预应力锚索+抗滑桩在滑坡治理中的应用

在对南三路一虎陇山段滑坡进行稳定性分析与评价的基础上,通过对滑坡治理方案选型分析,提出预应力锚索+抗滑桩是一种在坡高较大且场地紧张等不利情况下进行滑坡治理的有效措施.同时,扼要介绍了预应力锚索+抗滑桩施工步骤.     

花岗岩地区滑坡特征及防治对策——以湖南省平江县花岗岩滑坡为例

文章分析了湖南平江县花岗岩地区滑坡,在地形地貌、地层岩性、地质构造、水文地质条件、滑坡体、滑动面、滑动多期性等方面的典型特征。由于地表水和地下水是花岗岩地区滑坡中的主要影响要素,因此,提出对该类型滑坡应采用排水工程为主,并和其它防治措施相结合的方法进行防治。换言之,排水工程是滑坡防治中单独的一项措施,其效果应在同步进行的滑坡监测中予以验证。在滑坡治理的过程中,滑坡监测始终是滑坡防治的基础,防治的效果也需要监测工作来检验。     

玉树县结古镇某水电站滑坡成因分析及治理探讨

首先根据滑坡病害段的地形地貌、地层岩性和变形活动等特征,对滑坡的形成机制进行了分析,其次对其滑带土的物力力学参数及以及滑坡的稳定性进行了评价,最后根据滑坡机理及稳定性提出了截排水、抗滑桩支挡和锚索框架加固等综合治理措施,可为类似工程治理提供借鉴。     

长沙市望城区丁字镇船行湾山滑坡稳定性评价及工程治理研究

随着国家社会经济发展,国家对滑坡地质灾害治理越来越重视。滑坡稳定性评价和工程治理方法也进一步发展,本文列举了常用的滑坡稳定性评价和工程治理方法,并以船行湾山滑坡治理为例,采用瑞典条分法对滑坡进行稳定性评价及滑坡推力计算,并采用坡面排水、挡土墙结合锚杆格构梁对滑坡进行综合治理,达到了消除滑坡隐患,改善人居环境的治理效果。     

日照市莒县南涧村滑坡地质灾害稳定性评价及治理方法

通过对日照市莒县南涧村滑坡体地质灾害的稳定性分析评价计算,探讨分析了该处地质灾害的特征及现状特点,并就南涧滑坡地质灾害的治理方案进行了初步分析探讨,为日照市滑坡地质灾害的防治提供了理论基础资料。     

四川省石棉县科落头滑坡形成机理与治理

由自然产生和人类活动引发的滑坡灾害在世界范围内都较普遍,其对人民的生命和财产安全构成了严重威胁,急需对其进行治理。以四川省石棉县新民乡科落头滑坡为例,在分析滑坡形成机理的基础上,进行了设计与施工探讨,为同类滑坡治理提供借鉴。     

广西平南县地质灾害特征及防治措施

平南县地质环境脆弱,以山区、丘陵地形地貌为主,地质构造及岩溶发育,人类工程活动强度较大,易产生滑坡、崩塌、地面塌陷等地质灾害,其中以滑坡、崩塌为主.文章通过对该区主要地质灾害进行系统的野外调查、统计和分析研究,总结了各种地质灾害的发育特点和分布特征,提出了减灾防灾措施.     

玉树结古镇结古寺滑坡综合分析研究

以受玉树"4·14"地震影响的结古镇结古寺滑坡为例,根据滑坡地质背景和基本特征,详细分析了控制滑坡变形的影响因素。并运用工程实践对桩板墙工程开挖的所揭露的滑体、滑带、滑床特征进行了对比分析,验证了前期勘查、物探解译成果,分析了动态信息法施工在本工程的应用,总结了在震后特殊环境条件下进行悬壁式桩板墙施工工艺经验。通过施工期、试运行期监测和工程质量检测,对治理效果进行了初步评价,桩板墙工程对该滑坡治理有效,目前滑坡处于稳定状态,保障了坡顶和坡脚建筑物安全,为今后该类滑坡治理工程提供了借鉴。     

香丽高速公路昌格洛滑坡-隧道工程病害三维数值分析

准确评价滑坡-隧道相互作用及稳定性, 采用合理的病害防治方法, 对保障公路顺利完工具有重要意义。以香丽高速公路昌格洛滑坡为例, 利用现场地质调查、钻探等方法查明了滑坡成因机制以及变形特性, 通过数值模拟研究了昌格洛滑坡在天然、降雨和开挖等工况下的空间应力应变特征以及稳定性变化, 研究了隧道与所穿越滑坡之间的相互作用, 据此提出了相应的病害防治方案。结果表明: 昌格洛滑坡在自然条件下处于欠稳定状态; 隧道开挖难以引起滑坡整体失稳, 但会诱发滑坡局部变形, 受滑坡体变形影响, 穿越滑体的隧道部分将产生拉伸-剪切变形; 降雨严重恶化滑坡稳定性, 导致滑坡失稳, 进而使穿越其中的隧道失效破坏。原选线方案面临风险巨大, 最优防治方案为线路东移绕避, 使隧道从滑面以下穿过。研究方法和成果可为香丽高速公路类似病害的防治提供有益借鉴。      

