模块式加筋土挡墙及力学行为现场测试中英文分析.doc

/ /模块式加筋土挡墙的力学行为现场测试中英文分析Modular mechanical behavior of reinforced soil retaining wall on site test analysis in both Chinese and English 本文通过对模块式高填方加筋土挡墙的现场测试，研究了具有高填方特征下模块式加筋土挡墙的力学行为。结果表明该挡墙具有较好的整体稳定性，实测所得侧向土压力小于通过经典理论计算的静止土压力和主动土压力，各测试断面的拉筋实测应变均小于1.0%。Based on modular high fill reinforced soil retaining wall of the field test, studies the characteristic under high fill modular mechanical behavior of reinforced soil retaining wall. Results show that the retaining wall has good overall stability, and the measured lateral earth pressure less than by classical theory of calculate the static earth pressure and the active earth pressure, the test section of the brace of the measured strain is less than 1.0%. 1 工程概况1 project summary 张承高速路部分路段线路两侧房屋密集，且还要修筑辅道。公路旁边有灌渠，灌渠的断面不可压缩，为减少公路占地，采用模块式土工格栅加筋土挡土墙，墙高4.8m6.8m。Zhang Cheng highway sections of the road lines on both sides of the house, and also build a causeway. Irrigation system by the side of the road, irrigation channel cross section is compressed, in order to reduce highway covers, adopts the modular geogrid reinforced soil retaining wall, the wall is 4.8 m 6.8 m. 加筋土挡墙模块尺寸为长宽高=0.5m0.2m0.2m。采用C25混凝土预制块作为挡墙面板，HDPE单向土工格栅在模块内预埋6cm，并外留一段完整肋条，加长土工格栅与预埋土工格栅通过连接棒连接。墙高低于3.2m的范围内每0.4m（即每两层模块）铺设一层土工格栅，在3.2m以上高度每0.6m铺设一层土工格栅。路面结构的基层中铺设两层EG90土工格栅，要求其碳黑含量应为2%2.5%，以满足土工格栅拉筋长期抗老化性能。挡墙下部土工格栅的强度大于88kN/m，相对应变不大于10%，2%应变时的抗拉强度不小于23.7kN，5%应变时的抗拉强度不小于45.2kN，长期（120年）蠕变极限强度不小于34kN/m。挡墙上部土工格栅的强度应大于64.5kN/m，相对应变不大于10%，2%应变时的抗拉强度不小于16.1kN，5%应变时的抗拉强度不小于30.9kN，长期（120年）蠕变极限强度大于25.5kN/m。由基础至墙顶在加筋土挡墙背设置25cm砂砾反滤层。在砂砾层外24.5m范围内填筑8%石灰土。素土填至3.0m，3.0m以上填筑粉煤灰，以降低路基整体重量，以达到减小填料对加筋土挡墙的压力的目的。Reinforced soil retaining wall module size for length x width x height = 0.5 m * 0.2 m * 0.2 m. Use C25 concrete precast blocks as a retaining wall panel, HDPE unidirectional geogrids embedded within the module 6 cm, outside to keep a complete rib, and lengthen the embedded grille and geogrid connected through the connecting rod. Wall height less than 3.2 m within the scope of every 0.4 m (i.e. every two layers module) laid a layer of geogrid, at 3.2 m height above every 0.6 m laying a layer of geogrids. Laying of two layers in the pavement structure of grassroots EG90 geogrid, require the carbon black content should be 2% 2%, in order to meet the geogrid brace long-term anti-aging performance. Retaining wall of the lower grille strength greater than 88 kN/m, the relative strain is not greater than 10%, 2% strain when the tensile strength of not less than 23.7 kN, 5% strain in the tensile strength of not less than 45.2 kN, (120) for a long time creep limit strength of not less than 34 kN/m. The strength of the retaining wall upper grille should be greater than 64.5 kN/m, relative strain is not more than 10%, 2% strain tensile strength of not less than 16.1 kN, 5% strain tensile strength of not less than 30.9 kN, (120) for a long time creep limit strength is greater than 25.5 kN/m. From the base to the wall in the reinforced soil retaining wall back setting 25 cm gravel filter layer. Outside the gravel layer 2 4.5 m within the scope of filling 8% lime soil. Dirt to 3.0 m, 3.0 m above the filling of fly ash, in order to reducing the overall weight, in order to achieve the filling pressure of the retaining wall is reduced. 