土工格栅减小路堤支挡结构土压力的理论分析

A Theoretical Analysis of Geo-grids How to Decrease the Earth Pressure Acted on an Embankment Retaning Structure

研究目的:本文研究土工格栅减小路堤支挡结构土压力的工程技术,并探讨理论计算方法。研究方法:从力多边形出发,假定土工格栅同时发挥其抗拉强度,采用理论分析的方法进行土工格栅减小路堤支挡结构土压力的工程技术研究。研究结果:通过理论分析,获得了土工格栅减小路堤支挡结构土压力的理论计算方法。研究结论:本文提出的加设土工格栅路肩式桩板墙上破裂角与主动总土压力计算方法简单,具有较强的实用价值;对于较高的路肩式桩板墙可采用在填料中铺设土工格栅的方法减小土压力,进而减小桩身截面与挡土板厚度;填料宜采用不易风化的硬质岩石材料;土工格栅的铺设位置应在填方下偏中上部,具体应按其抗拉强度与破裂面内填料提供的摩擦阻力来确定;建议今后应在其布置、间距、变形特性等方面作进一步研究,使得实际与理论更相符合。

Research purposes： This paper researches the engineering technology for the geo - grids how to decrease the earth pressure acted on an embankment retaining structure and discusses the theoretical calculation method. Research methods：It is assumed from the forces polygon that the geo - grids develop their stretching strength at the same time and then a theoretical analysis method is used to analyze the engineering technology for the geo -grits how to decrease the earth pressure acted on an embankment retaining structure. Research results： The theoretical analysis has acquired a calculation method for the geo - grids how to decrease the earth pressure acted on an embankment retaining structure. Research conclnsions：The method put forward in this paper is simple and practical. It can be used for calculating the active breaking angle and the total active earth pressure on the embankment pile - slab wall with the geo - grids. For a high pile - slab wall, the earth pressure can be decreased by means of each layer of the fillings paved with each layer of geo -grids, then the pile section size and the slab thickness can be decreased. But the fillings shall be hard such as rock with less weathering; the geo - grids shall be positioned at the middle - upper below the fillings, the more details must be determined according to its stretching strength and the friction resistance provided by the earth fillings within the breaking sueface. Finally it is suggested that a further research must be performed of their arrangement, layer - distance and deformation characteristics etc. , to make the theory more conforming to match the practice.