CN110197014B - Large-size rectangular jacking pipe jacking force estimation method based on displacement control - Google Patents
Large-size rectangular jacking pipe jacking force estimation method based on displacement control Download PDFInfo
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- CN110197014B CN110197014B CN201910398883.9A CN201910398883A CN110197014B CN 110197014 B CN110197014 B CN 110197014B CN 201910398883 A CN201910398883 A CN 201910398883A CN 110197014 B CN110197014 B CN 110197014B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a displacement control-based large-size rectangular jacking force estimation method for jacking pipes, which comprises the following steps of: step 1, establishing a numerical analysis model of a soil layer-rectangular jacking pipe by using numerical analysis software Abaqus; step 2, applying a given jacking distance and grouting pressure scheme to the rectangular jacking pipe according to the established numerical analysis model; step 3, obtaining different jacking forces according to different jacking distances and grouting pressure schemes, and drawing fitting curves of the jacking forces changing along with the jacking distances under different grouting pressure schemes; and step 4, repeating the step 2 and the step 3 to obtain different fitting curves, comparing the fitting curves with an empirical formula and measured data to obtain a best fitting curve and a jacking force fitting function, and estimating jacking force, wherein the fitting function can be used as a jacking force calculation general formula of the jacking pipe under the same design parameters and construction conditions. The method can easily estimate the jacking force instead of using a time-consuming trial-and-error method to estimate the jacking force, and can be well adapted to the contact conditions of various pipelines and soil bodies.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a displacement control-based large-size rectangular jacking force estimation method for jacking pipes.
Background
The jacking construction is to overcome the friction force between the pipeline and the surrounding soil body by means of the jacking force generated by jacking equipment in the working pit and jack the pipeline into the soil according to the designed gradient. After one pipe section is completely jacked into the soil layer, a second pipe section is further jacked in, and the pipeline is buried between two pits by analogy. In the pipe jacking construction process, jacking force is the most critical parameter in the whole pipe jacking engineering, and along with continuous excavation of a pipe jacking machine, all the pipe jacking needs to be jacked into the soil by means of the jacking force, and the jacking force is transmitted between pipe joints and finally reaches the pipe jacking machine, so that the working face of the pipe jacking machine is excavated in an entering balance mode.
The estimation of the jacking force is an important problem in the construction and design of the jacking pipe, numerical analysis is often used for simulating the construction process, and through numerical simulation, the contact mechanical behavior of the soil body around the jacking pipe and the outer wall of the jacking pipe can be rapidly determined, so that the estimation of the jacking force is facilitated. In numerical simulation of engineering mechanical behaviors, a stress control method is generally adopted, and because of uncertainty of an empirical calculation formula and a theoretical calculation formula, a jacking force estimation result has uncertainty, and the fact that the jacking force is too large can lead to damage of a pipe section structure and the fact that the jacking force is too small can lead to jacking failure.
Disclosure of Invention
The invention aims to provide a displacement control-based large-size rectangular jacking force estimation method for jacking pipes, which aims to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a displacement control-based large-size rectangular jacking force estimation method comprises the following steps:
step 1, establishing a numerical analysis model of a soil layer-rectangular jacking pipe by using numerical analysis software Abaqus;
step 2, applying a given jacking distance and grouting pressure scheme to the rectangular jacking pipe according to the established numerical analysis model;
step 3, obtaining different jacking forces according to different jacking distances and grouting pressure schemes, and drawing a fitting curve of the jacking forces changing along with the jacking distances under different grouting pressure schemes;
and step 4, repeating the step 2 and the step 3 to obtain different fitting curves, comparing the fitting curves with an empirical formula and measured data to obtain a best fitting curve, and estimating the thrust.
On the basis of the technical scheme, the invention can be improved as follows.
In the above scheme, the calculation method of the thrust force is as follows:
and (3) obtaining stress components of all nodes of the section of the rectangular jacking pipe along the jacking direction in the jacking process of the rectangular jacking pipe under the given jacking distance and the corresponding selected grouting pressure scheme through post-processing of a numerical analysis model, carrying out weighted average according to the total number of the nodes of the section, and multiplying the average jacking pipe section stress by the sectional area of the rectangular jacking pipe to obtain the jacking force of the given jacking distance.
