h形支挡结构的试验研究  

Experimental investigation on h-type retaining structure

作　　者：熊传祥[1] 张满 陈誉 Xiong Chuanxiang;Zhang Man;Chen Yu(Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福州大学,福建福州350116

出　　处：《土木工程学报》2022年第7期108-120,共13页China Civil Engineering Journal

摘　　要：h形支挡结构较常规抗滑桩不仅在抗弯刚度上具有明显优势,还能严格地控制桩顶位移。目前针对h形支挡结构支护的相关研究较少,为此进行了模型试验研究,分析前后桩排距B及前桩桩长L这两个主要参数对h形支挡结构的桩顶位移、桩身弯矩、土压力及破坏模式的影响。研究表明,一定范围内增大前后桩排距B或前桩桩长L都能减少桩顶水平位移;桩身弯矩最大值位于连系梁与后排桩连接处附近,且随前后桩排距B增大而增大,随前桩桩长L增大而减小;开挖完成后后排桩桩后土压力接近于朗肯主动土压力;后排桩桩前土压力接近于静止土压力;前排桩桩后土压力在前后桩排距B较大时接近于朗肯主动土压力,而在排距B较小时接近于静止土压力;前排桩桩前土压力由静止土压力向朗肯被动土压力发展,分布为三角形加倒三角形组合分布模式。在前后桩排距B及前桩桩长L影响下,h形支挡结构支护存在“V”字和“W”字两种破坏模式。研究结果可以为工程设计提供参考,同时为理论分析模型建立提供依据。The h-type retaining structure is superior to the conventional slope stabilizing pile not only in its bending rigidity but also in its capability of strictly controlling the displacement of the pile top.However,there have been few researches on the h-type retaining structure.Hence,a physical model test was designed to study the effects of two main parameters,namely the spacing B of the front pile row and the rear pile row and the length Lof front pile,on the pile top displacement,bending moment of pile shaft,earth pressure and failure mode of the h-type retaining structure.Research results show that by increasing the spacing B of the front pile row and the rear pile row or increasing the length Lof front pile within a certain range,the horizontal displacement of the pile top can be reduced.The maximum bending moment of pile shaft is located near the connection between the connecting beam and the rear row of piles,and it may increase with the increase of the spacing B,but decrease with the increase of L.After the excavation is completed,the earth pressure in front of the rear pile row is close to the at-rest earth pressure;when the spacing B is large,the earth pressure behind the front pile row is close to the active earth pressure of Rankine,but when the spacing B is small the earth pressure behind the front pile row is close to the at-rest earth pressure of Rankine;the earth pressure in front of the front pile may develop from the at-rest earth pressure to the Rankine passive earth pressure,and the distribution is composed of a triangle and a inverted triangle.Affected by the spacing B and the length Lof front pile,the h-type retaining structure may fail in the mode of“V”or“W”.These results can be referred to in engineering design and establishment of theoretical model.

关 键 词：h形支挡结构 桩顶位移 桩身弯矩 土压力 破坏模式 

分 类 号：TU43[建筑科学—岩土工程]