浅析耒阳市的崩塌与滑坡

崩塌与滑坡.是耒阳市的主要地质灾害类型,通过对其发育特征及成生因素的初步探讨,分析并提出了该市崩塌与滑坡的差异性和共同点,针对具体事例论证了以暴雨为主要诱发因素导致的崩滑现象具有明显的阶段性和复活性,提出了今后有效治理崩滑的防治措施和建议,可供地方防灾减灾借鉴参考.     

Stability analysis and treatment of No.2 dump of Nanfen iron mine

On the basis of the study on the engineering geological characteristics of No.2 dump of Nanfen iron mine and the analysis of the failure mode of dump landslide, the stability of the present dump, the stability of the dump 20 years later and the stability of double-bench dump are analyzed. Then, the debris flow risk is evaluated by fuzzy mathematics method. Finally, the comprehensive treatment for the dump is suggested. It is concluded that ① In rainy and snowmelt period, the stability would be decreasing sharply when ground water is not drained out in time; ② Double-bench dumping mode will improve stability of the dump little; ③ Debris flow risk is middle danger. The interim debris flow with medium scale may occur. ④ Monitoring, draining and baffling work ought to be well done. ⑤ In order to prevent the damage of landslide and debris flow, three measures are adopted, including setting rockfall net, setting the debris flow barrier and removing the residents.     

滑坡治理中格构式锚杆框架结构设计

结合略阳县城狮子山滑坡的治理，讨论了格构式锚杆框架结构治理松散堆积体滑坡设计的全过程。根据防治区的工程地质情况和相应的规范要求，确定了防治工程的安全等级。利用格构式锚杆框架结构所采用的小间距、小吨位锚杆及连续格构梁柱．从而使格构梁柱受力较均匀，适合松散堆积体滑坡治理的需要，即同时满足深层抗滑和浅层护坡。给出了坡面推力的计算模型和计算公式．对于格构式锚杆框架结构中的格构梁柱、锚杆和框架间面板也分别给出了相应的结构设计方法和公式．再就施工中应注意的事项给出了明确的建议和要求。     

Large-scale rock landslide slip surface location analysis and strength parameters evaluation

Large-scale rock landslides have huge impacts on various large-scale rock engineering and project operations. They are also important aspects evaluating geological disasters. In the initial evaluations on the stability of large-scale rock landslides, in most cases, it is difficult to conduct evaluation or to have accurate evaluations because most of large-scale rock landslides are huge in size, high in slopes, and located in the canyon of mountains, which makes the exploration very difficult and thus hard to get credible data on slip surface form, location, depth and strength. This paper describes the Badi landslide happened along the Lancang River, and systematically introduces methods to analyze and verify large-scale slip surface form using terrain conditions surrounding the large-scale landslide, shape of the slide walls, and development patterns of streams and gully. This paper also introduces ways to obtain strength parameters of slip surface with the soil in the slide zone by using the principles of stress state, principles of gravity compaction, structure regeneration and strength regeneration. It is confirmed that analyzed results to the slip surface are basically consistent with the exploration results. The methods introduced here have been successfully applied to evaluate the stability of Badi large-scale rock landslide and have been applied in engineering practices.     

Landslide stability for Shuitianba in the Three Gorges area

According to the data of preliminary survey, the authors established a landslide geological model,on the basis of analyses on the sensitivity of landslide, tried to simulate and calculate the landslide stability of Shuitianba with the method of transfer coefficient when it is under different strength parameters, and study the landslide mechanism. The results show that it is sensitive to the effects of shear strength parameters of sliding zone and groundwater level on landslide stability safety coefficient, which provides reliable basis for calculation of landslide stability.     

Interaction analyses between tunnel and landslide in mountain area

This paper focuses on the analytical derivation and the numerical simulation analyses to predict the interaction influences between a landslide and a new tunnel in mountain areas. Based on the slip-line theory, the disturbance range induced by tunneling and the minimum safe distance between the tunnel vault and the sliding belt are obtained in consideration of the mechanical analyses of relaxed rocks over the tunnel opening. The influence factors for the minimum safe crossing distance are conducted, including the tunnel radius, the friction angle of surrounding rocks, the inclination angle of sliding belt, and the friction coefficient of surrounding rocks. Secondly, taking account of the compressive zone and relaxed rocks caused by tunneling, the Sarma method is employed to calculate the safety factor of landslide. Finally, the analytical solutions for interaction between the tunnel and the landslide are compared with a series of numerical simulations, considering the cases for different perpendicular distances between the tunnel vault and the sliding belt. Results show that the distance between the tunnel vault and the slip zone has significant influence on the rock stress and strain. For the case of the minimum crossing distance, a plastic zone in the landslide traversed by tunneling would be formed with rather large range, which seriously threatens the stability of landslide. This work demonstrates that the minimum safe crossing distance obtained from numerical simulation is in a good agreement with that calculated by the proposed analytical solutions.     

