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四、膨胀地压的呈现规律膨胀地压的呈现规律,是与支护的特性有关的。1.刚性支架当井巷开挖后即安设刚性支架时,围岩在某些外界因素作用下体积膨胀,连续向井巷内挤入,产生巨大压力使支架破坏,其承受压力的呈现规律如图8a所示。围岩形成自由膨胀,水气进一步浸入直到岩体充塞整个开挖空间。2.可缩性支架开挖后如立即安设可缩性支架,当膨胀压力大于支护抗力时,支护退缩,围岩向空间产生位移,压力迅速下降。由于岩体松
Fourth, the law of the expansion of the pressure of the law showing the law of expansion pressure is related to the characteristics of support. 1. Rigid Support When the rigid support is installed after the excavation of the roadway, the surrounding rock expands in volume under the influence of some external factors and continuously pushes it into the roadway to generate huge pressure to destroy the support. The law of bearing pressure Figure 8a shows. Surrounding rock formation free expansion, further dipping water until the rock fill the entire excavation space. 2. retractable scaffold immediately after installation of retractable stent, when the expansion pressure is greater than the support resistance, support retreat, rock displacement to the space, the pressure decreased rapidly. Because rock loose