CN106370329A - Roller compacted concrete dam structural condition monitoring system and monitoring method - Google Patents

Abstract

The invention discloses a roller compacted concrete dam structural condition monitoring system and monitoring method. The system comprises a structural condition monitoring apparatus and a bending adjustment apparatus, and the structural condition monitoring apparatus is connected with the bending adjustment apparatus through a temperature sensing fiber. Based on temperature information obtained by the temperature sensing fiber, differences between a roller compacted concrete dam body and bedding plane thermal parameters are taken into consideration, calculation analysis is carried out based on equivalent analysis of such thermal parameters as a roller compacted concrete online expansion coefficient, specific heat and the like by use of a finite element temperature strain increment calculation form, at the same time, linear strain and tangent strain which are caused to a bedding plane and the body of a roller compacted concrete dam due to the differences of the thermal parameters are also taken into consideration, the structural condition of the roller compacted concrete dam is analyzed and evaluated, based on distributed monitoring of the temperature sensing fiber, the monitoring capability is greatly improved, the demand for actual structural condition diagnosis of the roller compacted concrete dam is well satisfied, and an important guarantee is provided for current roller compacted concrete dam structural condition health monitoring study.

Description

A kind of RCCD structure behaviour monitoring system and monitoring method

Technical field

The present invention relates to a kind of monitoring system of RCCD structure behaviour and method, belong to Hydraulic Projects structure peace Full health monitoring field.

Background technology

It is estimated that built, mixed in rolling of building since China successfully built up First RCCD from 1986 About 50 about, solidifying earth dam, is that China's dam work develops one of promising dam type.Built in the recent period, build building and will go into operation If high more than 100m RCCD have Long Tan (216m), Jiang Ya (131m), Baise (126m), make a pilgrimage to a temple on a famous mountain greatly (121m), Cotton Gossypii beach (111m), wherein grinding coagulation soil amount all exceedes more than the 60% of whole dam concrete amount.

The grinding concrete dam technology of China, is to send out on the basis of last century the eighties absorb advanced foreign technology Exhibition is got up, but has also founded oneself unique experience, but RCCD yet suffers from many needs further investigations Aspect, such as with regard to RCCD change of temperature field rule and Varied Temperature Field, the impact problem to dam structure condition is increasingly subject to Pay attention to, RCCD aspect and body joint portion mechanism of action problem are more prominent, relevant RCCD temperature field And its on dam action effect impact research be still the important problem studied in the industry.

Nineteen sixty-eight, department of civil engineering of California, USA university professor wilson have developed one first for CE, US Army Two-dimensional temperature field finite element simulation program dot-dice of individual large volume concrete structural stage construction, and it is successfully applied to De Wo The Temperature calculating on Shack dam (dworshak), engineer tatro and schrader of CE, US Army in 1985 enters One step have modified this program, uses it for U.S. First RCCD (rccd) Liu Xi dam (willowcreak) Temperature field analysis, Japanese tobishima company in 1992 delivered according to field data asked based on finite element calorifics and The inverse analysis method of boundary property parameter, for current RCCD structure behaviour, it forwardly needs to research and develop one Plant the technology that can truly detect RCCD temperature field, although various technology of numerical simulation is advanced, be emulation after all Simulation, all there is huge problem in its verity, the property of can refer to.

Content of the invention

Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of RCCD structure Condition monitoring system and monitoring method, break through and monitor thinking in traditional sense, initiate and propose based on temperature sensing optical fiber technology Structure behaviour monitoring device and curved tune device, farthest achieve under truth monitoring RCCD structure Military service condition, based on the distributed monitoring of temperature sensing optical fiber, substantially increase the ability of monitoring, admirably meet reality The demand of RCCD structure behaviour diagnosis, probes into current RCCD structure behaviour health monitoring and provides weight The guarantee wanted, has outstanding advantage reducing the aspects such as monitoring cost, raising monitoring accuracy and lifting practical application ability.

For solving above-mentioned technical problem, a kind of RCCD structure behaviour monitoring system of the present invention, including structure Condition monitoring device and curved tune device, structure behaviour monitoring device is connected with curved tune device by temperature sensing optical fiber；

Structure behaviour monitoring device includes: holds and carries chuck, platform of cutting sth. askew, first arc platform, Article 2 arc platform, the first basal edge platform With the second basal edge platform, hold load chuck and be connected with first arc platform and Article 2 arc platform respectively by platform of cutting sth. askew, first arc platform The external first load end chamber in tip, the external second load end chamber in the tip of Article 2 arc platform, temperature sensing optical fiber carries chuck one by holding Side is drawn, and sequentially passes through first arc platform, the first load end chamber, the first basal edge platform, curved tune device, the second basal edge platform, the second load end Behind chamber and Article 2 arc platform, the calm opposite side carrying chuck is drawn；

