and construction of structures are adjoined mutually, and construction period is tight, causes difficulty of construction also obviously to be increased.Foundation pit enclosure structure mainly bears water and soil pressure that the excavation of foundation pit off-load produces and ground overload etc., and this pressure is delivered to support, is the interim wall-retaining structure of a kind of construction of stablizing foundation ditch.Though the calculated value of its internal force the time has provided in design, in the digging process the actual moment of flexure of space enclosing structure often with calculated value gap to some extent.Along with deep foundation ditch constantly develops, these difference are obvious further, and the safety of space enclosing structure is ever more important also, are important indicators weighing the foundation ditch risk.
Foundation ditch risk alarm at present generally adopts deviational survey intuitively to report to the police, and displacement result is only arranged, and does not reflect the internal force feature.So exist following deficiency: 1, risk indicator is combined with mechanical calculation inadequately.Risk indicator often obtains by subjective methods such as expert surveys, lacks the necessary analysis of mathematics theory of mechanics and scene or laboratory test, makes the reliability of risk indicator and accuracy have a greatly reduced quality.2, do not set up perfect Risk-warning prediction scheme system.Present early warning prediction scheme system does not move towards systematization and sequencing as yet, monitored data and warning index is not carried out organic combination.In fact the safety and stablization of foundation ditch self are to be determined by the internal force state of space enclosing structure, more need to consider the synthetic relationship of displacement and internal force when carrying out risk assessment.
Therefore it is limited to be limited to present monitoring level, monitor very difficultly to the internal force of space enclosing structure, need calculate by other indirect methods, as adopt the method for indirect reckoning moment of flexure.At present, the method for calculating moment of flexure indirectly generally has two kinds: reinforcing bar meter stress predication method and displacement curve fitting process.
Reinforcing bar meter stress predication method is calculated indirectly for adopting the reinforcing bar meter.Because the reinforcing bar meter needs welding before use, can take place during use to cause the destruction situation that comes off with the cement contact friction, adds influences such as variations in temperature, causes the data misalignment, and is often excessive with the true stress deviation.
The displacement curve fitting process is the another kind of method of calculating moment of flexure.This method is reduced to plane strain problems with diaphragm wall, is used as the depth beam on the ground, and thinks and can regard pure camber beam as.Be similar to line of deflection by match by the method that measuring point constitutes curvature of curve, calculate ground-connecting-wall cross section moment of flexure again.In with displacement curve fitting process formula, the curvature φ that is out of shape for enclosure wall is the individual facile numerical value of not allowing.The people was once arranged at present by with 6 order polynomials the deviational survey of space enclosing structure being carried out the linear least square match, once the someone was by introducing the underground enclosure wall curvature of fairing batten (improved natural spline algorithm) inverse, yet, this method needs iteration when calculating, also need to judge the weight between approaching property and the slickness, mathematics is required height, can not extensive use in actual engineering.
Summary of the invention
For overcoming the deficiency that above-mentioned prior art exists, the present invention's purpose is to provide a kind of internal force and methods of risk assessment and system of the space enclosing structure based on the deviational survey data, can simple and direct effective calculating space enclosing structure internal force feature, assess the foundation ditch risk status.
For reaching above-mentioned and other purpose, the present invention proposes a kind of internal force and methods of risk assessment of the space enclosing structure based on the deviational survey data, comprises the steps:
Step 1 determines that according to the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute;
Step 2 is determined geometry and mechanics parameter and the support interval of this space enclosing structure;
Step 3 according to geometry and the mechanics parameter of these deviational survey data and acquisition, utilizes the unit flexibility method to calculate this space enclosing structure unit moment of flexure situation; And
Step 4, the displacement of comprehensive stake and moment of flexure distribution situation are carried out the integrated risk assessment to this space enclosing structure.
Further, in step 1, this space enclosing structure distributes by being installed in deviational survey pipe and slip inclinometer or the acquisition of fixed inclinometer in the tested space enclosing structure along the horizontal movement on the depth direction.
Further, the geometric parameter of this space enclosing structure is the space enclosing structure cross sectional shape, and mechanics parameter is modulus of elasticity and bending resistance moment of inertia.
Further, this unit calculation of Bending Moment method is:
M i = 8 EI l 2 y Pi
Wherein, M iBe i place unit moment of flexure, l is calculated length, y PiBe unit amount of deflection in the calculated length.
Further, the value of calculated length l need be considered spacing and the twice support interval of horizontal movement measuring point.
Further, calculated length l value is 2 meters～4 meters.