In the scheme, the density of the soil layer grids near the rectangular jacking pipe in the numerical analysis model is larger than that of grids at other positions.
The beneficial effects of the invention are as follows: the method can easily estimate the jacking force instead of using a time-consuming trial-and-error method to estimate the jacking force, can be well suitable for various conditions of contact between the pipeline and the soil body, ensures accurate simulation, and has the advantages that the displacement control can well estimate the jacking force of the middle section of the jacking pipe, and the estimation accuracy is higher than that of an empirical formula method.
Drawings
FIG. 1 shows a method for implementing a jacking pipe case A 1 Marking a front view of the cross section size of the three-dimensional finite element model;
FIG. 2 shows a method for implementing a jacking pipe case A 1 A side view (the soil body part is cut along the section 1-1) is marked on the right side of the three-dimensional finite element model;
FIG. 3 shows a method for implementing a jacking pipe case A 1 Labeling the three-dimensional size of the three-dimensional finite element model (the soil body part is cut along the section 1-1);
fig. 4 shows a method for implementing the jacking pipe case a 1 Position dividing diagrams (the soil body part is sectioned along the section 1-1) for calculating the jacking forces of different jacking positions;
fig. 5 grouting pressure profile schematic one (pipe section already jacked): method for implementing pipe jacking case A 1 Three-dimensional numerical analysis model: the jacking pipe is jacked by a certain distance, and grouting pressure is activated on the outer wall surface of the rectangular jacking pipe within the jacking distance range, and the grouting pressure distribution is shown in the graph;
FIG. 6 shows a method for implementing a jacking pipe case A 1 Three-dimensional numerical analysis model: pipe jacking outer wall meter with only soil jacking rangeThe grouting pressure of the surface is activated, the grouting pressure is not activated in the non-jacking part, and the figure is an illustration of the situation;
FIG. 7 shows a method for implementing a jacking pipe case A 1 A three-dimensional numerical analysis model;
FIG. 8 shows a method for implementing the jacking pipe case A 1 Three-dimensional numerical analysis model: using a jack to enable the section of the jacking pipe to distribute a cloud image along the jacking direction when the jacking pipe is jacked from 12 meters to 13.5 meters;
fig. 9 shows a method for implementing the jacking pipe case a 1 Three-dimensional numerical analysis model: using a jack to enable the section of the jacking pipe to distribute cloud pictures along the jacking direction when the jacking pipe is jacked from 27 meters to 28.5 meters;
fig. 10 shows a method of implementing the jacking pipe case a 1 Three-dimensional numerical analysis model: using a jack to enable the section of the jacking pipe to distribute cloud pictures along the jacking direction when the jacking pipe is jacked from 42 meters to 43.5 meters;
FIG. 11 shows a method for implementing the jacking pipe case A 1 Three-dimensional numerical analysis model: using a jack to enable the section of the jacking pipe to distribute cloud pictures along the jacking direction when the jacking pipe is jacked from 57 meters to 58.5 meters;
fig. 12 shows a method of implementing jacking pipe case a 1 Three-dimensional numerical analysis model: using a jack to enable the section of the jacking pipe to distribute cloud pictures along the jacking direction when the jacking pipe is jacked from 72 meters to 73.5 meters;
fig. 13 shows a method of implementing push bench case a 1 Three-dimensional numerical analysis model: using a jack to enable the section of the jacking pipe to distribute cloud pictures along the jacking direction when the jacking pipe is jacked from 87 meters to 88.5 meters;
FIG. 14 shows a push bench embodiment A 1 Actually measured, empirical formula, displacement control finite element model under different grouting pressure schemes get the comparison of the fitting relation of the jacking force along with the jacking distance;
FIG. 15 shows a push bench embodiment A 2 (design parameters, construction conditions and A) 1 Coincidence): actual measurement, empirical formula and pipe jacking embodiment A 1 The displacement control under the optimal grouting pressure scheme (grouting pressure scheme 4) has the comparison of the fitting relation of the jacking force obtained by the unit method along with the jacking distance, and the graph can be used as a verification of whether the displacement control finite unit method has spectrum adaptability or not;
FIG. 16 is a top pipe embodiment B 1 Actually measured, empirical formula, displacement control finite element model under different grouting pressure schemes get the comparison of the fitting relation of the jacking force along with the jacking distance;
