CN116108540A - Calculation method for creep deformation of high embankment after construction - Google Patents
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Abstract
Description
技术领域Technical Field
本发明涉及一种工后蠕变变形量的计算方法，具体为一种高路堤工后蠕变变形量的计算方法，属于路基施工技术领域。The invention relates to a method for calculating the post-construction creep deformation, in particular to a method for calculating the post-construction creep deformation of a high embankment, and belongs to the technical field of roadbed construction.
背景技术Background Art
路基是路面结构的基础，当路基在施工完成之后产生不均匀沉降时，会影响对路面结构的均匀支撑作用，使路面结构在行车荷载的作用下加速破坏。The roadbed is the foundation of the pavement structure. When uneven settlement occurs after the construction of the roadbed is completed, it will affect the uniform support of the pavement structure and accelerate the destruction of the pavement structure under the action of vehicle loads.
一般的情况下，在计算路堤的沉降时通常忽略路堤填土自身的变形，而只计算地基在路堤填土和路面结构材料的自重及行车荷载作用下的沉降变形。这对于低矮的路堤而言是可行的。但是，对于填土高度较大的路堤而言，因为填筑高度大、自重大，路堤土体在自重及行车荷载作用下产生的土压力较大，其长期蠕变变形也相应较大，不应被忽略，否则可能影响到路面质量和使用寿命，因此我们提出了一种高路堤工后蠕变变形量的计算方法。In general, when calculating the settlement of an embankment, the deformation of the embankment fill itself is usually ignored, and only the settlement deformation of the foundation under the deadweight of the embankment fill and pavement structure materials and vehicle loads is calculated. This is feasible for low embankments. However, for embankments with large fill heights, due to the large fill height and heavy deadweight, the earth pressure generated by the embankment soil under the deadweight and vehicle loads is large, and its long-term creep deformation is also correspondingly large, which should not be ignored, otherwise it may affect the quality and service life of the pavement. Therefore, we propose a method for calculating the post-construction creep deformation of high embankments.
发明内容Summary of the invention
本发明的目的就在于为了解决上述问题而提供一种高路堤工后蠕变变形量的计算方法，根据土体试件在分级加载蠕变变形中最后一级荷载作用下的蠕变变形，建立了土体的工后蠕变模型，然后根据路堤的填筑历史，可计算得到路堤顶面的工后蠕变变形随时间的发展过程。The purpose of the present invention is to provide a method for calculating the post-construction creep deformation of a high embankment in order to solve the above-mentioned problem. A post-construction creep model of the soil is established based on the creep deformation of the soil specimen under the last level of load in the graded loading creep deformation. Then, based on the filling history of the embankment, the development process of the post-construction creep deformation of the top surface of the embankment over time can be calculated.
本发明通过以下技术方案来实现上述目的，一种高路堤工后蠕变变形量的计算方法，包括以下步骤：The present invention achieves the above-mentioned purpose through the following technical scheme, a method for calculating the creep deformation of a high embankment after construction, comprising the following steps:
S1、将行车荷载作用换算成相同重量的路面材料厚度，以代替行车荷载用于路堤土体的土压力计算；S1. Convert the vehicle load into the thickness of the pavement material of the same weight to replace the vehicle load for calculating the earth pressure of the embankment soil;
S2、根据高路堤的填筑过程，计算分析出各层土体的受力历史；S2. According to the filling process of the high embankment, calculate and analyze the stress history of each layer of soil;
S3、取用于填筑路堤的土体，成型试件进行相应分级荷载作用下的三轴蠕变试验，分析并建立该土体在相应的分级荷载作用下的工后蠕变变形方程；S3. Take the soil used for embankment filling, form specimens and conduct triaxial creep tests under corresponding graded loads, analyze and establish the post-construction creep deformation equation of the soil under corresponding graded loads;
S4、根据路堤中各层土体的受力历史，以及土体在相应加载历史作用下的工后蠕变方程，计算出各层土体的工后蠕变变形；S4. Calculate the post-construction creep deformation of each layer of soil according to the stress history of each layer of soil in the embankment and the post-construction creep equation of the soil under the corresponding loading history;
S5、将各层土体的工后蠕变变形叠加，即可得到整个路堤顶面的工后蠕变变形。S5. By superimposing the post-construction creep deformation of each layer of soil, the post-construction creep deformation of the entire embankment top surface can be obtained.