2 测点布设方案2 measuring point layout scheme 在现场选取三个断面进行试验。A断面处地基采用深层水泥搅拌桩处理，灰土内3m高度填素土，3m以上填粉煤灰；B断面同样采用深层水泥搅拌桩复合地基，石灰土上填筑粉煤灰；C断面采用挤密砂砾桩复合地基处理，灰土上填筑粉煤灰。We do test on three sections at the scene. A section of foundation with deep cement mixing piles, the high fill soil, lime soil in 3 m 3 m above fill in fly ash; B section also USES the deep cement mixing pile composite foundation, embankment of calcareous soil on fly ash; C section USES gravel compaction pile composite foundation treatment, embankment of fly ash lime soil. 3 测试结果与分析3 test results and analysis 3.1 竖向土压力3.1 the vertical earth pressure 施工初期，基于土工格栅与墙面板的连接作用，在施工振动荷载效应下，挡墙有所内倾。随着施工进度的发展，墙逐步填高，墙面板承受的土压力也逐步增大，墙背在主动土压力作用下会发生向外的水平位移，引起墙体外倾。施工完成后墙外侧土压力仍然大于内侧土压力，但两者差值较路基填筑初期减少。上述土压力结果与竣工后墙面板的小量水平变形结果具有一致性。Early construction, the connection effect, based on the wall panel and geogrid under construction vibration load effect, the retaining wall is batter. Gradually along with the development of the construction progress, wall fill high, wall panel inherit the earth pressure is gradually increased, the wall back will happen in the active earth pressure under the action of horizontal displacement of the outward, caused the wall flare. Construction to complete the back wall of the lateral soil pressure is greater than the inside of the still earth pressure, but the difference between the initial reduce subgrade filling. Completed the earth pressure and back wall panel, the minimum level of consistent deformation results. 各断面在施工期间基底竖向应力随填土高度增长的分布曲线以及竣工后各时间的分布如图23所示。Each section during the construction of basement vertical distribution curve of stress with the filling height growth, and each time after the completion of the distribution of as shown in figure 2 3. （1）随着填土高度的增大，基底竖向土压力不断增大，应力增长速率基本相当。(1) with the increase of filling soil height, basal vertical soil pressure increasing, the stress growth rate. （2）竣工后的基底竖向应力随时间基本呈下降的趋势。这是由于在加筋土挡墙的自重荷载作用下复合地基发生沉降。有柔性土工格栅设置在土中会产生 薄膜或网兜效应，土工格栅对土体形成托举力，从而改变了竖向应力分布，土体自重作用在基底上的竖向土压力降低。(2) after the completion of basement vertical stress basic present decreasing trend with time. This is because the reinforced soil retaining wall under the gravity loads of composite foundation settlement. Flexible geogrid is set in the soil will produce film or net effect, the geogrid on soil formation lift, which changes the vertical stress distribution, the weight of soil on the base of the vertical earth pressure is reduced. （3）由于深层水泥搅拌桩复合地基的桩土应力比大于挤密砂砾桩复合地基的桩土应力比，使得深层水泥搅拌桩复合地基中不同部位的竖向应力不均匀性较大。由于加筋土体与非加筋土体和墙面之间的相互作用，竖向土压力沿筋长呈曲线分布，而设计中的竖向土压力分布没有考虑这种因素。3.2 墙背侧向土压力(3) because of the deep cement mixing pile composite foundation of pile soil stress ratio is greater than the compaction pile soil stress ratio of gravel pile composite foundation, makes the deep cement mixing pile composite foundation in different parts of the vertical stress nonuniformity is bigger. Because the reinforced body and the interaction between the reinforced soil mass and metope, the vertical earth pressure distribution along the reinforcement length is curve, and the design of the vertical earth pressure distribution does not take into account this factor. 