Curved tune device includes: main core, sector, principal curvature arc and the first circular hole screw for fixation and the second circle Hole screw, at the tapered end of sector, at the arc-shaped side of sector, curved tune device passes through principal curvature arc main core Sector is by temperature sensing optical fiber curve transition to principal curvature arc；

First load end chamber upper shed has draws hole outside first, and the second load end chamber upper shed has draws hole, outside first outside second Draw and draw hole outside hole and second respectively to the first load end chamber and the second load end intracavity injection gel,

The hole that spins outside first is offered on the first basal edge platform, the second basal edge platform offers the hole that spins outside second, first The spin outward hole that spins outside hole and second is laid in the two ends of temperature sensing optical fiber respectively, and spins outside spin outside first hole and second In the hole places outdoor temperature meter respectively；

The side of the corresponding first arc platform of structure behaviour monitoring device is provided with first turn of fine axle and first turn of fine post, and corresponding the Article two, the opposite side of arc platform is provided with second turn of fine axle and second turn of fine post, and first turn of fine axle and second turn of fine axle extend through and pass through First turn of fine post and second turn of fine post, by rotating first turn of fine axle and second turn of fine first turn of fine post of axial adjustment and second turn of fibre The distance between post, after temperature sensing optical fiber completes to lay, locks first turn of fine axle and second turn of fine axle.

The incline structure that platform of cutting sth. askew is is 60 ° with horizontal sextant angle, first arc platform and Article 2 arc platform are π/3 for radian Arcuate structure body.

In curved tune device, sector can carry out 360 ° of rotation around main core, is radian on the top of sector For the principal curvature arc of π/3, temperature sensing optical fiber is adjusted by the transition that principal curvature arc is curved place, after adjustment finishes, By the first circular hole screw and the second circular hole screw, curved tune device is fixed and arranges.

A kind of monitoring method of RCCD structure behaviour monitoring system, comprises the following steps:

The first step, structure behaviour monitoring device and curved tune device is attached by temperature sensing optical fiber, first passes through Curved tune device the place to be bent of temperature sensing optical fiber is carried out effective curve transition, after the two ends of temperature sensing optical fiber are stretched, Wherein one end causes the first basal edge platform successively, first carries end chamber and first arc platform, the other end cause successively the second basal edge platform, the Two carry end chambeies and Article 2 arc platform, draw hole and respectively gel injection first are carried end chamber and the by drawing outside first outside hole and second Two carry in the chamber of end, pass through first turn of fine axle, second turn of fine axle and first turn of fine post, second turn of fine post afterwards temperature sensing optical fiber is solid Carry in chuck due to holding, and on the hole that spins outside spin outside first hole and second, outdoor temperature meter is installed, after laying to be done, Start to obtain the temperature data on temperature sensing optical fiber；

Second step, the temperature value at each position of the dam body monitored by temperature sensing optical fiber defines temperature field, for three The RCCD of dimension, according to dam initial time t (x, y, z, t) |_T=0The temperature field that the junction temperature determining is formed is to grind Pressure concrete dam initial temperature field, is designated asBy any instant unit junction temperature φ_iThe temperature field being formed isX, y, z is In dam the x of node to, y to, z to coordinate figure, t is the time；

3rd step, is only considering line strain, when not considering shear strain, the strain stress that produced by thermal deformation_tFor:

In formula, α_lFor y to temperature linear expansion coefficient；α_vFor z direction temperature linear expansion coefficient；

4th step, RCCD is subject to other external loads and effect of contraction, grinding coagulation in this temperature changing process There is initial strain ε in earth dam, in this case, using RCCD finite element method, this RCCD is carried out Relation between temperature effect stress σ and strain stress is:

$\mathrm{\σ}=\[\stackrel{\&overbar;}{d_n}\](\mathrm{\ϵ}-{\mathrm{\ϵ}}_t),$

Wherein,For RCCD Equivalent Elasticity matrix, ε_tThe strain producing for thermal deformation；Its incremental form Physical equation is:

$\left\{{\mathrm{\δ\σ}}_n\right\}=\[\stackrel{\&overbar;}{d_n}\]\[\left\{{\mathrm{\δ\ϵ}}_n\right\}-\left\{{\mathrm{\δ\ϵ}}_{tn}\right\}\],$

In formula: { δ ε_tnIt is δ t_nThe strain increment being produced due to temperature change in period, { δ ε_nStrain increasing for node Amount, { δ σ_nIt is node stress increment；

5th step, by the operation of above step it is achieved that the purpose of monitoring node ess-strain situation, is finally completed and sentences The structure behaviour of disconnected RCCD position.

Beneficial effect: the present invention breaks through the monitoring of RCCD structure behaviour and analysis method in traditional sense, initiates Propose the structure behaviour monitoring device based on temperature sensing optical fiber technology and curved tune device, construct the high-precision biography of multimode Sense optical fiber monitoring device, based on grinding coagulation soil linear expansion coefficient, the thermal parameters equivalent analysis such as specific heat, be calculated roll mixed Effect under temperature change effect for the solidifying earth dam, farthest achieves monitoring RCCD structure under truth Military service condition.

