CN204753289U - System is widened to road on settlement by soaking loess foundation layer - Google Patents
System is widened to road on settlement by soaking loess foundation layer Download PDFInfo
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- 238000002791 soaking Methods 0.000 title 1
- 239000002689 soil Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000005056 compaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
本实用新型公开了一种湿陷性黄土地基层上道路拓宽体系，该湿陷性黄土地基层上道路拓宽体系包括湿陷性黄土地基层、灰土换填层、填土层、土工格栅、待拓宽道路水稳层、待拓宽道路路面、微型刚性桩以及夯实水泥土桩墙；湿陷性黄土地基层、灰土换填层、填土层、待拓宽道路水稳层以及待拓宽道路路面自下而上依次层状分布；夯实水泥土桩墙贯穿灰土换填层并纵向插入湿陷性黄土地基层中；填土层中沿填土层的纵向铺设有一层或多层土工格栅；微型刚性桩贯穿土工格栅并纵向插入原路堤中。本实用新型针对湿陷性黄土地基层上道路拓宽问题，提供了一种结构力学性能合理、整体性好以及质量可控的湿陷性黄土地基层上道路拓宽体系。
The utility model discloses a road widening system on a collapsible loess base. The road widening system on a collapsible loess base includes a collapsible loess base, a lime-soil replacement layer, a filling layer, a geogrid, The water stability layer of the road to be widened, the road surface to be widened, the micro-rigid piles and the rammed cement-soil pile wall; Layered distribution from bottom to top; rammed cement-soil pile wall penetrates the lime-soil replacement layer and inserts longitudinally into the collapsible loess base; one or more layers of geogrids are laid in the filling layer along the longitudinal direction of the filling layer; miniature Rigid piles penetrate the geogrid and are inserted longitudinally into the existing embankment. Aiming at the problem of widening roads on collapsible loess bases, the utility model provides a road widening system on collapsible loess bases with reasonable structural mechanical properties, good integrity and controllable quality.
Description
技术领域technical field
本实用新型属于湿陷性黄土地区道路拓宽工程领域，涉及一种湿陷性黄土地基层上道路拓宽体系。The utility model belongs to the field of road widening engineering in collapsible loess areas, and relates to a road widening system on a collapsible loess base.
背景技术Background technique
随着我国经济的飞速发展，公路在国民经济发展中的作用越来越突出。然而有些道路的通行能力已经不能满足交通量增大的需要，其造成时间的浪费和运输成本的提高，严重影响了区域经济的发展。为了满足急剧增长的交通要求和提高道路服务水平，更好地为经济建设服务，对道路进行拓宽成为了必然选择。With the rapid development of my country's economy, the role of roads in the development of the national economy has become more and more prominent. However, the traffic capacity of some roads can no longer meet the needs of increasing traffic volume, which causes a waste of time and an increase in transportation costs, which seriously affects the development of the regional economy. In order to meet the rapidly increasing traffic requirements and improve the road service level, and better serve the economic construction, widening the road has become an inevitable choice.
目前，道路拓宽工程中，最主要的问题就是拓宽道路与原有道路之间整体性能较差，运营过程中拓宽道路与原有道路之间差异沉降较大，纵向裂缝现象较为严重。再加之在湿陷性黄土地区，由于湿陷性黄土土质较均匀、结构疏松、孔隙发育。当在一定压力下受水浸湿，土结构会迅速破坏，产生较大附加下沉，强度迅速降低。因此，在湿陷性黄土地基层上进行道路拓宽工程，拓宽道路与原有道路之间差异沉降、纵向裂缝问题更为显著，运营过程中甚至出现失稳破坏，严重影响着拓宽后道路行车的舒适性和安全性。At present, in the road widening project, the main problem is that the overall performance between the widened road and the original road is poor. During the operation process, the difference between the widened road and the original road is relatively large, and the longitudinal cracks are more serious. In addition, in the collapsible loess area, the collapsible loess has relatively uniform soil quality, loose structure and developed pores. When soaked by water under a certain pressure, the soil structure will be destroyed rapidly, resulting in a large additional subsidence, and the strength will decrease rapidly. Therefore, when the road widening project is carried out on the collapsible loess base, the problems of differential settlement and longitudinal cracks between the widened road and the original road are more significant, and even instability and damage occur during the operation process, which seriously affects the driving safety of the widened road. Comfort and safety.
