贵州地区嵌岩群桩承载性状与优化设计理论研究
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摘要
嵌岩桩是广大山区岩基上大型构(建)筑物重要的基础型式,目前虽已开展了大量的研究,但嵌岩群桩承载机理及设计理论目前仍是岩土工程、基础工程领域研究的空白。本论文在系统阐述层状岩体力学特性、嵌岩单桩承载机理的基础上,以三维有限元数值模拟手段,深入研究了嵌岩群桩的承载性状及优化设计理论,取得如下成果:
(1)通过对层状岩体现有研究成果的总结和归纳,从强度和变形的角度,系统研究了层状岩体的力学性状;并将层状岩体分为水平和倾斜两种情况,分析了基础直接作用于岩体上时的受力特征。
(2)以嵌岩单桩承载性状为研究重点,分析了全阻嵌岩桩的桩侧摩阻力与桩端阻力的承载机理、影响因素和计算方法。并以此为基础,理论分析了嵌岩群桩的承载机理,总结了现有规范中进行嵌岩单桩、嵌岩群桩的设计方法及其存在的不足。
(3)在建立嵌岩群桩的理想计算模型的基础上,以三维有限元数值模拟为手段,结合嵌岩群桩的P-S曲线和各桩应力状态,系统研究了嵌岩群状的受荷过程,及桩长、嵌岩深度、桩身强度、基岩强度等对其承载性能的影响。
(4)基于(3)中所建的嵌岩群桩计算模型,以三维有限元软件数值模拟为手段,结合嵌岩群桩的P-S曲线和各桩应力状态,系统研究了嵌岩群桩在改变桩长、改变嵌岩深度等情况下承载性状的变化,并系统总结了嵌岩群桩优化设计的原理与方法。
本论文首次对贵州地区层状岩体中嵌岩群桩的承载性状与其优化设计理论开展了较为全面、系统的研究。这对提高嵌岩群桩承载机理的认识、指导嵌岩群桩的优化设计均有重要的理论意义、现实意义和较广阔的应用前景。
Rock-socketed piles are the important foundation type for large building in mountain area. Although a lot of research was developed in the field of geotechnical engineering and foundation engineering, It's blank to the bearing mechanism and optimization design of rock-socketed pile group. This paper made a systematic exposition of mechanical properties for layered rock mass and bearing mechanism of rock-socketed pile. On the basis of this, the load transferring capacity and the optimization design for rock-socketed pile group is studied thorough, by 3D finite element numerical simulation. The obtained achievements are listed as follow:
1. According to the concludes and summarizes of the existing research results to layered rock mass, mechanical properties for layered rock mass is researched systematically from the view of strength and deformation; the stress characteristics for foundation effect directly on the upper of rock is analyzed on leveled and declined layered intrusion situation.
2. Focus on the bearing behavior of rock-socketed pile, bearing mechanism, influencing factors and calculation method for side resistance and end resistance in whole resistance rock-socketed pile is analyzed. On the basis of this, this paper discusses the bearing mechanism of rock-socketed pile group, and summarizes the deficiency of the design method for rock-socketed pile in existing standard.
3. By using three-dimensional finite element procedure, the calculation model of rock-socketed pile group was established. Through P-S curve and stress state for rock-socketed pile group, the bearing load process of rock-socketed pile group is researched. The paper discusses effection factors of bearing behavior such as pile length, rock-socketed length, pile strength, bedrock strength.
4. Based on the established calculation model and 3D finite element numerical simulation, the variation of bearing behavior for rock-socketed pile group is researched on changing the pile length and rock-socketed length. And principle of optimum design for rock-socketed pile group is summarized systematically.
This article firstly roundly and systematically theoretical studies the load transferring capacity and optimization design of rock-socketed pile group in layered rock mass of Guizhou Karst region. The research has significant theoretical meaning, practical meaning for further investigating working mechanism of rock-socketed pile group. Especially the optimization model provides a wide application prospect for the actual engineering.
