TRD工法在北方地区的适用性分析

ANALYSIS ON APPLICABILITY OF TRD METHOD IN NORTH OF CHINA

TRD工法在东南沿海、沿江地区应用较多,适用地质条件一般为软土地层.但也可以适用于标贯值不大于100击的软、硬质土层,中粗砂质土层,还可在颗粒直径小于100mm的卵砾石层和全风化及强风化软岩中施工.北方地区应用较少,经验数据和可以借鉴的案例不多.工程位于北京市通州区,北侧距离北运河210m,地下水位较高.综合考虑工期和成本,选用TRD工法止水帷幕.根据以往的施工经验及行业规范要求,TRD止水帷幕施工前需要先做试验.通过试验验证并总结了TRD工法在本地区的可行性.

TRD method is widely used in the southeast coastal and riverside areas,and the applicable geological conditions are generally soft soil layer.However,it can also be applied to soft and hard soil layer with SPT value no more than 100 blows,medium coarse sandy soil layer,and construction in gravel layer with particle diameter less than 100 mm and completely weathered and strongly weathered soft rock.In the northern region,there are few applications,empirical data and cases that can be used for reference.The project is located in Tongzhou District,Beijing,210m away from the North Canal in the north,with a high groundwater level.Considering the construction period and cost comprehensively,TRD construction method is selected as water stop curtain.According to the previous construction experience and the requirements of industry specifications,TRD water stop curtain needs to be tested before construction.The feasibility of TRD method in this area is verified and summarized through experiments.