当前位置:首页>防城港>南宁良庆区某地500kV输电塔滑坡隐患紧急整治勘查纪实

南宁良庆区某地500kV输电塔滑坡隐患紧急整治勘查纪实

  • 2026-04-16 03:57:05
南宁良庆区某地500kV输电塔滑坡隐患紧急整治勘查纪实

一、核心成果速览

近期我单位完成南宁良庆区某地500kV输电塔滑坡隐患紧急勘查工作。查明塔基南侧发生小型浅层牵引式新滑坡,距塔基最近仅6.5m,暴雨等工况下存在二次滑塌及整体失稳风险,直接威胁500kV骨干输电线路安全,潜在停电损失约500万元,涉及10-50人安全。确定滑坡防治工程等级为一级,提出应急控险与综合治理技术路径,为紧急整治提供科学依据。

图1 滑坡前视图

二、项目背景

500kV输电塔靠近八尺江,周边涉及乡村道路、农田及祭祀用地庙,车流量较大。近期塔基南侧斜坡突发滑塌,滑动面从坡脚贯穿至坡顶,形成圈椅状滑坡体。进入雨季,边坡易受渗水软化诱发二次滑坡,而该塔作为重要电力设施,塔基失稳可能带动前后档塔基连锁影响,造成重大经济损失与安全风险。接到紧急任务后,我单位第一时间组织专业技术团队进场,开展全面勘查与风险评估,为紧急整治提供技术支撑。

三、现场勘查

(一)滑坡核心特征

该滑坡呈上部略窄、下部略宽的圈椅状,属于小型浅层新滑坡,核心参数如下:

1.规模:滑坡宽度约60m,顺坡长度约20m,滑体厚度0.3m-2.0m,平均1.5m,滑体体积约1350m³

图2  滑坡后缘

2.边界形态:后缘位于坡顶边缘,陡壁坡度50°-80°,距塔基最近6.5m;左右边界形成高0.3m-1.0m、宽10cm-30cm的陡坎,长度分别约18m17m;前缘堆积鼓胀区位于坡脚,隆起高度0.5m-2.0m,面积约300㎡;

图3  滑坡前缘鼓胀区

3.滑体性质:主要为粉质黏土夹全风化泥质粉砂岩角砾,角砾遇水易崩解,土体结构疏松、孔隙比大、力学性质差,自稳能力弱;滑体在坡面中下部较薄(0.3m-1.0m),坡脚堆积较厚(1.0m-2.0m),坡脚杂树已被冲歪斜。

图4  滑坡左边界

图5  滑坡右边界

(二)滑面与滑床特征

经探坑、钻孔勘查,主滑动面位于浅层0.5m-2m处,呈圆弧形,主要发育在粉质黏土层中,受地下水位浸泡软化形成;滑床同样以硬塑状粉质黏土为主,后期遇雨水易表层软化,可能形成新的软弱面,为二次滑塌埋下隐患。

(三)地形与地质条件

1.地形地貌:滑坡区属河流阶地地貌下的丘坡,边坡高度约15m,坡度45°-65°,外侧存在天然临空面,为滑坡形成提供了地形条件;

2.地层岩性:勘查区主要出露第四系滑坡堆积层、植物层、冲洪积层及白垩系下统泥质粉砂岩,其中粉质黏土长期遇水强度大幅下降,是滑坡形成的核心物质基础;

3.水文条件:坡脚临近八尺江,雨季地下水位升高,长期浸泡会显著软化岩土体;坡顶无常年地表水,仅存在降雨形成的临时径流。

四、成因分析

该滑坡的发生是地形、地层、水文、降雨及人类活动共同作用的结果,具体如下:

1.地形与地层基础45°-65°的高陡边坡提供了临空条件,粉质黏土夹风化角砾的岩土组合,结构疏松、抗剪强度低,遇水易软化,为滑坡提供了先天条件;

2.降雨与地下水诱发持续暴雨使滑体饱和,既增加土体自重、产生渗透力与浮托力,又大幅降低岩土体力学性能;同时八尺江水位上升导致边坡内侧地下水位抬高,浸泡中下部岩土接触面,进一步削弱抗滑力,成为滑坡发生的关键诱因;

3.人类活动加剧:坡脚开挖小道、修建监测站、开垦种地,破坏了原始坡体平衡,丧失部分坡脚反压土体;坡顶及边坡种植芒果树、修建土地庙,破坏植被覆盖,加剧雨水入渗,进一步压缩坡体安全储备。