(1)通过对层状岩体现有研究成果的总结和归纳,从强度和变形的角度,系统研究了层状岩体的力学性状;并将层状岩体分为水平和倾斜两种情况,分析了基础直接作用于岩体上时的受力特征。
(2)以嵌岩单桩承载性状为研究重点,分析了全阻嵌岩桩的桩侧摩阻力与桩端阻力的承载机理、影响因素和计算方法。并以此为基础,理论分析了嵌岩群桩的承载机理,总结了现有规范中进行嵌岩单桩、嵌岩群桩的设计方法及其存在的不足。
(3)在建立嵌岩群桩的理想计算模型的基础上,以三维有限元数值模拟为手段,结合嵌岩群桩的P-S曲线和各桩应力状态,系统研究了嵌岩群状的受荷过程,及桩长、嵌岩深度、桩身强度、基岩强度等对其承载性能的影响。
(4)基于(3)中所建的嵌岩群桩计算模型,以三维有限元软件数值模拟为手段,结合嵌岩群桩的P-S曲线和各桩应力状态,系统研究了嵌岩群桩在改变桩长、改变嵌岩深度等情况下承载性状的变化,并系统总结了嵌岩群桩优化设计的原理与方法。
本论文首次对贵州地区层状岩体中嵌岩群桩的承载性状与其优化设计理论开展了较为全面、系统的研究。这对提高嵌岩群桩承载机理的认识、指导嵌岩群桩的优化设计均有重要的理论意义、现实意义和较广阔的应用前景。
Rock-socketed piles are the important foundation type for large building in mountain area. Although a lot of research was developed in the field of geotechnical engineering and foundation engineering, It's blank to the bearing mechanism and optimization design of rock-socketed pile group. This paper made a systematic exposition of mechanical properties for layered rock mass and bearing mechanism of rock-socketed pile. On the basis of this, the load transferring capacity and the optimization design for rock-socketed pile group is studied thorough, by 3D finite element numerical simulation. The obtained achievements are listed as follow:
1. According to the concludes and summarizes of the existing research results to layered rock mass, mechanical properties for layered rock mass is researched systematically from the view of strength and deformation; the stress characteristics for foundation effect directly on the upper of rock is analyzed on leveled and declined layered intrusion situation.
2. Focus on the bearing behavior of rock-socketed pile, bearing mechanism, influencing factors and calculation method for side resistance and end resistance in whole resistance rock-socketed pile is analyzed. On the basis of this, this paper discusses the bearing mechanism of rock-socketed pile group, and summarizes the deficiency of the design method for rock-socketed pile in existing standard.
3. By using three-dimensional finite element procedure, the calculation model of rock-socketed pile group was established. Through P-S curve and stress state for rock-socketed pile group, the bearing load process of rock-socketed pile group is researched. The paper discusses effection factors of bearing behavior such as pile length, rock-socketed length, pile strength, bedrock strength.
4. Based on the established calculation model and 3D finite element numerical simulation, the variation of bearing behavior for rock-socketed pile group is researched on changing the pile length and rock-socketed length. And principle of optimum design for rock-socketed pile group is summarized systematically.
This article firstly roundly and systematically theoretical studies the load transferring capacity and optimization design of rock-socketed pile group in layered rock mass of Guizhou Karst region. The research has significant theoretical meaning, practical meaning for further investigating working mechanism of rock-socketed pile group. Especially the optimization model provides a wide application prospect for the actual engineering.
引文
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[2].水利水电科学研究院等合编.岩石力学参数手册[M].北京:水利电力出版社,1991.
[3].中华人民共和国交通部主编.公路桥涵与基础设计规范(JTJ024-85).北京:人民交通出版社,1994.
[4].中华人民共和国建设部主编.建筑地基基础设计规范(GB50007-2002).北京:中国建筑工业出版社,2003.
[5].王宏图,鲜学福,贺建民,魏福生.层状复合岩体力学的相似性模拟[J].矿山压力与顶板管理,1999.No.2:81-83.
[6].王远祥.嵌岩桩荷载传递及承载机理研究[D].浙江:浙江大学,2005.
