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Slope Stabilization Techniques SEEDING GEOSYNTHETICS PAVERS BLANKETS & MATS THE JOURNAL FOR EROSION & SEDIMENT CONTROL PROFESSIONALS EROSIONCONTROL.COM MARCH/APRIL 2019 Stabilization Techniques Highway 395 in California Safety First: Slope Stabilization Techniques BY LINDA ROBINSON CALTRANS rofessionals who work with To use this information to provide and collaborations with the Mono soil erosion control are a design height recommendation for a Lake Committee. In the 2015 remedy, accustomed to using the protective fence, the Rockfall Catch- Caltrans planned to use an anchored Revised Universal Soil Loss ment Area Design Guideline (RCADG) mesh to help prevent falling rock from Equation (RUSTLE2) to and the Ritchie Criteria are then used. landing in the traffic corridor. Pdetermine erosivity, erodibility, and land Engineers at Yeh and Associates “This was a traffic safety project use. What began as an equation method used these equations to help the Cali- by Caltrans,” explains Joe Blommer, became an enhanced database for sci- fornia Department of Transportation resident engineer with Caltrans. “The entists that includes the results of those (Caltrans) design a suitable rockfall wind just blew everything down onto equations to help determine soil loss and safety fence. The Marina Lake Fire had the road. But as we were gearing up techniques for soil conservation. pressed Caltrans into an emergency for 2016—one week before work was Engineers who work in the field of situation. Geobrugg was able to modify to begin—the fire came up. The fire slope and rockfall management use fence elements and deliver them in a burned up to the 10,000-foot elevation, potential energy equations to calculate timely manner to keep Highway 395 in and then the rocks really fell. We had a how much energy might result from southern California open to motorists. 10-ton boulder come down.” rocks and debris falling from hill- Caltrans monitors Highway 395 sides. From that, they can calculate the Working Together to Provide at Mono Lake north of Lee Vining strength of the materials to be installed Road Safety in Mono County, CA. Mono Lake is to protect the public from the rockfalls. When Caltrans proposed two phases considered to be one of the oldest lakes The potential energy equation is P.E. of a motorist safety project along a in North America. Blommer describes = mgh (where m = mass of rock, g = 1-mile section of Highway 395, agree- the route as a critical north-south gravitation acceleration, and h = vertical ment required more than three years of corridor for tourists, commuters, and height of rock). meetings, in-depth analysis and testing, property owners traveling between San 36 EROSION CONTROL WWW.EROSIONCONTROL.COM Bernardino and northern California. along the fog line and to the The transportation corridor on the east pavement in the roadway. side of the Sierra Nevada mountains Caltrans reported that a affords access to Yosemite National rockfall had spalled concrete Park, Mammoth Mountain ski area, from the upper part of the and southern California vicinities. rails and moved over into the Near Mono Lake, the highway highway lanes. narrows to two lanes, making safety Yeh and Associates rec- projects of paramount importance. For ommended that Geobrugg Highway 395 Caltrans, these safety projects had no modify and install its GBE- in California alternative. The $5.8 million project 500 A-R system in two areas CALTRANS was funded through the State Highway along 3,500 linear feet of the Operation and Protection Program. highway to mitigate any increased risk no way of knowing where it was.” The majority of transportation funding of rockfall. However, a challenge arose The answer, he said was a “floating” for Caltrans is provided by federal and that complicated typical installation of one-of-a-kind foundation. state fuel taxes. the temporary flexible rockfall fence: Geobrugg’s focus is on high-tensile A raging fire that began June 24, fiber-optic cable was located in the area steel wire systems used for rockfall 2016, started near an old marina on of the installation. mitigation, landslides, and avalanche Mono Lake and became known as the Geobrugg’s regional manager, Saleh and debris flow. The global company, Marina Lake Fire. Before its contain- Feidi, explains why a typical installa- based in Switzerland, has branches and ment July 7, it devastated 654 acres, tion was not possible. “The GBE-500 is partners in over 50 countries. mostly steep hillsides. Along Highway an all-encompassing system, with posts, The Forest Service had requested that 395 from mile posts 53.2 to 53.7, six cut cables, anchors, and the mesh fence. any temporary mitigation have a five- slopes were the focus of the Caltrans But we couldn’t pour any concrete year service life and that efforts include two-phased rockfall mitigation project. foundation because the