CN107035387B - 一种强烈动压影响下巷道围岩控制方法 - Google Patents
一种强烈动压影响下巷道围岩控制方法 Download PDFInfo
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- CN107035387B CN107035387B CN201611141713.5A CN201611141713A CN107035387B CN 107035387 B CN107035387 B CN 107035387B CN 201611141713 A CN201611141713 A CN 201611141713A CN 107035387 B CN107035387 B CN 107035387B
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- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
Abstract
本发明涉及强烈动压影响下巷道围岩控制方法，可有效解决强烈动压影响下巷道大变形、巷道支护效率低和支护成本高的技术问题，其解决的技术方案是，包括以下步骤：第一步，喷浆，第二步，浅部注浆，第三步，刷巷，第四步，锚杆施工，第五步，深部注浆，第六步，锚索施工，第七步，形成承载拱，本发明最终在巷道围岩锚注加固区域中形成一个稳定的承载拱，而承载拱与稳定岩层之间的破碎区，有效降低了上部采面采动过程产生的动载荷的影响，吸收和转移大部分能量，降低了对承载拱处的破坏，确保了巷道围岩稳定性，有效控制了巷道大变形，提高了巷道支护效率，节约了支护成本，是巷道围岩控制方法上的创新。
Description
技术领域
本发明涉及煤矿生产领域，特别是一种通过对强烈动压影响后破碎围岩进行注浆形成再造承载拱，结合利用深部破碎区卸压吸能而消耗采动形成的动载荷，进一步降低采动对围岩破碎作用，保证巷道围岩稳定的巷道围岩控制方法。
背景技术
强烈动压影响下的巷道变形严重、围岩破碎，巷道支护效果较差，是煤矿安全生产中亟需解决的技术难题，在复杂地质条件下，该类巷道支护更加困难。在高应力、强扰动情况下传统巷道支护形式也难以满足该类巷道的支护要求。相关学者对该类巷道的支护技术进行研究，形成了一系列的支护体系，但仍然存在以下几点问题：①巷道变形大，围岩破碎，造成锚杆锚固效果差、易脱锚失效；②金属网易形成“网兜”，甚至被撕裂，完全起不到较好的护表效果；③传统的棚式支护在强烈动压作用下变形严重，甚至被折断；④注浆工艺中盲目扩大注浆半径，完全固结了巷道深部破碎的塑性区围岩，在强烈动荷载作用时，造成加固区受到刚性破坏，而没有考虑减缓围岩深部应力释放及让压的措施。⑤巷道围岩破碎、裂隙发育严重，造成注浆过程中漏浆严重，注浆效果较差。⑥巷道返修率高，维持时间短，经多次返修造成材料的浪费，支护成本较高。鉴于上述存在的问题，发明出一种在强烈动压作用下，能够有效控制巷道围岩稳定、确保煤矿安全生产的方法是目前亟需解决的技术问题。
发明内容
针对上述情况，为解决现有技术之缺陷，本发明之目的就是提供一种强烈动压影响下巷道围岩控制方法，通过锚固区域的分次注浆加固形成一个稳定的承载拱，同时，承载拱之外的破碎区起到卸压吸能作用而消耗采动形成的动载荷，可有效解决强烈动压影响下巷道大变形、巷道支护效率低和支护成本高的技术问题。
本发明解决的技术方案是，包括以下步骤：第一步，喷浆，在施工巷道处对巷道围岩表面喷射一层厚度50mm的水泥砂浆，喷射口垂直围岩表面，顺序由墙基角开始由下往上，先凹后凸，先墙后拱，依次进行喷浆，不要固定在一点处喷浆，保证喷浆层表面平整、均匀，最终在破碎围岩表面形成一层密封层，在进行注浆过程中有效防止浆液在围岩表面出现泄露；
