摘要
冻结法是通过厚表土井筒施工的有效方法，“冻实”和强化冻结是深厚粘土层冻结值得推荐的方案。实践证明，钻眼爆破法能够加快掘进速度。在保证冻结管安全条件下提高钻眼爆破效率，必须合理选择钻眼设备，优化冻土爆破参数，实现全断面一次爆破。
The traditional hydro-engineering gate containing bedding, gate body, step slope and power consumption et al . with a length of more than 60 m is usually suffered frost damage in cold regions. A new type of box-separated gate was designed and set up in 1985 with a discharge of 120 m 3/s, and spreaded widely in Northeast, Northwest and North China with a great deal of benefit for preventing frost damage. The performances of the gate are as follows: 1) The main body of the gate designed as bar shaped one, with a length of less than 20% of traditional one which might be affected by frost heaving; 2) All of the foundations is located at the same level covered by enough depth of water which is efficient for preventing frost penentration to their bottom and consquentely the normal frost heaving force under the foundation will surely reduce; 3) The sides of the box were set up as slopes which eliminate the tangential frost heaving force; 4) Box separated gate is affected by symmetrical horizontal frost heaving force which keeps the gate stabilized. The experience shows that the gate can be used in not only cold regions but also non-frost areas, saving a large amount of work and cost.
出处
《冰川冻土》
CSCD
北大核心
1997年第3期263-267,共5页
Journal of Glaciology and Geocryology
基金
煤炭工业资助