FIG. 17 shows a push bench embodiment B 2 (design parameters, construction conditions and B) 1 Coincidence): actual measurement, empirical formula, push pipe embodiment B 1 Under the optimal grouting pressure scheme (grouting pressure scheme 1), the displacement control has comparison of fitting relation of the jacking force obtained by a unit method along with the jacking distance, and the graph can be used as a verification of whether the displacement control finite unit method has spectrum adaptability or not;
fig. 18 is a flowchart of a large-size rectangular push pipe jacking force estimation method based on displacement control.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1 to 18, the method for estimating the jacking force of the large-size rectangular jacking pipe based on displacement control comprises the following steps:
step 1, establishing a numerical analysis model of a soil layer-rectangular jacking pipe by using numerical analysis software Abaqus, wherein Abaqus version is Abaqus2016;
step 2, jacking positions of rectangular jacking pipes at given positions in the established numerical analysis model (jacking pipe implementation case A 1 6) are applied with a pipe section width (push pipe case A) 1 1.5 m) and a grouting pressure scheme (jacking pipe case A) 1 There are 4 grouting pressure schemes);
step 3, calculating the jacking position at each given position according to different jacking distance and grouting pressure schemes (jacking pipe embodiment A 1 6) given the jacking distance (jacking pipe case A 1 1.5 m) given a grouting pressure regime (jacking case a 1 4 grouting pressure schemes), namely different jacking forces are obtained in the jacking process, and a fitting curve of the jacking forces changing along with the jacking distance under different grouting pressure schemes is drawn;
and 4, repeating the step 2 and the step 3 to obtain different fitting curves and functional relations, comparing the fitting curves with the fitting curves and the functional relations of the jacking force along with the jacking distance in the actual engineering, and selecting an optimal jacking force fitting curve, wherein a fitting formula of the curve is used as a calculation formula of the jacking force of the rectangular jacking pipe under the same design parameters and the same construction conditions.
Fig. 4 shows a method for implementing the jacking pipe case a 1 The position dividing map (the soil body part is cut along the section 1-1) for calculating the jacking forces of different jacking positions divides 6 jacking force calculation models according to the jacking positions, and the jacking distance of each jacking force calculation model is the distance of a pipe joint, namely, 1.5m is respectively: model 1:12m-13.5m, model 2:27m-28.5m, model 3:42m-43.5m, model 4:57m-58.5m, model 5:72m-73.5m, model 6:87m-88.5m. The model can calculate the jacking force of the jacking position of the step and fit to obtain a change relation curve of the jacking force along with the jacking distance.
FIG. 7 shows a method for implementing a jacking pipe case A 1 Three-dimensional numerical analysis model: dividing rectangular pipe section units and nodes of the pipe section of the pipe, numbering the section units of the pipe section, extracting stress components of each node of the section along the jacking direction of the pipe when each model jacking pipe is jacked to the corresponding position, weighting and averaging according to the total number of the nodes, and multiplying the weighted average stress by the area of the section to obtain the internal force of the pipe, wherein the internal force is used as a jacking force representative value of jacking force of the pipe jacking to the position.
The calculation of the rectangular jacking pipe thrust is not standard, can be optimized through a round jacking pipe thrust calculation formula, and is referred to as application of an ultra-large section rectangular jacking pipe drag reduction technology in Zhengzhou bottom-through Zhongzhou large-channel tunnel engineering. The actual engineering jacking force is obtained by monitoring in the actual engineering, the comparison function is to verify the accuracy of the jacking force estimation of the numerical simulation method, and obtain estimation errors, see the attached tables 3 and 4, the jacking force estimation fitting curve is continuously compared with the actual monitoring data fitting curve by using the numerical simulation method, and the grouting pressure scheme is corrected, so that the best estimation fitting curve of the jacking force along with the jacking distance is obtained.
What needs to be further explained is: the adjustment of the grouting pressure scheme refers to fine adjustment according to grouting pressure monitoring data of engineering experience and actual engineering.