实用新型内容Utility model content
本实用新型的目的在于针对湿陷性黄土地基层上道路拓宽问题，提供了一种结构力学性能合理、整体性好以及质量可控的湿陷性黄土地基层上道路拓宽体系。The purpose of the utility model is to provide a road widening system on the collapsible loess base with reasonable structural mechanical properties, good integrity and controllable quality for the problem of road widening on the collapsible loess base.
为实现上述目的，本实用新型采用如下技术方案：In order to achieve the above object, the utility model adopts the following technical solutions:
一种湿陷性黄土地基层上道路拓宽体系，其特征在于：所述湿陷性黄土地基层上道路拓宽体系包括湿陷性黄土地基层、灰土换填层、填土层、土工格栅、待拓宽道路水稳层、待拓宽道路路面、微型刚性桩以及夯实水泥土桩墙；所述湿陷性黄土地基层、灰土换填层、填土层、待拓宽道路水稳层以及待拓宽道路路面自下而上依次层状分布；所述夯实水泥土桩墙贯穿灰土换填层并纵向插入湿陷性黄土地基层中；所述填土层中沿填土层的纵向铺设有一层或多层土工格栅；所述微型刚性桩贯穿土工格栅并纵向插入原路堤中。A road widening system on a collapsible loess base, characterized in that: the road widening system on a collapsible loess base includes a collapsible loess base, a lime-soil replacement layer, a filling layer, a geogrid, The water stability layer of the road to be widened, the road surface to be widened, the micro-rigid pile and the rammed cement-soil pile wall; The pavement is distributed in layers from bottom to top; the rammed cement-soil pile wall penetrates the lime-soil replacement layer and is inserted longitudinally into the collapsible loess base; the filling layer is laid with one or more A layer of geogrid; the micro-rigid piles penetrate the geogrid and are inserted longitudinally into the original embankment.
作为优选，本实用新型所采用的微型刚性桩是钢筋混凝土灌注桩；所述微型刚性桩的直径在150～300mm之间，所述微型刚性桩采用的混凝土强度等级不小于C30，纵筋直径不小于8mm，纵筋不少于4根；所述微型刚性桩的长度在0.8～1.2m之间；所述微型刚性桩的横向间距在1.0～1.5m之间。As a preference, the miniature rigid pile adopted in the utility model is a reinforced concrete cast-in-situ pile; the diameter of the miniature rigid pile is between 150 and 300 mm, the concrete strength grade adopted by the miniature rigid pile is not less than C30, and the diameter of the longitudinal reinforcement is not less than C30. less than 8mm, and no less than 4 longitudinal reinforcements; the length of the miniature rigid piles is between 0.8-1.2m; the transverse spacing of the miniature rigid piles is between 1.0-1.5m.
作为优选，本实用新型所采用的微型刚性桩贯穿土工格栅时由土工格栅分为上部分以及下部分；所述上部分以及下部分的长度比在1：2～1：1范围内。As a preference, when the micro rigid pile used in the utility model penetrates the geogrid, it is divided into an upper part and a lower part by the geogrid; the length ratio of the upper part and the lower part is in the range of 1:2-1:1.
作为优选，本实用新型所采用的土工格栅是多层时，相邻两层土工格栅之间的间距在0.5～1.5m范围内。As a preference, when the geogrid used in the present invention is multi-layered, the distance between two adjacent layers of geogrid is in the range of 0.5-1.5m.
作为优选，本实用新型所采用的土工格栅在0.5％延伸率时的抗拉刚度不小于500kN/m。As a preference, the tensile stiffness of the geogrid used in the present invention is not less than 500kN/m at 0.5% elongation.
