巷道围岩渗水对树脂锚杆锚固力的影响性分析

在围岩渗水严重的巷道,进行树脂锚杆的锚固时,锚固力往往低于理论计算值,其可靠性难以保证。结合现场和实验室试验,对树脂锚杆锚固时,钻孔内有流水和钻孔内有积水条件下锚固力的影响进行了分析,并结合现场应用,提出了在此条件下提高锚固力的一些途径。

白石岭隧道坍方冒顶的处理与经验体会

重点介绍深圳市白石岭大断面公路隧道,在全-强风化的花岗岩及第四系坡、残积土施工中遇到花岗岩微风化球体的不良地质条件。由于大气降水、围岩渗水致使围岩缺乏自稳性,造成隧道连续大规模坍方冒顶,并列举典型事例,介绍事故处理措施、过程和效果,对施工中的经验教训进行了归纳总结,提出一些看法和建议。

富水围岩平硐渗漏水的注浆堵水治理

针对何家塔煤矿辅运平硐围岩渗漏水的问题,运用地质雷达和钻孔窥视的方法对巷道围岩裂隙损伤进行探测,查明了平硐围岩的损伤及井壁渗漏水的原因。根据围岩损伤探测结果,针对性地制定深、浅孔组合的注浆堵水治理技术方案,并对现场出水段井筒实施了空腔充填、裂缝封堵、结构补强相结合的注浆治理。利用地质雷达对注浆效果进行检测,检测结果显示,轻微裂隙、中等裂隙、严重裂隙、一般富水、空洞、严重富水的注浆堵水修复率分别为52%、33%、73%、77%、100%、100%,平硐井壁的渗水灾害得到了明显的控制。何家塔煤矿辅运平硐的注浆堵水技术对类似地质条件的巷道围岩注浆堵水治理具有一定的借鉴意义。

某电站交通隧洞洞挖施工避免发生塌方的研究

在线状紧密褶皱,并伴有数条同方向展布的压扭性断裂分布的地带,对修建隧道存在一个无法绕开的难题:如何在洞挖过程中有效避免塌方.为避免洞挖时发生塌方情况,通过对某工程交通隧道的施工研究,得出如何有效避免塌方,合理提高洞挖进度,进而保证施工工期.

Analysis on mechanism and key factors of surrounding rock instability in deeply inclined roadway affected by argillation and water seepage

Based on the characteristics of surrounding rocks for deeply inclined roadway affected by argillation and water seepage, a structure model of layer crack plate was established to analyze the shear sliding instability mechanism. Through solid mechanics analysis of anchored surrounding rock with defect from water seepage, combined with numerical analysis for instability mechanism under water seepage in deeply inclined roadway, key factors were proposed. Results show that with increasing height of layer crack plate, lateral buckling critical load value for high wall of the roadway decreases; there is a multistage distribution for tensile stress along the anchor bolt with defect under pulling state condition;groundwater seepage seriously affects the strength of surrounding rock of the roadway, to some extent the plastic zone of the high side rises up to 8 m. Finally some support strategies were proposed for the inclined roadway and successfully applied to Haoyuan coal mine in Tiela mining area,western China.