Brief description

Fig. 1 is the monitoring method prison flow chart of the RCCD structure behaviour monitoring system of the present invention；

The structural representation of structure behaviour monitoring device in Fig. 2 present invention；

Fig. 3 is the side view of Fig. 2；

Fig. 4 is the curved structural representation adjusting device in the present invention；

Fig. 5 is rccd6# monolith ELEMENT MESH GRAPH in the present invention；

Fig. 6 is the structural representation of cell cube m of the RCCD body of the present invention and thin layer composition；

Fig. 7 is the location drawing of a6-c-04 measuring point and a6-c-05 measuring point；

Fig. 8 is a6-c-04 measuring point perpendicular to dam foundation face direct stress FEM calculation and measured value graph comparison diagram；

Fig. 9 is a6-c-05 measuring point perpendicular to dam foundation face direct stress FEM calculation and measured value graph comparison diagram；

Figure 10 is micro unit abcd shear strain schematic diagram.

Wherein: 00- holds load chuck；01- cuts sth. askew platform；First arc platform of 02-；Hole is drawn outside 03- first；04- first carries end chamber； 05- temperature sensing optical fiber；The fine post of first turn of 06-；The fine axle of first turn of 07-；The fine axle of second turn of 08-；The fine post of second turn of 09-；10- Hole is drawn outside two；11- second carries end chamber；12- the first basal edge platform；Spin outside 13- first hole；14- the second basal edge platform；Outside 15- second Spin hole；The main core of 16-；17- sector；18- the first circular hole screw；19- principal curvature arc；20- the second circular hole screw；21- Body；22- aspect；26- Article 2 arc platform.

Specific embodiment

In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only with Illustration illustrates the basic structure of the present invention, and therefore it only shows the composition relevant with the present invention.

A kind of RCCD structure behaviour monitoring system, including structure behaviour monitoring device and curved tune device, structure Condition monitoring device is connected with curved tune device by temperature sensing optical fiber；

Structure behaviour monitoring device includes: holds and carries chuck, platform of cutting sth. askew, first arc platform, Article 2 arc platform, the first basal edge platform With the second basal edge platform, hold load chuck and be connected with first arc platform and Article 2 arc platform respectively by platform of cutting sth. askew, first arc platform The external first load end chamber in tip, the external second load end chamber in the tip of Article 2 arc platform, temperature sensing optical fiber carries chuck one by holding Side is drawn, and sequentially passes through first arc platform, the first load end chamber, the first basal edge platform, curved tune device, the second basal edge platform, the second load end Behind chamber and Article 2 arc platform, the calm opposite side carrying chuck is drawn；

Curved tune device includes: main core, sector, principal curvature arc and the first circular hole screw for fixation and the second circle Hole screw, at the tapered end of sector, at the arc-shaped side of sector, curved tune device passes through principal curvature arc main core Sector is by temperature sensing optical fiber curve transition to principal curvature arc；

First load end chamber upper shed has draws hole outside first, and the second load end chamber upper shed has draws hole, outside first outside second Draw and draw hole outside hole and second respectively to the first load end chamber and the second load end intracavity injection gel,

The hole that spins outside first is offered on the first basal edge platform, the second basal edge platform offers the hole that spins outside second, first The spin outward hole that spins outside hole and second is laid in the two ends of temperature sensing optical fiber respectively, and spins outside spin outside first hole and second In the hole places outdoor temperature meter respectively；

The side of the corresponding first arc platform of structure behaviour monitoring device is provided with first turn of fine axle and first turn of fine post, and corresponding the Article two, the opposite side of arc platform is provided with second turn of fine axle and second turn of fine post, and first turn of fine axle and second turn of fine axle extend through and pass through First turn of fine post and second turn of fine post, by rotating first turn of fine axle and second turn of fine first turn of fine post of axial adjustment and second turn of fibre The distance between post, after temperature sensing optical fiber completes to lay, locks first turn of fine axle and second turn of fine axle.

The incline structure that platform of cutting sth. askew is is 60 ° with horizontal sextant angle, first arc platform and Article 2 arc platform are π/3 for radian Arcuate structure body.The setting of this kind of combinative structure form be mainly to increase cooperative transformation characteristic with structure to be measured it is ensured that Temperature sensing optical fiber is effectively realized laying and monitoring.

In curved tune device, sector can carry out 360 ° of rotation around main core, is radian on the top of sector For the principal curvature arc of π/3, temperature sensing optical fiber is adjusted by the transition that principal curvature arc is curved place, after adjustment finishes, By the first circular hole screw and the second circular hole screw, curved tune device is fixed and arranges.