The calculation method of the thrust force comprises the following steps:
the stress component of each node of a certain pipe section along the jacking direction in the jacking process of the rectangular jacking pipe under the conditions of each given jacking position, given jacking distance and corresponding grouting pressure scheme is obtained through post-processing of a numerical analysis model (the jacking pipe implementation case A 1 Model sigma yy ) And obtaining the average node stress component of the section through weighted average, and multiplying the average node stress component by the sectional area of the pipe joint to obtain the internal force of the rectangular jacking pipe at the jacking position and the jacking distance, wherein the internal force is used as a representative value of the jacking force of the jacking pipe.
And the density of soil layer grids near the rectangular jacking pipe in the numerical analysis model is greater than that of grids at other positions.
TABLE 1 case A 1 Different grouting pressure schemes
In the jacking pipe embodiment case A1, actual measurement, an empirical formula and displacement control finite element models under different grouting pressure schemes are used for obtaining comparison of fitting relation of jacking force along with jacking distance.
TABLE 2 case B 1 Different grouting pressure schemes
And in the jacking pipe embodiment case B1, the actual measurement, an empirical formula and a displacement control finite element model under different grouting pressure schemes are used for obtaining the comparison of the fitting relation of the jacking force and the jacking distance.
TABLE 3A under different grouting pressure schemes 1 Scheme thrust estimation bias
A under different grouting pressure schemes 1 The scheme thrust estimates the bias condition.
TABLE 4 case A 2 Deviation of the thrust estimation
Push pipe embodiment case A 2 (design parameters, construction conditions and A) 1 Coincidence): actual measurement, empirical formula and pipe jacking embodiment A 1 The displacement control under the optimal grouting pressure scheme (grouting pressure scheme 4) has comparison of fitting relation of the jacking force obtained by the unit method with the jacking distance, and the graph can be used as a verification of whether the displacement control finite unit method has universality.
TABLE 5B under different grouting pressure schemes 1 Scheme thrust estimation bias comparison
Push pipe embodiment case B 1 The actual measurement, the empirical formula and the displacement control finite element model under different grouting pressure schemes are used for obtaining the comparison of the fitting relation of the jacking force along with the jacking distance.
TABLE 6 case B 2 Deviation of the thrust estimation
Push pipe embodiment case B 2 (design parameters, construction conditions and B) 1 Coincidence): the actual measurement, the empirical formula and the displacement control of the jacking pipe embodiment case B1 under the optimal grouting pressure scheme (grouting pressure scheme 1) are compared with the fitting relation of the jacking force obtained by the unit method along with the jacking distance, and the graph can be used as a verification of whether the displacement control finite unit method has universality.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (2)
1. The displacement control-based large-size rectangular jacking pipe jacking force estimation method is characterized by comprising the following steps of:
step 1, establishing a numerical analysis model of a soil layer-rectangular jacking pipe by using numerical analysis software Abaqus;
step 2, applying a given jacking distance and grouting pressure scheme to the rectangular jacking pipe according to the established numerical analysis model, wherein the applying of the given jacking distance is specifically as follows: applying a pipe section width feeding distance at a given jacking position;
step 3, obtaining different jacking forces according to different jacking distances and grouting pressure schemes, and drawing fitting curves of the jacking forces changing along with the jacking distances under different grouting pressure schemes;
the calculation method of the thrust force comprises the following steps:
the stress components of all nodes of the section of the rectangular jacking pipe along the jacking direction in the jacking process of the rectangular jacking pipe under the given jacking distance and the corresponding selected grouting pressure scheme are obtained through post-processing of a numerical analysis model, the stress is weighted and averaged according to the total number of the nodes, and the average section stress of the pipe is multiplied by the sectional area of the rectangular jacking pipe to obtain the jacking force of the given jacking distance;
and 4, repeating the step 2 and the step 3 to obtain different fitting curves and functional relations, comparing the fitting curves with the fitting curves and the functional relations of the jacking force along with the jacking distance in the actual engineering, and selecting an optimal jacking force fitting curve, wherein a fitting formula of the curve is used as a calculation formula of the jacking force of the rectangular jacking pipe under the same design parameters and the same construction conditions.
2. The displacement control-based large-size rectangular jacking force estimation method for the jacking pipe, which is disclosed in claim 1, is characterized in that the density of soil layers nearby the rectangular jacking pipe in the numerical analysis model is larger than that of other positions.
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