3.2 back wall lateral earth pressure 图4是三个测试断面中侧向土压力值随填土高度提高的变化曲线。墙背土压力规律分析如下：Figure 4 is three test sections in the lateral earth pressure along with the change of filling soil height increase curve. Wall back earth pressure law analysis is as follows: （1）施工期间不同层位处的侧向土压力随填土高度的提高而增大，土压力增长速率随高度增加而减小。这是由于随着填土高度的增加，挡墙发生水平变形，从导致侧向土压力减少。当填土高度达4.5m以上时，挡墙最底部土压力减小，并且挤密砂砾桩复合地基上挡墙土压力减小量明显大于水泥搅拌桩复合地基上挡墙的土压力减小量。一则说明前者的水平位移大于后者，二则可能与挤密砂砾桩复合地基在荷载作用下发生排水固结，地基沉降量大于水泥搅拌桩符合地基沉降量有关。(1) located in the lateral earth pressure of different layers during the period of construction and fill soil increases with the increase of altitude, soil pressure growth rate decreases with increasing height. This is because with the increase of filling soil height, retaining wall horizontal deformation, from lead to lateral earth pressure decreases. When the filling height of 4.5 m above the bottom of the retaining wall is the most earth pressure is reduced, and gravel compaction pile composite foundation, retaining wall on earth pressure reduction is significantly greater than the cement mixing pile composite foundation, retaining wall of earth pressure on the reduction is. A shows that the horizontal displacement of the former than the latter, two possible with gravel compaction pile in composite foundation load under the action of drainage consolidation, foundation settlement amount is greater than the cement mixing pile in foundation settlement. （2）侧向土压力沿墙高呈非线性形式分布。在墙高的中部以下，挤密砂砾桩复合地基上加筋土挡墙的侧向土压力逐渐减小，在靠近墙底部位接近零，而水泥搅拌桩桩复合地基上加筋土挡墙的侧向土压力呈增大趋势。（3）各断面实测侧向土压力均小于依照经典土压力理论计算的静止土压力和主动土压力。说由于土工格栅拉筋作用与筋土摩擦作用，以及格栅对土体嵌固作用，使加筋土挡墙具有一定整体稳定性，但挡墙面板实际受力很小。(2) the distribution of lateral earth pressure along wall height in the form of nonlinear. Under high in the middle of the wall, gravel compaction pile composite foundation on reinforced soil retaining wall of the lateral earth pressure decreases, near the bottom of the wall close to zero, and the cement mixing pile composite foundation on reinforced soil retaining wall of the lateral earth pressure showed a trend of increase. (3) each section of the measured lateral earth pressure less than in accordance with the classical earth pressure theory and active earth pressure of static earth pressure is calculated. Said because the brace effect with geogrid reinforcement soil friction role, and grille on the built-in function of soil, the reinforced soil retaining wall has a certain overall stability, but the actual bearing small retaining wall panel. （4）从图可以看出，在施工期两种复合地基上加筋土挡墙墙高3 m 以下位置墙后填料相同，而实测水平土压力也大致相当，说明了测试结果的可靠性。(4) can be seen from the graph, during construction on the two kinds of composite foundation reinforced soil retaining wall under 3 m high wall after packing the same location, and the measured lateral earth pressure also roughly, illustrates the reliability of test results. 通过实测数据与经典理论解的对比分析，可以得出以下结论：Through comparing and analyzing the measured data and the theoretical solution of classic can draw the following conclusions: （1）基底竖向土压力随填土高度的提高而增大，但应力增长速率基本相同，沿筋长方向，呈非线性分布最大值发生在拉筋中间部位。Base (1) the vertical earth pressure along with the filled s