穿越无充填溶洞时单桩承载特性研究  

Study on Bearing Characteristics of Single Pile Crossing Unfilled Karst Cave

作　　者：张乾青[1,2] 乔胜石 邢宇铖 张凯 崔伟 王志远 陈迪杨 ZHANG Qianqing;QIAO Shengshi;XING Yucheng;ZHANG Kai;CUI Wei;WANG Zhiyuan;CHEN Diyang(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;Research Institute of New Material and Intelligent Equipment,Shandong University,Dezhou 251114,China;Shandong Luqiao Group Co.Ltd.,Jinan 250021,China;School of Qilu Transportation,Shandong University,Jinan 250002,China)

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]山东大学(齐河)新材料与智能装备研究院,山东德州251114 [3]山东省路桥集团有限公司,山东济南250014 [4]山东大学齐鲁交通学院,山东济南250002

出　　处：《湖南大学学报（自然科学版）》2022年第7期186-196,共11页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52078278);山东省泰山学者青年专家项目(tsqn202103163);山东大学齐鲁青年学者计划项目,。

摘　　要：为解决穿越溶洞型单桩的设计难题,研究了穿越无充填溶洞时单桩的承载特性.基于现场物探和室内试验结果明确了溶洞的发育情况和岩土体的物理力学参数,采用有限元软件建立了14组数值计算模型,分别对不同溶洞半径、不同溶洞位置及不同桩径的工况进行了模拟,确定了BoxLucas1荷载传递模型的适用性,提出了穿越无充填溶洞单桩的承载特性计算方法.研究结果表明,桩径增加和溶洞充填时溶洞对单桩承载力的影响将得到削弱,溶洞的半径和位置对桩基承载力具有显著影响.实际工程中应重视前期物探对溶洞发育情况的准确探查,降低溶洞对桩基承载力的影响.相关研究成果可为岩溶区单桩参数设计和承载力预测提供理论依据.To solve the design problem of single pile crossing karst caves in practice,the bearing capacity of a single pile crossing unfilled karst cave was analyzed in this paper. Based on the field geophysical and laboratory test results,the distribution of the karst cave and the physical and mechanical parameters of rock and soil were determined. Fourteen groups of numerical calculation models were established by using finite element software to capture the bearing characteristics of a single pile crossing an unfilled karst cave under different conditions of cave radius, cave position and pile diameter. The applicability of the BoxLucas1 load transfer model was verified by using numerical results. A calculation method was then proposed to predict the response of a single pile crossing unfilled karst caves. The present study showed that the influence of karst caves on the bearing capacity of a single pile was weakened by increasing pile diameter and filling karst caves,and the radius and position of karst caves had a significant influence on the single pile bearing capacity. For practical purposes,the accurate exploration of karst cave distribution should be paid attention to,which was beneficial to reducing the influence of karst caves on single pile bearing capacity. The proposed calculation method can provide a theoretical basis for parameter design and estimation of the bearing capacity of a single pile in the karst area.

关 键 词：岩溶区 物探方法 穿越溶洞型单桩 承载特性 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]