探讨抗滑桩在滑坡治理工程中的应用实践

综合论述了抗滑桩的类型,优点及破坏形式,对目前抗滑桩在滑坡治理中存在的问题进行了简要介绍,分析了滑坡产生的原因和抗滑桩设计上的缺陷,并阐释了抗滑桩的设计和施工措施,以供借鉴参考。     

矿山岩土工程施工中抗滑桩支护加固技术分析

针对矿山岩土工程施工中抗滑桩支护加固技术展开探讨,从滑坡影响因素和防治措施入手,明确了抗滑桩类型以及应用效果要求,采用案例分析法,有针对性地提出了抗滑桩治理方案,最后,总结了实际应用中存在的主要问题,并提出了相应保障对策。根据研究结果可知,抗滑桩支护加固技术有着较好的抗滑效果,实际应用过程中应加强对于滑坡因素的分析,采取有效保障措施,以此确保施工安全。     

河北省宽城县遵(化)—小(寺沟)铁路某滑坡治理措施研究

河北省宽城县遵(化)-小(寺沟)铁路穿越一个体积约77×104m3的古滑坡体,因在滑坡前缘以路堑方式穿过,开挖施工导致古滑坡复活.为保障未来铁路的运营安全,需要对其进行彻底治理.在现场地质调查及试验,以及分别对沿复活滑坡体新滑面和古滑面在不同工况下的稳定性计算的基础上,结合复活滑坡体的具体特征,提出2种治理方案,即"抗滑桩"方案和"削方+抗滑桩+桩间挡土墙"方案.通过综合比选确定后者为采用方案,并具体进行了削方、抗滑桩、截排水系统和坡面防护等设计.     

锚拉抗滑桩在某矿山滑坡治理中的设计应用

以某矿山厂区内道路滑坡为例,在收集了大量水文地质资料的基础下,对滑坡在两种不同工况下进行了下滑力计算。经过方案必选,确定了锚拉抗滑桩治理滑坡的方案,并叙述了设计的主要思路和具体设计方案。监测结果表明,本工程锚拉抗滑桩设计有效控制了滑坡变形,可供同类工程借鉴。     

露天矿边坡支护抗滑桩桩间距计算及工程实践

作为一种常用的支护方式,抗滑桩在露天矿滑坡治理中发挥着巨大的作用。抗滑桩设计的重要指标之一就是桩间距,在以往的研究成果中并没有完整的确定桩间距的理论和方法。通过对抗滑桩桩间土拱效应的研究,从桩侧与边坡土体间的摩擦阻力及黏着力承担滑坡推力的静力平衡条件和土拱拱脚处与跨中截面的强度条件2个方面进行分析,建立了桩间距的计算公式。工程实践表明,所建立的抗滑桩间距计算公式的计算结果较为合理,对于露天开采边坡加固工程具有一定的实用价值。     

抗滑桩在矿山边坡滑坡整治工程中的应用

随着我国经济的快速发展,国家越来越重视矿山边坡滑坡整治工程。为了进一步的了解抗滑桩的应用治理效果,必须要根据现阶段的矿山开采情况,结合抗滑桩的特点开展施工工作。矿山边坡在地质学上本身就具备不稳定性,由于受到地质学上的重力影响,各种自然因素以及人为因素的影响,比较弱的表面(带),就会出现缓慢以及周期性的滑动变形,有时候甚至会出现剧烈的下降,即属于滑坡地质灾害,这种现象不仅对建筑工作本身造成影响,也会影响人们的生活以及财产安全,因此评估以及预测斜坡的具体稳定性,防止以及管理它们是非常重要的。本文主要针对现阶段的抗滑桩在矿山边坡滑坡整治工程中的应用进行简要分析,并提出合理化建议。     

广西龙胜县某滑坡稳定性分析与治理研究

根据龙胜县某滑坡勘察、设计资料为基础,结合现场调查,对滑坡地质环境、滑动原因及稳定性进行综合分析。根据现场地貌形态的特征、滑坡变形形态、结构面等分析,推断出滑坡的滑动面,选取三条典型的滑动剖面,计算出滑坡典型断面稳定系数。提出采用预应力锚索、抗滑桩、挡土墙相结合的防治方案,具有较高的实践和理论意义。治理后经监测,滑坡处于稳定状态,表明该滑坡采用综合处治技术完全达到了预期效果,治理效果良好。     

圆形截面抗滑桩在某滑坡治理中的应用

以浙江安吉某公路滑坡为例,通过对地质资料的研究,剖析了滑坡的成因,介绍了圆形截面抗滑桩的设计方法,取得了较好的治理效果,对今后类似工程施工有一定的参考和指导意义。     

蔗头山山体滑坡影响因素分析及工程治理

分析了地质构造、降雨对滑坡的控制和影响作用,提出了减载与抗滑桩支挡的综合治理方案,经过10余年的观察监测,治理效果良好。     

某工业区山体滑坡稳定性分析及工程治理

根据西乡固戍第三工业区山体滑坡区域地质条件和边坡体的基本特征,分析诱发滑坡的主要原因,并对滑坡体稳定性进行定性分析。通过反演计算,确定饱和状态下滑动面强度参数,利用传递系数法对滑坡进行稳定性评价和剩余推力计算;根据计算结果,采用削坡减载、抗滑桩、预应力锚索、锚索(杆)格构梁等措施对边坡进行综合治理。监测结果表明,在后期连续强降雨情况下,滑坡体变形稳定,治理效果良好。     

