【作者】 刘永超； 王硕； 李兵兵； 肖涌涛； 李玉龙；

【Author】 LIU Yongchao;WANG Shuo;LI Bingbing;XIAO Yongtao;LI Yulong;School of Civil Engineering, Tianjin University;Tianjin Construction Inheritance Group Limited Company;China Railway Construction Corporation Limited;Tianjin Bochuan Construction Engineering Company;

【机构】 天津大学建筑工程学院； 天津建城基业集团有限公司； 中铁建设集团有限公司； 天津市博川建设工程有限公司；

【摘要】 高压旋喷桩施工过程中会对周围土体产生挤压作用,从而对桩周邻近范围内的既有结构产生影响。利用挤土效应对邻近结构进行纠偏对维护建筑结构安全和稳定性具有重要意义。本研究通过了一系列高压旋喷桩施工的原位试验,研究了高压旋喷桩施工对临近既有水井结构的竖向位移变化及其发展规律,对施工顺序、喷浆压力和施工间距等参数进行敏感性分析。结果表明:高压旋喷桩的施工会引起临近既有水井结构抬升,相较于施工顺序和施工间距,临近既有结构抬升量受喷浆压力影响较大,20MPa时约为15MPa时的2.2倍,且工后反沉程度也被平均影响30%;持续施工会导致地基土受到持续的扰动,从而施工浆液发生叠加劈裂,使得临近水井结构抬升效果更明显;既有水井结构的竖向抬升幅度随与试验桩的距离的增加而降低,在桩-井间距固定而桩-桩间距不同时,既有水井结构的竖向抬升幅度受已施工完成的高压旋喷桩形成的阻隔效应影响明显。更多还原

【Abstract】 During the construction of high-pressure rotary jet piles, the surrounding soil undergoes compaction, thereby affecting existing structures within the immediate vicinity of the pile. Utilizing the soil displacement effect to correct adjacent structures is crucial for maintaining the safety and stability of building structures. This study conducted a series of in-situ tests during high-pressure rotary jet grouting construction, Tianjin. It investigated the vertical displacement changes and development patterns of adjacent existing water well structures caused by the construction, performing sensitivity analyses on parameters such as construction sequence, grouting pressure, and construction spacing. Results indicate: Construction of high-pressure rotary jet grouting piles causes uplift in adjacent existing well structures.Compared to construction sequence and spacing, uplift magnitude is significantly influenced by grout pressure—approximately 2.2 times greater at 20MPa than at 15MPa—with post-construction settlement reversal also affected by an average of 30%. Continuous construction causes sustained disturbance to the foundation soil, leading to cumulative splitting of the construction slurry and amplifying the uplift effect on nearby well structures; The vertical uplift of existing well structures decreases with increasing distance from the test piles. When the pile-well spacing is fixed but the pile-pile spacing varies, the vertical uplift of existing well structures is significantly influenced by the barrier effect created by the completed high-pressure jet grouting pile.更多还原