优选的，路堤工后蠕变变形考虑到路基分层施工时，上层土体的填筑会补平其下各层土体在前期产生的变形。Preferably, the post-construction creep deformation of the embankment takes into account that when the roadbed is constructed in layers, the filling of the upper soil layer will make up for the deformation of the lower soil layers produced in the early stage.
优选的，所述各层土体的受力历史计算包括以下步骤：Preferably, the force history calculation of each layer of soil includes the following steps:
S1、根据位于该土层以上的各层土体的自重，计算出该土层承受到的土压力的大小变化过程；S1. Calculate the change process of the earth pressure on the soil layer according to the deadweight of each layer of soil above the soil layer;
S2、根据位于其上的各层土体的施工期和稳定期的时间天数，确定该层土体承受各级土压力的时间天数，从而获得各层土体的受力历史。S2. According to the construction period and stabilization period of each layer of soil located above it, determine the number of days that the soil layer bears various levels of soil pressure, so as to obtain the stress history of each layer of soil.
本发明的有益效果是：根据路堤分层施工的工艺特点，提出了路堤工后蠕变的概念；根据路堤分层施工的工艺特点，指出路堤的工后蠕变变形应只是土体在分级加载的蠕变中最后一级荷载作用下产生的变形；而不是整个路堤中各层土体的从施工开始起产生的总蠕变量的叠加；根据土体试件在分级加载蠕变变形中最后一级荷载作用下的蠕变变形，建立了土体的工后蠕变模型，可得到路堤顶面的工后蠕变变形随时间的发展过程。The beneficial effects of the present invention are as follows: based on the technological characteristics of the layered construction of the embankment, the concept of post-construction creep of the embankment is proposed; based on the technological characteristics of the layered construction of the embankment, it is pointed out that the post-construction creep deformation of the embankment should only be the deformation of the soil under the last level of load in the creep of graded loading; rather than the superposition of the total creep amount of each layer of soil in the entire embankment generated since the beginning of construction; based on the creep deformation of the soil specimen under the last level of load in the creep deformation of graded loading, a post-construction creep model of the soil is established, and the development process of the post-construction creep deformation of the top surface of the embankment with time can be obtained.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明土体试件在分级荷载作用下的蠕变规律。FIG. 1 shows the creep law of the soil specimen of the present invention under graded load.
具体实施方式DETAILED DESCRIPTION
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
本发明实施例公开一种高路堤工后蠕变变形量的计算方法。The embodiment of the present invention discloses a method for calculating the post-construction creep deformation of a high embankment.
根据附图1所示，包括变形特点、计算步骤和计算实例，According to the attached figure 1, including deformation characteristics, calculation steps and calculation examples,
所述计算步骤包括以下步骤：The calculation step comprises the following steps:
S1、将行车荷载作用换算成相同重量的路面材料厚度，以代替行车荷载用于路堤土体的土压力计算；S1. Convert the vehicle load into the thickness of the pavement material of the same weight to replace the vehicle load for calculating the earth pressure of the embankment soil;
S2、根据路堤的填筑工序，计算分析出各层土体的受力历史。S2. According to the filling process of the embankment, calculate and analyze the stress history of each layer of soil.
S3、取用于填筑路堤的土体，成型试件进行相应分级荷载作用下的三轴蠕变试验，分析并建立该土体在相应的分级荷载作用下的工后蠕变变形方程；S3. Take the soil used for embankment filling, form specimens and conduct triaxial creep tests under corresponding graded loads, analyze and establish the post-construction creep deformation equation of the soil under corresponding graded loads;
S4、根据路堤中各层土体的受力历史，以及土体在相应加载历史作用下的工后蠕变方程，计算出各层土体的工后蠕变变形；S4. Calculate the post-construction creep deformation of each layer of soil according to the stress history of each layer of soil in the embankment and the post-construction creep equation of the soil under the corresponding loading history;
S5、将各层土体的工后蠕变变形叠加，即可得到整个路堤顶面的工后蠕变变形。S5. By superimposing the post-construction creep deformation of each layer of soil, the post-construction creep deformation of the entire embankment top surface can be obtained.