作为优选，本实用新型所采用的夯实水泥土桩墙由夯实水泥土桩重叠排列组成，所述夯实水泥土桩的直径不小于0.8m，两相邻夯实水泥土桩的心距不大于夯实水泥土桩的半径，长度不小于2倍的灰土换填层的高度。As a preference, the rammed soil-cement pile wall used in the present utility model is composed of overlapping arrangements of rammed soil-cement piles, the diameter of the soil-tamped piles is not less than 0.8m, and the center-to-center distance between two adjacent soil-cement piles is not greater than that of the soil rammed piles. The radius and length of the soil pile shall not be less than 2 times the height of the lime-soil replacement layer.
作为优选，本实用新型所采用的灰土换填层的厚度Hc采用下式确定：As preferably, the thickness Hc of the lime-soil replacement layer adopted by the utility model is determined by the following formula:
其中：in:
原地基和待拓宽道路路肩下地基变形计算深度至自重应力与附加应力之比小于0.1，且将原路肩和待拓宽道路路肩下地基变形计算深度分别均匀划分为m以及n层；i是m或n层中的任意一层；The calculated depth of deformation of the foundation under the shoulder of the original foundation and the road to be widened until the ratio of the self-weight stress to the additional stress is less than 0.1, and the calculation depth of the deformation of the foundation under the shoulder of the original road and the road to be widened is evenly divided into m and n layers respectively; i is m or Any one of the n layers;
Ec为灰土换填层灰土平均压缩模量； Ec is the average compressive modulus of lime soil in the lime soil replacement layer;
为灰土换填层平均附加应力； is the average additional stress of the lime-soil replacement layer;
Esi和E′si分别为原地基和待拓宽道路路肩下地基第i层土上的平均压缩模量；E si and E′ si are the average compressive modulus of the i-th layer of soil on the original foundation and the foundation under the shoulder of the road to be widened, respectively;
和分别为原地基和待拓宽道路路肩下地基第i层土上的平均附加应力； and are the average additional stress on the i-th layer of soil on the original foundation and the foundation under the shoulder of the road to be widened, respectively;
hi和h′i分别为第i层土的厚度。h i and h′ i are the thickness of the i-th layer of soil respectively.
本实用新型的优点是：The utility model has the advantages of:
本实用新型提供了一种湿陷性黄土地基层上道路拓宽体系，该体系包括土工格栅、填土层、微型刚性桩、灰土换填层、夯实水泥土桩墙、待拓宽道路水稳层、待拓宽道路路面、湿陷性黄土地基层以及排水沟。土工格栅和微型刚性桩联合作用，显著提高了填土层和原路堤的整体稳定性；灰土换填层和夯实水泥土桩墙联合作用，消除黄土湿陷性对拓宽道路的影响，增强了拓宽地基承载力。其中，灰土换填层消除了浅层地基的湿陷性，增加了地基强度，减小了新老道路的差异沉降，而夯实水泥土桩墙有效隔离了拓宽道路外侧雨水对深层湿陷性黄土的影响，该体系有效解决了湿陷性黄土地基层上道路拓宽工程中新老道路变形协调性差，新老道路整体稳定性差以及路面开裂现象严重的问题。本实用新型无需换填路堤轻质填料、减小了湿陷性地基处理范围，经济性好。The utility model provides a road widening system on a collapsible loess soil base, the system includes a geogrid, a filling layer, a micro-rigid pile, a lime-soil replacement layer, a compacted cement-soil pile wall, and a water-stabilized layer of a road to be widened. , road surface to be widened, collapsible loess base and drainage ditches. The combination of geogrid and micro-rigid piles significantly improves the overall stability of the filling layer and the original embankment; the combination of lime-soil replacement layer and rammed cement-soil pile wall eliminates the influence of loess collapsibility on road widening and enhances the stability of the road. Expand the bearing capacity of the foundation. Among them, the lime-soil replacement layer eliminates the collapsibility of the shallow foundation, increases the strength of the foundation, and reduces the differential settlement of the old and new roads. The system effectively solves the problems of poor coordination of deformation of new and old roads, poor overall stability of new and old roads, and serious cracking of road surfaces in road widening projects on collapsible loess soil bases. The utility model does not need to replace and fill light embankment fillers, reduces the treatment range of collapsible foundations, and has good economical efficiency.
