排水型石笼生态袋阶梯跌水沟头防护方案

对于坡降(jiang)较(jiao)大(da)、地势落差(cha)较(jiao)大(da)、周(zhou)围(wei)植被较(jiao)差(cha)、上游(you)汇(hui)水面积(ji)较(jiao)大(da)、侵蚀破坏严(yan)重且难以遏制(zhi)的沟(gou)头，采取排水型(xing)石笼生(sheng)态袋阶梯跌水沟(gou)头防护形(xing)式。

石笼生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)阶梯(ti)跌水沟头防护(hu)包(bao)括进(jin)口段(duan)(duan)、缓坡段(duan)(duan)及(ji)消能段(duan)(duan)。各段(duan)(duan)长(zhang)度比例(li)一(yi)般(ban)为(wei)(wei)1∶3.3∶1.5。沟头从(cong)中心线(xian)向(xiang)两侧依次布(bu)设石笼网(wang)箱，末(mo)端与周围土体连接处布(bu)设生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)网(wang)箱，生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)网(wang)箱应嵌(qian)入土体0.5m，生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)网(wang)箱填(tian)充规格(ge)为(wei)(wei)0.6m×0.3m×0.15m的生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)，生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)中装生(sheng)(sheng)(sheng)态(tai)(tai)土及(ji)适应性(xing)草(cao)籽，生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)具有(you)透(tou)水、透(tou)气、强度高及(ji)可(ke)降解的优点，生(sheng)(sheng)(sheng)态(tai)(tai)草(cao)籽生(sheng)(sheng)(sheng)长(zhang)后可(ke)穿破生(sheng)(sheng)(sheng)态(tai)(tai)袋(dai)自然生(sheng)(sheng)(sheng)长(zhang)，与周围土体无(wu)(wu)缝衔(xian)接。石笼网(wang)内(nei)用(yong)块(kuai)石填(tian)充，网(wang)箱孔隙(xi)率(lv)不(bu)大于(yu)30%，单个网(wang)箱规格(ge)为(wei)(wei)1m×1m×(0.5m/1m)，网(wang)箱设计采(cai)用(yong)12号宾格(ge)网(wang)，为(wei)(wei)镀(du)锌材质，格(ge)眼尺寸8～12cm。沟头防护(hu)底部整(zheng)体铺设400g/m2无(wu)(wu)纺(fang)布(bu)进(jin)行反滤。