Stability and remote real-time monitoring of the slope slide body in the Luoshan mining area

Landslides have occurred frequently in the Luoshan mining area because of disordered mining.This paper discusses the landforms and physiognomy,hydro-meteorology,formation lithology,and geologic structure of the Luoshan mining area.It also describes the factors influencing the slope stability of landslide No.Ⅲ,determines the general parameters and typical section plane,analyzes the stress-strain state of the No.Ⅲ slope,and calculates its safety factors with FLAC3 D under saturated and natural conditions.Based on a stability analysis,a remote real-time monitoring system was applied to the No.Ⅲ slope,and these monitoring data were collected and analyzed.

Slope stability evaluation and monitoring of a landslide: a case study from NE Turkey

Landslides are quite common natural hazards in the eastern Black Sea region of NE Turkey.Following the heavy rainfall in the K?prülü(Rize)village settlement area,located in this region where the slope debris overlies the agglomerates,a failure occurred.Due to the developed tension cracks and deformations on the ground,houses,tea gardens,and roads were damaged completely.To figure out the causes and mechanism of the sliding and to suggest the precautions,a detailed geotechnical study was carried out.Along the five survey lines,twelve boreholes were drilled with a total depth of 300 meters.Also,the geophysical surveys on ten profiles were conducted and the inclinometer measurements were taken in five boreholes.Undisturbed and disturbed samples were collected and laboratory experiments were performed.Inclinometer measurements indicated that the sliding started in the slope debris and then spread to the agglomeratic bedrock.The slope stability was examined using the limit equilibrium(LE)and finite element(FEM)analysis methods.The results of the slope stability analyses showed that the failure mode is talus slide with composite shape and outputs coincide with the inclinometer monitoring results.Based on the collected data,it is determined that there will be unavoidable engineering problems if no precautions are taken.Because of the negative reasons which make the application of supporting methods meaningless in the study area,it is considered that transferring the residences to a safer place without risk of natural hazards will be economical and reliable.

Investigation on long-term progressive deformation of engineering slope based on comprehensive monitoring

A landslide always results from a progressive process of slope deformation. In recent years, an increasing number of slope instabilities have occurred with regard to human engineering activities such as hydropower or traffic construction in mountainous area, which cause even greater casualties and economic loss compared with the natural hazards. The development of such earth surface process may hold long period with mechanisms still not fully understood. Using monitoring technology is an effective and intuitive approach to assist analyzing the slope deformation process and their driving factors. This study presents an engineering slope excavated during the construction of Changheba Hydropower Station, which is located in the upper reaches of Dadu River, Sichuan Province, southwest China. The engineering slope experienced and featured a five-year continuous deformation which caused continuous high risks to the engineering activities. We conducted in-depth analysis for such a long-term deformation process based on ground and subsurface monitoring data, collected successive data with a series of monitoring equipment such as automated total station, borehole inclinometers and other auxiliary apparatus, and identified the deformation process based on the comprehensive analysis of monitoring data as well as field investigation. After analyzing the effects of engineering activities and natural factors on the continuous deformation, we found that the overburden strata provided deformable mass while the excavation-produced steep terrain initiated the slope deformation in limit equilibrium state over a long period of time;afterwards, the intense rainwater accelerated slope deformation in the rainy season.

Stability analysis of reference station and compensation for monitoring stations in GNSS landslide monitoring

The Real-Time Kinematic(RTK)positioning method of the Global Navigation Satellite System(GNSS)has been widely used for landslide monitoring.The stability of its reference station is crucial to obtain accurate and reliable monitoring results.Unstable reference stations due to the geological environment and human activities are difficult to detect and in practical applications often ignored.As a result,it affects the positioning solutions and subsequently the interpretation and detection of landslide motions,which must be addressed in GNSS landslide monitoring.To solve this problem,we propose using the Precise Point Positioning(PPP)technique to analyze the stability of the reference station by verifying its position.The deformations of the monitoring stations are then compensated.First,the reference station coordinates are obtained by the PPP technique and tectonic motion is considered in data processing.The change or breakout of the reference station position is then determined using a cumulative sum control chart method.Finally,each monitoring station’s displacements are compensated according to the displacements of the reference station.According to the results of the Tengqing landslide experiment,the PPP technique can be used in GNSS landslide monitoring to analyze the stability of reference stations.With PPP,millimeter-level accuracy for the coordinates of reference stations is achieved.Compared to the traditional deformation series,the compensated displacement series more reliably reflects the landslide motions.This study will increase the reliability of monitoring results and contribute to implementing GNSS in monitoring landslides.

