高压旋喷钢管组合桩的理论计算与应用研究

引用文献:

戚玉亮 周裕利 陈帅光. 高压旋喷钢管组合桩的理论计算与应用研究[J]. 建筑结构,2023,48(12):115-120,149.

QI Yuliang ZHOU Yuli CHEN Shuaiguang. Study on the theoretical calculation and application of high-pressure rotary jet steel pipe composite pile[J]. Building Structure,2023,48(12):115-120,149.

作者:戚玉亮 周裕利 陈帅光
单位:广州建筑产业研究院有限公司 广州建筑产业开发有限公司 广州建筑股份有限公司
摘要:针对沿海地区深厚软土抛填石工程场地,既有建(构)筑物地基基础长期不均匀沉降严重的问题,在充分考虑周围场地条件,结合抛填石层、深厚软土层各自特征,满足加固处理要求的前提下,提出了一种上部为钢管桩下接高压旋喷桩支承于下覆岩层的组合桩型。通过理论分析、室内模型试验、现场静载试验、数值模拟计算以及工程实例,研究认为:1)高压旋喷钢管组合桩的竖向承载力主要由水泥旋喷桩体强度控制;2)随着注浆体厚度的增大,桩的沉降量随之减小,但随着注浆体厚度的持续增大,其缩减幅度也逐渐变小;3)粗糙度的影响存在一个阈值,其对承载力和位移的影响与土的工程性质有关;4)随着注浆体水灰比的增大,桩的承载力也随之增大。采用高压旋喷钢管组合桩对既有建筑下深厚软土抛填石场地进行加固处理具有一定的合理性和可行性。
关键词:软土填石地基;既有建筑;高压旋喷钢管组合桩;加固处理;
作者简介:戚玉亮,博士,高级工程师,主要从事地基基础工程技术方面的研究工作,Email:cupid.7@163.com。陈帅光,硕士,工程师,一级建造师,主要从事地基基础工程技术方面的研究工作,Email:897237257@qq.com。
基金:国家自然科学基金项目(51678171);广州市建筑集团有限公司科技计划项目资助(2019-KJ019、2019-KJ033)。
尊敬的用户,本篇文章需要2元,点击支付交费后阅读
参考文献[1] 郑刚,龚晓南,谢永利,等.地基处理技术发展综述[J].土木工程学报,2012,45(2):127-146.
[2] 刘汉龙,赵明华.地基处理研究进展[J].土木工程学报,2016,49(1):96-115.
[3] 沈琛.基础加固方法的研究与实际工程应用[D].合肥:合肥工业大学,2014.
[4] 戚玉亮,王洪兵,骆干,等.高压旋喷微型钢管素砼桩在深厚软土填石地基加固中的应用研究[J].广州建筑,2018,46(2):28-31.
[5] 刘汉龙,任连伟,郑浩.带承台高喷插芯组合单桩荷载传递特性试验研究[J].岩石力学与工程学报,2009,28(3):525-532.
[6] 型钢水泥土搅拌墙技术规程:JGJ/T 199—2010[S].北京:中国建筑工业出版社,2010.
[7] 建筑桩基技术规范:JGJ 94—2008[S].北京:中国建筑工业出版社,2008.
[8] 建筑地基处理技术规范:JGJ 79—2012[S].北京:中国建筑工业出版社,2013.
[9] POULOS H.A practical design approach for piles with negative friction[J].ICE Proceedings Geotechnical Engineering,2008,161(1):19-27.
[10] 戚玉亮,大塚久哲.ABAQUS动力无限元人工边界研究[J].岩土力学,2014,35(10):3007-3012.
[11] 唐孟雄,戚玉亮,刘炳凯,等.大直径人工挖孔桩-土界面力学参数试验和数值仿真反演分析研究[J].建筑结构,2016,46(16):93-96,87.
[12] 戚玉亮,唐孟雄.嵌岩大直径随钻跟管桩的竖向抗压承载特性研究[J].建筑结构,2019,49(S2):808-816.
Study on the theoretical calculation and application of high-pressure rotary jet steel pipe composite pile
QI Yuliang ZHOU Yuli CHEN Shuaiguang
(Guangzhou Construction Industry Research Institute Co., Ltd. Guangzhou Construction Industry Development Co., Ltd. Guangzhou Construction Co., Ltd.)
Abstract: Aiming at the problem of long-term uneven settlement of foundations of existing buildings(structures) in deep soft soil rock-filled project sites in coastal areas, fully considering the surrounding site conditions, combining the characteristics of the rockfill layer and the deep soft soil layer, on the premise of meeting the requirements of reinforcement treatment, a composite pile type with a steel pipe pile under the high-pressure rotary jet pile supported on the overlying rock layer was proposed. Through theoretical analysis, indoor model tests, on-site static load tests, numerical simulation calculations and engineering examples, the study believes that: 1) The vertical bearing capacity of high-pressure rotary jet steel pipe composite pile is mainly controlled by the strength of cement rotary-sprayed piles; 2) As the thickness of the grouting increases, the settlement of the pile decreases, but as the thickness of the grouting continues to increase, the reduction of the pile gradually decreases; 3) There is a threshold for the influence of roughness, and its influence on the bearing capacity and displacement is related to the engineering properties of the soil; 4) As the water-cement ratio of the grouting liquid increases, the bearing capacity of the pile also increases. It is reasonable and feasible to use high-pressure rotary jet steel pipe composite pile to strengthen the deep soft soil rock-filled site under existing buildings.
Keywords: soft soil rock-filled foundation; existing building; high-pressure rotary jet steel pipe composite pile; reinforcement treatment
502 0 0
文字:     A-     A+     默认 取消