fiber optic runs revegetation. In making their recom- Phase 1 had been completed before the all under the area. Depths were any- mendations, Yeh engineers used the fire, but post-fire stripping of vegeta- where from 5 feet to 15 feet, so we had potential energy equations to determine tion at the higher elevations, outside the Caltrans right of way, produced rockfall events that led to the need for emer- gency rapid mitigation of increased rockfall threats. Needless to say, phase 2 was temporarily suspended. FILTER UNIT “The contractors [Geobrugg] were already mobilizing, and we just kept Rock-Filled Mesh Sacks them,” says Blommer. Yeh and Associates, an engineering firm in Grover Beach, did an onsite field investigation on July 19 and 20, 2016. Evaluating the site for rockfall conditions included the geologists interviewing construction and mainte- nance personnel along the roadway to obtain their verbal eyewitness accounts of rockfall activity post-fire. Walking s!LTERNATIVETORIPRAPANDGABIONS the site, the engineers documented s1UICKANDCOST EFFECTIVEINSTALLATION s.OSITEPREPREQUIREDs3UPPORTSREVEGETATION conditions and measured slope angles s$URABLE YEARSERVICELIFE and catchment widths. s YEARTRACKRECORD Caltrans had installed K-rails, s/VER UNITSINSTALLED the white concrete barriers, to keep WORLDWIDE cars from veering into the previously installed mesh wire fence from phase 1, says Blommer. K-rails are usually www.kyowa-filterunit.com installed as an immediate response to a rockfall event. Marubeni America Corp. (Master Distributor, North America) Engineering geologists from Yeh Contact: Masanaga Kato observed rockfall impact to the K-rails Tel: 212-450-0320 E-mail: [email protected] MARCH/APRIL 2019 EROSION CONTROL 37 the flexible rockfall fence’s energy rating and height. After Olympic Park studying the natural slopes above the highway, they used slope training facility heights and geometries to determine maximum vertical height in Utah for the potential rockfall to hit the road. The vertical height was estimated at 200 feet. Using that, they calculated maximum potential energy of rockfall from the 200-foot vertical height PARK SNOWBOARD AND SKI OLYMPIC UTAH impacting the flexible rockfall fencing. Using data col- lected about the size of boulders observed in the most recent rock- fall, the weight of the boulders that could potentially hit the fence was estimated to be 1,500 pounds. Although the maxi- mum potential energy was calculated for a 500-kJ rockfall fence, the maximum kinetic energy actually hitting the fence would be much less. Blommer explains that the soils in the slopes are very soft, and in some places the slopes level off. In addi- tion, taking into account the trees in the area, the rocks would lose energy when traveling down the soft embankments; rolling along flat surfaces and hitting began delivering posts trees and vegetation slows their velocity. to the site. By August Geobrugg installed 2,000 linear feet 5, 2016, the posts had of 10-foot fence at the southern end been installed. 57 posts, of the project. In the steeper northern spaced 30 feet apart, areas, 13-foot-high fencing was installed were put in and more along 1,500 linear feet of the highway. than 700 linear feet of Working around the two constraints #3 TECCO mesh fence of the project—emergency time factors and the buried fiber was hung. The $2.2 million Marina Lake Fire Emergency optic cable—the engineers collaborated with Geobrugg to help Project also included repairing guardrails. modify the GBE-series rockfall fence to optimize its function- Blommer says that in May, the area had experienced ality and ensure installation in a timely manner at the site. rockfall that originated from as far as the top of the hillside. To modify the rockfall fence, the Geobrugg engineers “In 2016, they put up the 500-kJ 10-foot and 13-foot fences. took the GBE A, with its basic hinged post and a base plate In 2018, we had another rockfall event; a 300-foot section got supported by upslope and lateral wire ropes, and the GBE destroyed. So under another emergency contract, that was A-R, with a braced post design but no support ropes, and removed, and we put in a 1,000-kJ fence,” he explains. came up with the A-R Modified. The GBE A-R Modified “The Forest Service study said it was a five-year plan to uses a global support to accommodate the post base support stabilize that area, and we’re three years into it now. We’ll be (from the original A-R) with wire ropes and upslope and lat- having an evaluation again. Caltrans geotechnical personnel eral support wire ropes (from A). Because the purpose of the and the Forest Service will come together on that one.” new design was to prevent the post from “kicking out” upon The ultimate goal is to stabilize and revegetate the six impact from the rockfall, the post’s wire rope is attached to eroded slopes.
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