粉喷桩加土工格栅复合地基处理施工技术浅析

本文介绍了粉喷桩加土工格栅复合地基加固机理 ,提出了粉喷桩加土工格栅的施工方法及施工中常见问题的解决办法。     

直螺纹钢筋连接技术在某高架桥工程中的应用

南昌市某高架桥工程中钻孔灌注桩及墩柱钢筋连接采用直螺纹连接技术，接头质量稳定，大大加快了施工进度，节约了钢材，获得了良好的经济、社会效益。本文介绍了其工艺原理、工艺流程以及操作要点。     

30MnSi管桩钢筋镦头开裂原因浅析

从盘条和管桩生产工艺等方面，分析30MnSi管桩钢筋镦头开裂的原因，认为除传统上的钢筋热处理和盘条钢质两类影响因素外，表面划伤和折叠等线状缺陷也会造成镦头开裂，对比作重点分析。     

Behavior of Pile Groups Subject to Excavation-Induced Soil Movement in Very Soft Clay

A series of centrifuge model tests was conducted to investigate the behavior of pile groups of various sizes and configurations behind a retaining wall in very soft clay. With a 1.2-m excavation in front of the wall, which may simulate the initial stage of an excavation prior to strutting, the test results reveal that the induced bending moment on an individual pile in a free-head pile group is always smaller than that on a corresponding single pile located at the same distance behind the wall. This is attributed to the shadowing and reinforcing effects of other piles within the group. The degree of shadowing experienced by a pile depends on its relative position in the pile group. With a capped-head pile group, the individual piles are forced to interact in unison though subjected to different magnitudes of soil movement. Thus, despite being subjected to a larger soil movement, the induced bending moment on the front piles is moderated by the rear piles through the pile cap. A finite element program developed at the National University of Singapore is employed to back-analyze the centrifuge test data. The program gives a reasonably good prediction of the induced pile bending moments provided an appropriate modification factor is applied for the free-field soil movement and the amount of restraint provided by the pile cap is properly accounted for. The modification factor applied to the free-field soil movement accounts the reinforcing effect of the piles on the soil movement.     

钢渣桩在某钢厂办公楼地基处理中的应用

介绍了钢渣桩的特点,并从化学反应、离子交换和凝硬反应等方面论述了钢渣桩加固软土地基的机理,阐述了某钢厂厂区软土地基采用钢渣桩处理的设计计算;从地基加固处理中的布桩形式、桩长、复合地基承载力估算等角度对加固措施进行了设计和验算。结果表明,厂区软土地基经处理后承载力得到显著提高,地基沉降明显改善,加固效果显著。     

钻孔灌注桩施工中常见的质量事故及防范措施要点

钻孔灌注桩是工程中常用的深基础形式,其成桩质量对工程安全有着至关重要的作用.本文简要分析钻孔灌注桩施工过程中常见的几种质量问题以及相应的防范措施,为钻孔灌注桩工程施工人员提供借鉴.     

Behavior of Slender Piles Subject to Free-Field Lateral Soil Movement

Soil movements associated with slope instability induce shear forces and bending moments in stabilizing piles that vary with the buildup of passive pile resistance. For such free-field lateral soil movements, stress development along the pile element is a function of the relative displacement between the soil and the pile. To investigate the effects of relative soil-pile displacement on pile response, large-scale load tests were performed on relatively slender, drilled, composite pile elements (cementitious grout with centered steel reinforcing bar). The piles were installed through a shear box into stable soil and then loaded by lateral translation of the shear box. The load tests included two pile diameters (nominal 115 and 178?mm) and three cohesive soil types (loess, glacial till, and weathered shale). Instrumentation indicated the relative soil-pile displacements and the pile response to the loads that developed along the piles. Using the experimental results, an analysis approach was evaluated using soil p-y curves derived from laboratory undrained shear strength tests. The test piles and analyses helped characterize behavioral stages of the composite pile elements at loads up to pile section failure and also provided a unique dataset to evaluate the lateral response analysis method for its applicability to slender piles.     

Productivity and Cost Regression Models for Pile Construction

The estimating process of pile construction productivity and cost is intricated because of several factors: unseen subsurface obstacles; lack of contractor experience; site planning; and pile equipment maintainability. This study intends to assess cycle time, productivity, and cost for pile construction considering the effect of the above factors using regression technique. Data were collected through designated questionnaires, site interviews, and telephone calls to experts in different construction companies. Many variables have been considered in the pile construction process. Seven regression linear models have been designed and validated to assess productivity, cycle time, and cost. Consequently, three sets of charts have been developed based upon the validated models to provide the decision maker with a solid planning, scheduling, and control tool for pile construction projects. This research is relevant to both industry practitioners and researchers. It provides sets of charts and models for practitioners’ usage to schedule and price out pile construction projects. In addition, it provides the researchers with the methodology of designating regression models for the pile construction process, its limitations, and future suggestions.     

载体桩在西部铜材铜电解工程中的应用

本文结合工程实例介绍了载体桩基础方案的确定、施工工艺、质量控制要点与桩基检测效果,表明载体桩具有单桩承载力高、造价低、沉降量小、施工简便等特点,在地基处理与基础设计中具有明显的经济优势和良好的应用前景。     

地质工程施工中串桩产生的原因

针对地质工程施工中的串桩现象,分析了形成串桩的原因,以引起设计及施工单位重视,提高施工质量。