复合土钉结合管井降水在软土基坑中的应用与研究

随着基坑支护技术的发展,软土场地采用土钉墙支护技术已相当普遍,采用木桩或水泥搅拌桩即复合土钉墙对坑底进行加固后,深度也越来越大,深度达7～8m,但采用土钉墙的软土基坑所发生的坍塌、滑移等安全事故屡见不鲜。以某基坑应用工程为实例,对复合土钉结合管井降水有关理论与经验进行探讨。实践证明,管井降水能明显改善有粘质粉土层的复合土钉的支护性能,同时减少对周围环境的沉降与位移影响,从而提高支护体的稳定性,节省支护工程成本。

APPLICATION AND RESEARCH ON COMPLEX SOIL NAILING WALL COMBINE TUBE WELL DRAIN IN SOFT SOIL FOUNDATION EXCAVATION

Along with the development of technology of retaining and protection for foundation excavation, the soil nailing wall technology is took at large in soft soil ground, and the depth become larger after reinforcing the bottom of foundation by tree peg or concrete milling peg, some the depth is 7-8 m,but the accident such as collapse and slippage are many on soft foundation by soil nailing. By a application foundation engineering, the article discuss the theory and experience about complex soil nailing combine tube well drain. Practice prove that the tube well drain can ameliorate the performance of retaining and protection in evidence when the complex soil nailing in viscid powdery soil, it also can reduce the infection on subside and displacement to the ambience, thereby enhance the stability of retaining and protection system, economize the expense of retaining and protection engineering.