A kind of monitoring method of RCCD structure behaviour monitoring system, comprises the following steps:

The first step, structure behaviour monitoring device and curved tune device is attached by temperature sensing optical fiber, first passes through Curved tune device the place to be bent of temperature sensing optical fiber is carried out effective curve transition, after the two ends of temperature sensing optical fiber are stretched, Wherein one end causes the first basal edge platform successively, first carries end chamber and first arc platform, the other end cause successively the second basal edge platform, the Two carry end chambeies and Article 2 arc platform, draw hole and respectively gel injection first are carried end chamber and the by drawing outside first outside hole and second Two carry in the chamber of end, pass through first turn of fine axle, second turn of fine axle and first turn of fine post, second turn of fine post afterwards temperature sensing optical fiber is solid Carry in chuck due to holding, and on the hole that spins outside spin outside first hole and second, outdoor temperature meter is installed, after laying to be done, Start to obtain the temperature data on temperature sensing optical fiber；

Second step, the temperature value at each position of the dam body monitored by temperature sensing optical fiber defines temperature field, for three The RCCD of dimension, according to dam initial time t (x, y, z, t) |_T=0The temperature field that the junction temperature determining is formed is to grind Pressure concrete dam initial temperature field, is designated asBy any instant unit junction temperature φ_iThe temperature field being formed is

3rd step, is only considering line strain, when not considering shear strain, the strain stress that produced by thermal deformation_tFor:

In formula, α_lFor y to temperature linear expansion coefficient；α_vFor z direction temperature linear expansion coefficient；

4th step, RCCD is subject to other external loads and effect of contraction, grinding coagulation in this temperature changing process There is initial strain ε in earth dam, in this case, using RCCD finite element method, this RCCD is carried out Relation between temperature effect stress σ and strain stress is:

$\mathrm{\σ}=\[\stackrel{\&overbar;}{d_n}\](\mathrm{\ϵ}-{\mathrm{\ϵ}}_t),$

Wherein,For RCCD Equivalent Elasticity matrix, ε_tThe strain producing for thermal deformation；Its incremental form Physical equation is:

$\left\{{\mathrm{\δ\σ}}_n\right\}=\[\stackrel{\&overbar;}{d_n}\]\[\left\{{\mathrm{\δ\ϵ}}_n\right\}-\left\{{\mathrm{\δ\ϵ}}_{tn}\right\}\],$

In formula: { δ ε_tnIt is δ t_nThe strain increment being produced due to temperature change in period, { δ ε_nStrain increasing for node Amount, { δ σ_nIt is node stress increment；

5th step, by the operation of above step it is achieved that the purpose of monitoring node ess-strain situation, is finally completed and sentences The structure behaviour of disconnected RCCD position.

Optical fiber sensing technology is a kind of new sensing technology that recent decades are grown up, and it is with light wave for sensing letter Number, when sensor fibre is when being acted on by environmental factorss such as extraneous stress, temperature, in optical fiber, the light wave of transmission is easy to be subject to this Modulation that is outer on the scene a bit or measuring, and then the change of light wave characterization parameter, such as light intensity, phase place, frequency, polarization state can occur Deng change, the information of extraneous tested parameter can be obtained by monitoring the change of these information.

Based on above-mentioned background, patent of the present invention breaks through the monitoring of RCCD structure behaviour and analysis side in traditional sense Method, pioneering structure behaviour monitoring device and the curved tune device proposing based on temperature sensing optical fiber technology, construct multimode high The sensor fibre monitoring device of precision, farthest achieves the military service monitoring RCCD structure under truth Condition.

Embodiment 1

Certain RCCD is located on the domestic Jinsha jiang River middle reach in Lijiang County In Yunnan Province area, maximum height of dam 160m, The long 640m of dam crest；Following current to greatest length 156m, this RCCD 6# typical section height of dam 144m, the typical section construction time Structure behaviour to the effect of the factors such as runtime thermal load, hydraulic pressure load is studied, in research process, with dam foundation face pressure Pressure detection point a6-c-04 and a6-c-05 is as typical position to be analyzed research, this RCCD 6# monolith computational fields It is divided into 21290 units, 26690 nodes altogether, finite element is as shown in Figure 5.RCCD is carried out with the construction time to fortune Departure date simulation calculation, during calculating, the computational methods of the thermal load action effect according to the present invention, obtain the strain of each period Increment and stress increment.

Below in conjunction with the accompanying drawings the present invention is further described.