根据路堤分层施工的工艺特点，提出了路堤工后蠕变的概念；根据路堤分层施工的工艺特点，指出路堤的工后蠕变变形应只是土体在分级加载的蠕变中最后一级荷载作用下产生的变形；而不是整个路堤中各层土体的从施工开始起产生的总蠕变量的叠加；根据土体试件在分级加载蠕变变形中最后一级荷载作用下的蠕变变形，建立了土体的工后蠕变模型，可得到路堤顶面的工后蠕变变形随时间的发展过程。According to the technological characteristics of layered construction of embankments, the concept of post-construction creep of embankments is proposed; according to the technological characteristics of layered construction of embankments, it is pointed out that the post-construction creep deformation of embankments should only be the deformation of soil under the last level of load in the creep of graded loading; rather than the superposition of the total creep amount generated by each layer of soil in the entire embankment since the beginning of construction; according to the creep deformation of soil specimens under the last level of load in the creep deformation of graded loading, a post-construction creep model of soil is established, and the development process of post-construction creep deformation of the top surface of the embankment with time can be obtained.
路堤的修筑采用分层铺筑、分层碾压成型的施工工艺，因此路堤的蠕变变形，与通常的材料在恒定荷载下的蠕变相比，具有以下特点：The embankment is built using a layered paving and layered rolling process. Therefore, the creep deformation of the embankment has the following characteristics compared to the creep deformation of common materials under constant load:
①每层土体的铺筑和压实均会对下部的各层土体产生一定的土压力，下层土体受到的土压力是逐渐增大的；① The paving and compaction of each layer of soil will produce a certain amount of earth pressure on the lower layers of soil, and the earth pressure on the lower layer of soil will gradually increase;
②各层土体在位于其上部的各层土体自重的作用下，在填土的摊铺和碾压施工期、沉降稳定期内均会产生蠕变变形；② Each layer of soil will produce creep deformation under the action of the deadweight of the layers of soil above it during the spreading and rolling construction period of fill and the settlement stabilization period;
③路堤各层填土的填筑施工是按标高控制，在路堤的施工期间，下部土体产生的蠕变而引起的表面沉降，在摊铺上层土体时会予以补平，下层土体在前期产生的蠕变变形，对于上层土体表面而言不复存在。③ The filling construction of each layer of embankment is controlled according to the elevation. During the construction of the embankment, the surface settlement caused by the creep of the lower soil will be leveled when the upper soil is spread. The creep deformation of the lower soil in the early stage no longer exists for the surface of the upper soil.
路堤中各层土体在整个路堤的分层填筑施工过程中的蠕变是一个作用荷载逐级增大的蠕变过程，各级荷载的大小及作用时间，与路堤的施工过程有关；路堤顶面在施工完成之后的蠕变变形量(工后蠕变)应该只是路堤土体在路面结构层的施工期及后期道路营运期间的行车荷载作用下产生的蠕变变形。The creep of each layer of soil in the embankment during the layered filling construction process of the entire embankment is a creep process with gradually increasing loads. The size and action time of each load are related to the construction process of the embankment. The creep deformation of the top surface of the embankment after the construction is completed (post-construction creep) should only be the creep deformation of the embankment soil under the action of vehicle loads during the construction period of the pavement structure layer and the later road operation period.
在试验时，按照拟定的分级荷载大小和作用时间，先对试件施加最小一级的荷载，待试件的蠕变变形趋于稳定后，再将荷载增加到下一级荷载；During the test, according to the planned graded load size and action time, the smallest load is first applied to the specimen, and after the creep deformation of the specimen tends to be stable, the load is increased to the next level;
按照土体的受力历史加载完成后，以试件在最后一级荷载作用下的蠕变变形随时间而变化的数据，整理得到土体在该加载历史作用下的工后蠕变变形方程。After the loading is completed according to the force history of the soil, the creep deformation equation of the soil under the loading history is obtained by sorting out the data of the creep deformation of the specimen under the last level of load changing with time.
计算实例包括以下步骤：The calculation example includes the following steps:
S1、根据路堤的高度，将其划分成不同的施工层，设路堤的高度为10m，分5层施工，每层厚度为2m；S1. Divide the embankment into different construction layers according to its height. Assume that the embankment is 10m high and constructed in 5 layers, with each layer 2m thick.
