高强格栅桩-网地基荷载传递桩-土应力特性  

Stress features of piles-soils in load transfer of high-strength grid pile-net foundation

作　　者：于跟社 商拥辉[3] 徐林荣[1,4] YU Gen-she;SHANG Yong-hui;XU Lin-rong(School of Civil Engineering,Central South University,Changsha 410075,China;CCCC Mechanical and Electrical Engineering Bureau Co.,Ltd.,Beijing 100088 China;Institute of Architecture and Engineering,Huanghuai University,Zhumadian 463000,China;National Engineering Laboratory for High Speed Railway Construction,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中交机电工程局有限公司,北京100088 [3]黄淮学院建筑工程学院,驻马店463000 [4]高速铁路建造技术国家工程实验室,长沙410075

出　　处：《吉林大学学报（工学版）》2024年第6期1730-1737,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(42172322,U2268213,42007419);河南省科技攻关重点研发项目(232102241040);湖南省教育厅科学研究项目优秀青年基金项目(21B0226);黄淮学院培育基金项目(XKPY-2022017);驻马店市重点研发专项项目(ZMDSZDZX20230066).

摘　　要：为揭示高强格栅桩-网复合地基上部路堤荷载传递过程中桩-土应力的传递特性,依托某高铁高强格栅桩-网复合地基工程背景,建立了适合较小桩-土差异沉降桩-网复合地基荷载传递特性分析的修正土拱模型,并将理论计算桩-土应力比与现场测试结果进行对比,验证模型的合理性。结果表明:本文修正模型计算的桩-土应力比与现场测试结果吻合度高,验证了模型的可靠性;相同条件下,土拱效应影响范围随填土高度的增加呈变小趋势,拉膜特征值随桩-土差异沉降的增加呈指数增大;高强格栅因具有“拉膜架驭”效应,桩-土协同发挥承载功效在填筑期基本完成,最终稳定时桩-土应力比为3.8~4.0。同时,对比桩-土应力比与沉降随填筑荷载变化规律可知,前者对填筑荷载的敏感性略大于沉降,说明利用桩-土应力比可达到高铁路基控沉效果评估的目的。研究成果可为高速铁路桩-网复合地基精细化建造提供理论依据。In order to reveal in depth the pile-soil stress transfer features of the upper embankment load transfer process of the high-strength grid pile-net composite foundation,relying on the background of the high-strength grid pile-net composite foundation engineering of a high-speed railway,a modified soil arch model suitable for the analysis of load transfer characteristics of small pile-soil differential settlement pile-net composite foundation was established,and the theoretically calculated pile-soil stress was compared with field test results to verify the rationality of the modified model.The results show that the revised model highly matches the field test results in calculating the pile-soil stress ratio,verifying the reliability of the model.Under the same conditions,the influence range of the soil arching effect decreases with the increase of the filling height,and the characteristic value of the tensile film increases exponentially with the increase of the pile-soil differential settlement.Under the effect of high-strength grille"pulling membrane to stand",the pile-soil cooperative effect is basically completed during the filling period,and the rang of pile-soil stress ratio is 3.8~4.0 when it is stable.At the same time,by comparing the change rule of pile-soil stress ratio and settlement with the filling load,it can be seen that the former is slightly more sensitive to the filling load than the settlement,which shows that the pile-soil stress ratio can also be used to evaluate the effect of controlling the settlement of high railway foundation.The research results can provide theoretical basis for the fine construction of pile-net composite foundation of high-speed railway.

关 键 词：高强格栅 桩-土应力比 桩-网复合地基 荷载传递 高速铁路 

分 类 号：TU470[建筑科学—结构工程]