第二步，浅部注浆，在完成喷浆段巷道处，架设钻机钻打注浆孔，根据巷道尺寸布置注浆孔，将封孔器套在注浆管一端150mm处，将注浆管另一端插入注浆孔，将注浆软管与注浆管连接，再将注浆软管与注浆泵出浆口连接，启动注浆泵进行注浆，注浆过程中观测并记录注浆压力、注浆时间，保证所注第一浆液在浅部注浆区域扩散2~3m，当注浆压力突然发生变化时，查明情况并处理，保证第一浆液在巷道围岩表面及深部围岩中得到有效扩散，起到固结破碎围岩的目的；
第三步，刷巷，注浆完成后待第一浆液完全固化并达到设计强度后，对变形严重的巷道进行刷巷，刷巷过程中，由巷道顶部—拱部—帮部—底板依次进行，首先将表面的水泥砂浆清理掉，再将围岩表面部分破碎的岩块进行处理，由表及里依次进行刷巷，达到巷道设计尺寸；
第四步，锚杆施工，在巷道中架设钻机钻打若干锚杆钻孔，巷道帮部下位锚杆钻孔与底板的水平倾角为20°，锚杆钻孔之间间距为0.8m，排距为0.8m，钻孔完成后，将树脂锚固剂推入锚杆钻孔底部，将锚杆一端插入锚杆钻孔，螺纹端通过连接器与钻机相连接，启动锚杆钻机搅拌树脂锚固剂，然后依次安装托盘、螺母，并施加预紧力；
第五步，深部注浆，在一段巷道中锚杆锚固完成后，重新钻打注浆孔实施深部注浆，注浆材料为超细水泥，注浆过程中控制并记录注浆压力与注浆时间，保证第二次所注第二浆液扩散范围达到8~10m深度，固结破碎区的围岩；
第六步，锚索施工，在巷道拱部与顶部布置若干锚索钻孔，间距为0.8m，排距为1.0m，锚索钻孔完成后，将锚索锚固剂放入钻孔中，将锚索一端插入锚索钻孔中，另一端与钻机连接，实施锚索锚固剂的搅拌，搅拌完成后，然后依次安装锚索托盘及锁具，并实施张拉预紧；
第七步，形成承载拱，通过以上步骤锚杆、锚索搅拌树脂锚固剂、施加预紧力，最终在锚注加固围岩中形成一个承载拱。
本发明通过上述施工工艺的操作，最终在巷道围岩锚注加固区域中形成一个稳定的承载拱，锚索锚固在巷道深部注浆加固岩层中，承载能力大，对巷道破碎围岩具有较好的约束力，而承载拱与稳定岩层之间的破碎区，有效降低了上部采面采动过程产生的动载荷的影响，吸收和转移大部分能量，降低了对承载拱处的破坏，确保了巷道围岩稳定性，有效控制了巷道大变形，提高了巷道支护效率，节约了支护成本，是巷道围岩控制方法上的创新。
附图说明。
图1 为本发明浅部注浆剖面示意图。
图2 为本发明再造承载拱剖面示意图。
图3 为本发明注浆封孔器立体图。
具体实施方式。
以下结合附图对本发明的具体实施方式作进一步详细说明。
由图1-3给出，本发明实施对象为受强烈动压影响巷道，以上部采动影响为例，在上层工作面1开采时，对临近巷道5施加动荷载12，在巷道围岩中形成了破碎区3，增加了巷道5的支护难度，针对该类巷道严重变形、表面破碎，巷道支护效果差的技术难题，提出了一种强烈动压影响下巷道围岩控制方法，涉及到喷射水泥砂浆、注浆、锚固等施工工艺，其具体操作按以下步骤进行：
第一步，喷浆，在施工巷道5处对巷道围岩表面喷射一层厚度50mm的水泥砂浆6，喷射口垂直围岩表面，顺序由墙基角开始由下往上，先凹后凸，先墙后拱，依次进行喷浆，不要固定在一点处喷浆，保证喷浆层表面平整、均匀，最终在破碎围岩表面形成一层密封层，在进行注浆过程中有效防止浆液在围岩表面出现泄露；
第二步，浅部注浆，在完成喷浆段巷道处，架设钻机钻打注浆孔7，根据巷道尺寸布置注浆孔7，将封孔器9套在注浆管8一端150mm处，将注浆管8另一端插入注浆孔7，将注浆软管10与注浆管8连接，再将注浆软管10与注浆泵出浆口连接，启动注浆泵进行注浆，注浆过程中观测并记录注浆压力、注浆时间，使注浆压力维持在5-10MPa，确保所注第一浆液11在浅部注浆区域4扩散2~3m，起到固结破碎围岩的目的；
第三步，刷巷，注浆完成后待第一浆液11完全固化后，对变形严重的巷道5进行刷巷，刷巷过程中，由巷道顶部—拱部—帮部—底板依次进行，首先将表面的水泥砂浆6清理掉，再将围岩表面部分破碎的岩块进行处理，由表及里依次进行刷巷，达到巷道设计尺寸；
