桩板墙加固边坡作用效果及结构受力影响试验研究  

Experimental Study on Slope Reinforcement Effect and Structure Stress of Pile-sheet Wall

作　　者：李梅[1] 刘校 LI Mei;LIU Xiao(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Wuhan Hengda Sifang Engineering Co.LTD,Wuhan 430061,China)

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]武汉恒达四方工程有限公司,湖北武汉430061

出　　处：《金属矿山》2020年第10期190-196,共7页Metal Mine

基　　金：国家自然科学基金项目(编号:51104111)。

摘　　要：作为边坡治理中的一种常用支挡结构,桩板墙主要依靠抗滑桩对滑坡进行加固,并利用桩间挡土板防止桩间土体产生滑动,但其设计基于经验类比,桩板墙加固边坡过程中的受力分配、结构受力等机理还有待深入研究。项目以实际工程边坡为依托,通过室内模型试验、数值模拟和理论分析,研究桩板墙加固边坡的加固效果、挡土板对桩身受力的影响、桩板体系各自承担的滑坡推力大小、桩板结构各自的受力和变形规律等,并对桩间距和挡土板强度等参数改变下桩板墙结构的变化规律进行了分析。研究表明:挡土板承担一部分滑坡推力,随着荷载增加,挡土板承受的土压力不断增加,挡土板所受的土压力峰值均在滑体以下部分;不同加载条件下桩身所受滑坡推力近似呈抛物线分布,滑坡推力峰值主要集中在滑面中下部;桩距较大时,两桩间土体呈拱形向下滑动,挡土板对桩间土体下滑有一定的支挡作用;挡土板强度对边坡加固效果影响不大。研究成果可为桩板墙加固边坡设计提供参考。Pile-sheet wall,a commonly used retaining structure in slope management,mainly depends on piles forstrengthening landslides,and utilizes retaining plates to prevent soil sliding between piles,while its design is based on em-pirical analogy,and the mechanism of distribution of force and structural stress in the process of slope reinforcement withpile-sheet wall remains to be further studied. Based on the actual slope engineering,this paper studies the reinforcement ef-fect of the slop reinforcement with pile-sheet wall,the influence of the retaining plate on the pile and the landslide thrust as-sumed by the pile-plate system,the respective stress and deformation of the pile-plate structure,etc. with resort to indoormodel tests,numerical simulation and theoretical analysis. And the change of the pile-sheet wall structure under the changeof parameters such as the pile spacing and the strength of the retaining plate is analyzed. The research indicates that the re-taining plate bears part of the landslide thrust,the earth pressure on the retaining plate also increases with the increase ofload,and the peak value of the earth pressure on the retaining plate is below the sliding body. The thrust of landslide regard-ing the pile body is approximately parabolic under various loading conditions,and the peak of the landslide thrust is mainlyfocused on the middle and lower parts of the sliding surface. The soil between the two piles slides downward in an arch shapewhen the pile spacing is large and the retaining plate provides certain support for the soil between the piles. The strength ofthe retaining plate has little effect on the slope reinforcement effect. The research results can provide a reference for the de-sign of the slope reinforcement with sheet-pile wall.

关 键 词：桩板墙 边坡加固 结构受力 滑坡推力 桩距 

分 类 号：TD854.6[矿业工程—金属矿开采]