呷爬滑坡滑带土蠕变特性及其稳定性

水库滑坡变形破坏受其岩土体蠕变特性及环境因素的影响。当滑坡进入加速变形阶段后,变形骤然增大,失稳概率增加。为了研究滑坡岩土体蠕变特性及其稳定性,选取锦屏一级水电站呷爬滑坡为研究对象,采用坡表位移监测曲线分析与室内三轴蠕变试验相结合的方法,建立了Burgers蠕变模型结合FLAC3D软件进行了滑坡稳定性研究。分析坡表位移-时间曲线发现,坡体变形特征与一般滑坡土体的蠕变特征具有相似性,滑带土室内三轴蠕变试验结果表明,滑带土变形可划分为瞬时蠕变、减速蠕变与稳定蠕变3个阶段,同时其瞬时变形量、稳定蠕变速率均随围压以及应力水平的增大而增大。基于滑带土蠕变特性的Burgers蠕变模型的计算结果,对比了常规强度折减法与考虑蠕变的强度折减法的滑坡稳定性系数,计算结果表明呷爬滑坡目前处于稳定状态,在一个计算周期内考虑蠕变的强度折减法较常规强度折减法的稳定性系数下降了0.04,因此,揭示滑坡土体蠕变特性并在此基础上研究其稳定性具有实际意义。      

浙江省玄武岩台地稳定性评价:以嵊州市地雅园滑坡为例

玄武岩台地型滑坡是一种特殊的滑坡类型，此前对其稳定性的研究较少。以嵊州市地雅园滑坡为研究对象，采用三维数值模拟的方法进行了稳定性分析评价，首先基于详细的地质资料采用三维模拟软件进行了建模；然后基于P-Ⅲ型分布曲线确定了降雨重现期，分别采用岩土软件MIDAS进行了滑坡稳定性模拟与三维运动模拟平台DAN3D软件进行了滑坡影响范围计算；最后对影响地雅园滑坡稳定性的因子进行了敏感性分析。结果表明:不同降雨强度对地雅园滑坡稳定性的影响不同，最不利工况为百年一遇降雨工况，此时滑坡稳定性系数为0.946，破坏概率为65.25%，影响范围最大增加了36.83%；内摩擦角和降雨是影响地雅园滑坡稳定性的主要因子。分析原因认为玄武岩台地型滑坡稳定性主要与硅藻土滑带、节理裂隙面的发育情况、降雨入渗滞后性有明显的相关性。本研究成果可为同类滑坡稳定性评价提供参考依据。      

新铺下二台滑坡变形机制及中长期预报模型

以奉节新铺下二台滑坡为例, 基于GPS位移监测数据、裂缝数据、降雨量及库水位等多源数据, 总结分析了大型古滑坡的复活规律, 引入滑坡中长期预报模型, 实现了以季度或月份为时间单位的跨水文年滑坡位移预测, 并通过岩土体蠕变压缩模型, 验证了推移式滑坡后缘裂缝形成机理。结果表明: ①降雨是下二台滑坡变形的主导因素, 滑坡变形使得滑体产生裂缝并成为降雨入渗通道, 加剧了岩体破碎与软弱层软化, 降低了滑坡稳定性, 集中持续降雨可使滑坡失稳破坏; ②通过模型预测值与地表监测数据的比较, 将年降雨量作为滑坡中长期预报模型中的主控因素具有实际可操作性且有助于提高滑坡中长预报精度; ③推移式滑坡后缘裂缝由滑坡推移式位移和岩土体压缩形成, 引入蠕变压缩模型计算的裂缝宽度并和监测数据的比较说明, 蠕变压缩模型非常适合该类边坡, 同时应用岩土体蠕变压缩模型反推得到岩土体平均变形模量, 判断岩体破碎程度, 可以为滑坡稳定性分析及后续工程治理提供参考。      

济南市南部山区水井北村滑坡成因机制及稳定性研究

2019年8月,济南市南部山区水井北村发生滑坡地质灾害.根据水井北村滑坡的地质背景,针对性布置物探、钻探等勘查手段,研究滑坡工程地质特征,分析水井北村滑坡类型及发生的地质成因机制;采用刚体极限平衡分析法,研究水井北村滑坡整体稳定性.研究认为断裂发育、岩层风化、地势、浅层含水层受降雨影响,是水井北村地质灾害点具备滑坡发生...