As shown in Figures 1 to 10, a kind of RCCD structure behaviour monitoring system of the present invention, including structure behaviour Monitoring device and curved tune device, structure behaviour monitoring device passes through gjjv model tight sleeving temperature sensor fibre 05 and curved tune device phase Connect, structure behaviour monitoring device mainly includes long 50cm, wide 80cm, the appearance load chuck 00 of high 30cm, long 20cm, width 80cm, the platform 01 of cutting sth. askew of high 30cm, radian are π/3, first arc platform 02 of high 40cm, radian are π/3, the Article 2 of high 40cm Arc platform 26, long 50cm, wide 80cm, the appearance of high 30cm carry chuck 00 and pass through long 20cm, wide 80cm, cut sth. askew platform 01 and the arc of high 30cm Spend first arc platform 02 for π/3, high 40cm to be connected, the incline structure that platform of cutting sth. askew is is 60 ° with horizontal sextant angle, radian be π/ 3rd, first arc platform 02 of high 40cm and radian be π/3, the Article 2 arc platform 26 of high 40cm be the arcuate structure for π/3 for the radian Body, the setting of this kind of combinative structure form is mainly to increase cooperative transformation characteristic with structure to be measured it is ensured that temperature sensing light Fine effectively realization is laid and monitoring, and radian is π/3, the external a diameter of 0.5cm in tip of first arc platform 02 of high 40cm, length The first load end chamber 04 for 2cm, gjjv model tight sleeving temperature sensor fibre 05 is the first of 2cm by a diameter of 0.5cm, length After carrying end chamber 04, the first basal edge platform 12 being 5cm with length, width and height is connected, and is the first basal edge platform of 5cm by length, width and height The gjjv model tight sleeving temperature sensor fibre 05 that 12 pass is connected with curved tune device, gjjv model tight sleeving temperature sensor fibre 05 Through curved adjust device after be 5cm with length, width and height the second basal edge platform 14 be connected, after to be connected to radian be π/3, high 40cm On Article 2 arc platform 26.

In the present invention, structure behaviour monitoring device left and right sides include diameter 0.5cm, first turn of length 5cm fine axle 07, First turn of fine post 06, diameter 5cm, thickness of diameter 0.5cm, second turn of fine axle 08 of length 5cm and diameter 5cm, thickness 2cm Second turn of 2cm fine post 09, diameter 0.5cm, first turn of fine axle 07 of length 5cm and diameter 0.5cm, second turn of length 5cm Fine axle 08 extends through second turn of fine post 09 of diameter 5cm, first turn of fine post 06 of thickness 2cm and diameter 5cm, thickness 2cm, leads to Cross and rotate diameter 0.5cm, first turn of fibre axle 07 of length 5cm and diameter 0.5cm, second turn of fine axle 08 of length 5cm adjusts directly Footpath 5cm, first turn of fine post 06 of thickness 2cm and the distance between diameter 5cm, second turn of fine post 09 of thickness 2cm, treat gjjv type After number tight sleeving temperature sensor fibre 05 completes to lay, locking diameter 0.5cm, first turn of fine axle 07 of length 5cm and diameter 0.5cm, second turn of fine axle 08 of length 5cm.

In the present invention, diameter 0.5cm, the first load end chamber 04 upper shed of length 2cm have diameter 0.1cm, the of height 1cm Draw hole 03 outside one, diameter 0.5cm, the second load end chamber 11 upper shed of length 2cm have diameter 0.1cm, height 1cm second outside draw Hole 10, by diameter 0.1cm, height 1cm first outside draw hole 03 and diameter 0.1cm, height 1cm second outside draw hole 10 to straight Footpath 0.5cm, the first load end chamber 04 and second of length 2cm carry end intracavity injection plural gel body, are the of 5cm in length, width and height Spin outside offer diameter 0.2cm on one basal edge platform 12 first hole 13, opens on the second basal edge platform 14 that length, width and height are 5cm Spin hole 15 outside be provided with diameter 0.2cm second, diameter 0.2cm first outside spin the 15 holes cloth respectively that spin outside hole 13 and second It is located at the two ends of gjjv model tight sleeving temperature sensor fibre 05, and spin outside the hole 13 and second that spins outside the first of diameter 0.2cm 15 are mainly used to place outdoor temperature meter.

In the present invention, the curved main core 16 adjusting device mainly to include diameter 1cm, height 30cm, height 30cm, radian π/ 3 sector 17, diameter 1cm, the first circular hole screw 18 of height 5cm, the principal curvature arc 19 of radian π/3, diameter 1cm, height Tight for gjjv model sleeving temperature sensor fibre 05 is bent by the second circular hole screw 20 of degree 5cm by the sector 17 of radian π/3 It is transitioned at principal curvature arc, and the second circle by diameter 1cm, the first circular hole screw 18 of height 5cm and footpath 1cm, height 5cm Curved tune device is effectively fixed and is arranged by hole screw 20, and the sector 17 of radian π/3 can be around diameter 1cm, highly The main core 16 of 30cm carries out 360 ° of rotation, is the principal curvature arc that radian is π/3 on the top of the sector 17 of radian π/3 19, gjjv models tight sleeving temperature sensor fibre 05 is adjusted by the transition that the principal curvature arc 19 of radian π/3 is curved place, is adjusting Whole finish after, by the second circular hole screw of diameter 1cm, the first circular hole screw 18 of height 5cm and diameter 1cm, height 5cm Curved tune device is effectively fixed and is arranged by 20.

