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巷道整体采用混凝土砌(石旋)支护时,其砌(石旋)体若发生破裂,则维护十分困难。如采取再行加固办法,不仅维修费用高,而且大多造成巷道有效断面减小,严重时将使巷道废弃。从某矿+30米原2~#车场为例:先后破裂两次,两次的加固费用共达5.9万元;巷道有效断面缩小51.65％,而巷道掘进断面利用率只反30.08％,净断面规格已频临安全规程规定的下限。过多的人力和物力的消耗必须及时防止,依循多快好省的总路线精神和增产节约的原则,迫切要求对基建巷道混凝土砌(石旋)体破裂的原因进行探索与研
When the whole tunnel adopts concrete masonry (stone rotary) support, if it is broken, it will be very difficult to maintain. If we adopt the method of reinforcement again, not only the maintenance cost is high, but most of the effective sections of the roadway are reduced, and when the roadway is serious, the roadway will be discarded. From a mine +30 meters of the original 2 ~ # yard as an example: has cracked twice, twice the total cost of up to 59,000 yuan reinforcement; roadway effective section reduced by 51.65%, while roadway section utilization only 30.08%, the net section specification Has been set by the safety rules of the lower limit. Excessive manpower and material consumption must be promptly prevented. In accordance with the principle of more efficient and more economical province and the principle of increasing production and saving, it is urgently required to explore and study the reasons for the collapse of concrete masonry