附图说明Description of drawings
图1是本实用新型所提供的湿陷性黄土地基层上道路拓宽体系的剖视结构示意图；Fig. 1 is the sectional structure schematic diagram of the road widening system on the collapsible loess base provided by the utility model;
图2是本发明所采用的灰土换填层和夯实水泥土桩墙联合结构的平面结构示意图；Fig. 2 is the plane structure schematic diagram of the lime-soil replacement layer and the compacted cement-soil pile wall joint structure adopted by the present invention;
图3是本发明所采用的土工格栅和微型刚性桩联合结构的平面结构示意图；Fig. 3 is the plane structure schematic diagram of the combined structure of geogrid and miniature rigid pile adopted by the present invention;
其中：in:
1-土工格栅；2-填土层；3-微型刚性桩；4-灰土换填层；5-夯实水泥土桩墙；6-待拓宽道路水稳层；7-待拓宽道路路面；8-湿陷性黄土地基层；9-排水沟；10-原地基；11-原路堤；12-原水稳层；13-原路面；14-待拓宽道路路肩；15-原路肩。1-Geogrid; 2-Filling layer; 3-Miniature rigid pile; 4-Lime-soil replacement layer; 5-Tamped cement-soil pile wall; -collapsible loess base; 9-drainage ditch; 10-original foundation; 11-original embankment; 12-original water stabilization layer; 13-original road surface; 14-road shoulder to be widened; 15-original road shoulder.
具体实施方式Detailed ways
下面结合附图和具体的实施例对本实用新型的湿陷性黄土地基层上道路拓宽结构做进一步的详细说明：Below in conjunction with accompanying drawing and specific embodiment, the road widening structure on collapsible loess base course of the present utility model is described in further detail:
实施例：Example:
参见图1，一种湿陷性黄土地基层上道路拓宽体系，该体系包括土工格栅1、填土层2、微型刚性桩3、灰土换填层4、夯实水泥土桩墙5、待拓宽道路水稳层6、待拓宽道路路面7、湿陷性黄土地基层8、排水沟9。Referring to Fig. 1, a road widening system on a collapsible loess soil base, the system includes a geogrid 1, a filling layer 2, a micro-rigid pile 3, a lime-soil replacement layer 4, a compacted cement-soil pile wall 5, and a wall to be widened. Road water stability layer 6, road surface to be widened 7, collapsible loess base 8, drainage ditches 9.
土工格栅1铺设于各层填土层2之间，每层土工格栅1间距为1.0m，每层填土层高度为30cm，并向原路堤11坡面开挖台阶，台阶宽度为1.2m，填土层压实度与原路堤11压实度相同。Geogrid 1 is laid between the fill layers 2 of each layer, the distance between each layer of geogrid 1 is 1.0m, the height of each fill layer is 30cm, and steps are excavated towards the slope of the original embankment 11 with a width of 1.2m , the compaction degree of the filling layer is the same as that of the original embankment 11.
微型刚性桩3距原路堤11坡面开挖台阶边缘0.5m处垂直打入原路堤，并打穿土工格栅1，微型刚性桩3和土工格栅1形成一个稳定性连接结构，以增强填土层2和原路堤11的整体稳定性。The micro-rigid pile 3 is vertically driven into the original embankment 0.5m away from the edge of the excavation step on the slope of the original embankment 11, and penetrates the geogrid 1. The micro-rigid pile 3 and the geogrid 1 form a stable connection structure to strengthen the filling. The overall stability of the soil layer 2 and the original embankment 11.
