某岩溶矿山电耙机基座塌陷形成条件及治理技术

某电耙机基座位于南方某岩溶矿山,地基由粉质黏土、卵石及壶天群灰岩组成。2009年6月发生塌陷,平面上塌陷坑长约3 m,短约2 m,造成电耙机大部被埋入溶洞内,严重威胁到周边尾砂堆场及水泥罐的安全。调查分析及土洞塌陷过程模拟表明,该电耙机基座塌陷主要由于壶天群灰岩溶蚀裂隙发育强烈,地下水位在岩土界面附近上下波动,以及日常生产中电耙机基础旁长期受冲水综合作用,致使基岩面上的土层颗粒被潜蚀带出进而形成土洞坍塌。针对以往塌陷治理多以回填为主,复塌比较频繁,本电耙机基座塌陷采用孔内旋喷造浆注浆方法处理,即先根据孔深的不同向水泥浆中添加不同比例的速凝剂,然后将添加速凝剂的水泥浆液快速送入孔内,并利用高压和...

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Bibliographic Details
Published in中国岩溶 Vol. 32; no. 4; pp. 433 - 436
Main Author 王军 赵恰
Format Journal Article
LanguageChinese
Published 长沙矿山研究院有限责任公司,湖南 长沙,410012 2013
Subjects
土洞形成机理
孔内造浆及注浆法
岩溶塌陷
karst collapse
soil hole formation mechanism
岩溶塌陷
method of mud making and grouting in hole
孔内造浆及注浆法
土洞形成机理
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ISSN1001-4810

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Summary:某电耙机基座位于南方某岩溶矿山,地基由粉质黏土、卵石及壶天群灰岩组成。2009年6月发生塌陷,平面上塌陷坑长约3 m,短约2 m,造成电耙机大部被埋入溶洞内,严重威胁到周边尾砂堆场及水泥罐的安全。调查分析及土洞塌陷过程模拟表明,该电耙机基座塌陷主要由于壶天群灰岩溶蚀裂隙发育强烈,地下水位在岩土界面附近上下波动,以及日常生产中电耙机基础旁长期受冲水综合作用,致使基岩面上的土层颗粒被潜蚀带出进而形成土洞坍塌。针对以往塌陷治理多以回填为主,复塌比较频繁,本电耙机基座塌陷采用孔内旋喷造浆注浆方法处理,即先根据孔深的不同向水泥浆中添加不同比例的速凝剂,然后将添加速凝剂的水泥浆液快速送入孔内,并利用高压和高转速切割周边土层,使得单纯的水泥浆成为水泥黏土浆液,在高压下浆液劈裂土层,从而达到快速封堵溶洞口和加固土层的目的。检测结果显示,该方法不仅能有效快速地封堵基岩面溶蚀裂隙或溶洞口并加固土层,消除塌陷的基本条件,而且工艺成熟,成本远小于注浆加固,适合在岩溶矿区推广应用。
Bibliography:WANG Jun, ZHAO Qia （Changsha Institute of Mining Research, Changsha, Hunan 410012, China）
45-1157/P
The raker’s substrate,situated in a karst mine in southern China,is composed of silty clay,peb-bles and limestone.In June 2009 a 3m long and 2m wide collapse took place,causing the raker being buried in a cave.The collapse seriously threatens the safety of the surrounding tailing depot and cement tank.Anal-ysis and simulation show that the collapse of the substrate is mainly led by strongly developed karst frac-tures,groundwater table fluctuation and long-term water scour that resulting bedrock surface soil particles being brought out and then causing the cave to collapse.The former treatment for collapse is backfill gener-ally,but re-collapse is frequent.In view of the case,the mud hole rotary j et grouting approach in the treat-ment is adopted this time.That is to say,accelerator of different ratio is added to the cement paste according to the depth firstly,and then,putting the accelerator-added cement paste ra
ISSN:1001-4810