BFRP筋锚杆土质边坡支护应用研究

LABORATORY AND FIELD TESTS USE OF BFRP ANCHOR BOLT IN SUPPORTING SOIL SLOPE

论文通过拉伸试验、抗剪试验、耐腐蚀试验、与水泥基黏结强度试验,研究了BFRP筋力学性能,表明BFRP筋抗拉强度大于890MPa,耐酸碱强度保留率大于92%,抗剪强度略小于普通钢筋,与水泥基类黏结强度大于4.5MPa。参照《岩土锚杆(索)技术规程》(CECS 22:2005),结合BFRP力学性能参数,对BFRP锚杆支护土质边坡进行设计。BFRP筋作为锚杆,其抗拉强度设计值取750MPa,与砂浆黏结强度取2.0MPa。通过BFRP筋材和钢筋锚杆加固土坡的现场对比试验,分析了BFRP锚杆加固土质边坡的效果,表明两种锚杆受力和边坡变形类似,验证了BFRP筋作为岩土支护锚杆的适用性。

The mechanical properties of BFRP bar are studied by tensile test, shearing test, corrosion resistance test and bond strength test with cement-based materials. The result shows the following results. The tensile strength of BFRP is greater than 890MPa. The retention rate of acid and alkali resistance is greater than 92%.The shear strength is slightly smaller than that of ordinary steel bar. The bond strength of cement-based materials is greater than 4.5MPa. Referencing to the ＂Technical specification for grout anchors＂（CECS 22：2005）,the BFRP anchor bolts supporting soil slope are designed with BFRP mechanical performance parameters. While the BFRP bar is designed as anchor bolt, the design value of tensile strength of BFRP is 750MPa, and the bond strength of BFRP with mortar is 2.0MPa. Through in-situ comparing test of BFRP anchor bolts and steel anchor bolts supporting soil slope, the effect of BFRP anchor reinforcement on soil slope is analyzed. The results show that it is similar in bolt stress and slope deformation with BFRP bolt and steel bolt. The applicability of BFRP bar as geotechnical supporting anchor bolt is verified.