下伏采空区对水库坝基稳定性和渗漏性的影响

发布时间：2018-01-14 06:28

本文关键词：下伏采空区对水库坝基稳定性和渗漏性的影响　出处：《煤田地质与勘探》2016年04期 　论文类型：期刊论文

【摘要】：结合延安某拟建水库的工程地质条件及采空区赋存状况,在分析房柱式采空区变形破坏形式及机理的基础上,分析了房柱式采空区对拟建水库坝基的稳定性及渗漏性的影响。稳定性分析认为:拟建场地采空区处于不稳定状态,在坝体荷载作用下,将引起采空区"活化",采空区对坝基及泄水涵洞等附属构筑物的稳定存在严重影响。渗漏分析认为,下伏采空区对拟建水库渗漏存在严重影响。在采空区未发生大面积拱冒、切冒破坏的前提下,采空区引起拟建水库的渗漏量为1 671.9 m3/d,约占水库年平均流域径流量的17.9%。当采空区发生大面积拱冒、切冒破坏条件下时,采空区产生的切冒破坏将引起坝基及两侧坝肩的绕流,在切冒陷落区与不扰动区接触带出现台阶,垂直坝基轴线方向形成上下游贯通裂缝或空洞,形成管涌破坏,导致坝体失稳。鉴于此,应对坝基采空区进行有效治理,以确保建设工程安全。
[Abstract]:Combined with the engineering geological conditions of a proposed reservoir in Yan'an and the existing situation of goaf, the deformation and failure form and mechanism of the goaf are analyzed. This paper analyzes the influence of the goaf on the stability and seepage of the dam foundation of the proposed reservoir. The stability analysis shows that the goaf of the proposed site is in an unstable state under the action of dam body load. The goaf will cause "activation" of the goaf, and the goaf will have a serious effect on the stability of the dam foundation and the drainage culvert and so on. The underground goaf has serious influence on the seepage of the proposed reservoir. Under the premise that the goaf does not take place a large area of arch and cut the caving damage, the leakage of the proposed reservoir caused by the goaf is 1 671.9 m3 / d. It accounts for 17.9% of the average annual runoff of the reservoir. When a large area of arch caving occurs in the goaf, the caving failure in the goaf will cause the flow around the dam foundation and the abutment of the dam on both sides. There are steps in the contact zone between the cut and fall area and the undisturbed area, and the vertical direction of the axis of the dam foundation leads to the formation of upstream and downstream cracks or cavities, resulting in pipeline failure, which leads to the instability of the dam body. The goaf of dam foundation should be effectively treated to ensure the safety of construction project.
【作者单位】：中煤科工集团西安研究院有限公司;
【分类号】：TV223.4
【正文快照】： 过去几十年,由于煤炭资源被大量开采,我国众多矿区形成了大面积、大规模的采空区[1]。随着经济的发展,对煤炭等矿产资源的需求与日俱增,新的采空区不断形成。同时伴随着国家基础设施建设的扩展,许多水利设施不得不穿越或建立在老采空区上[2]。由于采空区的特殊性,新建的水利建

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