【作者】 蒋楚生；

【导师】 周德培；

【作者基本信息】 西南交通大学 ， 岩土工程， 2006， 博士

【摘要】 预应力锚索桩板墙是近二十年来应用于陡坡高路堤的一种轻型支挡结构，至今已在岩土工程领域获得较快发展，并显示了其安全可靠，经济适用等特点，越来越被广大工程技术人员所接受，并成功应用于多处铁路、公路以及其它支挡工程中。但到目前为止，仍然没有公认且成熟的设计计算方法，包括结构的内力计算、土压力分布与大小、锚索-桩-填土相互作用机理、合理的施工技术等一系列基础理论和施工工艺问题都没有得到较好解决，理论研究远远滞后于工程应用。本文以国际大通道昆明至曼谷某高速公路一处高路堤锚索桩板墙试验工程作为试验工点，通过现场全面的测试工作，对作用于桩、板上的土压力采用了土压力盒、测力计、钢筋应力计等多种方法进行了测试，同时对桩、板的钢筋应力进行了测试，对锚索预应力进行了观测，还采用测斜仪与全站仪对桩身位移进行了观测，获得了大量详实的测试资料。本文在对现场测试资料进行分析、归纳、提炼的基础上，升华到理论上，在以下诸多方面取得了较大进展，本论文的研究成果为尽快建立设计和施工规范提供了充实的技术资料和科学依据。 采用条带极限平衡理论，对路堤填方粘性土土压力计算方法进行了探讨。 采用块体极限平衡理论，根据摩擦加筋原理，对土工格栅减小高路堤填方支挡结构物上的土压力的原理进行了详细探讨，提出了相应的公式。并对加设土工格栅后填料强度的提高采用了“准粘聚力”概念来模拟，并提出了相应的计算公式。 利用极限平衡理论，对路肩式(预应力锚索)桩板墙是否按“土拱效应”的土压力进行设计作了探讨，认为对于该类结构，是不能按“土拱效应”的土压力进行设计的，否则由于板上土压力太小，是十分危险的。 对各种边界条件及地面汽车荷载作用下的土压力计算方法进行了归类，后者以按弹性理论方法确定为妥。 利用变形协调条件，对埋深相对较大的预应力锚索桩板墙及埋深相对较浅的柱-锚-板结构物的设计计算方法进行了详细探讨，提出了相应的计算公式，并提出了锚索预应力的确定方法及桩、板结构的设计计算方法。 以现场试验为基础，研究了采用二次劈裂注浆技术提高软弱地层中锚索承载力的方法，提出了相应的计算公式，研究出了一种二次劈裂注浆锚索结构型式，总结并提出了一套具有可操作性的施工工艺。 以科研试验工程为依托，对桩、板的受力与变形进行了全方位的测试和分更多还原

【Abstract】 The prestressed cable anchor-pile sheet wall is a light retaining structure which was widely used in the past twenty years for on-steep slope and high embankment protection and is rapidly developing at present in the geotechnical engineering realm. As this structure is featured with safety, reliability, less construction cost and applicability, it has been successfully adopted in the railway, highway and other engineering works by more and more engineering technicians. However, its design calculation method are not set up, and a series of fundamental theory and construction technology, including structural internal forces calculation, earth pressure distribution dimensions, interaction mechanism of the cable anchor-pile-slab-soil fill, the reasonable construction technology is not solved completely, its theoretical research lags behind its applications greatly. The experiment site of the prestressed cable anchor-pile sheet wall lies in the on-steep slope-high embankment section of the KunMing-BangKok highway international passage. The overall test were made there by means of various methods, such as using the soil pressure cell, pressure gauge and steel bar stress detector, etc., for testing the earth pressure acted on the pile sheet, simultaneously for testing the stress of steel bar in the pile sheet, for observing the prestresses of the cable anchor, and using the inclinatorium and GPS totalstation for observing the displacement of the piles and a great number of detailed testing data are acquired. Then the site testing data are analyzed, summarized and abstracted and theoretical research has been performed as followers, which can be used for reference of establishing the specifications of scientific design and construction technology as quickly as possible.A discussion has been performed on the calculation method of earth pressure of cohesive soil on an embankment retaining structure using the strip and band limit equilibrium theory.Some corresponding formula has been put forward after the principles of the geo-grids reducing earth pressure on a high embankment retaining structure are discussed in detail according to the friction principle of reinforcement using the更多还原