S2、计算各层土体的加载历史：以路基表面为竖坐标Z轴的原点，竖直向下为Z轴正方向；根据各土层上、下表面的Z坐标值，采用σzi＝∑y路面H路面+y±Zi，计算出各层上表面和下表面的压应力，取其平均值作为路基最终成型后，该土层中的竖向压应力σi；S2. Calculate the loading history of each soil layer: take the roadbed surface as the origin of the vertical coordinate Z axis, and vertically downward as the positive direction of the Z axis; according to the Z coordinate values of the upper and lower surfaces of each soil layer, use σ zi = ∑ypavement Hpavement + y ± Zi to calculate the compressive stress of the upper and lower surfaces of each layer, and take the average value as the vertical compressive stress σ i in the soil layer after the roadbed is finally formed;
为计算简单，假定各层土体的自重对下层土体产生的压应力为0.02MPa，路面结构材料及行车荷载对路基顶面的压应力为0.03MPa；For the sake of simplicity in calculation, it is assumed that the compressive stress of the soil layer caused by the deadweight of each layer is 0.02MPa, and the compressive stress of the pavement structure material and vehicle load on the top surface of the roadbed is 0.03MPa.
土层1：正压力0.03MPa；土层2：正压力0.02-0.05MPa；土层3：正压力0.02-0.04-0.07MPa；土层4：正压力0.02-0.04-0.06-0.09MPa；土层5：正压力0.02-0.04-0.06-0.08-0.11MPa；Soil layer 1: positive pressure 0.03MPa; soil layer 2: positive pressure 0.02-0.05MPa; soil layer 3: positive pressure 0.02-0.04-0.07MPa; soil layer 4: positive pressure 0.02-0.04-0.06-0.09MPa; soil layer 5: positive pressure 0.02-0.04-0.06-0.08-0.11MPa;
S3、对土体试件进行分级加载作用下的三轴蠕变试验，试验时，待试件的蠕变变形趋于稳定后，再将荷载增加到下一级，直到完成整个加载历史；S3. Perform triaxial creep tests on soil specimens under graded loading. During the test, after the creep deformation of the specimens tends to be stable, the load is increased to the next level until the entire loading history is completed;
S4、对试件在分级加载蠕变试验中采集到的最后一级加载时的蠕变随时间的变化数据，进行整理，得到土体的工后蠕变方程ε(δ,t)；S4. The creep variation data of the specimen at the last level of loading collected in the graded loading creep test are sorted out to obtain the post-construction creep equation ε(δ,t) of the soil;
对土体试件进行了分级加载蠕变试验，得到的蠕变随荷载大小、荷载作用时间的变化关系，得到多条蠕变曲线；The soil specimens were subjected to graded loading creep tests, and the relationship between creep and load size and load action time was obtained, and multiple creep curves were obtained;
土体在最后一级荷载作用下的蠕变量随时间的变化关系，可以采用双曲线模型
S5、根据各层土体的受力历史(填筑施工历史)中最后一级荷载的大小，以及该层土体的厚度Hi，计算出该层土体的工后蠕变δi(t)，δi(t)＝εi(t)*Hi；S5. According to the magnitude of the last load in the stress history (fill construction history) of each layer of soil and the thickness Hi of the layer of soil, calculate the post-construction creep δi (t) of the layer of soil, δi (t) = εi (t) * Hi ;
S6、将各层土层的工后蠕变变形叠加，即可得到路堤顶面的工后蠕变变形随时间的发展过程δ(t)，即：δ(t)＝∑δi(t)＝∑δi(t)·Hi；S6. Superimposing the post-construction creep deformation of each soil layer, the development process of the post-construction creep deformation of the top surface of the embankment over time δ(t) can be obtained, that is: δ(t) = ∑δ i (t) = ∑δ i (t)·H i ;
本发明在使用时，根据路堤分层施工的工艺特点，提出了路堤工后蠕变的概念；根据路堤分层施工的工艺特点，指出路堤的工后蠕变变形应只是土体在分级加载的蠕变中最后一级荷载作用下产生的变形；而不是整个路堤中各层土体的从施工开始起产生的总蠕变量的叠加；根据土体试件在分级加载蠕变变形中最后一级荷载作用下的蠕变变形，建立了土体的工后蠕变模型，可得到路堤顶面的工后蠕变变形随时间的发展过程。When the present invention is used, according to the technological characteristics of the layered construction of the embankment, the concept of post-construction creep of the embankment is proposed; according to the technological characteristics of the layered construction of the embankment, it is pointed out that the post-construction creep deformation of the embankment should only be the deformation of the soil under the last level of load in the creep of graded loading; rather than the superposition of the total creep amount generated by each layer of soil in the entire embankment since the beginning of construction; according to the creep deformation of the soil specimen under the last level of load in the creep deformation of graded loading, a post-construction creep model of the soil is established, and the development process of the post-construction creep deformation of the top surface of the embankment with time can be obtained.
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
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