基于SBAS-InSAR技术的西南山区滑坡稳定性监测

本文首先利用小基线集时序InSAR(SBAS-InSAR)技术对云南省宣威东北部地表进行形变监测,获取2021年1月至2023年6月的形变结果;然后分析选取的典型滑坡的形变特征,采集了GNSS监测数据与InSAR形变监测进行对比验证;最后分析InSAR形变对降雨的响应。研究结果表明,SBAS-InSAR技术能有效监测西南山区的典型滑坡,该结果可为滑坡灾害的早期识别提供支撑,对于同类型滑坡灾害的稳定性监测具有较高的参考价值。

某高速公路厚层堆积体滑坡处治研究

针对某高速公路边坡厚层堆积体滑坡处治工程,根据补充勘察、室内土工试验、现状滑面参数反算分析等方法确定处治设计参数,通过稳定性计算及剩余下滑力计算分析,采用“抗滑桩+Φ108mm钢管桩+深层排水孔”的综合支挡及排水方案,并进行地表位移监控量测。经处治后边坡天然及暴雨工况下稳定性分析安全系数满足规范要求,现场防护工程实施完毕后地表位移处于基本稳定状态。

某隧道-多滑面滑坡斜交体系稳定性及综合处治技术研究

以某高速公路隧道为研究对象,借助物探、钻探、监测等手段研究了该隧道-多滑面滑坡斜交体系稳定性及综合处治技术。研究结果表明:该滑坡存在3个滑面,第2滑面稳定性最低,为主滑面,暴雨工况下该滑面处于失稳状态;对于正在变形的隧道-多滑面滑坡斜交体系,提出了分区、分期治理,在监测的基础上先采取应急工程,且应急工程与永久工程、洞内与洞外处治相结合的综合防治思路。监测数据表明,该隧道-多滑面滑坡斜交体系通过坡脚反压、钢管群桩、抗滑桩、提高衬砌支护强度及洞内反压、护拱等综合措施处治后,坡体及结构均处于安全状态。

基于S-SAR边坡雷达的滑坡形变监测分析研究

露天矿山边坡安全是矿山安全的保障,边坡表面变形监测数据分析有助于获得准确的滑坡时间预测,因此,滑坡形变监测分析研究是研究的重点。本文对比分析了两个矿山滑坡时的合成孔径边坡雷达变形监测数据,获得了在滑坡时边坡表面变形监测特征曲线,进而建立了变形特征曲线与滑坡之间的关系。通过分析发现了边坡在发生破坏性变形之前会有多次异常的加速变形现象,这一点与斋藤法的三阶段变形相符。边坡在滑坡前并不会呈加速—匀速—再加速的变形规律,而是会重复多次加速—匀速—加速循环的变形现象。

降雨入渗对滑坡稳定性的影响研究

福建省是台风暴雨诱发产生突发性地质灾害的频发区,为研究降雨入渗对台风暴雨型滑坡稳定性的影响,以永泰县洑口乡后亭村滑坡体为例,采用GeoStudio软件建立滑坡体饱和-非饱和渗流数值模型,分析降雨过程中滑坡体孔隙水压力等值线和稳定系数的变化,并对滑坡体监测数据进行分析。研究结果表明:强降雨时,在弱透水性地层会出现短时间的滞水现象,导致地下水位上升,对坡体稳定性产生不利影响;强降雨会使滑坡安全系数快速降低;在一个干湿循环后滑坡安全系数降低0.1,在多个降雨周期后,安全系数有可能低于1.0。实测滑坡月累计位移量较小,坡体目前相对稳定,但地表位移总体呈现稳步增长的趋势,后续应加强监测。

