CN116108540A - Calculation method for creep deformation of high embankment after construction - Google Patents
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Abstract
The invention discloses a calculation method of creep deformation of a high embankment after construction, which comprises the following steps: s1, converting the action of the travelling load into the thickness of the pavement material with the same weight so as to replace the travelling load for calculating the soil pressure of the embankment soil body; s2, calculating and analyzing stress histories of soil bodies of all layers; s3, taking a soil body for filling the embankment, performing a triaxial creep test under the action of a corresponding grading load on a formed test piece, and analyzing and establishing a post-construction creep deformation equation of the soil body under the action of the corresponding grading load; s4, calculating post-construction creep deformation of the soil body of each layer; and S5, overlapping the post-construction creep deformation of the soil bodies of all layers to obtain the post-construction creep deformation of the top surface of the embankment. The beneficial effects of the invention are as follows: considering the characteristics of the layered construction of the embankment, according to the creep deformation of the soil body test piece under the effect of the last stage of load in the grading loading creep deformation, a post-construction creep model of the soil body is established, and the development process of the post-construction creep deformation of the top surface of the embankment along with time can be obtained.
Description
Technical Field
The invention relates to a calculation method of post-construction creep deformation, in particular to a calculation method of post-construction creep deformation of a high embankment, and belongs to the technical field of roadbed construction.
Background
The roadbed is the foundation of the road surface structure, and when the roadbed generates uneven settlement after construction is completed, the uniform supporting effect on the road surface structure can be influenced, so that the road surface structure is damaged in an accelerating way under the action of running load.
In general, deformation of the embankment fill itself is usually ignored when calculating settlement of the embankment, but settlement deformation of the foundation under the action of dead weights of the embankment fill and the pavement structural materials and driving loads is calculated only. This is possible for a low embankment. However, for embankment with larger filling height, because the filling height is large and the dead weight is large, the soil pressure generated by the embankment soil body under the dead weight and the driving load is large, the long-term creep deformation of the embankment soil body is correspondingly large, and the long-term creep deformation of the embankment soil body is not ignored, otherwise, the road surface quality and the service life are possibly influenced, so the calculation method of the creep deformation of the embankment after construction is provided.
Disclosure of Invention
The invention aims to solve the problems and provide a calculation method of the post-construction creep deformation of a high embankment, which establishes a post-construction creep model of a soil body according to the creep deformation of a soil body test piece under the last stage of load action in the stage loading creep deformation, and then calculates the development process of the post-construction creep deformation of the top surface of the embankment along with time according to the filling history of the embankment.
The invention realizes the aim through the following technical scheme, and the method for calculating the creep deformation of the embankment after construction comprises the following steps:
s1, converting the action of the travelling load into the thickness of the pavement material with the same weight so as to replace the travelling load for calculating the soil pressure of the embankment soil body;
s2, calculating and analyzing stress histories of soil bodies of all layers according to the filling process of the high embankment;
s3, taking a soil body for filling the embankment, performing a triaxial creep test under the action of a corresponding grading load on a formed test piece, and analyzing and establishing a post-construction creep deformation equation of the soil body under the action of the corresponding grading load;
s4, calculating post-construction creep deformation of each layer of soil according to the stress histories of the soil in each layer of the embankment and the post-construction creep equation of the soil under the action of the corresponding loading histories;
and S5, overlapping the post-construction creep deformation of the soil bodies of all layers to obtain the post-construction creep deformation of the top surface of the whole embankment.
Preferably, the creep deformation after embankment construction considers the deformation of each layer of soil body under the embankment caused in the earlier stage when the roadbed is constructed in a layered manner.
Preferably, the calculating of the stress history of the soil body of each layer comprises the following steps:
s1, calculating the change process of the soil pressure born by the soil layer according to the dead weight of soil bodies of all layers above the soil layer;
s2, determining the time days of bearing each level of soil pressure of the soil body according to the construction period and the time days of the stabilization period of the soil body of each layer on the soil body, so as to obtain the stress history of the soil body of each layer.