第四步，锚杆施工，在巷道中架设钻机钻打若干锚杆钻孔13，巷道5帮部下位锚杆钻孔13与底板的水平倾角为20°，锚杆钻孔之间间距为0.8m，排距为0.8m，钻孔完成后，将树脂锚固剂14推入锚杆钻孔13底部，将锚杆15一端插入锚杆钻孔13，螺纹端通过连接器与钻机相连接，启动锚杆钻机搅拌树脂锚固剂14，然后依次安装托盘16、螺母17，并施加预紧力；
第五步，深部注浆，在一段巷道中锚杆锚固完成后，重新钻打注浆孔实施深部注浆，注浆材料为超细水泥，注浆过程中控制并记录注浆压力与注浆时间，保证第二次所注第二浆液23扩散范围达到8~10m深度，固结破碎区3的围岩；
第六步，锚索施工，在巷道拱部与顶部布置若干锚索钻孔20，间距为0.8m，排距为1.0m，锚索钻孔完成后，将锚索锚固剂21放入钻孔中，将锚索22一端插入锚索钻孔20中，另一端与钻机连接，实施锚索锚固剂21的搅拌，搅拌完成后，然后依次安装锚索托盘19及锁具18，并实施张拉预紧；
第七步，形成承载拱，通过以上步骤锚杆、锚索搅拌树脂锚固剂、施加预紧力，最终在锚注加固围岩中形成一个承载拱24。
为保证巷道支护效果，所述的巷道5支护方式采用注浆+锚杆、锚索+锚网+钢带的支护形式，锚杆及锚索均为强力锚杆与强力锚索，锚杆间距0.8m，排距0.8m，锚索间距0.8m，排距1.0m，锚杆与锚索采用“三角形”布置方式，即两根锚杆与一根锚索呈“三角形”布置方式，在进行刷巷后进行锚网、钢带的铺设、搭接，通过锚杆的锚固对巷道5进行固定。
为了保证注浆封孔效果，所述的封孔器9为黑色硬质锥形橡胶，呈空心锥形体，中间有圆孔，套在注浆管8一端150mm处，封孔器9具有良好的弹性，密封效果较好。
所述的第一浆液11为比表面积大于600的超细水泥，具有较好的流动性及固结强度，凝固强度达到40MPa。
所述的锚杆15为强力锚杆，其材质为左旋无纵筋螺纹钢，直径20mm，长度2.0m，一端带有150mm的螺纹，强力锚杆是指锚杆杆材BHRB600及以上，直径≥22mm，屈服强度≥600MPa，拉断强度≥800MPa，延伸率≥17%。
所述的锚索22为高强锚索，长6.2m，直径17.8mm。
所述的锚杆钻孔13每排设有8个，锚索钻孔20每排设有3个。
本发明的使用情况是，首先根据矿井实际地质条件以及巷道围岩的变形情况，确定施工工序及锚杆、锚索的支护参数，当巷道围岩变形量大、破碎较为严重时，在表面喷浆、围岩注浆之后应适当进行刷巷，变形不严重时，则不需要进行刷巷（其它步骤相同），在巷道5开挖后，扰动了原岩应力分布状态，导致巷道围岩出现破碎，形成塑性区，尤其是在受到强烈动压荷载12影响时，扩大了巷道破碎区（塑性区）3的范围，加大了巷道5支护难度。本发明提出的强烈动压影响巷道围岩控制技术通过表面喷射水泥砂浆6，在围岩表面形成一层坚固的密封层，在进行浅部注浆过程中，有效防止第一浆液11通过表面破碎的围岩裂隙泄露，增大了第一浆液11的扩散范围，促使第一浆液11向围岩内部2~3m区域扩散，固结浅部破碎围岩，闭合裂隙与离层，为锚杆在锚固区域提供一个稳定的着力点，同时，深部注浆将围岩深部的裂隙及离层加以闭合，固结深部破碎区，为锚索的张拉预紧提供一个有力的着力点。通过注浆加固区域锚杆、锚索的强力支护，在锚注范围内形成一个稳定的再造承载拱24。在强烈动压影响作用下锚注加固区域之外的破碎区3，吸收了巷道深部围岩2释放的应力和位移量，极大地降低了对再造承载拱24的破坏，有效控制了巷道围岩的稳定。
本发明提供了一种强烈动压影响巷道围岩控制方法，通过锚固加固形成了一种再造承载拱体系，有效保证了强烈动压影响作用下巷道围岩的稳定，减小了巷道返修率，节约了支护成本，是巷道围岩控制方法上的创新，具有重要的社会经济意义。
Claims (6)
1.一种强烈动压影响下巷道围岩控制方法，其特征在于，按以下步骤进行：