高路堤边坡稳定性分析及滑坡综合治理研究

为减少高路堤边坡失稳对周边人民生命和财产安全的影响,以长三角地区某降雨型滑坡为研究对象,通过多源数据分析其成因和治理前稳定性,并据此展开滑坡综合治理工作,采用数值模拟和信息化监测对治理后边坡进行稳定性分析。结果表明:人类活动和强降雨是导致滑坡的主要原因;削坡减载和加锚杆等综合治理措施大大提高了边坡稳定性,使其在天然环境和暴雨环境下均处于稳定状态;信息化监测数据显示治理后边坡整体处于稳定状态,雨季边坡存在一定波动,必须加强该阶段变形监测预警工作。

基于监测数据云模型的滑坡安全稳定性评价

滑坡是公路地质灾害的主要表现形式之一,严重影响着沿线居民的出行及人居安全。随着北斗等监测技术的发展,滑坡监测预警已成为地质灾害防范的重要手段。但在监测与安全稳定性评价方面依然存在诸多的技术问题。本文首先介绍了云模型的原理,构建了监测云模型,通过应用案例进行验证,结果表明监测云模型可以准确地对滑坡体进行安全稳定性评价。

基于排水固结效应的古滑坡稳定性增长分析

京珠高速公路湘境K244滑坡是在雨季开挖路堑诱发巨型古滑坡复活形成的大型土质公路滑坡,滑坡形成的外因是公路路堑开挖和降雨入渗,内因是古滑坡存在连续贯通的滑动带及承压性的地下水。公路滑坡经过排水及抗滑支挡治理后趋于稳定,支挡结构中锚索预应力缓慢衰减。基于公路滑坡和古滑坡滑带土共同的排水固结强度再生机理,提出滑带土再生强度参数的多断面及分层反算法,计算得水上强度参数大于水下强度参数,强度分层特征明显;公路滑坡经排水廊道降水多年后,露出水面的滑带土强度参数增长明显,由此可计算公路滑坡治理后的长期稳定系数;考虑滑带土排水固结强度再生的滑坡推力减小,大致符合锚索长期监测的预应力损失规律;滑坡在治稳后,廊道排水促进滑坡稳定性增长是持续缓慢的过程,符合滑带土强度再生特征。

大型黄土古滑坡蠕变特性模拟

为研究黄土古滑坡蠕变效应下长期稳定性问题,依托支党河特大桥桥区的黄土古滑坡,以原状黄土剪切蠕变试验为基础,采用数值模拟方法,分析削方卸载前后古滑坡体蠕变至2,10,30 a及100 a时的位移场及塑性区分布特征,对削方卸载后的古滑坡坡体进行现场监测,并与数值模拟结果进行对比。结果表明:随剪应力增加,原状黄土蠕变速率先减小后增大,先后经历衰减蠕变、等速蠕变及加速蠕变3个阶段,剪应力长期作用下,黏聚力及内摩擦角分别下降了16%,32%,蠕变效应明显;古滑坡坡体在10~100 a间出现了加速蠕变过程,位移量最大达到1.96 m,蠕变至30 a塑性区基本贯通,发生失稳破坏;在坡体大倾角位置削方卸载后,塑性区面积显著减小,蠕变10 a后,塑性区基本稳定且并未贯通,最大位移量仅为0.65 m,蠕变至100 a坡体也未发生失稳破坏。古滑坡表面及深部位移现场监测数据与数值模拟计算结果较为吻合,验证了蠕变试验及数值模拟结果的可靠性。

永善县城古滑坡复活变形特征及稳定性分析

永善县城所处单斜斜坡整个为一古滑坡堆积体,位于金沙江南部。自1979年开始至今,古滑坡东部H1、H2滑坡分别发生复活变形,严重威胁复活滑坡上部永善县城3.5万余人生命财产安全。本次研究采用地面调查、地表与地下位移监测以及数值模拟等方法,分析了永善县城东部滑坡的复活变形特征与不同工况下复活滑坡稳定性的变化特征。结果表明:永善县城古滑坡深层特大型滑坡,现阶段复活的H1滑坡变形迹象明显,其中以北东侧变形最为剧烈,平均水平位移速率达0.63 mm/d, H1整体处于加速变形阶段;H2滑坡处于蠕动变形阶段,后缘局部发育小型拉张裂缝。复活滑坡存在3个滑动面:H1滑坡第一剪出口、H1滑坡第二剪出口、H2滑坡,通过极限平衡法中的M-P法与Spencer法对不同工况下滑坡的稳定性进行分析与评价,得出数值模拟的稳定性特征与监测变形特征基本一致,暴雨对滑坡复活变形的影响最大、地震次之,因此后期治理需要充分考虑分区域治理与截排水的问题。