The beneficial effects of the invention are as follows: according to the technical characteristics of the layered construction of the embankment, the concept of creep after embankment construction is provided; according to the technical characteristics of the layered construction of the embankment, indicating that post-construction creep deformation of the embankment is only deformation of a soil body under the action of a final stage of load in the creep of the graded loading; rather than the superposition of the total creep amount generated from the construction start of soil bodies of all layers in the whole embankment; according to the creep deformation of the soil body test piece under the last stage of load action in the grading loading creep deformation, a post-construction creep model of the soil body is established, and the development process of post-construction creep deformation of the top surface of the embankment along with time can be obtained.
Drawings
FIG. 1 shows the creep rule of the soil test piece according to the invention under the action of a graded load.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a calculation method of creep deformation of a high embankment after construction.
According to the illustration of fig. 1, including deformation characteristics, calculation steps and calculation examples,
the calculating step comprises the following steps:
s1, converting the action of the travelling load into the thickness of the pavement material with the same weight so as to replace the travelling load for calculating the soil pressure of the embankment soil body;
s2, calculating and analyzing the stress history of soil bodies of each layer according to the filling process of the embankment.
S3, taking a soil body for filling the embankment, performing a triaxial creep test under the action of a corresponding grading load on a formed test piece, and analyzing and establishing a post-construction creep deformation equation of the soil body under the action of the corresponding grading load;
s4, calculating post-construction creep deformation of each layer of soil according to the stress histories of the soil in each layer of the embankment and the post-construction creep equation of the soil under the action of the corresponding loading histories;
and S5, overlapping the post-construction creep deformation of the soil bodies of all layers to obtain the post-construction creep deformation of the top surface of the whole embankment.
According to the technical characteristics of the layered construction of the embankment, the concept of creep after embankment construction is provided; according to the technical characteristics of the layered construction of the embankment, indicating that post-construction creep deformation of the embankment is only deformation of a soil body under the action of a final stage of load in the creep of the graded loading; rather than the superposition of the total creep amount generated from the construction start of soil bodies of all layers in the whole embankment; according to the creep deformation of the soil body test piece under the last stage of load action in the grading loading creep deformation, a post-construction creep model of the soil body is established, and the development process of post-construction creep deformation of the top surface of the embankment along with time can be obtained.
The construction of the embankment adopts a construction process of layered paving and layered rolling forming, so that the creep deformation of the embankment has the following characteristics compared with the creep deformation of common materials under constant load:
(1) the laying and compaction of each layer of soil body can generate certain soil pressure to each layer of soil body at the lower part, and the soil pressure born by the soil body at the lower layer is gradually increased;
(2) under the action of the dead weight of the soil body of each layer positioned on the upper part of the soil body, creep deformation can be generated in the paving and rolling construction period and the sedimentation stabilization period of the filled soil;
(3) the filling construction of each layer of filling soil of the embankment is controlled according to elevation, during the construction of the embankment, the surface sedimentation caused by creep deformation generated by the soil body at the lower part can be supplemented when the soil body at the upper layer is paved, and the creep deformation generated by the soil body at the lower layer at the earlier stage does not exist on the surface of the soil body at the upper layer.
Creep of soil bodies of all layers in the embankment in the layered filling construction process of the whole embankment is a creep process with gradually increased acting load, and the magnitude and acting time of each level of load are related to the construction process of the embankment; the creep deformation amount of the top surface of the embankment after construction (creep after construction) should be only creep deformation of the embankment soil body under the action of driving load during construction period of the pavement structure layer and later period of road operation.
In the test, according to the size and the action time of the planned classified load, firstly, the load of the smallest stage is applied to the test piece, and after the creep deformation of the test piece tends to be stable, the load is increased to the load of the next stage;
after the loading of the stress history of the soil body is completed, the creep deformation equation of the soil body after construction under the loading history is obtained by arranging the data of the creep deformation of the test piece under the action of the load of the last stage, which changes along with time.