第一步，喷浆，在施工巷道(5)处对巷道围岩表面喷射一层厚度50mm的水泥砂浆(6)，喷射口垂直围岩表面，顺序由墙基角开始由下往上，先凹后凸，先墙后拱，依次进行喷浆，不要固定在一点处喷浆，保证喷浆层表面平整、均匀，最终在破碎围岩表面形成一层密封层，在进行注浆过程中有效防止浆液在围岩表面出现泄露；
所述的巷道(5)支护方式采用注浆+锚杆、锚索+锚网+钢带的支护形式，锚杆及锚索均为强力锚杆与强力锚索，锚杆间距0.8m，排距0.8m，锚索间距0.8m，排距1.0m，锚杆与锚索采用“三角形”布置方式，即两根锚杆与一根锚索呈“三角形”布置方式，在进行刷巷后进行锚网、钢带的铺设、搭接，通过锚杆的锚固对巷道(5)进行固定；
第二步，浅部注浆，在完成喷浆段巷道处，架设钻机钻打注浆孔(7)，根据巷道尺寸布置注浆孔(7)，将封孔器(9)套在注浆管(8)一端150mm处，将注浆管(8)另一端插入注浆孔(7)，将注浆软管(10)与注浆管(8)连接，再将注浆软管(10)与注浆泵出浆口连接，启动注浆泵进行注浆，注浆过程中观测并记录注浆压力、注浆时间，使注浆压力维持在5-10MPa，确保所注第一浆液(11)在浅部注浆区域(4)扩散2~3m，起到固结破碎围岩的目的；
第三步，刷巷，注浆完成后待第一浆液(11)完全固化，对变形严重的巷道(5)进行刷巷，刷巷过程中，由巷道顶部—拱部—帮部—底板依次进行，首先将表面的水泥砂浆(6)清理掉，再将围岩表面部分破碎的岩块进行处理，由表及里依次进行刷巷，达到巷道设计尺寸；
第四步，锚杆施工，在巷道中架设钻机钻打若干锚杆钻孔(13)，巷道(5)帮部下位锚杆钻孔(13)与底板的水平倾角为20°，锚杆钻孔之间间距为0.8m，排距为0.8m，钻孔完成后，将树脂锚固剂(14)推入锚杆钻孔(13)底部，将锚杆(15)一端插入锚杆钻孔(13)，螺纹端通过连接器与钻机相连接，启动锚杆钻机搅拌树脂锚固剂(14)，然后依次安装托盘(16)、螺母(17)，并施加预紧力；
第五步，深部注浆，在一段巷道中锚杆锚固完成后，重新钻打注浆孔实施深部注浆，注浆材料为超细水泥，注浆过程中控制并记录注浆压力与注浆时间，保证第二次所注第二浆液(23)扩散范围达到8~10m深度，固结破碎区(3)的围岩；
第六步，锚索施工，在巷道拱部与顶部布置若干锚索钻孔(20)，间距为0.8m，排距为1.0m，锚索钻孔完成后，将锚索锚固剂(21)放入钻孔中，将锚索(22)一端插入锚索钻孔(20)中，另一端与钻机连接，实施锚索锚固剂(21)的搅拌，搅拌完成后，然后依次安装锚索托盘(19)及锁具(18)，并实施张拉预紧；
第七步，形成承载拱，通过以上步骤锚杆、锚索搅拌树脂锚固剂、施加预紧力，最终在锚注加固围岩中形成一个承载拱(24)。
2.根据权利要求1所述的强烈动压影响下巷道围岩控制方法，其特征在于，所述的封孔器(9)为黑色硬质锥形橡胶，呈空心锥形体，中间有圆孔，套在注浆管(8)一端150mm处，封孔器(9)具有良好的弹性，密封效果较好。
3.根据权利要求1所述的强烈动压影响下巷道围岩控制方法，其特征在于，所述的第一浆液(11)为比表面积大于600的超细水泥，具有较好的流动性及固结强度，凝固强度达到40MPa。
4.根据权利要求1所述的强烈动压影响下巷道围岩控制方法，其特征在于，所述的锚杆(15)为强力锚杆，其材质为左旋无纵筋螺纹钢，直径20mm，长度2.0m，一端带有150mm的螺纹，强力锚杆是指锚杆杆材BHRB600及以上，直径≥22mm，屈服强度≥600MPa，拉断强度≥800MPa，延伸率≥17%。
5.根据权利要求1所述的强烈动压影响下巷道围岩控制方法，其特征在于，所述的锚索(22)为高强锚索，长6.2m，直径17.8mm。
6.根据权利要求1所述的强烈动压影响下巷道围岩控制方法，其特征在于，所述的锚杆钻孔(13)每排设有8个，锚索钻孔(20)每排设有3个。
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