侧向辐射注浆技术处治现役高速公路沉降分析

发布时间：2018-06-02 10:32

本文选题：侧向辐射注浆 + 现役高速公路　；参考：《岩土力学》2017年S1期

【摘要】：以连-盐(连云港-盐城)高速公路灌云段为对象,在不影响正常通车的情况下采用侧向辐射注浆技术进行路基加固处理。针对侧向辐射注浆路基加固机制的问题,利用ABAQUS有限元建立数值模型,通过对比有限元计算的注浆加固过程路面隆起、注浆后路面沉降、土体侧向位移和超静孔压与现场试验的测量值,验证了数值模型的可靠性。基于数值模型开展参数分析研究,研究结果表明,侧向辐射注浆技术能够有效地控制现役高速公路的沉降变形,试验路段注浆加固减小沉降达5 cm;注浆率是影响路面隆起量并提高土体压缩模量的主要参数,最终沉降随注浆率增大而线性减小;当注浆土体力学指标较大时注浆加固土体的效果会减弱,但不会对注浆隆起量造成明显影响;对路基的加固时间越早,注浆加固控制沉降的效果就越明显;侧向注浆侧向辐射注浆技术简便,施工过程不影响高速公路正常通车,在控制现役高速公路沉降治理时有较大优势。
[Abstract]:Taking the Guanyun section of Lianyungang Yancheng Expressway as the object, the lateral radiation grouting technology was adopted to reinforce the roadbed without affecting the normal traffic. Aiming at the problem of reinforcement mechanism of lateral radiation grouting subgrade, the numerical model is established by using ABAQUS finite element method, and the pavement uplift and settlement after grouting are compared with the finite element method. The reliability of the numerical model is verified by the measured values of lateral displacement and over static pore pressure of soil and field tests. Based on the numerical model, the parameter analysis is carried out. The results show that the lateral radiation grouting technology can effectively control the settlement and deformation of the active highway. The grouting rate is the main parameter that affects the pavement uplift and increases the compression modulus of the soil, and the final settlement decreases linearly with the increase of the grouting rate. When the mechanical index of grouting soil is larger, the effect of grouting reinforcement will be weakened, but it will not have obvious influence on the quantity of grouting uplift, the earlier the reinforcement time of roadbed is, the more obvious the effect of grouting reinforcement on controlling settlement will be. Lateral grouting with lateral radiation grouting is simple and convenient, and the construction process does not affect the normal opening of expressway, so it has a great advantage in controlling the settlement of active expressway.
【作者单位】：重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;河海大学土木与交通学院;School
【基金】：国家自然科学基金项目(No.51420105013) 高等学校学科创新引智计划资助(No.B13024)~~
【分类号】：U418.5

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