The computing example includes the steps of:
s1, dividing the embankment into different construction layers according to the height of the embankment, setting the height of the embankment to be 10m, and constructing the embankment in 5 layers, wherein the thickness of each layer is 2m;
s2, calculating loading histories of soil bodies of all layers: taking the surface of the roadbed as the origin of a Z axis of a vertical coordinate, and taking the vertical downward direction as the positive direction of the Z axis; according to Z coordinate values of upper and lower surfaces of each soil layer, adopting sigma zi ＝∑y Road surface H Road surface +y ± Z i Calculating the compressive stress of the upper surface and the lower surface of each layer, taking the average value as the vertical compressive stress sigma in the soil layer after the roadbed is finally molded i ；
For simple calculation, the compressive stress generated by the dead weight of each layer of soil body on the lower layer of soil body is assumed to be 0.02MPa, and the compressive stress of the pavement structural material and the travelling load on the top surface of the road base is assumed to be 0.03MPa;
soil layer 1: positive pressure 0.03MPa; soil layer 2: positive pressure of 0.02-0.05MPa; soil layer 3: positive pressure is 0.02-0.04-0.07MPa; soil layer 4: positive pressure is 0.02-0.04-0.06-0.09MPa; soil layer 5: positive pressure of 0.02-0.04-0.06-0.08-0.11MPa;
s3, performing a triaxial creep test under the graded loading effect on the soil body test piece, and increasing the load to the next stage after the creep deformation of the test piece tends to be stable during the test until the whole loading history is completed;
s4, finishing the creep change data of the test piece during the last stage loading collected in the stage loading creep test to obtain a post-construction creep equation epsilon (delta, t) of the soil body;
carrying out a grading loading creep test on a soil test piece to obtain a change relation of creep along with load size and load acting time, and obtaining a plurality of creep curves;
creep deformation of soil body under the action of final stage load at any timeThe change relation between the two can adopt a hyperbolic model
Characterization; and (3) obtaining a post-construction creep equation by regression:
s5, according to the size of the last stage load in the stress history (filling construction history) of the soil body of each layer and the thickness H of the soil body of each layer i Calculating the post-construction creep delta of the soil body of the layer i (t)，δ i (t)＝ε i (t)*H i ；
S6, overlapping the post-construction creep deformation of each soil layer to obtain the development process delta (t) of the post-construction creep deformation of the top surface of the embankment along with time, namely: delta (t) = Σdelta i (t)＝∑δ i (t)·H i ；
When the invention is used, the concept of creep after embankment construction is provided according to the process characteristics of embankment layered construction; according to the technical characteristics of the layered construction of the embankment, indicating that post-construction creep deformation of the embankment is only deformation of a soil body under the action of a final stage of load in the creep of the graded loading; rather than the superposition of the total creep amount generated from the construction start of soil bodies of all layers in the whole embankment; according to the creep deformation of the soil body test piece under the last stage of load action in the grading loading creep deformation, a post-construction creep model of the soil body is established, and the development process of post-construction creep deformation of the top surface of the embankment along with time can be obtained.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (3)
1. A calculation method of creep deformation of a high embankment after construction comprises the following steps:
s1, converting the action of the travelling load into the thickness of the pavement material with the same weight so as to replace the travelling load for calculating the soil pressure of the embankment soil body;
s2, calculating and analyzing stress histories of soil bodies of all layers according to the filling process of the embankment;
s3, taking a soil body for filling the embankment, performing a triaxial creep test under the action of a corresponding grading load on a formed test piece, and analyzing and establishing a post-construction creep deformation equation of the soil body under the action of the corresponding grading load;
s4, calculating post-construction creep deformation of each layer of soil according to the stress histories of the soil in each layer of the embankment and the post-construction creep equation of the soil under the action of the corresponding loading histories;
and S5, overlapping the post-construction creep deformation of the soil bodies of all layers to obtain the post-construction creep deformation of the top surface of the whole embankment.
2. The method for calculating the creep deformation after construction of the high road embankment according to claim 1, wherein the method comprises the following steps: the creep deformation after embankment construction considers that when roadbed layered construction is carried out, the filling of the upper soil body can fill up the deformation of each lower soil body in the earlier stage.
3. The method for calculating the creep deformation after construction of the high road embankment according to claim 1, wherein the method comprises the following steps: the stress history calculation of the soil body of each layer comprises the following steps:
s1, calculating the change process of the soil pressure born by the soil layer according to the dead weight of soil bodies of all layers above the soil layer;
s2, determining the time days of bearing each level of soil pressure of the soil body according to the construction period and the time days of the stabilization period of the soil body of each layer on the soil body, so as to obtain the stress history of the soil body of each layer.
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