桩伴侣(变刚度调平桩)竖向增强体有关负摩阻力、安全度、沉降特性等问题探讨.docVIP

桩伴侣（变刚度调平桩）与竖向增强体有关 安全度、负摩阻力、沉降特性等问题的探讨* 薛江炜1,2，葛忻声1，蔡景珞1,3，杨勇1 (1.太原理工大学建筑工程学院，山西 太原 030024；2.太原市住房与城乡建设委员会，山西 太原； 3. 华北科技学院土木工程系，北京) 摘要：对高大钊教授提出的有关复合桩基安全度问题进行了回答，研究表明复合桩基、变刚度调平设计等技术沿袭常规桩基础的构造，在减小用桩量的同时影响到承载的安全度，给岩土工程师带来了道德风险和执业风险，同时探讨了桩伴侣（变刚度调平桩）上部持力层承载力充分发挥、下部持力层承载力充分保障、统一稳定的整体安全度、相对一致的个别安全系数、“止沉”和后期使用安全系数高的沉降特性，建议业内重视桩伴侣的研究和应用。 关键词：复合桩基；安全度；变刚度调平设计；变刚度调平桩；桩伴侣；个别安全系数；止沉；风险；后期使用 中图分类号：O 319.56 文献标识码：A 文章编号：1000–6915(2006)01–0001–03 THE DISSERTATION ABOUT SAFETY, FRICTIONAL RESISTANCE, SETTLING CHARACTER ON PILE PARTNER (VIRIABLE RIGIDITY PILE) AND ITS VERTICAL REINFORCEMENT XUE Jiang-wei1,2, GE Xin-sheng1, CAI Jingluo1,3, YANG Yong1 (1. College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China; 2. Taiyuan Committee of Housing Municipal and Rural Construction,Taiyuan,China; 3. Department of Civil Engineering, North China Institute of Science and Technology, Beijing, China;) Abstract：In this paper, answered the questions of Professer Gao Dazhao about the safety of composite pile foundation, study revealed that following conventional structure of pile foundation, composite pile foundation and variable rigidity design could cut down on piles but interfere with safety, and bring about moral hazard and practice risk, meanwhile, discussed the pile partner (variable rigidity pile) with its features that bringing out maximum in upper supporting layer potential of bearing capacity, bottom supporting layer providing sufficient security, stable general safety, relativly uniform individual safety coefficient, stop sinking and high later use safety coefficient, and more pile partners are expected. Key words：composite pile foundation; safety; variable rigidity design; variable rigidity pile; pile partner; individual security coefficient; stop sinking; risk; later use 1 引 言 2000年，高大钊教授在《21世纪高层建筑基础工程》一书中发表了《高层建筑桩基础的安全度与可靠性评价》[1]一文。在高教授的文章中，通过对沉降控制复合桩基安全度的分析，指出复合桩基安全度的变化规律，进而提出以下问题： （1）为什么桩先于地基土趋向于极限状态？在