【文章內(nèi)容簡介】
oefficient of this project is level 1, take )。 is the tensile working conditions coefficient of anchor bar ( permanent anchor take , temporary anchor take )。 is the tensile strength design value of anchor bar(standard value=400, design value=360).According to the calculation, ,choose level 3 steel of 128mm, =.(4)The calculation of anchorage body and rock mass anchoring lengthanchoring length should not only meet the requirements which the bond force of formation on mortar and the bond stress of mortar on steel, but also meet the requirements that the Structure design codes the Minimum anchoring length. (4)In the formula: is the anchoring length。 D is the diameter of anchorage body。 is the bond strength eigenvalue of layer and anchorage body, through the experiment or local experience sure, or according to the standard to selection ( this engineering’s rock mass uniaxial pressive strength is , belong to soft rock, rock mass structural plane development, take 300)。is the bond working conditions coefficient of anchorage body and layer (permanent anchor take ). According to the calculation, , take=.(5)The anchoring length between anchor steel and anchor mortar (5)In the formula: is the anchoring length between steel and mortar。 d is the diameter of anchor bar。 n is the number of steel。 is the bond strength design value between steel and anchor mortar, through the experiment sure, or according to the standard take 。 is the working conditions coefficient of steel and mortar bond strength(permanent anchor take ). According to the calculation, ,take =. The construction technology and key points of anchor The anchor’s construction technology is as follows: buildup scaffold——excavate and clear up the slope surface——measures to fix position——drill hole——washing hole——bolt put in a certain place——grout——colligation the end of the anchor——flushing the slope surface——pouring frame space——Spray seed(1)This slope belong to rocky slope, after excavate the slope 10 cm to the underside of the frame space, set bolt and pouring frame space, then spray grass