公路边坡空天地孔一体化监测平台架构与工程应用

随着云计算、大数据、物联网和星地互联科技的快速发展,本文提出公路边坡空天地孔一体化监测平台系统架构,阐述了该平台的基本组成与系统功能。基于该一体化平台对福安西互通连接线公路工程六级高边坡和高填方进行实际应用,结果表明六级高边坡变形在水平和高程方向均稳定(±2mm),未见整体滑移发展趋势。高填方路基最大相对不均匀沉降约4mm,土体深层最大水平位移小于5mm,高填方路基也未发生整体滑移失稳风险。说明该一体化监测平台具有“一张图+多源立体管控”的优势,可实现公路边坡风险管控的集成化、数字化、网络化和智能化目标。

持续降雨下阳高山滑坡变形机理与稳定性分析

为了探究雨量对中小型土质滑坡变形破坏机理及稳定性影响,选取玉山县阳高山滑坡为研究对象。通过对其2022—2023年期间重点时间段的地表位移、土压力、土壤含水率监测数据进行关联分析,确定其与降雨量之间的响应关系,分析其在不同降雨时期的变形趋势,探讨了阳高山滑坡的变形机理,并运用GeoStudio二维数值软件探究降雨强度与安全系数之间的关系。研究表明,独特的地质结构与人工切坡为滑坡的发育提供潜在条件,而降雨是阳高山滑坡产生的主要诱因;当降雨强度为10 mm/d,长时间降雨对滑坡稳定性影响不大;当降雨强度为20 mm/d时,在长时间降雨作用下,滑坡安全系数下降3%,滑坡仍处于稳定状态;当降雨强度为30 mm/d时,在长时间降雨作用下,滑坡安全系数下降12%,滑坡处于欠稳定状态;当降雨强度为40 mm/d时,在长时间降雨作用下,滑坡安全系数下降30%,滑坡处于失稳状态。

雷达预警系统在猫儿沟露天矿的应用

为了实时监测猫儿沟露天矿北外排土场边坡岩体动态变形情况及沉降数据,建立了MSR400边坡雷达监测预警系统,介绍了该监测系统的原理、优势和实例应用,并根据雷达数据分析和计算结果,给出应对措施。结果表明:此监测系统能够有效获取沉降的变形数据,并且能够起到预警的作用,对边坡稳定性分析提供技术支持。

G70线福银高速某处山体滑坡整治工程施工方案研究

文章以G70线福银高速某处山体滑坡整治工程为依托,基于工程概况分析滑坡成因,并对滑坡稳定性进行分析,发现需设置支挡设施对滑坡进行加固,然后从施工安全性、快捷性和工程经济性等方面对滑坡整治方案进行比选,确定了采用圆形抗滑桩为主的方案对该处滑坡进行治理,并对滑坡工程的施工注意事项进行总结,以期为相似地层条件的滑坡整治工程提供经验。

滑坡预报与有限元实例分析对比研究

为对滑坡的分析预报工作总结一套行之有效的方法,以三峡库区内滑坡Ⅰ为例展开研究。采用基于有限元原理的ABAQUS软件及摩尔库伦本构模型,建立三维地质模型并进行各工况下数值模拟计算。运用MATLAB自编程序滑坡预测集成系统对滑坡既有监测数据进行分析与预测。最后,将数值模拟计算结果、实际监测数据及预测结果进行对比分析,结果显示该分析预报方法具有较好的可靠性和实用性。对滑坡稳定性及流固耦合分析具有积极作用,对滑坡预测及其他领域的预测预报研究也具有广泛的参考意义。

基于PFDGM(1,1)-AR模型的老滑坡变形预测研究

为有效掌握老滑坡复活机理及其变形规律,以某变质岩区顺层老滑坡为工程背景,结合变形监测结果,开展其变形规律分析及变形预测研究。分析结果表明,老滑坡复活体的变形特征显著,尤其以复活体中部变形更为突出,并经变形预测,得出复活体的累计变形仍会进一步增加,其稳定性趋于减弱,其中,中部的变形无收敛趋势,即增加速率仍趋于增大,其稳定性减弱程度相对更大,对其开展防治必要性显著。