微型刚性桩3为钢筋混凝土灌注桩，直径为200mm，混凝土强度等级为C30，纵筋直径为8mm，均匀布置4根。微型刚性桩3长度为0.9m，位于土工格栅1上、下部分长度比例为1：2～1：1。微型刚性桩3间距在1.2m。The micro rigid pile 3 is a reinforced concrete cast-in-place pile with a diameter of 200mm, a concrete strength grade of C30, and a longitudinal reinforcement diameter of 8mm, with four evenly arranged. The length of the micro rigid pile 3 is 0.9m, and the length ratio of the upper part and the lower part of the geogrid 1 is 1:2-1:1. The spacing between the micro rigid piles is 1.2m.
灰土换填层4是采用灰土换填方法对拓宽部分一定高度湿陷性黄土地基层8进行换填形成，在消除湿陷性黄土地基层8湿陷性的同时，提高地基承载力。根据原路肩15和待拓宽道路路肩14沉降等量原则，灰土换填层4厚度Hc采用下式确定：The lime-soil replacement layer 4 is formed by replacing the collapsible loess base 8 with a certain height in the widened part by using the lime-soil replacement method, which improves the bearing capacity of the foundation while eliminating the collapsibility of the collapsible loess base 8 . According to the settlement equivalent principle of the original road shoulder 15 and the road shoulder 14 to be widened, the thickness Hc of the lime-soil replacement layer 4 is determined by the following formula:
式中，原地基10和待拓宽道路路肩14下地基形计算深度至自重应力与附加应力之比为0.1时为止，且将原地基10和待拓宽道路路肩14下地基变形计算深度分别均匀划分为m、n层。Ec为灰土换填层4灰土平均压缩模量，为灰土换填层4平均附加应力；Esi和E′si分别为原地基10和待拓宽道路路肩14下地基第i层土上的平均压缩模量；和分别为原地基10和待拓宽道路路肩14下地基第i层土上的平均附加应力；hi和h′i分别为第i层土的厚度。In the formula, the calculation depth of the original foundation 10 and the foundation shape under the road shoulder 14 to be widened is until the ratio of the self-weight stress to the additional stress is 0.1, and the calculation depth of the original foundation 10 and the foundation deformation under the road shoulder 14 to be widened are divided into m, n layers. E c is the average compressive modulus of lime soil in the lime soil replacement layer 4, is the average additional stress of the lime-soil replacement layer 4; E si and E' si are the average compressive modulus of the i-th layer of soil on the original foundation 10 and the foundation under the road shoulder 14 to be widened, respectively; and are the average additional stress on the i-th layer of soil under the original foundation 10 and the road shoulder 14 to be widened, respectively; h i and h′ i are the thickness of the i-th layer of soil, respectively.
基于本实用新型所提供的湿陷性黄土地基层上道路拓宽体系在进行道路拓宽时，其具体步骤如下：When the road widening system on the collapsible loess base layer provided by the utility model is widening the road, its specific steps are as follows:
A、搜集原有道路勘察设计、竣工图和养护等资料，进行原有道路和拓宽道路地勘试验，获得原有道路和拓宽道路地基物理力学参数。A. Collect original road survey and design, as-built drawings and maintenance materials, conduct geological survey tests on original roads and widened roads, and obtain physical and mechanical parameters of the foundations of original roads and widened roads.
B、根据原有道路和拓宽道路地基压缩模量、换填灰土压缩模量和拓宽道路新增荷载确定灰土换填层4厚度。B. Determine the thickness of the lime-soil replacement layer 4 according to the compressive modulus of the foundation of the original road and the widened road, the compressive modulus of the replaced lime-soil, and the new load of the widened road.
C、挖去灰土换填层4范围内湿陷性黄土，进行灰土换填，灰土压实度为96，并平整至设计地基标高。C. Excavate the collapsible loess within the scope of the lime-soil replacement layer 4, and carry out the lime-soil replacement. The compaction degree of the lime-soil is 96, and it shall be leveled to the design foundation elevation.
