Serving professionals in engineering, environmental, and groundwater geology
since 1957

March Meeting of the Southern California Chapter
Co-hosted by ASCE Geo-Institute,
with AEG and CalGeo

***Wednesday, March 8, 2017***

Download the Announcement

The deep mixing method increases the strength and decreases the compressibility of soft ground, and thereby improves stability and reduces settlement of embankments, including transportation embankments, MSE retaining walls, levees, and dams. Continuous shear panels oriented perpendicular to the embankment alignment are more efficient for stability than isolated columns because shear panels are not subject to the same type of bending failure that isolated columns can experience. Even when continuous shear panels are used, they must be designed to resist multiple failure modes. Furthermore, the strength of deep mixed ground is typically more variable than the strength of naturally occurring clay deposits. Variability can be rationally incorporated in design and specifications to permit economical and reliable application of the deep mixing method. This presentation outlines analysis and design procedures, QC/QA activities, and key specification provisions. Several example applications of deep mixing are discussed.

Please see below for meeting information including whom to RSVP.

Topic: ASCE-GI Cross USA Lecture
"Deep Mixing Method for Support of Embankments"

Speaker: George Filz, Ph.D., PE.
Professor of Civil Engineering at Virginia Tech

Location: Stevens Steakhouse
5332 Stevens Pl.
Commerce, CA 90040
(323) 723-9856

Date/Time: Wednesday, March 8, 2017
5:30pm - Social Hour
6:30pm - Dinner
7:30pm - Program

Cost: $45 per person with reservations in advance for AEG members,
$50 without reservations (at the door) and non-members,
Free for students with a valid student ID.

Reservations: Please note the on-line option to reserve your seat and pre-pay for the meeting attendance: Reservations and online payment possible at: Or email Darrin Hasham at: or call (909) 917-9195.

Please make reservations by e-mail prior to noon,
Tuesday, March 7th.

The deviation from AEG's normal meeting protocol for the Meeting cost and reservation procedure are a result of ASCE hosting this meeting.

The frequency, intensity, and areal extent of wildfires in the Western United States are increasing. Changes imposed on watersheds during and after burning result in a dramatic increase in debris-flow occurrence and magnitude, which in turn poses risks to human life and property, especially as the urban-wildland interface advances into mountainous areas. Flows can be initiated following wildfire by low intensity rainfall events, and they grow substantially in volume through channel scour while in transit. On average, flow volumes are 3-5 times larger immediately after wildfires, and the volume magnification effects linger for 1-3 years before the watershed recovers. Volume is difficult to predict accurately, but it can be estimated using multiple linear regression models that rely on GIS-friendly inputs such as area burned, rainfall totals, and watershed slope characteristics. A new probabilistic model has been shown to be more accurate and it relies on even fewer terms. Discharge rates and velocity are also difficult to predict, but reasonable ranges are given using databases of previous field measurements. Damming and avulsion of the flows make runout patterns unpredictable, but recent studies have helped to quantify the process.
Speaker Biography
George Filz is the Charles E. Via Professor of Civil Engineering at Virginia Tech, where he has been teaching and conducting research in geotechnical engineering for 27 years. Before this, he worked in private engineering practice for 8 years. His bachelor's and master's degrees are from Oregon State University, and his doctoral degree is from Virginia Tech. Professor Filz's teaching, research, and practice interests include foundation engineering, soil-structure interaction, ground improvement, and seepage barriers. He has been recognized with several awards from the American Society of Civil Engineers, including: the Middlebrooks Award, the Croes Medal, the Florida Project-of-the-Year Award, and the Wallace Hayward Baker Award. He is the 2016-2017 Cross-USA Lecturer for the ASCE Geo-Institute.