A kind of monitoring method of RCCD structure behaviour monitoring system, comprises the following steps:

(1) laying of device and adjustment；

Structure behaviour monitoring device and curved tune device are attached by gjjv model tight sleeving temperature sensor fibre 05, first First pass through curved tune device and place to be bent carried out effective curve transition, after by the two ends of tight for gjjv model sleeving temperature sensor fibre 05 Stretch, wherein one end causes the first basal edge platform, the first load end chamber and first arc platform successively, the other end causes the second basal edge successively Platform, second carry end chamber and Article 2 arc platform, draw hole 10 outside hole 03 and second by gel injection the first load end by drawing outside first Chamber 04 and second carries in end chamber 11, passes through first turn of fine 07, second turn of fine axle 08 of axle and first turn of fine 06, second turn of fine post of post afterwards Temperature sensing optical fiber 05 is fixed on appearance by 09 to be carried in chuck 00, and installs on the hole 15 that spins outside the hole 13 and second that spins outside first Outdoor temperature meter, after laying to be done, starts to obtain the temperature data on temperature sensing optical fiber 05；

(2) build temperature field；

The temperature value at each position of dam body monitored by temperature sensing optical fiber in previous step 05 defines temperature field, for Three-dimensional RCCD, according to dam initial time t (x, y, z, t) |_t=₀The temperature field that the junction temperature determining is formed is RCCD initial temperature field, is designated asAnd by any instant unit junction temperature φ_iThe temperature field being formed is

(3) only consider line strain, do not consider during shear strain, to calculate thermal deformation strain；

Based on the content of (2nd) step, can obtain:

Wherein, n_eFor unit number, n_iFor shape function,For any instant n_eThe temperature field that individual unit is formed；

Dam body is by initial temperature fieldIt is changed to temperature fieldThe strain stress being produced due to thermal deformation_tFor:

Wherein, α is temperature linear expansion coefficient,

In this engineering, RCCD is subject to other external loads and effect of contraction, rolls mixed in this temperature changing process There is initial strain ε in solidifying earth dam, in this case, the relation between displacement δ and strain stress is: (ε-ε_t)=b δ；B=[b in formula₁b₂ b₃… b_m]^t:

$b_i={\left[\begin{array}{cccccc}\frac{\∂n_i}{\∂x}& 0& 0& \frac{\∂n_i}{\∂y}& 0& \frac{\∂n_i}{\∂z}\\ 0& \frac{\∂n_i}{\∂y}& 0& \frac{\∂n_i}{\∂x}& \frac{\∂n_i}{\∂z}& 0\\ 0& 0& \frac{\∂n_i}{\∂z}& 0& \frac{\∂n_i}{\∂y}& \frac{\∂n_i}{\∂x}\end{array}\right]}^t,(i=1,2,...,m);$

Element stiffness matrix k^eFor

In formula:For RCCD Equivalent Elasticity matrix, b is coefficient matrix, b^tTransposed matrix for coefficient matrix；

For treating integral domain；

3rd step, is only considering line strain, when not considering shear strain, and by initial temperature fieldIt is changed to temperature fieldBy The strain stress producing in thermal deformation_t；

In formula, α is temperature linear expansion coefficient；

Choose cell cube m of the RCCD being made up of body 21 and aspect 22；Cell cube m horizontal equivalent temperature line The coefficient of expansion is α_l, vertical equivalent temperature linear expansion coefficient is α_v, do not constrained by other, had under acting on by temperature difference δ t； Line strain along aspect 22 direction is:

${\mathrm{\ϵ}}_x^t={\mathrm{\ϵ}}_y^t={\mathrm{\α}}_l\mathrm{\δ}t,$

In formula,For the line strain in x direction for cell cube m,For the line strain in y direction for cell cube m；

Line strain perpendicular to aspect 22 direction is:

${\mathrm{\ϵ}}_z^t={\mathrm{\α}}_v\mathrm{\δ}t;$

In formula,For the line strain in z direction for cell cube m；Choose the micro unit abcd of ds × ds, described micro unit Abcd is in the y-z plane perpendicular to RCCD aspect 22 direction；Then each point coordinates of micro unit abcd is a:(0,0), B:(ds, 0), c:(ds, ds) and, d:(0, ds)；Under alternating temperature δ t effect, this micro unit abcd is deformed into ab'c'd', and ab cuts should It is changed into α, ad shear strain is β, y is α to temperature linear expansion coefficient_l, z direction temperature linear expansion coefficient is α_v, in the effect of temperature delta t Under, micro unit is moved to ab'c'd', ignores δ t α_lDs and δ t α_vThe impact of the second order infinitesimal length of ds, then have Point b'c'd' coordinate has:

b':([ds+δt·α_l·ds],δt·α_vDs), c':([ds+ δ t α_l·ds],[ds+δt·α_v· Ds]),

Then have: d':(δ t α_l·ds,[ds+δt·α_v·ds])；

${\mathrm{\γ}}_{yz}^t=\mathrm{\α}+\mathrm{\β}=\frac{\mathrm{\δ}t\·{\mathrm{\α}}_v\·ds}{ds+\mathrm{\δ}t\·{\mathrm{\α}}_l\·ds}-\frac{\mathrm{\δ}t\·{\mathrm{\α}}_l\·ds}{ds+\mathrm{\δ}t\·{\mathrm{\α}}_v\·ds};$