D、采用螺旋转法施工夯实水泥土桩墙5(参见图2)，夯实水泥土桩墙5由夯实水泥土桩重叠排列组成，夯实水泥土桩直径为0.8m，两相邻桩心距为夯实水泥土桩半径(0.4m)，长度为2倍的灰土换填层4高度，位于拓宽路堤坡脚处和排水沟9之间，以隔绝雨水对湿陷性黄土地基层8的影响。D. Construction of the rammed soil-cement pile wall 5 (referring to Fig. 2) by the spiral rotation method, the soil-cement pile wall 5 is composed of overlapping arrangements of the soil-cement piles, the diameter of the soil-cement piles is 0.8m, and the center distance between two adjacent piles is The radius of the rammed cement-soil pile (0.4m), the length of which is twice the height of the lime-soil replacement layer 4, is located between the slope foot of the widened embankment and the drainage ditch 9, to isolate the influence of rainwater on the collapsible loess base 8.
E、按规范要求进行排水沟9施工。E. Carry out drainage ditch 9 construction according to the specifications.
F、向原路堤11坡面开挖台阶，台阶宽度为1.2m，铺设第一层土工格栅1，土工格栅1应满足高强度、低徐变的要求，0.5％延伸率时土工格栅1抗拉刚度为1200kN/m；F. Excavate steps to the slope of the original embankment 11, the width of the steps is 1.2m, and lay the first layer of geogrid 1. Geogrid 1 should meet the requirements of high strength and low creep. When the elongation is 0.5%, geogrid 1 The tensile stiffness is 1200kN/m;
G、填筑一层拓宽路堤填土层2，并充分压实，压实度与原路堤11压实度相同，填土层2厚度为0.3m。G. Fill a layer of widened embankment fill layer 2 and fully compact it. The compaction degree is the same as that of the original embankment 11. The thickness of the fill layer 2 is 0.3m.
H、将微型刚性桩3在距原路堤11坡面开挖台阶边缘0.5m处垂直打入原路堤，并打穿土工格栅1(参见图3)，使微型刚性桩3与土工格栅1形成一个稳定性连接结构。H, the micro rigid pile 3 is vertically driven into the original embankment at 0.5m from the edge of the excavation step on the slope of the original embankment 11, and penetrates the geogrid 1 (see Figure 3), so that the micro rigid pile 3 and the geogrid 1 form a stable connection structure.
I、向原路堤11坡面开挖台阶，按步骤G填筑第一层拓宽路堤填土层2。1. Excavate steps to the original embankment 11 slopes, and fill the first layer of widened embankment filling layer 2 according to step G.
J、重复步骤I，填筑第二层拓宽路堤填土层2，即土工格栅1铺设设计标高。J. Repeat step I to fill the second layer of widened embankment fill layer 2, which is the design elevation of geogrid 1 laying.
K、重复步骤F～J，直至填筑至待拓宽道路水稳层6底面设计标高。K. Repeat steps F to J until the design elevation of the bottom surface of the water stability layer 6 of the road to be widened is filled.
L、待拓宽道路水稳层6施工，设计、施工要求与原水稳层12相同。L. The construction of the water-stabilized layer 6 of the road to be widened, the design and construction requirements are the same as those of the original water-stabilized layer 12.
M、待拓宽道路路面7结构施工，设计、施工要求与原路面13相同。M. The structure construction of the pavement 7 of the road to be widened, the design and construction requirements are the same as those of the original pavement 13.
