Test and Research of Blasting in Deep Soft Subgrade
Zhang Zhi · Zhongguo tiedao kexue · 2002
During the test sand wicks are prepared, piled up, pre pressed and at the same time blasting is conducted in deep underground to achieve quick consolidation of the drained ground and fast drainage of the water in soft ground. The paper analyzes the water pressure change in the porosities of the ground in question, the ground surface deposition, contact sensor values and geo sample physical mechanics nature, and the change of the pressed porosities. The paper holds that the instantaneous peak pressure value of the saturated earth after the blasting is very great and holds for a long time, as long as three day sustained draining and consolidation. The ground surface swiftly sink after the blasting. The level of sinking is greater in the case of popping blasts than that in one blast. The contact sensor test and the earth sample physical mechanics test before and after the blasting indicate that the ground layer intensity has increased and the bearing capacity has also increased by 20%. The blasting porosities have increased by 9 times. Test proves the deep blasting method used to treat the soft ground is effective and successful.