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徐州夏桥一号井延深工程总深305米,其-330米水平马头门全部处于灰白色中粒粉砂岩中。该岩层稳定性很差,其特点是泥质胶结,手捏即碎,抗压强度仅为110公斤/厘米~2,遇水膨胀如泥。原设计内用工字钢支架、外包厚550毫米钢筋混凝土作为永久支护。我们认为马头门断面大、岩石强度低,采用上述支护型式不仅进度慢、临时支护复杂,而且初期抗压性能差,也不利安全施工。而采用光爆锚喷方法施工,可缩短岩石暴露的时间,避免岩石受淋水浸蚀,为施工创造较好的条件,保证支护质量。因而,我们改用了光爆锚喷工艺。
Xiazhou Qiaqiao No. 1 well depth of 305 meters deep, its -330 meters of the level of all the Ma Tau door in the gray medium-grained siltstone. The stability of the rock is poor, characterized by mud cementation, pinch that crushing, compressive strength of only 110 kg / cm ~ 2, water swelling mud. The original design with I-beam brackets, outsourcing thick 550 mm reinforced concrete as a permanent support. We think that Ma Taumen section is large and rock strength is low. Adopting the above support type, not only the progress is slow, the temporary support is complex, but also the initial compression performance is poor, which is also unfavorable to safety construction. The use of light burst anchor spray method of construction, can shorten the time of rock exposure, to avoid rock erosion by water, for the construction to create better conditions to ensure the quality of support. Therefore, we use the light burst anchor spray process.