该湿陷性黄土地基层上道路拓宽体系应用于山西某公路拓宽工程。该高速公路为双向四车道，经拓宽后为双向六车道。该湿陷性黄土地基层上道路拓宽体系试验段路堤顶面宽34m，填土层高度4.6m，新拓宽地基为非自重湿陷性黄土。在本实用新型应用试验段相邻路段，采用原有技术(振动碾压法)进行地基处理，对两种工况分别进行监测对比分析。采用单点位移计监测拓宽地基沉降，测斜管监测拓宽路基坡脚处侧向变形，并通过雨水冲刷试验验证本实用新型处治非自重湿陷性黄土地基层的效果。监测结果表明：与原有技术的振动碾压法相比，路堤填筑完毕时采用该方式进行道路拓宽后各监测点沉降量减小45％以上，拓宽路基坡脚处侧向位移减小55％以上。并根据雨水冲刷试验分析，与原有技术相比，采用该本实用新型进行湿陷性黄土地基层上道路拓宽时，雨水冲刷3天后地基沉降减小30％以上，差异沉降减小45％以上，路堤坡脚处侧向位移减小40％以上。最后，根据实际工况采用有限元软件进行数值模拟分析，与原有技术相比，采用该实用新型拓宽路堤稳定性增加60％以上，新老路面拉应力集中现象显著减弱，未出现路面拉裂现象。综上，该体系有效解决了湿陷性黄土地基层上道路拓宽工程中新老道路变形协调性差，新老道路整体稳定性差以及路面开裂现象严重的问题。The road widening system on the collapsible loess base is applied to a road widening project in Shanxi. The expressway is two-way four-lane, and after widening it is two-way six-lane. The width of the embankment top of the road widening system test section on the collapsible loess base is 34m, and the height of the filling layer is 4.6m. The newly widened foundation is non-self-weight collapsible loess. In the road section adjacent to the application test section of the utility model, the original technology (vibration rolling method) is used for foundation treatment, and the monitoring and comparative analysis of the two working conditions are carried out respectively. A single-point displacement meter is used to monitor the settlement of the widened foundation, and an inclinometer tube is used to monitor the lateral deformation at the slope toe of the widened subgrade, and the effect of the utility model for treating the non-self-weight collapsible loess base is verified through the rain erosion test. The monitoring results show that: compared with the vibration rolling method of the original technology, the settlement of each monitoring point is reduced by more than 45% after the road is widened using this method after the embankment is filled, and the lateral displacement at the slope toe of the widened roadbed is reduced by 55%. above. And according to the analysis of the rainwater erosion test, compared with the prior art, when the utility model is used to widen the road on the collapsible loess base, the foundation settlement will be reduced by more than 30% after three days of rainwater erosion, and the differential settlement will be reduced by more than 45%. , The lateral displacement at the foot of the embankment is reduced by more than 40%. Finally, according to the actual working conditions, the finite element software is used for numerical simulation analysis. Compared with the original technology, the stability of the embankment widened by this utility model is increased by more than 60%, the tensile stress concentration of the new and old road surfaces is significantly weakened, and no road cracks Phenomenon. In summary, this system effectively solves the problems of poor coordination of deformation of new and old roads, poor overall stability of new and old roads, and serious cracking of road surfaces in road widening projects on collapsible loess soil bases.
最后说明的是，以上实施例仅用以说明本实用新型的技术方案而非限制，尽管参照最佳实施例对本实用新型进行了详细说明，本领域的普通技术人员应当理解，可以对本实用新型的技术方案进行修改或者等同替换，而不脱离本实用新型技术方案的宗旨和范围，其均应涵盖在本实用新型的权利要求范围当中。Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the best embodiment, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.
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| CN104818658A (en) * | 2015-05-13 | 2015-08-05 | 山西省交通科学研究院 | Road widening system and road widening method for collapsible yellow earth foundation layer |
| CN107761663A (en) * | 2017-11-08 | 2018-03-06 | 江苏科技大学 | A kind of sheep pile wharf structure and its construction method |
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| CN104818658A (en) * | 2015-05-13 | 2015-08-05 | 山西省交通科学研究院 | Road widening system and road widening method for collapsible yellow earth foundation layer |
| CN107761663A (en) * | 2017-11-08 | 2018-03-06 | 江苏科技大学 | A kind of sheep pile wharf structure and its construction method |
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