主动减压超前支护结构关键问题分析  

Analysis on key problems of initiative decompression pre-reinforced structure

作　　者：王培勇[1] 刘元雪[1] 冉仕平 张正波 

机构地区：[1]后勤工程学院,军事建筑工程系,重庆401331 [2]西藏自治区交通厅,西藏拉萨850000

出　　处：《重庆大学学报（自然科学版）》2011年第3期126-131,共6页Journal of Chongqing University

基　　金：国家自然科学基金(50979112);重庆市自然科学基金项目资助(2008BB6144)

摘　　要：针对边坡工程中超前支护结构未充分发挥岩土体自身抗剪能力的问题,通过对支护结构与边坡体耦合作用机理的分析,提出了一种主动减压超前支护结构型式,主要由柔性填料和超前支护结构组成。柔性填料的设置和厚度是主动减压超前支护结构设计的两个关键问题。一方面,柔性填料的设置在支护施工时要保证主动减压超前支护结构两个组成部分互不影响;另一方面,柔性填料的设计厚度要能保证边坡岩土体充分发挥自身抗剪能力,使得边坡体下滑推力由目前超前支护结构独自承担向超前支护结构和岩土体共同承担转变,此时超前支护结构承受的推力最小,从而达到主动减压的效果。最后以工程实例说明了柔性填料厚度的计算过程,得到了比较合理的计算结果。In slope engineering,the shear resistance of rock and soil can never be exerted themselves by general pre-reinforced structure,through the coupling mechanism between reinforced structure and slope,an initiative decompression pre-reinforced structure consists of soft stuffing and pre-reinforced structure is presented.The setting and thickness of soft stuffing are both key questions during the design of initiative decompression pre-reinforced structure.On one hand,the setting of soft stuffing assure that parts of initiative decompression pre-reinforced structure cannot interact each other under reinforcing;on the other hand,the thickness of soft stuffing can assure that the shear resistance of rock and soil can be exerted by themselves,the sliding thrust which is endured by pre-reinforced structure alone is changed to be endured by soil and pre-reinforced structure together.Then the sliding thrust endured by pre-reinforced structure minimizes,accordingly the effect of initiative decompression is achieved.In the end,the calculation procedure of thickness is illustrated by a practical project and the result is rational.

关 键 词：边坡工程 主动减压 柔性填料 超前支护 应变软化 施工 

分 类 号：TU37[建筑科学—结构工程]