Further, unit amount of deflection computational methods are in the calculated length:
y Pi = y i - 1 2 ( y i - 1 + y i + 1 )
Wherein, y iBe calculated length mid point i place's space enclosing structure displacement, y I-1, y I+1Be respectively two ends space enclosing structure displacement up and down in the calculated length.
Further, in step 4, according to the displacement of this space enclosing structure and the moment of flexure of unit flexibility method calculating gained, allow maximum displacement and allow maximum to resist bending moment ratio with standard respectively, if exceeding maximum displacement is conventional risk, be serious risk if exceed maximum opposing moment of flexure.
For reaching above-mentioned and other purpose, the present invention also provides a kind of internal force and risk evaluating system of the space enclosing structure based on the deviational survey data, comprises at least:
Spacing and horizontal movement distribute and determine module, determine that according to the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute;
Parameter and support interval are determined module, are used for determining geometry and mechanics parameter and the support interval of space enclosing structure;
The moment of flexure distribution situation is calculated module, according to geometry and the mechanics parameter of these deviational survey data and acquisition, utilizes the unit flexibility method to calculate the moment of flexure distribution situation of space enclosing structure; And
The risk assessment module, displacement and the moment of flexure distribution situation of comprehensive stake are carried out risk assessment to space enclosing structure.
Further, this risk assessment module is according to the displacement of this space enclosing structure and the moment of flexure of calculating gained, allowing maximum displacement with standard respectively and allow maximum opposing bending moment ratio, if exceeding maximum displacement is conventional risk, is serious risk if exceed maximum opposing moment of flexure.
Compared with prior art, internal force and methods of risk assessment and the system of a kind of space enclosing structure based on the deviational survey data of the present invention, determine that by the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute, determine geometry and mechanics parameter and the support interval of space enclosing structure, according to deviational survey data and how much and mechanics parameter, calculate space enclosing structure unit moment of flexure situation with the unit flexibility method, and displacement and the moment of flexure distribution situation of comprehensive stake are carried out risk assessment to space enclosing structure, the simple and direct effective calculating space enclosing structure internal force feature of energy, assessment foundation ditch risk status.
Description of drawings
Fig. 1 is the internal force of a kind of space enclosing structure based on the deviational survey data of the present invention and the flow chart of steps of methods of risk assessment;
Fig. 2 is the schematic diagram of unit amount of deflection computational methods in the calculated length in the preferred embodiment of the present invention; ,
Fig. 3 is the internal force of a kind of space enclosing structure based on the deviational survey data of the present invention and the system architecture diagram of risk evaluating system;
Fig. 4 a and Fig. 4 b are deviational survey figure and the calculated bending moment figure of preferred embodiment of the present invention.
The specific embodiment
Below by specific instantiation and accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the content that this manual discloses.The present invention also can be implemented or be used by other different instantiation, and the every details in this manual also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.
Fig. 1 is the internal force of a kind of space enclosing structure based on the deviational survey data of the present invention and the flow chart of steps of methods of risk assessment.As shown in Figure 1, internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data of the present invention comprise the steps:
Step 101 determines that according to the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute.
In preferred embodiment of the present invention, space enclosing structure obtains by being installed in deviational survey pipe in the tested space enclosing structure and slip inclinometer or fixed inclinometer along the depth direction top offset.
Step 102 is determined how much of space enclosing structures and mechanics parameter and support interval.Specifically, the space enclosing structure geometric parameter is the space enclosing structure cross sectional shape, and mechanics parameter is elastic modulus E and bending resistance moment of inertia I.
Step 103 according to geometry and the mechanics parameter of deviational survey data and acquisition, utilizes the unit flexibility method to calculate space enclosing structure moment of flexure distribution situation.Below will describe the unit calculation of Bending Moment method among the present invention in detail.
Space enclosing structure is separated into some segments along depth direction, and wherein the unit moment of flexure of every segment is:
M i = 8 EI l 2 y Pi
Wherein, M iBe i place unit moment of flexure, l is calculated length, y PiBe unit amount of deflection in the calculated length.
Particularly, calculated length l considers spacing and the twice support interval of horizontal movement measuring point, and the general recommendations value is 2 meters～4 meters.
As shown in Figure 2, unit amount of deflection computational methods are in the calculated length:
y Pi = y i - 1 2 ( y i - 1 + y i + 1 )
Wherein, y iBe calculated length mid point i place's space enclosing structure displacement, y I-1, y I+1Be respectively two ends space enclosing structure displacement up and down in the calculated length.
Step 104, displacement and the moment of flexure distribution situation of comprehensive stake are carried out risk assessment to space enclosing structure.
