对计算复合土钉支护整体稳定性的圆弧滑动法的改进

对计算复合土钉支护整体稳定性的圆弧滑动法进行的改进，一是考虑到滑裂面不再是一个完整的圆弧，滑动区和坑底的圆弧不具有相同的圆心和半径；二是考虑到基坑土层初始应力的影响。根据该思想计算了大量实例，并且将其与未改进的方法做比较，得出使用改进方法的稳定系数下限值。     

Seismic behaviour of flexible retaining systems subjected to short-duration moderately strong excitation

Using finite-element modelling, this paper explores the magnitude and distribution of dynamic earth pressures on several types of flexible retaining systems: L-shaped reinforced-concrete walls, piled walls with horizontal or with strongly inclined anchors, and reinforced-soil walls. The utilized base excitation is typical of earthquake motions of either high or moderately low dominant frequencies having a peak ground acceleration (PGA) of 0.40 g and relatively short duration. Linear as well as non-linear (Mohr–Coulomb) soil behaviour is investigated, under dry conditions. The results show that, as the degree of realism in the analysis increases, we can explain the frequently observed satisfactory performance of such retaining systems during strong seismic shaking.     

Computer aided design of geosynthetic reinforced soil walls

Summary The computer aided design of geosynthetic reinforced soil walls is reported. The magnitude of tensile forces in the geosynthetic reinforcement has also been studied under external vertical and horizontal strip loads.     

Controlling the safety of geotechnical structures: a proposed approach

Summary This paper considers the safety of geotechnical structures using various design philosophies which include the global safety method and a number of limit state design methods. The methods are considered individually and their treatment of uncertainties of design briefly discussed in terms of parameter and system uncertainty. Each method is not designed to produce a definitive measure of safety, but should be viewed as an aid in the process of controlling or managing safety. Crucial to all design methods is the idea of a design parameter. However, in certain instances it is often not clear whether a design parameter should be an upper or lower bound on its possible value. A proposed limit state design method for overcoming this problem is outlined, based on putting bounds on parameters. An example of a reinforced concrete cantilever retaining wall is used to demonstrate its advantages over current methods. The proposed method offers a more rational approach to the design of retaining structures.     

常用硅酸盐水泥护壁堵漏实践与探讨

水泥浆护壁堵漏是钻探施工对付复杂地层的有效方法之一。常用硅酸盐水泥通过外加剂改性可以获得与多种特种水泥同性能的水泥浆液。因而合理使用外加剂可以使常用普通水泥在现场处理复杂地层时代替特种水泥,取得良好的技术、经济效益。     

ANSYS在边坡锚喷支护工程中的应用

预应力锚杆支护技术广泛应用于边坡工程,但预应力锚杆的作用机理还缺乏系统深人的研究。通过利用ANSYS提供的非线性弹塑性模型,结合一边坡锚喷支护工程实例,采用基于摩尔-库伦等面积屈服准则的强度理论,对边坡支护前后的稳定性进行分析,对锚固件和边坡岩土体的相互作用进行数值模拟,得出一些有益的结论,对边坡锚喷支护工程优化设计具有一定的指导意义。     

深圳轨道交通建设中的若干岩土工程问题

通过深圳轨道交通建设多年的具体实践,对该地区轨道交通（地铁）建设中涉及到的勘察、基坑支护、盾构施工等方面的岩土工程问题进行了总结,包括有关技术要点、适用工法、解决方案、经验教训和大量具体事例。     

连拱式组合拱结构在深基坑工程中的应用

钻孔灌注桩连拱式组合拱结构是由大直径的钢筋混凝土钻孔灌注桩（拱脚支持桩）和小直径钻孔灌注桩排列呈拱型组合成一个组合截面,将水土压力产生的弯矩和剪力转化为沿拱轴方向的轴向压力,不仅受力合理,而且,有更好的截面效能,刚度和强度也比相同质量的桩（墙）式结构大得多,顶部用钢筋混凝土圈梁连接成整体,在不加撑锚条件下比桩墙式结构能支护更深的基坑,如开挖深度较大,可沿深度方向适当距离增加钢筋混凝土加劲肋,是一种新的支护结构型式,经济效益非常显著。通过在南京某大厦深基坑支护中的应用和土体开挖过程中,对其侧向土压力、桩身应力、支护结构的侧向位移及外侧土体的变形的实测研究,获得了连拱支护结构在软土地区受力和变形的基本规律。     

圆形支护结构的拱效应等效支撑计算方法

从弹性力学中圆筒受均布荷载的解出发,把圆形支护结构作为弹性地基梁,把圆形支护结构的拱效应作为支护结构的等效支撑作用在弹性地基梁上,从而得出了一个计算圆形支护结构内力和位移的拱效应等效支撑方法。工程实例的计算表明,该方法是实用而有效的。     

不同支护结构的桩身应力及其分析

钻孔灌注桩悬臂支护结构和单层支点混合支护结构是常用的深基坑支护结构型式,钻孔灌注桩连拱式组合拱结构是一种新型的支护结构型式。通过对南京某大厦深基坑开挖过程中,桩身应力的实测研究和对比分析,获得了在相同的工程水文地质、施工和降水条件下,3种不同支护结构的受力主筋在不同深度的应力大小及其分布形态,为设计计算和钻孔灌注桩连拱式组合拱结构的推广应用积累了宝贵资料。