[7].王国民.嵌岩钻孔灌注桩的荷载传递性状[J],岩土工程学报,1996,18(2):99-104.
[8].付军.竖向荷载作用下桩基础承载性状研究[D].湖南:中南大学,2004.
[9].卢世深.按变形率计算嵌岩桩垂直承载力的探讨[J].公路,1981,(06):13-19.
[10].卢应发,吴玉山.一种以P-S曲线求解桩的荷载和沉降分布的方法[J].岩土力学,1995,16(1):63-69.
[11].冯国栋,刘祖德,黄绍铿.铅直荷载下桩一台共同作用的计算模式探讨[A].第四届全国土力学及基础工程学术会议论文选集[C].中国建筑工业出版社,1986:275-280.
[12].史佩栋,梁晋渝.嵌岩桩的竖向承载力[J].工业建筑,1993,(07):38-43.
[13].朱伯芳.有限元法原理与应用(第二版)[M].中国水利水电出版社,1998,119-135.
[14].刘松玉等.大直径泥质软岩嵌岩灌注桩的荷载传递特性[J],岩土工程学报,1998,20(4):58-61.
[15].刘金砺,迟铃泉.桩土变形计算模型和变刚度调平设计[J].岩土工程学报,Vol.22,No.2,2000:151-157.
[16].刘金砺.桩基础设计与计算[M].中国建筑工业出版社,1996,137-167.
[17].刘树亚,刘祖德.嵌岩桩理论研究和设计中的几个问题[J],岩土力学,1999,20(4):86-92.
[18].吕福庆,吴文,姬晓辉.嵌岩桩静载试验结果的研究与讨论[J].岩土力学,1996,17(1):84-96.
[19].吴永福.嵌岩桩静荷载试验结果的研究[J],岩土力学,1996,17(1):84-96.
[20].张问清,赵锡宏等.上海四幢高层建筑箱形基础测试的综合研究.岩土工程学报,1980(1):12-26.
[21].张问清,赵锡宏.逐步扩大子结构法计算高层结构刚度的基本原理.建筑结构学报,1980(4):66-70.
[22].陈志坚,冯兆祥等.江阴大桥摩擦失效嵌岩群桩传力机理的实测研究[J].岩石力学与工程学报,21(6):883-887.
[23].张振国.嵌岩桩试验研究[A],计算机方法在岩土力学及工程中的应用国际学术讨论会论文集[C].武汉:武汉测绘大学出版社,1993,598-602.
[24].明可前,嵌岩桩受力机理分析[J],岩土力学,1998(1):7-10.
[25].杨敏,王树娟等.考虑极限承载力下的桩筏基础相互作用分析[J].岩土工程学报,Vol.20,No.3,1998:82-86.
[26].杨敏,王树娟.桩筏基础相互作用下土中的应立场变化规律[J].岩土工程学报,Vol.21,No.1,1999:26-30.
[27].杨嘉璞.嵌岩灌注桩的轴向承载力[J].岩土工程学报,1984,(02):13-22.
[28].贺少辉,李中林.层状岩体弹塑性本构关系及工程应用研究[J].南方冶金学院学报,1994.Vol.15.No.3:141-148.
[29].重庆建筑地基基础设计规范(GBJ7-89).重庆:重庆建设工程标准办公室,1998.
[30].娄国充.桩式复合地基承载特性研究[J],岩土力学,1998,19(1):77-80.
[31].建筑桩基技术规范(JGJ94-94).北京:中国建筑工业出版社,1995.
[32].徐志英.岩石力学(第三版)[M].南京:中国水利水电出版社,1993.
[33].宰金氓,张问清,赵锡宏.高层空间剪力墙结构与地基共同作用三维问题的双重扩大子结构有限元--有限层分析.建筑结构学报,1983(5):57-70.
[34].铁道部第三勘测设计院.铁路桥涵设计规范(TBJ2-96).北京:中国铁道出版社,1996.
[35].黄求顺.嵌岩桩承载力的试验研究[A].中国建筑学会地基基础学术委员会论文集[C].太原:山西高校联合出版社,1992.
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