In formula,For micro unit abcd shear strain in the y and z directions；

There is δ t α in this Practical Project_vWith δ t α_lAll much smaller than 1, therefore desirable:

${\mathrm{\γ}}_{yz}^t=\mathrm{\δ}t\·{\mathrm{\α}}_v-\mathrm{\δ}t\·{\mathrm{\α}}_l=\mathrm{\δ}t({\mathrm{\α}}_v-{\mathrm{\α}}_l);$

Equally have:

${\mathrm{\γ}}_{zx}^t=\mathrm{\δ}t({\mathrm{\α}}_l-{\mathrm{\α}}_v),{\mathrm{\γ}}_{xy}^t=\mathrm{\δ}t({\mathrm{\α}}_l-{\mathrm{\α}}_l)=0;$

In formula,For shear strain on z and x direction for the micro unit abcd,For micro unit abcd in the x and y direction Shear strain；Therefore, in no other constraints, only under temperature difference δ t effect, cell cube m temperature strain Incremental Equation is:

$\begin{array}{c}{\mathrm{\δ\ϵ}}_n^t=\{{\mathrm{\α}}_l\mathrm{\δ}t,{\mathrm{\α}}_l\mathrm{\δ}t,{\mathrm{\α}}_v\mathrm{\δ}t,0,({\mathrm{\α}}_v-{\mathrm{\α}}_l)\mathrm{\δ}t,({\mathrm{\α}}_l-{\mathrm{\α}}_v)\mathrm{\δ}t\}\\ =\mathrm{\δ}t\{{\mathrm{\α}}_l,{\mathrm{\α}}_l,{\mathrm{\α}}_v,0({\mathrm{\α}}_v-{\mathrm{\α}}_l),({\mathrm{\α}}_l-{\mathrm{\α}}_v)\}\end{array};$

In formula: δ t is temperature difference；

(4) monitoring node ess-strain situation, judge the structure behaviour of RCCD position；

RCCD is subject to other external loads and effect of contraction, and in this temperature changing process, RCCD exists Initial strain ε, in this case, carries out temperature action using RCCD finite element method to this RCCD Relation between effect stress σ and strain stress is:

$\mathrm{\σ}=\[\stackrel{\&overbar;}{d_n}\](\mathrm{\ϵ}-{\mathrm{\ϵ}}_t),$

Wherein,For RCCD Equivalent Elasticity matrix, ε_tThe strain producing for thermal deformation；Its incremental form Physical equation is:

$\left\{{\mathrm{\δ\σ}}_n\right\}=\[\stackrel{\&overbar;}{d_n}\]\[\left\{{\mathrm{\δ\ϵ}}_n\right\}-\left\{{\mathrm{\δ\ϵ}}_{tn}\right\}\],$

In formula: { δ ε_tnIt is δ t_nThe strain increment being produced due to temperature change in period, { δ ε_nStrain increasing for node Amount, { δ σ_nIt is node stress increment,

By the operation of above step, construct typical position perpendicular to dam foundation face pressure stress path line and measured value mistake Journey line contrasts, and as shown in Fig. 8～Fig. 9, can be seen that the construction time with the increase of dam body elevation by Fig. 8～Fig. 9, by from recast Increased with, dam foundation face pressure stress, after dam water-retention, under the effect of upstream reservoir level, dam foundation face upstream lateral stress reduces, near under Trip lateral stress increases, and overall finite element simulation obtains dam foundation face pressure stress path line and the measuring point actual measurement change rule of typical position Rule is consistent, shows that RCCD numerical simulation computational methods presented herein can preferably reflect RCCD alternating temperature Action effect and the Changing Pattern of structure behaviour, have been finally completed the work of the structure behaviour judging RCCD position Make.

The above be only the preferred embodiment of the present invention it should be pointed out that: for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (4)

1. a kind of RCCD structure behaviour monitoring system it is characterised in that: include structure behaviour monitoring device and curved tune Device, structure behaviour monitoring device is connected with curved tune device by temperature sensing optical fiber；

Structure behaviour monitoring device includes: holds and carries chuck, platform of cutting sth. askew, first article of arc platform, Article 2 arc platform, the first basal edge platform and the Two basal edge platforms, are held load chuck and are connected with first arc platform and Article 2 arc platform respectively by platform of cutting sth. askew, the point of first arc platform Hold external first load end chamber, the external second load end chamber in tip of Article 2 arc platform, temperature sensing optical fiber is drawn by holding load chuck side Go out, sequentially pass through first arc platform, first carry end chamber, the first basal edge platform, curved tune device, the second basal edge platform, second carry end chamber and After Article 2 arc platform, the calm opposite side carrying chuck is drawn；