In preferred embodiment of the present invention, calculate the gained moment of flexure according to space enclosing structure displacement and unit flexibility method, the maximum opposing bending moment ratio of the maximum displacement that allows with standard and permission if exceeding maximum displacement is conventional risk, is serious risk if exceed maximum opposing moment of flexure respectively.
Fig. 3 is the internal force of a kind of space enclosing structure based on the deviational survey data of the present invention and the system architecture diagram of risk evaluating system.As shown in Figure 3, internal force and the risk evaluating system of a kind of space enclosing structure based on the deviational survey data of the present invention comprise at least: spacing and horizontal movement distribute and determine that module 301, parameter and support interval determine that module 302, moment of flexure distribution situation calculate module 303 and risk assessment module 304.
Wherein, spacing and the definite module 301 of horizontal movement distribution determine that according to the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute, in preferred embodiment of the present invention, space enclosing structure obtains by being installed in deviational survey pipe in the tested space enclosing structure and slip inclinometer or fixed inclinometer along the depth direction top offset; Parameter and support interval determine that module 302 is used for determining geometry and mechanics parameter and the support interval of space enclosing structure, and here, the geometric parameter of space enclosing structure is the space enclosing structure cross sectional shape, and mechanics parameter is elastic modulus E and bending resistance moment of inertia I; The moment of flexure distribution situation is calculated module 303 according to geometry and the mechanics parameter of deviational survey data and acquisition, utilizes the unit flexibility method to calculate the moment of flexure distribution situation of space enclosing structure.Specifically, the moment of flexure distribution situation is calculated module 303 space enclosing structure is separated into some segments along depth direction, and wherein the unit moment of flexure of every segment is:
M i = 8 EI l 2 y Pi
Wherein, M iBe i place unit moment of flexure, l is calculated length, y PiBe unit amount of deflection in the calculated length.
In preferred embodiment of the present invention, calculated length l considers spacing and the twice support interval of horizontal movement measuring point, and the suggestion value is 4 meters.Unit amount of deflection computational methods are in the calculated length:
y Pi = y i - 1 2 ( y i - 1 + y i + 1 )
Wherein, y iBe calculated length mid point i place's space enclosing structure displacement, y I-1, y I+1Be respectively two ends space enclosing structure displacement up and down in the calculated length.
Displacement and the moment of flexure distribution situation of the 304 comprehensive stakes of risk assessment module are carried out risk assessment to space enclosing structure.In preferred embodiment of the present invention, risk assessment module 304 is according to the displacement of space enclosing structure and the moment of flexure of unit flexibility method calculating gained, allow maximum displacement with standard respectively and allow maximum opposing bending moment ratio, if exceeding maximum displacement is conventional risk, be serious risk if exceed maximum opposing moment of flexure.
Below will further specify the present invention according to an instantiation.Example:
The test site is certain construction of tunnel excavation of foundation pit.The darkest 14m that reaches of excavation of foundation pit adopts Φ 850mmSMW to go along with sb. to guard him, and interpolation 700 * 300 * 13 * 24mm H shaped steel inserts two every one.
Calculate with risk assessment concrete grammar and step as follows at SMW worker's method stake internal force to be assessed
1) obtain the deviational survey value by the deviational survey pipe of surveying in the space enclosing structure, shown in Fig. 4 (a), wherein maximum displacement is 38.5mm.
2) according to constructure scheme, determine SMW worker's method stake elastic modulus E=206000, bending resistance moment of inertia I=197000cm 4
3) with space enclosing structure displacement data and geometric mechanics parameter substitution unit flexibility method formula, getting calculated length l by suggestion is 4m, determines space enclosing structure moment of flexure distribution situation, and shown in Fig. 4 (b), wherein maximal bending moment is 1344.69kNm
4) the maximum sidesway aggregate-value of three grades of foundation ditches of regulation can not surpass cutting depth 0.4% in the standard, is 56mm, and this does not exceed standard.During the surrender of space enclosing structure total cross-section, can bear maximal bending moment is 1038.24kNm.Maximal bending moment has surpassed this value now.
So there is serious risk in space enclosing structure.
In sum, internal force and methods of risk assessment and the system of a kind of space enclosing structure based on the deviational survey data of the present invention, determine that by the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute, determine geometry and mechanics parameter and the support interval of space enclosing structure, according to deviational survey data and how much and mechanics parameter, calculate space enclosing structure unit moment of flexure situation with the unit flexibility method, and displacement and the moment of flexure distribution situation of comprehensive stake are carried out risk assessment to space enclosing structure, the simple and direct effective calculating space enclosing structure internal force feature of energy, assessment foundation ditch risk status.Because method of the present invention only need just can dynamically obtain instant moment of flexure and foundation ditch integrated risk state by on-the-spot inclination monitoring data, appraisal procedure is simple, and the result is more accurate than conventional deviational survey appraisal procedure directly perceived.
