【作者】 邓开鸿； 汪益敏； 陈页开；

【Author】 DENG Kai-hong 1 , WANG Yi-min 1 , CHEN Ye-kai 2 1. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China 2. School of Civil Engineering & Transportation, South China University of Technology, Guangzhou 510640, China

【机构】 华南理工大学亚热带建筑科学国家重点实验室； 华南理工大学土木与交通学院；

【摘要】 高压旋喷桩施工对周围土体产生明显的挤压作用,容易引起邻近既有结构物变形和破坏.以新建广州和谐型大功率机车检修基地地基加固工程现场试验为基础,基于浆液流体性质及渗透理论,建立数值分析模型,模拟和分析研究高压旋喷桩施工对管桩基础产生的影响.研究结果表明:旋喷桩施工引起周围土体产生较大的侧向位移,当地基中分布有软塑状黏土层和中砂层时,该深度位置土体受到的侧向挤压作用最明显,发生的深部侧向位移最大,基础管桩的接头不适宜于设置在该类土层中.管桩的变形与旋喷桩施工顺序密切相关,单侧施工使基础管桩产生较大的侧向变形,旋喷桩在基础管桩双侧对称施工有利于减小对管桩的影响,旋喷桩施工不宜在距离管桩2.5m以内范围进行.更多还原

【Abstract】 High pressure jet grouting easily brings great compression to the surrounding soil and causes adjacent existing structures deformation and destruction. Based on the field experiments at newly built Guangzhou harmony type high-power locomotive maintenance base foundation strengthening project, a numerical model which considered the grouting fluid property and penetration theory was built to simulate the influences caused by the construction of high pressure jet grouting on the pipe pile foundation. The analysis results show that a great lateral displacement in the surrounding soil was caused by the high pressure of jet grouting. The most significant lateral deformation was happened at the depth of soft plastic-like clay layer and medium sand layer distributed. Therefore, it is not appreciated to set the pipe pile joints at this type of soils. The research results also show that the deformation of pipe pile foundation was closely related to the construction sequence of jet grouting. A greater lateral compression displacement was brought by the unilateral construction order. It can help to reduce the negative influence of jet grouting on pipe-pile by adopting symmetrical construction sequence arrangement. It is not recommended that the jet grouting construction is located in the diameter of 2.5 m from pipe pile foundation.更多还原