CAJ | 학술논문

针对大变形巷道顶板支护系统中锚杆与锚索受力和变形不协调的问题，研发了一种新型可接长锚杆。在对普通锚杆、锚索及新型可接长锚杆拉伸试验和力学分析的基础上，结合大变形巷道顶板围岩的变形破坏特征，提出了大变形巷道顶板可接长锚杆耦合支护系统，建立并分析了可接长锚杆耦合支护系统与锚索耦合支护系统的本构模型。研究表明：当巷道顶板变形量超过锚索最大延伸量时，锚索耦合支护系统中锚索由于延伸率低，过早于普通锚杆达到延伸极限而破断，而可接长锚杆能与普通锚杆在受力和变形2方面协调同步地支护顶板围岩；可接长锚杆能够提高顶板围岩的自承性能，并在保证较强支护力的同时提供更大的让压距离。可接长锚杆耦合支护系统成功应用于赵固一矿11031巷道试验段中，顶板变形量比原支护方案减少了20%左右，顶板围岩从开挖到稳定的时间缩短了33%，且顶板变形稳定后顶板下沉速率较原支护方案明显降低。
침대대변형항도정판지호계통중묘간여묘색수력화변형불협조적문제，연발료일충신형가접장묘간。재대보통묘간、묘색급신형가접장묘간랍신시험화역학분석적기출상，결합대변형항도정판위암적변형파배특정，제출료대변형항도정판가접장묘간우합지호계통，건립병분석료가접장묘간우합지호계통여묘색우합지호계통적본구모형。연구표명：당항도정판변형량초과묘색최대연신량시，묘색우합지호계통중묘색유우연신솔저，과조우보통묘간체도연신겁한이파단，이가접장묘간능여보통묘간재수력화변형2방면협조동보지지호정판위암；가접장묘간능구제고정판위암적자승성능，병재보증교강지호력적동시제공경대적양압거리。가접장묘간우합지호계통성공응용우조고일광11031항도시험단중，정판변형량비원지호방안감소료20%좌우，정판위암종개알도은정적시간축단료33%，차정판변형은정후정판하침속솔교원지호방안명현강저。
In view of the force-deformation incoordination problems of traditional anchor and cable in largely deformed roadway roof support system, a new type of lengthened bolt is invented. After a tensile test and mechanical analysis of traditional anchor, cable and new lengthened bolt and an analysis of the deformation and failure characteristics of surrounding rock in large deformation roadway roof, ,a support system for large deformation roadway roof called lengthened bolt coupling support system is devised. The constitutive models of lengthened bolt coupling support system and cable coupling support system are established and analyzed. The research result shows that when the roof deformation exceeds the maximum elongation of cable, the cable in the coupling support system reaches the elongation equi-librium and is broken earlier than the traditional bolt due to the low elongation, but lengthened and tra-ditional bolt could coordinately support the surrounding rock of roof both in deformation and force as-pects. Lengthened bolt could improve the self-loading performances of surrounding rock, and not only has a large amount of elongation, but ensures a strong supporting force. Lengthened bolt coupling sup-port system has been successfully applied to the test area of 11031 in Zhaogu Mine. The deformation of new support program is 20% less than that of the ordinary program. Besides, time-cost decreases 33%from roadway excavation to a stable roof rock, and the subsidence speed turns to be much slower than that of an ordinary program.