高速铁路技术
高速鐵路技術
고속철로기술
HIGH SPEED RAILWAY TECHNOLOGY
2014年
3期
67-71
,共5页
分层总和法%轴重%铁路路基%工后沉降
分層總和法%軸重%鐵路路基%工後沉降
분층총화법%축중%철로로기%공후침강
layered summation method%axle load%railway subgrade%post-construction settlement
根据直线变形体理论，采用弹性理论法计算铁路地基的附加应力。根据分层叠加的原理，采用分层总和法对双线有砟重载铁路的路基在填土高度为2m、4m、6m、8m，铁路轴重与路基工后沉降之间的关系进行了研究，得到了不同铁路轴重下，路基工后沉降的变化规律。研究表明：填高分别为2m、4m、6m、8m，土层厚度即为压缩层厚度（≤50 m）时，不同土层厚度与不同轴重情况下路基工后沉降满足Ⅰ级铁路不大于20cm的要求；填高分别为2m、4m、6m、8m时，轴重40t时的工后沉降与轴重22t时的平均比值分别约为1.68、1.54、1.43、1.34。可以看出随着填高的增加，平均比值呈现减小的趋势；随着填高的增加，工后沉降量增大，但轴重增加对工后沉降增加影响将变小。
根據直線變形體理論，採用彈性理論法計算鐵路地基的附加應力。根據分層疊加的原理，採用分層總和法對雙線有砟重載鐵路的路基在填土高度為2m、4m、6m、8m，鐵路軸重與路基工後沉降之間的關繫進行瞭研究，得到瞭不同鐵路軸重下，路基工後沉降的變化規律。研究錶明：填高分彆為2m、4m、6m、8m，土層厚度即為壓縮層厚度（≤50 m）時，不同土層厚度與不同軸重情況下路基工後沉降滿足Ⅰ級鐵路不大于20cm的要求；填高分彆為2m、4m、6m、8m時，軸重40t時的工後沉降與軸重22t時的平均比值分彆約為1.68、1.54、1.43、1.34。可以看齣隨著填高的增加，平均比值呈現減小的趨勢；隨著填高的增加，工後沉降量增大，但軸重增加對工後沉降增加影響將變小。
근거직선변형체이론，채용탄성이론법계산철로지기적부가응력。근거분층첩가적원리，채용분층총화법대쌍선유사중재철로적로기재전토고도위2m、4m、6m、8m，철로축중여로기공후침강지간적관계진행료연구，득도료불동철로축중하，로기공후침강적변화규률。연구표명：전고분별위2m、4m、6m、8m，토층후도즉위압축층후도（≤50 m）시，불동토층후도여불동축중정황하로기공후침강만족Ⅰ급철로불대우20cm적요구；전고분별위2m、4m、6m、8m시，축중40t시적공후침강여축중22t시적평균비치분별약위1.68、1.54、1.43、1.34。가이간출수착전고적증가，평균비치정현감소적추세；수착전고적증가，공후침강량증대，단축중증가대공후침강증가영향장변소。
According to the linear deformation theory,the additional stress of railway foundation was calculated by using the elastic theory method.Based on the principle of layer summation,the layered summation method was used for double ballast overloaded railway roadbed with the filling height of 2 m,4 m,6 m,8 m.The relationship between post-con-struction settlement and different railway axle load,the change laws of the sedimentation of roadbed were obtained.The results showed that,when the filling height reached respectively 2 m,4 m,6 m,8 m,while the soil thickness is defined as the compression layer thickness (≤50 m),the post-construction settlement different soil layer thickness and differ-ent axle load satisfied the requirement of gradeⅠrailway which is not more than 20 cm,but it not when the filling height reached 6m,the soil layer thickness was 50 m and the axle load was 40t.The average ratio of post-construction between the 40 t axle load and 22 t axle load appeared 1.68,1.54,1.43,1.34 under the filling height of 2 m,4 m,6 m,8 m, which could be seen that with the increase of filling height,the average ratio decreased.The post-construction settlement increased with the increasing of filling height,but the influence on post-construction settlement decreased with the in-crease of axle load.