Curved tune device includes: main core, sector, principal curvature arc and the first circular hole screw for fixation and the second circular hole spiral shell Nail, at the tapered end of sector, at the arc-shaped side of sector, curved tune device passes through sector to principal curvature arc to main core Blade is by temperature sensing optical fiber curve transition to principal curvature arc；

First load end chamber upper shed has draws hole outside first, and the second load end chamber upper shed has draws hole outside second, draws hole outward by first Draw outward hole with second and carry end chamber and the second load end intracavity injection gel to first respectively,

The hole that spins outside first is offered on the first basal edge platform, the second basal edge platform offers the hole that spins outside second, the first outward turning Connect the two ends that the hole that spins outside hole and second is laid in temperature sensing optical fiber respectively, and the in the hole that spins outside spin outside first hole and second Place outdoor temperature meter respectively；

The side of the corresponding first arc platform of structure behaviour monitoring device is provided with first turn of fine axle and first turn of fine post, corresponding Article 2 The opposite side of arc platform is provided with second turn of fine axle and second turn of fine post, and first turn of fine axle and second turn of fine axle extend through by first Turn fine post and second turn of fine post, by rotate first turn of fine axle and second turn of fine first turn of fine post of axial adjustment and second turn of fine post it Between distance, after temperature sensing optical fiber completes to lay, the fine axle of first turn of locking and second turn of fine axle.

2. RCCD structure behaviour monitoring system according to claim 1 it is characterised in that: platform of cutting sth. askew is and water Flat angle is 60 ° of incline structure, and first arc platform and Article 2 arc platform are the arcuate structure body of π/3 for radian.

3. a kind of RCCD structure behaviour monitoring system according to claim 1 it is characterised in that: curved tune device Middle sector can carry out 360 ° of rotation around main core, is the principal curvature arc that radian is π/3 on the top of sector, Temperature sensing optical fiber is adjusted by the transition that principal curvature arc is curved place, after adjustment finishes, by the first circular hole screw With the second circular hole screw, curved tune device is fixed and arranges.

4. a kind of a kind of as claimed in claim 1 monitoring method of RCCD structure behaviour monitoring system, its feature It is, comprise the following steps:

The first step, structure behaviour monitoring device and curved tune device is attached by temperature sensing optical fiber, first passes through curved tune The place to be bent of temperature sensing optical fiber is carried out effective curve transition by device, after the two ends of temperature sensing optical fiber are stretched, wherein One end causes the first basal edge platform, the first load end chamber and first arc platform successively, and the other end causes the second basal edge platform, the second load successively End chamber and Article 2 arc platform, draw outward by first and draw hole outside hole and second respectively by gel injection first load end chamber and the second load In the chamber of end, by first turn of fine axle, second turn of fine axle and first turn of fine post, second turn of fine post, temperature sensing optical fiber is fixed on afterwards Hold and carry in chuck, and on the hole that spins outside spin outside first hole and second, outdoor temperature meter is installed, after laying to be done, start Obtain the temperature data on temperature sensing optical fiber；

Second step, the temperature value at each position of the dam body monitored by temperature sensing optical fiber defines temperature field, for three-dimensional RCCD, according to dam initial time t (x, y, z, t) |_T=0The temperature field that the junction temperature determining is formed is mixed for rolling Solidifying earth dam initial temperature field, is designated asBy any instant unit junction temperature φ_iThe temperature field being formed isX, y, z is dam The x of middle node to, y to, z to coordinate figure, t is the time；

3rd step, is only considering line strain, when not considering shear strain, the strain stress that produced by thermal deformation_tFor:

In formula, α_lFor y to temperature linear expansion coefficient；α_vFor z direction temperature linear expansion coefficient；

4th step, RCCD is subject to other external loads and effect of contraction, RCCD in this temperature changing process There is initial strain ε, in this case, using RCCD finite element method, trip temperature is entered to this RCCD Relation between action effect stress σ and strain stress is:

Wherein,For RCCD Equivalent Elasticity matrix, ε_tThe strain producing for thermal deformation；The physics of its incremental form Equation is:

$\left\{{\mathrm{\δ\σ}}_n\right\}=\[\stackrel{\&overbar;}{d_n}\]\[\left\{{\mathrm{\δ\ϵ}}_n\right\}-\left\{{\mathrm{\δ\ϵ}}_{tn}\right\}\],$

In formula: { δ ε_tnIt is δ t_nThe strain increment being produced due to temperature change in period, { δ ε_nIt is node strain increment, { δ σ_nIt is node stress increment；

5th step, by the operation of above step it is achieved that the purpose of monitoring node ess-strain situation, is finally completed judgement and grinds The structure behaviour of pressure concrete dam position.