综上,滑坡失稳机理为:高陡边坡+弱抗剪土体,在持续暴雨与地下水浸泡双重作用下,滑体自重增加、抗剪强度下降,坡脚抗滑力不足,最终引发牵引式滑塌。

五、稳定性评价与风险预判

(一)稳定性分析

依据勘查规范,对不同剖面、四种工况进行计算评估:

1.部分剖面在天然、地震工况下处于稳定-基本稳定状态,但暴雨、暴雨+地震工况下均达不到安全系数要求,中部区域直接处于不稳定状态;

2.塔基南侧边坡中部为核心不稳定区,两侧为稳定-基本稳定区,但中部失稳后易带动两侧发生牵引式滑塌,最终导致边坡整体失稳。

(二)风险发展趋势

若不及时治理,随着雨季来临,风险将持续升级:

1.边坡中部不稳定区首先在暴雨等不利工况下发生二次滑塌;

2.二次滑塌将牵引两侧边坡同步失稳,形成大面积整体滑塌;

3.坡体持续滑塌会导致塔基周边保护土体不断流失,最终威胁塔基稳定,可能引发杆塔倾斜、倒塌,造成500kV输电线路中断,带动前后档塔基连锁风险,同时影响周边高速、乡村道路通行安全。

六、应急防治措施

为阻断滑坡进一步发展,保障线路与周边安全,需立即实施以下应急措施:

1.坡面防渗覆盖:对滑坡体及周边裸露坡面,采用防水土工布+彩条布双层覆盖,边缘用土袋压实固定,阻断雨水直接冲刷与入渗,延缓土体软化;

2.临时排水疏导:在坡顶外侧设置临时截水沟,坡脚开挖排水沟,将地表汇水与坡体渗水引排至远离塔基及边坡的安全区域,降低地下水位;

3.安全隔离管控:在滑坡影响范围、塔基周边及道路侧设置硬质警戒线与警示标识,明确避险路线,严禁无关人员、车辆进入危险区域;

4.加密监测巡查:建立“24小时巡查+降雨时段实时监测机制,重点监测边坡裂缝发展、坡体位移及塔基沉降情况,配备应急通讯设备,异常情况立即上报并启动避险预案。

七、长效治理方向

结合滑坡特征、地质条件及电网安全要求,长效治理需采用抗滑+防渗+排水综合治理方案,核心思路如下:

1.抗滑加固:针对滑体及边坡整体,采用锚杆框架梁或抗滑桩进行深层加固,增强坡体抗滑能力,防止整体失稳;

2.坡面防护:在加固基础上,铺设生态网格或喷射混凝土护面,结合植被恢复,形成工程防护+生态固坡双重保障,减少雨水冲刷;

3.完善排水系统:在坡顶、坡面、坡脚设置分级截排水体系,配套渗沟、排水孔等设施,高效疏导地表径流与地下水,从根源消除软化诱因;

4.塔基周边防护:对塔基南侧6.5m范围内的坡体进行重点加固,设置防护挡墙或反压护道,增加塔基周边土体稳定性,避免基础外露。

八、结语

500kV输电线路作为区域电力输送的大动脉,其安全稳定直接关系民生保障与经济发展。本次滑坡隐患具有突发、紧急、风险高的特点,我单位通过快速响应、精准勘查,厘清隐患成因与风险趋势,为紧急整治提供了清晰技术路径。未来将持续以专业技术支撑电网地质灾害应急处置,用科学治理筑牢骨干电网安全防线,守护区域电力供应与群众生命财产安全。

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  1. CONNECT:[ UseTime:0.000483s ] mysql:host=127.0.0.1;port=3306;dbname=d460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000703s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000259s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
  6. SELECT * FROM `set` [ RunTime:0.000243s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000732s ]
  8. SELECT * FROM `article` WHERE `id` = 495503 LIMIT 1 [ RunTime:0.000558s ]
  9. UPDATE `article` SET `lasttime` = 1776710161 WHERE `id` = 495503 [ RunTime:0.005056s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000342s ]
  11. SELECT * FROM `article` WHERE `id` < 495503 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000604s ]
  12. SELECT * FROM `article` WHERE `id` > 495503 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000450s ]
  13. SELECT * FROM `article` WHERE `id` < 495503 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001041s ]
  14. SELECT * FROM `article` WHERE `id` < 495503 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000969s ]
  15. SELECT * FROM `article` WHERE `id` < 495503 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000866s ]
0.081051s