The present invention has following advantage:
(1) because method of the present invention is passed through the actual monitoring data, in conjunction with space enclosing structure self geometric mechanics parameter, by the unit flexibility method, thus the moment of flexure of accurate Calculation space enclosing structure.
(2) principle of the invention is simple, has the computational accuracy advantages of higher, can increase economic efficiency, and has strong practicality.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not is used for restriction the present invention.Any those skilled in the art all can be under spirit of the present invention and category, and above-described embodiment is modified and changed.Therefore, the scope of the present invention should be listed as claims.

Claims (10)

1. internal force and methods of risk assessment based on the space enclosing structure of deviational survey data comprise the steps:
Step 1 determines that according to the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute;
Step 2 is determined geometry and mechanics parameter and the support interval of this space enclosing structure;
Step 3 according to geometry and the mechanics parameter of these deviational survey data and acquisition, utilizes the unit flexibility method to calculate this space enclosing structure unit moment of flexure situation; And
Step 4, the displacement of comprehensive stake and moment of flexure distribution situation are carried out the integrated risk assessment to this space enclosing structure.
2. internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data as claimed in claim 1, it is characterized in that: in step 1, this space enclosing structure distributes by being installed in deviational survey pipe and slip inclinometer or the acquisition of fixed inclinometer in the tested space enclosing structure along the horizontal movement on the depth direction.
3. internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data as claimed in claim 1, it is characterized in that: the geometric parameter of this space enclosing structure is the space enclosing structure cross sectional shape, mechanics parameter is modulus of elasticity and bending resistance moment of inertia.
4. internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data as claimed in claim 1 is characterized in that this unit calculation of Bending Moment method is:
M i = 8 EI l 2 y Pi
Wherein, M iBe i place unit moment of flexure, l is calculated length, y PiBe unit amount of deflection in the calculated length.
5. internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data as claimed in claim 4, it is characterized in that: the value of calculated length l need be considered spacing and the twice support interval of horizontal movement measuring point.
6. internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data as claimed in claim 5, it is characterized in that: calculated length l value is 2 meters～4 meters.
7. internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data as claimed in claim 4 is characterized in that, unit amount of deflection computational methods are in the calculated length:
y Pi = y i - 1 2 ( y i - 1 + y i + 1 )
Wherein, y iBe calculated length mid point i place's space enclosing structure displacement, y I-1, y I+1Be respectively two ends space enclosing structure displacement up and down in the calculated length.
8. internal force and the methods of risk assessment of a kind of space enclosing structure based on the deviational survey data as claimed in claim 1, it is characterized in that: in step 4, according to the displacement of this space enclosing structure and the moment of flexure of unit flexibility method calculating gained, allow maximum displacement with standard respectively and allow maximum opposing bending moment ratio, if exceeding maximum displacement is conventional risk, be serious risk if exceed maximum opposing moment of flexure.
9. internal force and risk evaluating system based on the space enclosing structure of deviational survey data comprise at least:
Spacing and horizontal movement distribute and determine module, determine that according to the deviational survey data spacing of horizontal movement measuring point on the space enclosing structure depth direction and horizontal movement distribute;
Parameter and support interval are determined module, are used for determining geometry and mechanics parameter and the support interval of space enclosing structure;
The moment of flexure distribution situation is calculated module, according to geometry and the mechanics parameter of these deviational survey data and acquisition, utilizes the unit flexibility method to calculate the moment of flexure distribution situation of space enclosing structure; And
The risk assessment module, displacement and the moment of flexure distribution situation of comprehensive stake are carried out risk assessment to space enclosing structure.
10. internal force and the risk evaluating system of a kind of space enclosing structure based on the deviational survey data as claimed in claim 9, it is characterized in that: this risk assessment module is according to the displacement of this space enclosing structure and the moment of flexure of calculating gained, allow maximum displacement with standard respectively and allow maximum opposing bending moment ratio, if exceeding maximum displacement is conventional risk, be serious risk if exceed maximum opposing moment of flexure.
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CN103984995A (en) * 2014-05-20 2014-08-13 上海建科工程咨询有限公司 Judgment method of deep foundation pit engineering risk early-warning index based on benefit-danger balance point
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CN116929617A (en) * 2023-07-04 2023-10-24 广东省建设工程质量安全检测总站有限公司 Novel support pile curvature and bending moment monitoring method
CN116929617B (en) * 2023-07-04 2024-03-22 广东省建设工程质量安全检测总站有限公司 Novel support pile curvature and bending moment monitoring method

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