真空预压中设置应力释放沟的现场

在总结真空预压工程中水平位移理论研究和现场测试资料的基础上，引入了应力释放沟。结合实际工程中设置应力释放沟情况下加固区外水平位移和附加沉降的测试，认为水平位移影响范围在加固区外27.5m以内，附加沉降的影响范围至少在加固区外27.5m。通过一般加固区外，打设水泥搅拌桩以及设置应力释放沟三种边界情况下现场实测数据的对比分析，认为设置应力释放沟可以大大减少加固区外的水平位移和附加沉降，起到一定的隔离作用，从而减小了真空预压对周围环境的影响。

Field Experiment and Analysis of Vacuum-Preloading Stress-Release Ditch

Based on summary of theoretical research of horizontal displacement and field experiment data in the vacuum preloading project, the concept of stress release ditch is introduced. Incorporated with test of horizontal displacement and subsequent settlement outside strengthening area in actual project that has been set stress release ditch, it is concluded that the influenced area of horizontal displacement and subsequent settlement extents to more than 27. 5m outside the strengthening area. It is proved that horizontal displacement and subsequent settlement outside the strengthening area could sharply decrease through comparative analysis of field test data under three kind of boundary conditions, i. e , the ordinary strengthening, installing cement mixing pile, and setting stress release ditch. Setting stress release ditch could also isolate and decrease the influence of vacuum preloading on the surrounding environment.